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Design and Comparison of Wastewater Treatment Plant Types (Activated Sludge and Membrane Bioreactor), Using GPS-X Simulation Program: Case Study of Tikrit WWTP (Middle Iraq)
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作者 Alaa Uldeen Athil Arif Mohamed Tarek Sorour Samia Ahmed Aly 《Journal of Environmental Protection》 2018年第6期636-651,共16页
Mathematical models and simulation are considered a powerful tool in engineering practice. Those tools are becoming increasingly used for the improvement of wastewater treatment plants design because the conceptual de... Mathematical models and simulation are considered a powerful tool in engineering practice. Those tools are becoming increasingly used for the improvement of wastewater treatment plants design because the conceptual design is complex and ill-defined. In this paper, three alternatives: 1) complete mix activated sludge without nitrogen removal (CAS);2) complete mix activated sludge with nitrogen removal (CAS-N) and;3) membrane bioreactor (MBR) processes were designed into two steps: first concept design to calculate the size of process units, then second implement modeling and simulation to improve the accuracy of the conceptual design. In brief, the treatment process design has been verified by using the activated sludge model No. 1 (ASM1) in GPS-X (v.7) simulation software. This application helps not only in sizing the treatment units but also in understanding the plant’s capacity. In the same time, it can assist in studying the future expansion works required for increased hydraulic and organic loadings. For this purpose, Tikrit WWTP was selected as a case study. The used model was validated by comparing the designed values of the plant and the modeling data. The verification of the obtained results from both hand calculations and the results of the program showed a good agreement. A significant difference in the volume of secondary treatment was obtained from design calculations, where the CAS without denitrification system was 9244 m3 (aerobic and secondary tanks), CAS with denitrification system was 11,324 m3 (anoxic, aerobic and secondary tanks) and for MBR system was 7468 m3 (anoxic, aerobic and immersed membrane tanks). From the obtained results point of view, it can be concluded that mathematical models can be considered as worthy tools to complement the established wastewater treatment plant design procedures. 展开更多
关键词 Activated sludge Membrane Bioreactor wastewater treatment wastewater treatment plant DESIGN Modeling and Simulation
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Levels and distributions of polychlorinated biphenyls in sewage sludge of urban wastewater treatment plants 被引量:15
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作者 GUO Li, ZHANG Bing, XIAO Ke, ZHANG Qinghua, ZHENG Minghui State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,Beijing 100085, China 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2009年第4期468-473,共6页
Concentrations of polychlorinated biphenyls (PCBs) have been measured in sewage sludge samples from 8 urban wastewater treatment plants in Beijing, China. The PCB congeners were analyzed by isotope dilution high res... Concentrations of polychlorinated biphenyls (PCBs) have been measured in sewage sludge samples from 8 urban wastewater treatment plants in Beijing, China. The PCB congeners were analyzed by isotope dilution high resolution gas chromatography/high resolution mass spectrometry method. The concentration of PCBs ranged from 65.6 to 157 ng/g dry weight (dw), with a mean value of 101 ng/g dw. The dioxin-like PCB WHO-TEQs (World Health Organization-Toxic Equivalents) of the sludge were lower than 1 pg /g dw. Consequently, all the concentrations of PCBs in sludge samples were below the upper limit for land application according to the Chinese legislation law for agriculture use. The PCB homologue profiles in sludge samples were dominated by tri-CBs and tetra- CBs. Similar distributions have been found in one of the Chinese PCB commercial products. The patterns of dioxin-like and indicator congeners observed in this study were quite similar in all samples. The predominant congener for dioxin-like and indicator PCBs were PCB-118 and PCB-28, respectively, while PCB-126 had the highest TEQ value. 展开更多
关键词 polychlorinated biphenyls wastewater treatment plant sewage sludge DISTRIBUTION
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Community analysis of ammonia-oxidizing bacteria in activated sludge of eight wastewater treatment systems 被引量:17
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作者 Xiaohui Wang Xianghua Wen +3 位作者 Craig Criddle George Wells Jie Zhang Yin Zhao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2010年第4期627-634,共8页
We investigated the communities of ammonia-oxidizing bacteria (AOB) in activated sludge collected from eight wastewater treatment systems using polymerase chain reaction (PCR) followed by terminal restriction frag... We investigated the communities of ammonia-oxidizing bacteria (AOB) in activated sludge collected from eight wastewater treatment systems using polymerase chain reaction (PCR) followed by terminal restriction fragment length polymorphism (T-RFLP), cloning, and sequencing of the α-subunit of the ammonia monooxygenase gene (amoA). The T-RFLP fingerprint analyses showed that different wastewater treatment systems harbored distinct AOB communities. However, there was no remarkable difference among the AOB T- RFLP profiles from different parts of the same system. The T-RFLP fingerprints showed that a full-scale wastewater treatment plant (WWTP) contained a larger number of dominant AOB species than a pilot-scale reactor. The source of influent affected the AOB community, and the WWTPs treating domestic wastewater contained a higher AOB diversity than those receiving mixed domestic and industrial wastewater. However, the AOB community structure was little affected by the treatment process in this study. Phylogenetic analysis of the cloned amoA genes clearly indicated that all the dominant AOB in the systems was closely related to Nitrosomonas spp. not to Nitrosospira spp. Members of the Nitrosomonas oligotropha and Nitrosomonas communis clusters were found in all samples, while members of Nitrosomonas europaea cluster occurred in some systems. 展开更多
关键词 activated sludge ammonia-oxidizing bacteria T-RFLP amoA gene wastewater treatment plant
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Advanced Treatment of Wastewater Treatment Plant Effluent by Using Biofilms on Filamentous Bamboo 被引量:3
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作者 SUN Jun-wei HE Zheng-guang +3 位作者 CAO Wen-ping LI Lei YAN Xiao-le JIA Sheng-yong 《Meteorological and Environmental Research》 CAS 2012年第8期40-42,52,共4页
[ Objective ] The study aimed at treating wastewater treatment plant (WWTP) effluent by using bio-film reactor with filamentous bamboo as bio-carrier. [ Method] With the aid of a continuous flow reactor, a bio-film ... [ Objective ] The study aimed at treating wastewater treatment plant (WWTP) effluent by using bio-film reactor with filamentous bamboo as bio-carrier. [ Method] With the aid of a continuous flow reactor, a bio-film reactor using filamentous bamboo as bio-carrier was used to treat WWTP effluent with low C/N ratio, and the removal effects of CODc,, TN (total nitrogen), and NO3--N in the wastewater were analyzed.[ Result ] The average removal rates of CODcr, TN, and NO3- -N reached 47.7%, 23.6% and 34.5% when the C/N ratio of influent was around 2. In addi- tion, a stable bio-film was formed very well in the secondary effluent with low C/N ratio and hardly degradable organic pollutants. The pollutants could be removed effectively because of the excellent surface characteristics and compositions of filamentous bamboo. [ Conclusion] The research provides a new method to treat WWTP effluent with low C/N ratio. 展开更多
关键词 Filamentous bamboo Bio-film process wastewater treatment plant wwtp effluent Low C/N ratio China
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Occurrences of Glucocorticoids in Aquatic Environment and Their Removal during Wastewater Treatment
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作者 吴清晨 吴世闵 +5 位作者 张茵茵 ANDERE Clement Miruka 朱大海 张艾 刘亚男 薛罡 《Journal of Donghua University(English Edition)》 CAS 2023年第3期293-318,共26页
Glucocorticoids(GCs) are a group of endocrine-disrupting compounds(EDCs) frequently prescribed against various medical conditions.Recently,GCs have been shown to be effective in managing septic shock in patients infec... Glucocorticoids(GCs) are a group of endocrine-disrupting compounds(EDCs) frequently prescribed against various medical conditions.Recently,GCs have been shown to be effective in managing septic shock in patients infected with the 2019 novel coronavirus(COVID-19).Due to colossal consumption and potential risks to aquatic organisms,GCs have immensely attracted the focus of the scientific research community as a water pollutant.Therefore,the aim of this paper is to review the current knowledge on the occurrence of various GCs in the aquatic environment and their removal during wastewater treatment.A variety of GCs are ubiquitous in surface water,hospital wastewater,and sewage water worldwide.And the minimum concentration in volume is below 0.01 ng/L,and the maximum one is 10 000 ng/L,and enter the environment through hospital and urban wastewater discharging.Compared with natural GCs,higher risks to aquatic environments could be induced by synthetic GCs.The current activated sludge processes used in wastewater treatment plants(WWTPs) are not fully effective in eliminating GCs,some of which may further increase the risk of GC in the environment.In comparison with the aerobic process in WWTPs,the anaerobic and anoxic processes were found to be more efficient for GC degradation.Of the studied GCs,fluticasone propionate,clobetasol propionate,fluocinolone acetonide,and triamcinolone acetonide need more attention due to their low removal efficiencies and strong toxicity.Among the advanced treatment processes,reverse osmosis,ultraviolet irradiation,CaO_(2),and plasma could achieve significant GC activity removal while micro/ultra-filtration,chlorination,and ozonation were less efficient. 展开更多
关键词 glucocorticoid(GC) endocrine disrupting compound(EDC) wastewater treatment plant(wwtp) advanced wastewater treatment
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The Effect of Wastewater Treatment Plants on Retainment of Plastic Microparticles to Enhance Water Quality—A Review 被引量:2
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作者 Rana Zeeshan Habib Ruwaya Al Kendi Thies Thiemann 《Journal of Environmental Protection》 2021年第3期161-195,共35页
Microplastics, plastic pieces of ≤5 mm in size, are ubiquitous in ther environment and can be found in both terrestrial and aquatic ecosystems. This manuscript reviews the literature on the fate of microplastics in w... Microplastics, plastic pieces of ≤5 mm in size, are ubiquitous in ther environment and can be found in both terrestrial and aquatic ecosystems. This manuscript reviews the literature on the fate of microplastics in wastewater treatment and briefly highlights novel developments in the removal of microplastics from aqueous systems. 展开更多
关键词 Microplastics Nanoplastics wastewater treatment plants sludge treatment Plastic Retainment
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Impact of wastewater treatment plant effluent discharge on the antibiotic resistome in downstream aquatic environments:a mini review 被引量:1
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作者 Zhiguo Su Lyujun Chen Donghui Wen 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2024年第3期131-141,共11页
Antimicrobial resistance(AMR)has emerged as a significant challenge in human health.Wastewater treatment plants(WWTPs),acting as a link between human activities and the environment,create ideal conditions for the sele... Antimicrobial resistance(AMR)has emerged as a significant challenge in human health.Wastewater treatment plants(WWTPs),acting as a link between human activities and the environment,create ideal conditions for the selection and spread of antibiotic resistance genes(ARGs)and antibioticresistant bacteria(ARB).Unfortunately,current treatment processes are ineffective in removing ARGs,resulting in the release of large quantities of ARB and ARGs into the aquatic environment through WWTP effluents.This,in turn,leads to their dispersion and potential transmission to human through water and the food chain.To safeguard human and environmental health,it is crucial to comprehend the mechanisms by which WWTP effluent discharge influences the distribution and diffusion of ARGs in downstream waterbodies.In this study,we examine the latest researches on the antibiotic resistome in various waterbodies that have been exposed to WWTP effluent,highlighting the key influencing mechanisms.Furthermore,recommendations for future research and management strategies to control the dissemination of ARGs from WWTPs to the environment are provided,with the aim to achieve the“One Health”objective. 展开更多
关键词 Antibiotic resistance genes(ARGs) wastewater treatment plants(wwtps) Effluent-receiving waterbodies Environmental risk Influencing mechanism
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Advances in Research of Characteristics and Removal of Microplastics in Sewage Treatment Plants 被引量:1
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作者 Shasha LIU Jianping FU Yue YANG 《Asian Agricultural Research》 2022年第11期41-47,共7页
Microplastic pollution has become a worldwide issue.The discharge of sewage treatment plants(STPs)or wastewater treatment plant(WWTPs)is an important way for microplastics to enter the environment.This study reviewed ... Microplastic pollution has become a worldwide issue.The discharge of sewage treatment plants(STPs)or wastewater treatment plant(WWTPs)is an important way for microplastics to enter the environment.This study reviewed the sources and occurrence characteristics(type,size,color and components)of microplastics in domestic and foreign sewage plants.It elaborated the removal principles of microplastics by primary,secondary and tertiary treatments.In addition,the removal effects of various treatment units and different processes on microplastics were summarized.In the future,the removal mechanism of microplastics in sewage treatment plants should be discussed in more depth,so as to further improve the removal rate of microplastics by optimizing and transforming traditional sewage treatment processes.Therefore,it is necessary to develop new technologies/processes specifically for the removal of microplastics and promote them to practical applications. 展开更多
关键词 Microplastics Sewage treatment plant(STP) wastewater treatment plant(wwtp) Occurrence characteristics REMOVAL
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Troubleshooting and Optimization of High-Strength Inhibitory Chemical Wastewater Treatment Process
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作者 严月根 Calvert C.Churn +2 位作者 何光辉 郑巧庚 Philip C.Y.Wong 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第6期800-808,共9页
Wastewaters from the chemical industry are usually of high-strength and may contain minor inhibitory and recalcitrant organics that are at times not readily identifiable. This paper describes the experience of a biolo... Wastewaters from the chemical industry are usually of high-strength and may contain minor inhibitory and recalcitrant organics that are at times not readily identifiable. This paper describes the experience of a biological waste water treatment plant (WWTP) processing a COD concentration of 43000 mg·L^-1 wastewater from an oxochemical manufacturing plant. Stage improvements of the plant process by dilution of the inhibitory influent using other chemical wastewater streams resulting in a synergistic process effect, and removal of inhibitory organics by phase separation via acidification, effectively achieved process optimization producing a high quality effluent. In particular, the COD removal efficiency of granular sludge based anaerobic reactors increased from 56% to 90%. The final effluent COD decreased from 250mg·L^-1 to 50mg·L^-1, consistently meeting the COD concentration of 100 mg·L^-1 regulatory discharge limit. The success of the process enhancements supports the hypothesis that long-chain quaternary carboxylic acids act as substrate inhibitors in the biological process. 展开更多
关键词 operational experience waste water treatment plant (WVCTP) granular sludge chemical wastewater INHIBITORY RECALCITRANT long-chain quaternary carboxylic acids
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Why Should We Bother on Measurement in Wastewater Treatment Operation?
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作者 Stig Morling 《Journal of Water Resource and Protection》 2016年第11期982-989,共9页
The question of wastewater treatment and control is reflected from a very specific viewpoint: the low priority given to accurate and useful measurements within wastewater treatment. The matter is discussed from four v... The question of wastewater treatment and control is reflected from a very specific viewpoint: the low priority given to accurate and useful measurements within wastewater treatment. The matter is discussed from four various perspectives, that may be labelled “Legal understanding”;“Needs for accurate measurement results already in the planning and design stage”;“The measurement problem and human behaviour”;“The understanding of the short term and long term dynamics and changes in pollution and flow loads on a wastewater treatment plant (WWTP)”. All these aspects bring about much improved needs for an accurate and frequent measurement scheme both for pollutants and flows entering a WWTP. The conclusion is stated as follows: A far more and well elaborated on-line measurement system at the plants would become a needed tool for improved water environment protection at lower costs. 展开更多
关键词 MEASUREMENT Legal Issues On-Line Instruments Nitrogen sludge Systems wwtp (wastewater treatment plant)
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Full scale application of combined SBF-AS process for municipal wastewater treatment in small towns and cities in China
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作者 刘硕 王宝贞 +2 位作者 王琳 丁永伟 周宏均 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2006年第3期347-353,共7页
The combined submerged biofilm ( SBF)-activated sludge (AS) process for treatment of municipal wastewater in a small city in China is described in this paper. The process exhibited high removal efficiencies for ca... The combined submerged biofilm ( SBF)-activated sludge (AS) process for treatment of municipal wastewater in a small city in China is described in this paper. The process exhibited high removal efficiencies for carbonaceous substances, nitrogen and phosphorus which mainly took place in the combined SBF-AS biore- actor. The SBF-AS bioreactor was divided into pre-anoxic, anaerobic, anoxic and aerobic zones from inlet to outlet, in which fixed biofilm carriers were packed. Excellent performance had been obtained under normal operating conditions in more than one year of operation in Dong' e municipal WWTP, Shandong province, with mean removal efficiencies of BOD5 93.4%, COD 88%, SS 92%, NH4 - N 82. 1%, TP 75% and TN 66.7%, and quite high effluent quality such as BOD5 6 to 10 rag/L, COD 20 to 40 rag/L, SS 5 to 10 rag/L, TN 10 to 20 rag/L, NH4 - N 4 to 8 mg/L and TP 0. 6 to 1.0 mg/L. The effluent was reused multi-purposely, such as toilet flushing, green belt watering and artificial lake pounding. Simultaneous nitrification and denitrification took place due to the DO gradient in biofilm in aerobic zone of the SBF-AS bioreactor, which made TN removal efficiency improved remarkably in system. Some activated sludge was returned from final clarifiers to the bioreactor for phosphorus removal. The process had the advantages of low investment and low operational/ maintenance (O/M) costs, low sludge yield and was preferably employed in small towns and cities. 展开更多
关键词 wastewater treatment plant wwtp in small cities and towns combined submerged biofilm-activated sludge (SBF-AS) process simultaneous nitrification and denitrification (SND) DO gradient phosphor-us removal
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我国城镇污水处理厂污泥产率系数现状及影响因素分析
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作者 陈敏敏 刘杰 +3 位作者 李莉娜 邱立莉 杨伟伟 敬红 《工业水处理》 CAS CSCD 北大核心 2024年第3期24-29,共6页
以我国城镇污水处理厂生态环境统计和监测数据为基础,分析了我国城镇污水处理厂经验污泥产率系数(YQ)和以去除COD导致的污泥增殖来计算的污泥产率系数(YCOD),研究了进水COD、设计处理规模、处理工艺、区域分布等单一因素以及多因素与污... 以我国城镇污水处理厂生态环境统计和监测数据为基础,分析了我国城镇污水处理厂经验污泥产率系数(YQ)和以去除COD导致的污泥增殖来计算的污泥产率系数(YCOD),研究了进水COD、设计处理规模、处理工艺、区域分布等单一因素以及多因素与污泥产率系数的响应关系。结果表明,我国城镇污水处理厂YQ平均值为1.33×10-4 t/m3,YCOD平均值为0.81 kg/kg,YQ、YCOD总体呈正偏态分布;YQ平均值与进水COD、设计处理规模正相关,YCOD平均值与进水COD、设计处理规模负相关;YQ、YCOD平均值对应的COD区间范围为150~250 mg/L,设计处理规模为1×104~1×105 m3/d的污水处理厂YQ、YCOD与平均值最为接近,相对偏差分别为2.8%、-4.3%;A2/O工艺、氧化沟类、普通活性污泥法、A/O工艺的YQ、YCOD与平均值接近,相对偏差范围分别为-1.8%~1.9%、-2.3%~5.8%;华东和华中地区的YQ,华东、西南地区YCOD与平均值基本持平;多因素方差分析显示进水COD为YQ和YCOD的显著影响因素。 展开更多
关键词 城镇污水处理厂 污泥产率系数 影响因素 多因素方差分析
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深圳沙河水质净化厂及3#调蓄池工艺设计要点及特点
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作者 黄文章 王子龙 《净水技术》 CAS 2024年第6期169-178,共10页
沙河水质净化厂设计规模为旱季10万m^(3)/d,雨季额外处理10万m^(3)/d初期雨水,3#调蓄池设计规模为15.3万m^(3)。污水及初期雨水处理采用预处理+多段厌氧-好氧(AO)+二沉池+磁混凝高效沉淀池+精密过滤+紫外消毒的工艺,出水水质执行深圳市... 沙河水质净化厂设计规模为旱季10万m^(3)/d,雨季额外处理10万m^(3)/d初期雨水,3#调蓄池设计规模为15.3万m^(3)。污水及初期雨水处理采用预处理+多段厌氧-好氧(AO)+二沉池+磁混凝高效沉淀池+精密过滤+紫外消毒的工艺,出水水质执行深圳市地方标准《水质净化厂出水水质规范》(DB 4403/T 64—2020)B级标准,其中总氮(TN)≤8 mg/L。污泥处理采用离心浓缩+低温热干化工艺,处理后含水率≤40%。作为国内首个将水质净化厂与初期雨水调蓄池深度融合的全地下式水污染治理综合体,项目采用多段AO耦合“3W法”(Wet-Weather-Wastewater法),并以此为核心提出了一种实现大规模污水及初期雨水高标准协同处理的系统解决方案,且无需大幅度增加污水处理设施体量、投资和运行成本。 展开更多
关键词 地下式水质净化厂 3#调蓄池 水污染治理综合体 协同处理 多段AO “3W法”
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污水处理厂中典型肠道病毒的分布与检测方法及其风险评估 被引量:1
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作者 陈江峰 詹咏 +3 位作者 钱康 陈祥 李锟 董滨 《净水技术》 CAS 2024年第2期27-38,118,共13页
新冠肺炎威胁了全球经济和公众健康,其在粪便和污水中的检出表明了存在粪口传播的可能性。污水在城市污水处理系统中来源广泛,是水传播病毒的重要途径。为进一步开展污水处理设施中病毒的相关研究工作,文中分析了污水处理系统中典型肠... 新冠肺炎威胁了全球经济和公众健康,其在粪便和污水中的检出表明了存在粪口传播的可能性。污水在城市污水处理系统中来源广泛,是水传播病毒的重要途径。为进一步开展污水处理设施中病毒的相关研究工作,文中分析了污水处理系统中典型肠道病毒的定量分布现状,总结了污水处理流程中病毒的灭活机制,并对国内外污水处理厂的肠道病毒研究进展进行归纳。此外,梳理了污水处理厂样本中典型肠道病毒的浓缩及检测方法,最后结合定量微生物风险评价(quantitative microbial risk assessment,QMRA)分析方法,讨论了病毒的浓度、感染概率及其潜在的健康风险。研究对国内病毒排放标准和风险评价体系的建立进行了探讨,为实现污水处理厂肠道病毒全过程风险管理和后续处理处置相关规范的制定提供参考和理论支撑。 展开更多
关键词 肠道病毒 分布特征 检测方法 风险评估 污水处理厂
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纯膜MBBR+磁混凝沉淀工艺在广东省某城市污水厂提标改造中的应用 被引量:1
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作者 李鹏飞 韩建博 +1 位作者 顾凤 周波 《净水技术》 CAS 2024年第3期166-173,共8页
广东省某城市污水处理厂于2003年建成并投入运营,该污水处理厂原工艺为“厌氧UASB+高负荷生物滤池+固体接触池+生物絮凝沉淀池”,随着污水排放标准的不断提升,该污水处理厂提标改造工作迫在眉睫。经过对多种工艺综合比选,确定将原工艺... 广东省某城市污水处理厂于2003年建成并投入运营,该污水处理厂原工艺为“厌氧UASB+高负荷生物滤池+固体接触池+生物絮凝沉淀池”,随着污水排放标准的不断提升,该污水处理厂提标改造工作迫在眉睫。经过对多种工艺综合比选,确定将原工艺提标改造为“纯膜MBBR+磁混凝沉淀”,对提标改造工程开展工程设计,剖析提标改造后污水处理厂的运行效果。结果表明:以“纯膜MBBR+磁混凝沉淀”为主体的提标改造工艺优势显著,可节省面积约为2600 m^(2),提标改造后污水处理厂能够连续稳定运行,出水水质满足《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准和《水污染物排放限值》(DB 44/26—2001)第二时段一级标准的较严值。 展开更多
关键词 城市污水厂 提标改造 纯膜 MBBR 磁混凝 工程化应用
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Total concentrations and different fractions of heavy metals in sewage sludge from Guangzhou, China 被引量:7
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作者 刘敬勇 孙水裕 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第8期2397-2407,共11页
Dewatered municipal sludge samples were collected from five municipal wastewater treatment plants (WWTPs) and one industrial WWTP in Guangzhou, China. A number of agricultural parameters and total metal concentratio... Dewatered municipal sludge samples were collected from five municipal wastewater treatment plants (WWTPs) and one industrial WWTP in Guangzhou, China. A number of agricultural parameters and total metal concentrations in the sludge were determined. Metal speciation was also studied. The results showed that sewage sludge had high organic carbon, and was rich in such nutrients as N and P. The concentrations of Mn, Zn, and Cu were the highest, followed by Ni, Pb, and Cr, Cd had the lowest concentration. In addition, the concentrations of the aforementioned heavy metals in the sludge samples were higher than those recorded in the background data for crop soils. With the exception of Cu and Cd from site S1, and Ni from sites S1, $2, and $5, all other metal concentrations conformed to permissible levels prescribed by the national application standard of acid soil in China (GB 18918--2002). The results of the BCR sequential extraction showed that the concentrations of Mn and Zn were predominant in acid-soluble/exchangeable and reducible fractions. Cu was principally distributed in oxidizable and residual fractions, whereas Cr was present in oxidizable and residual fractions, Pb was found in the state of residual fractions, and the distribution of Ni and Cd did not show significant characteristics. 展开更多
关键词 sewage sludge heavy metals metal fraction sequential extraction wastewater treatment plant wwtp
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超薄玻璃基板深加工项目生产废水预处理工程设计
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作者 程炜 章婷婷 +1 位作者 慕昕志 朱倩倩 《净水技术》 CAS 2024年第4期169-177,共9页
某废水处理工程建设规模为17800 m^(3)/d,文中介绍了该处理工程的概况、工艺流程以及主要构筑物的工艺设计。工程预计进水组成中,工业废水占有相当的比例,主要以电子废水为主。为解决废水可生化性较差、污水处理难度较大的问题,预处理... 某废水处理工程建设规模为17800 m^(3)/d,文中介绍了该处理工程的概况、工艺流程以及主要构筑物的工艺设计。工程预计进水组成中,工业废水占有相当的比例,主要以电子废水为主。为解决废水可生化性较差、污水处理难度较大的问题,预处理采用高效水解工艺,降低工业废水毒性,改善废水可生化性,确保二级处理系统稳定运行。污水处理主体工艺推荐采用较长泥龄延时曝气,强化脱氮两级AO工艺,提高难降解有机物去除率。绝大部分进水都具有强酸性或者强碱性,且酸碱性波动范围较大,容易对污水处理流程造成冲击,对污水处理建构筑物造成较大腐蚀。此外,在废水处理站进水端设置较长停留时间的调节池,对来水进行均质调节,在一定程度上可以使废水的pH处在较为稳定的范围内;在废水处理站设置监测排放池,尾水排放前仍有应急调节pH的可能,确保尾水达标排放。通过技术经济比较论证,本次扩能工程拟采用不同类污水分质组合处理的工艺技术路线,提高处理效率,降低建设及运行成本。采用先进的上流式水解污泥床水解反应池池型,并加盖除臭、景观绿化,收集和处理构筑物内的臭气。调试运行结果表明,项目工艺流程及参数设置能够满足各类废水处理排放要求。 展开更多
关键词 污水处理厂 工业废水 电子废水 工艺流程 除臭
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不同负荷梯度对污水厂活性污泥的产酸性能分析
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作者 王柯丹 王保生 +3 位作者 蔺洪永 谢佳 黄龙 李海松 《净水技术》 CAS 2024年第4期95-103,共9页
活性污泥发酵产酸有利于实现污泥资源化利用。文中以污水厂活性污泥为研究对象,在污水厂现场采用半连续碱性发酵方法,探究了先低梯度再高梯度长周期提负荷过程中污泥的产酸性能。结果表明:低梯度提负荷运行阶段,第112 d污泥的酸化率达... 活性污泥发酵产酸有利于实现污泥资源化利用。文中以污水厂活性污泥为研究对象,在污水厂现场采用半连续碱性发酵方法,探究了先低梯度再高梯度长周期提负荷过程中污泥的产酸性能。结果表明:低梯度提负荷运行阶段,第112 d污泥的酸化率达到最大值,且乙酸占比为71.67%,游离氨(FA)质量浓度为(208±39)mg/L,低于250 mg/L,对微生物无抑制性。在高梯度提负荷阶段,第192 d污泥的水解率提高至41%,丁酸与戊酸的占比增加,FA质量浓度逐渐升高至450 mg/L时产酸性能下降。低梯度的优势菌Guggenheimella(24.88%)演变为高梯度的unclassified_Clostridiales(37.08%)。此外,当负荷为3250 mg TSS/(L·d)时,挥发性脂肪酸(VFAs)达到最大值(3339 mg COD_(Cr)/L)。经过50 d的稳定运行,污泥的产酸率为(606±30)mg COD_(Cr)/(g VSS)。合适的负荷梯度有助于污泥中有机物在碱性条件下(pH值=10.0±0.05)长期稳定连续生成VFAs。 展开更多
关键词 负荷梯度 污泥 碱性发酵 挥发酸组分 菌群演替 功能基因 污水厂
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工业园区混合废水处理厂工程设计与探讨:以福建某化工废水处理厂为例 被引量:1
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作者 戴炜豪 《净水技术》 CAS 2024年第2期126-134,共9页
福建某工业园区污水处理厂二期设计规模为2.0万m^(3)/d,工业园内的废水主要为石化工业废水。经过对工业园废水水质等特点的充分分析,该工程确定了“企业分类收集池+细格栅及曝气沉砂池+调节池(合建事故池)+水解酸化池+初沉池+生物反应池... 福建某工业园区污水处理厂二期设计规模为2.0万m^(3)/d,工业园内的废水主要为石化工业废水。经过对工业园废水水质等特点的充分分析,该工程确定了“企业分类收集池+细格栅及曝气沉砂池+调节池(合建事故池)+水解酸化池+初沉池+生物反应池+二沉池+芬顿高级氧化+三沉池+反硝化深床滤池+加氯消毒”的工艺路线。该工程设计出水水质执行《城镇污水处理厂污染物排放标准》(GB 18918—2002)中的一级A标准,污水厂部分概算工程费用为27906.73万元。该项目结合先进工艺和精细化设计,探讨了工业园区混合污水处理厂的部分设计要点,为国内类似工业污水厂提供一定思路和案例参考。 展开更多
关键词 废水处理厂 工业园区 化工废水 水解酸化 芬顿高级氧化
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污水处理过程中双酚A的环境健康风险分析综述
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作者 秦瑛蔚 刘兵 +3 位作者 胡杨 王静 陈禹兮 史水合 《净水技术》 CAS 2024年第6期20-28,62,共10页
双酚A(BPA)是市政污水处理厂常见的内分泌干扰物。作为一种新污染物,BPA具有低剂量、较高毒性的特征,对生态环境及人类健康存在潜在影响。文章系统总结了污水处理厂中BPA常见去除方法及其特点,通过分析部分污水处理厂再生水中BPA残留现... 双酚A(BPA)是市政污水处理厂常见的内分泌干扰物。作为一种新污染物,BPA具有低剂量、较高毒性的特征,对生态环境及人类健康存在潜在影响。文章系统总结了污水处理厂中BPA常见去除方法及其特点,通过分析部分污水处理厂再生水中BPA残留现状,得出BPA的主要去除途径为污泥吸附和生物降解,且其处理效果受设备参数、操作条件等综合因素影响。文章同时对不同工艺流程中BPA去除效果进行对比分析,指出了深度处理工艺对提高BPA去除效果的重要性。环境健康风险评价表明,现阶段污水处理过程中的BPA对人类健康风险较低,处于可接受范围,但其潜在风险仍值得人们关注,亟需探究科学合理的去除手段和完善的风险评价方法。最后,文章针对污水处理过程中BPA环境健康风险分析方面研究提出了合理化建议。 展开更多
关键词 污水处理厂 双酚A 去除效果 人体暴露 健康风险评价
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