活性炭吸附技术在工业园区污水厂深度处理中的应用

随着国家大力推进工业化建设,一大批工业园区拔地而起。在工业废水处理中引进利用活性炭吸附技术,是现代工业废水处理经过反复摸索研发出来的高效技术类型,本文对工业废水进行特点分析,全面介绍活性炭吸附技术的原理、应用优势、活性炭吸附试验方法以及优化完善技术应用的有效措施。希望活性炭吸附技术能够在工业废水处理中发挥积极作用,取得理想成效,保护环境,保护人类家园。

市政污水厂尾水处理人工湿地施工工艺技术要点

随着现代城市化进程加快,城市基础建设也越来越完善,其中市政污水尾水处理人工湿地工程的建设施工中涉及到多项关键工艺技术。文章阐述了市政污水尾水处理人工湿地工程的特征,结合邹城市一污尾水人工湿地工程,具体从地基、挡墙、防渗、填料、管道等施工环节,对相关工艺技术的实施要点进行了分析,希望能为相关工程的施工管理提供参考。

高效人工湿地技术在污水厂尾水处理中的应用

人工湿地技术是新时期社会发展下一种新型的尾水处理技术,具有处理效果好,运行成本低且对生态环境相对较为友好的诸多应用优势,因此,人工湿地技术深受社会大众的广泛关注。而尾水处理作为污水厂的重点工作内容,深受社会大众的广泛关注,通过切实发挥人工湿地技术的优势价值并实现在污水厂尾水处理中的有效应用,不仅能够切实提高污水厂尾水处理效果,提升尾水处理质量,更能从根本上缓解我国水资源压力,提高水资源利用效率。所以,需要以高效人工湿地技术为核心对其展开积极探究,以有效的应用策略提高污水厂尾水处理效果。

表面分子印迹聚合物修饰TiO_2纳米管去除污水厂二级处理出水中雌激素试验

制备了基于表面分子印迹聚合物修饰的TiO2纳米管（S-MIP—TiO2NTs）光催化剂，并利用SEM和FT-IR手段进行了表征。结果表明S—MIP—TiO2NTs的平均粒径为60nm，针对模板分子，相对于修饰前的TiO2纳米管（Ti02NTs），S—MIP—TiO2NTs的吸附选择性和光催化性能得到了提高。相对于高浓度范围（10～100mg／L），在低浓度范围（10～100μg／L）内S—MIP—TiO2NTs显示出较高的吸附催化性能。利用S—MIP—TiO2NTs可以去除尾水中部分代表性的雌激素，同时还具有较好的再生性能。

污水厂尾水再生利用深度处理组合工艺效果分析

为了考察臭氧-混凝-机械加速澄清池-紫外再生水深度处理组合工艺的处理效果,对北京市某再生水厂各工艺单元的进、出水常规指标、有机物及指示病原微生物的去除进行了研究。结果表明,组合工艺对色度、浊度、有机物及指示病原微生物都具有较好的去除效果。当进水CODCr为19.6-29.6 mg/L、色度为24-28度、浊度为2-3 NTU、总大肠杆菌和粪大肠杆菌为106 cfu/L时,出水CODCr〈20 mg/L、色度〈15度、浊度〈1 NTU、粪大肠杆菌〈3 cfu/L,出水水质可满足回用水的水质要求。

人工湿地在污水厂尾水处理方面的应用分析

尾水的处理与回收利用有利于减轻我国水污染问题的严重程度,对于促进水资源的可持续发展具有至关重要的意义。人工湿地的应用有利于提高污水厂对尾水处理的效率。本文分析人工湿地的原理以及其在污水厂尾水处理中应用的优势,阐述人工湿地在污水厂尾水处理方面应用存在的问题,并提出了具体应用的策略,从而有效实现我国水资源与经济的协调发展。

浅谈城市污水厂污泥的处理与处置

城市污水厂污泥的处理处置是污水厂处理事业的重要组成部分。本文综述了目前中国现有的城市污水厂污泥处理工艺流程和污水厂污泥处置的现状以及其中存在的问题。分析了城市污水厂污泥处理与处置应该注意的问题以及污泥处置国内外发展动态并指出了污水污泥土地利用时应该注意的问题和对策。

臭氧技术应用于污水厂深度处理存在问题的探讨

污水深度处理,也称高级处理或三级处理,它是将二级生化处理出水进行物理、化学和生物的强化处理,以去除污水中残余有机杂质,从而达到提标排放或回用要求。臭氧作为一种清洁强氧化剂被广泛应用于污水厂提标改造工程中,本文从臭氧工艺选择、臭氧投加方式选择以及臭氧工艺应用安全性几个方面对臭氧技术在污水厂深度处理段应用过程中存在的问题进行探讨与研究。

文山州污水处理厂现状

文山州是云南省下辖的民族自治州,位于中国西南边陲的云南省东南部,各污水处理厂的正常运营,为当地节能减排做出了积极贡献。

城镇污水处理厂进水抗生素抗性基因的控制与削减研究

抗生素抗性基因对人类健康和生态环境存在巨大隐患,城市污水处理厂肩负着控制抗生素抗性基因的重任。本文介绍了国内外城市污水处理厂对控制抗生素抗性基因的研究概况,重点综述并比较污水处理厂中不同消毒技术和深度处理技术对抗生素抗性基因控制的现状和发展,在此基础上提出结论和展望,以期为城市污水处理厂抗生素抗性基因的有效控制提供技术支撑。

我国城镇污水处理厂建设运行现状及存在问题分析

城市水污染的治理与污水处理厂的建设、运行和环境管理密切相关,因此需要大量的资金和技术投入。资金和技术在一定程度上决定了污水处理厂的建设规模和运行效果,是保证城市污水处理效率的重要措施。然而,资金问题已成为当前污水处理过程中亟待解决的问题。污水处理厂的运行状况和污水处理效率或多或少存在问题。这些问题需要污水处理厂负责人和管理人员的充分重视,并在行动中积极落实有效的污水处理措施,确保城市水资源的可持续发展。污水处理厂的建设和运行机制应充分考虑城市污水处理过程中的实际问题,从改善水环境质量的角度反映城市污水处理的效果。

浅谈污水AAO处理工艺

本文主要内容是简单的描述和分析了污水处理厂利用AAO工艺流程中各个构成部分的运作情况,并描述了污水处理厂平时的处理技术能源消耗不合理的问题。就当下我国的城市污水处理率比较低、污染性较大,生态调节压力大,而且就现在的技术来说处理技术大多面临高额资金投入的难题,就目前的情况来说,我国比较需要能源消耗较低、资金投较少、处理后污染环境程度低的生态型污水处理科技。

百菌清应急处理研究

文章研究了在模拟条件下污水厂中百菌清污染的应急处理措施。试验结果表明:投加粉末活性炭可有效地去除百菌清,确保出水达到水厂排放标准,粉末活性炭在40 min内即可完成对百菌清87%以上的吸附,投加量在1.0 g/L时,溶液中剩余百菌清的含量为痕量,在气象色谱的检测下限(0.024μg/L)范围内;混凝沉淀工艺对百菌清也有较好的去除效果,在混凝剂投加量为150 mg/L的条件下,百菌清的去除率可达85.39%;粉末活性炭吸附和混凝工艺联用可以形成互补,有效去除百菌清的同时保证处理后出水碳水分离。

集成式铁基质生物膜反应器自养反硝化深度脱氮

以污水厂处理水为研究对象,采用铁基质生物载体与生物膜耦合实现高效自养反硝化脱氮。考察停留时间(HRT)对系统脱氮效能的影响,通过动力学及微生物群落结构分析,揭示耦合技术的脱氮机理。结果表明:HRT为8 h,对一级A和一级B污水厂处理水,总氮(TN)平均去除率分别为95.41%和92.55%,TN处理负荷分别为0.48 kg TN/(m^3·d)和0.58 kg TN/(m^3·d),硝化过程氨氮(NH4^+-N)饱和常数分别为1.17 mg/L和0.72 mg/L,反硝化过程硝氮(NO3^--N)饱和常数分别为0.87 mg/L和0.67 mg/L。出水水质分别达到《地表水环境质量标准》Ⅲ类、Ⅴ类水质标准。铁基质生物载体与生物膜耦合系统中微生物优势菌属为Maritimimonas、Rhodobacter和Sphaerotilus,均为自养反硝化菌,证实了铁基质生物载体可为自养反硝化菌提供电子,实现生物自养反硝化脱氮。

Total concentrations and different fractions of heavy metals in sewage sludge from Guangzhou, China

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.

Advances in Energy-Producing Anaerobic Biotechnologies for Municipal Wastewater Treatment

Municipal wastewater treatment has long been known as a high-cost and energy-intensive process that destroys most of the energy-containing molecules by spending energy and that leaves little energy and few nutrients available for reuse, Over the past few years, some wastewater treatment plants have tried to revamp themselves as ＂resource factories,＂ enabled by new technologies and the upgrading of old technologies. In particular, there is an renewed interest in anaerobic biotechnologies, which can convert organic matter into usable energy and preserve nutrients for potential reuse. However, considerable technological and economic limitations still exist. Here, we provide an overview of recent advances in several cutting-edge anaerobic biotechnologies for wastewater treatment, including enhanced side- stream anaerobic sludge digestion, anaerobic membrane bioreactors, and microbial electrochemical systems, and discuss future challenges and opportunities for their applications. This review is intended to provide useful information to guide the future design and optimization of municipal wastewater treatment processes.

Experimental Study on Hydrothermal Drying for Sewage Sludge in Large-Scale Commercial Plant

The study was conducted to demonstrate the performance of the large-scale commercial plant of the hydrothermal drying of sewage sludge. Its performance was compared with that of the small-scale pilot facility to confirm the scaling effect of the facility. It has been shown that the optimum reaction temperature was 190℃ and reaction time was 30 minutes for both facilities. The dehydration performance of the products of the hydrothermal treatment and the natural drying performance of the dehydrated residue were almost the same for both facilities, which demonstrated that the small-scale pilot facility could simulate the commercial-scale plant well. With these optimum hydrothermal reaction conditions, the moisture content of the dehydrated product was less than 40% by the use of the frame filter, which had better dehydration performance than the centrifuge dehydrator. The moisture content of the dehydrated solid residue could be reduced less than 20% and 10% after 24 hours and 48 hours natural drying, respectively. The solubilization rate of sludge into the dehydrated liquid was 10% and 90% of the solid content in the raw sludge could be recovered as a dry solid fuel by this process with reduced energy requirement compared with conventional thermal drying processes. Too high reaction temperature or too long reaction time increased the content of solid material in the dehydrated liquid （solubilization rate of sludge） and reduced the yield of the dry solid fuel.

Extraction of Cadmium from Sewage Sludge Using Polyepoxysuccinic Acid

Polyepoxysuccinic acid （PESA）, as an environmental benign biodegradable chelant, was used to remove heavy metals from the sewage sludge of Shanghai Taopu Wastewater Treatment Plant. The extraction of cadmium （Cd） from sewage sludge using aqueous solution of PESA was studied. It was found that PESA was capable of extracting Cd from the sludge, and the extraction efficiency was dependent on both pH and the concentration of the chelating reagent. The extraction efficiency decreased gradually with increasing of pH, whereas the dependency on pH decreased as the concentration of PESA increased. In the case of the high PESA to total metal ratio, e.g., 10：1, the extraction efficiency reached above 70% within the pH range from 1 to 7. The highest extraction efficiency obtained in tbe experiment was 78%. By comparing the contents of the heavy metals in sewage sludge before and after the extraction, it was found that the extracted Cd came mainly from the four fractions： acid-soluble, reducible, oxidizable, and water-soluble fractions.

Herbal medicines for the management of irritable bowelsyndrome:A comprehensive review

Irritable bowel syndrome (IBS) is a functional gut disorder with high prevalence.Because of various factors involved in its pathophysiology and disappointing results from conventional IBS medications,the treatment of IBS is challenging and use of complementary and alternative medicines especially herbal therapies is increasing.In this paper,electronic databases including PubMed,Scopus,and Cochrane library were searched to obtain any in vitro,in vivo or human studies evaluating single or compound herbal preparations in the management of IBS.One in vitro,3 in vivo and 23 human studies were included and systematically reviewed.The majority of studies are about essential oil of Menta piperita as a single preparation and STW 5 as a compound preparation.Some evaluated herbs such as Curcuma xanthorriza and Fumaria officinalis did not demonstrate any benefits in IBS.However,it seems there are many other herbal preparations such as those proposed in traditional medicine of different countries that could be studied and investigated for their efficacy in management of IBS.

Evaluation of Estrogenic Activity and Measurement of EDCs in Wastewater Treatment Plants

Correlations between estrogenic activity and DOC/UV260 ratio in wastewater treatment processes were investigated to propose a simple, reliable and comprehensive indicator for the presence of estrogenic substances. Contrary to this, when short-term bioassays such as the E-SCREEN, receptor binding and reporter gene expression assays are used for detecting estrogenic activity in the wastewater sample, they require a long time, at least a few days. The major factors contributing to the estrogenic activity were found to be 17β-estradiol （E2） and estrone （El）. A good relationship between the DOC/ UV260 ratio and the concentration of estrogens （El and E2） in the effluent of the activated sludge process was found： the E2 concentration increased as the DOC/UV260 ratio increased while the E1 concentration decreased. The relative estrogenic activity and DOC/UV260 ratio showed a good correlation （R^2 = 0.84） for all sewage samples except the ozonized samples in the sewage treatment plants. This study shows that the estrogenic compounds are hard to be mineralized by the conventional biological processes. Advanced oxidation processes are required to further remove estrogenic substances in the secondary effluent. By analysis of DOC and UV260, the estrogenic activity in the wastewater can be rapidly estimated.