Stable Isotopic Signatures of NO3 in Waste Water Effluent and Los Angeles River

A metropolitan city such as Los Angeles (LA) is an ideal study site with a very high population density, and it houses at least 3 treatment plants where sewage is treated preliminarily and then progressing to tertiary treatment before discharging into the LA River. We will gain a better understanding of the water quality in the LA River and the nitrate load in the watershed system by examining the influence of waste water treatment plants (WWTPs). The goal of this study is to pinpoint the exact source of nitrate in the LA River using the isotope signatures. We have selected sampling locations both upstream and downstream of the WWTP. This serves to monitor nitrate levels, aiding in the assessment of treatment plant effectiveness, pinpointing nitrate pollution sources, and ensuring compliance with environmental regulations. The research explores the isotopic composition of NO3 in relation to atmospheric nitrogen and Vienna Standard Mean Ocean Water, shedding light on the contributions from various sources such as manure, sewage, soil organic nitrogen, and nitrogen fertilizers. Specifically, there is a change in the δ15NAir value between the dry and wet seasons. The isotope values in the Tillman WWTP sample changed between dry and wet seasons. Notably, the presence of nitrate originating from manure and sewage is consistent across seasons, emphasizing the significant impact of anthropogenic and agricultural activities on water quality. This investigation contributes to the broader understanding of nitrogen cycling in urban water bodies, particularly in the context of wastewater effluent discharge. The findings hold implications for water quality management and highlight the need for targeted interventions to mitigate the impact of nitrogen-containing compounds on aquatic ecosystems. Overall, the study provides a valuable framework for future research and environmental stewardship efforts aimed at preserving the health and sustainability of urban water resources. This data informs decisions regarding additional treatment or mitigation actions to safeguard downstream water quality and ecosystem health.

Current Seasonal Variations in Physicochemical and Heavy Metals Parameters of Sewage Treatment Plant Effluent and Suitability for Irrigation

The study aims to investigate the current extent of physicochemical parameters and heavy metal contamination in the effluent of the Jaganpur sewage treatment plant (STP), Dayalbagh, Agra India. Majority of the nearby farmers have access to use of STP effluent in irrigation purposes for growing major edible crops. The problems of using STP effluent for irrigation purpose, continuous water quality analysis required. To check the quality of irrigation water, substantial physicochemical parameters accordance to Indian Standards (IS-Reaffirmed 2002/2003) analysed to calculate Sodium absorption ratio (SAR) and Residual sodium carbonate (RSC). To estimate the heavy metal pollution index (HPI) and metal quality index (MQI), toxic Heavy metals such as As, Cr, Mn, Fe, Ni, Cu, Zn, Pd, Cd, Co, and B also determined in the STP effluent with an AAS and results verified with ICP-OES against certified standards. The high value of SAR (range 13 to 20) and RSC (range -10 to 11) in STP effluent exceeded the permissible limit for irrigation purpose. On the other hand, HPI and MQI values (1692.4 and 58.1, respectively) show that high metal contamination mainly due to industrial and domestic wastewater does not treat appropriately in the sewage treatment plant. Thus it is suggested that further studies are carried out on the STP effluents to improve the water quality through proper treatment. Treated wastewater used for irrigation purposes needs to analyse the contamination like heavy metals and pinpoint the pollution sources.

Water Analyses, Eco-Balance and Socio-Demographic Analyses as Prerequisites for Solutions of the Sewage Treatment Problems in Rural Areas

The implementation of the EU-water framework directive (EU-WFD) demands a financeable and adaptable sewage treatment, creating a need for action especially in rural areas, where the “good ecological status” is often not reached even though the sewage works fulfill the legal minimum requirements. Therefore the construction of new, more efficient wastewater treatment plants is advisable. Due to the precarious financial situation in most rural areas, many municipalities can however not master the necessary funds for an improved waste water infrastructure. A large part of the costs would have to be shouldered by the local population in the form of additional sewage levies, leading to massive socio-economic strain. Hence, different solutions, which are tailored to the socio-economic, demographic and environmental characteristics of rural areas and fulfill the legal requirements, need to be developed. One possible approach is presented in the form of the Dirlammen case study (municipality Lautertal, Hesse, Germany). It consists of 1) biological and physicochemical analyses of the waste waters, 2) a modified eco-balance for the construction of a new sewage works and 3) socio-economic and demographic analyses of the population. It serves as a tool for the assessment of the influencing ecological, socio-economic and demographic factors on the sewage problems in rural areas. These findings can easily be transferred to other rural areas with a similar configuration and thus deliver the basis for a generally applicable approach to these problems. The results of the comprehensive analysis have shown for the municipality Dirlammen/Lautertal that the continued operation of the existing pond sewage plant is, with regards to the ecological, socio-economic and demographic points of view, preferable to the construction of a new waste water treatment plant. With regard to the sustainability principles of the sewage treatment and the objectives of the EU-WFD, existing sewage works should be operated for as long as the sewage treatment is feasible within technical and legal boundaries. With the construction of new facilities on the other hand, the expected improvement of the water quality has to be weighed against the ecological impairments caused by the construction itself. Rural waste water plans have to be developed for the long-term, taking not only the ecology into account but also the demographic change. Possible approaches in this regard could be a shift towards a decentralized waste water treatment concept and–even more important–improvements of the river morphology. But also the reduction of the diffuse pollution from agricultural sources should be considered for the development of strategies for the improvement of the ecological state. Short-term optimization measures in the existing sewage works might also improve the water quality until the long-term development plans can be implemented. In particular the challenges of the demographic change and linked with that the changing requirements for the rural waste water treatment must be addressed by any future plans. Only with the help of such a comprehensive approach the dangers of bad planning and unacceptable socio-economic burdens can be minimized.

Behavior of Antibiotic-Resistant Fecal Coliforms in the Stream of a Sewage Treatment Plant in Tokyo

We are confronting a new threat in the prevalence of antibiotic-resistant bacteria followed by epidemic spread in aquatic environments in metropolitan areas because damage from river floods is increasing remarkably in Japan due to global extreme weather. The sewer penetration rate is about 100% in Tokyo and reclaimed water from sewage treatment plants accounts for over 50% of all water in both the down- and mid-stream areas of local rivers. The water quality of these rivers, which contain microflora, seems to be seriously affected by reclaimed water. In this study, we collected water samples on July 17, 2018 and examined the behavior of antibiotic-resistant fecal coliforms in the stream of a sewage treatment plant in Tokyo. Extended-spectrum β-lactamase (ESBL)-producing fecal coliforms with encoding genes were found;the CTX-M-1, CTX-M-9, TEM, and SHV groups were found to have survived in the final effluent to the river after sterilization with sodium hypochlorite.

长江大保护试点城市某污水处理厂尾水湿地净化效果研究

为探寻污水处理厂配套尾水湿地净化效果,以长江大保护试点城市某污水处理厂尾水湿地为例,通过现场调查与采样,分析湿地出水水质特征,探讨影响湿地污染物去除效率因素。结果表明:尾水湿地出水COD、NH_(3)-N及TP浓度满足设计目标,潜流湿地对COD去除率较高,表流湿地对氨氮及磷的去除率较高,优于涵养塘;湿地实际运行水力负荷、水力停留时间和污染物负荷与设计值不符,影响污染物去除效果;据此提出湿地运行优化建议,促进湿地深度脱氮除磷,提升尾水湿地效能;运行优化可提高潜流湿地污染物去除率,同时污水处理厂减少碳排放94.74 gCO_(2)m^(3)。研究结果可为该尾水湿地运行管理及长江大保护试点城市系列污水处理厂配套尾水湿地设计与运维提供参考。

城镇复合型污水处理厂水质监测与微生物分析

城镇复合型污水处理厂发挥着处理辖区工业污水与生活污水的作用.其中的生化段是污水处理厂的核心部分,生化处理效果依赖于多样的微生物群落,生物的多样性是高效去除有机物、氮和磷等污染物质的重要保证.在此,对长江流域城镇复合型污水厂L的工艺水质及微生物基因数据进行了系统的分析.首先,对污水厂L进出水与各处理工段水质进行监测,并且对生化段进行了沿程监测,结合运行数据与监测数据,评估了污水处理厂实际运行效果.工业废水进水没有对污水处理厂L造成冲击,各工艺段运行基本稳定,出水水质基本达标.进一步利用宏基因组测序技术,对污水处理厂L氧化沟工艺的活性污泥样本进行了微生物群落结构的研究.结果表明,氧化沟中存在着功能各异的微生物.微生物的多样性和相对丰度在不同区域之间表现出差异,这种差异反映了其适应不同环境条件的能力.通过生态代谢组学分析,探讨了微生物群落的功能特征,群落中不同种微生物在有机物降解、脱氮和除磷等关键生化过程中发挥各自的作用,协同工作以实现废水处理的高效性.通过对污水厂运行监测数据的分析及微生物群落基因的研究,有助于全面地评价并诊断污水厂的运行情况.

基于减污降碳和水质目标约束下的黄河干流兰州段城区污水处理厂出水排放限值研究

为科学合理地提出黄河干流兰州段城区污水处理厂出水排放限值,实施精准科学治污,持续改善黄河干流兰州段水环境质量,本文以兰州市城区四座有代表性的污水处理厂(西固、七里河安宁、盐场和雁儿湾污水处理厂)为研究对象,统计四座污水处理厂主要污染物排放浓度、中水回用率、主要污染物去除率及减排效果,分析四座污水处理厂入河排污对黄河干流兰州段水质的影响,梳理污水处理厂运行阶段的碳排放情况.结果表明:(1)兰州市城区四座污水处理厂中水回用率低,介于0.86%~4.66%之间.(2)四座污水处理厂主要污染物的去除率高于国内污水处理厂主要污染物去除率的平均水平,COD、NH_(3)-N年均减排量分别为114584.1、8234.6 t,减排效果明显.(3)在黄河枯水期上游来水水量小、水质接近或超出GB 3838-2002《地表水环境质量标准》Ⅱ类水质目标限值的条件下,叠加区间其他入河排污口的影响,兰州市城区四座污水处理厂均按照设计规模及设计出水水质排污会对下游河段水质造成影响.因此,不能一味地追求出水水质,盲目提标改造,要综合考虑污水处理厂运行过程中的碳排放,在满足受纳水体水质目标前提下,统筹考虑减污降碳.

佛山市某污水厂技改工程实例

介绍了佛山某污水处理厂技改工程的工艺流程和设计参数。在用地紧张的条件下,改造原有构筑物,新建“深度处理+超滤反渗透+浓水处理”为主体工艺的中水回用系统。实际运行结果表明,技改后满足扩容减排的政策要求,出水水质稳定达标排放,为类似污水处理厂的技改提供了相关设计经验。

三角帆蚌对城镇污水处理厂尾水深度净化效果及机理研究

以某城镇污水处理厂尾水为试验对象,设计了一种贝类立体净化系统,选择三角帆蚌作为试验贝类,考察三角帆蚌对城镇污水处理厂尾水深度净化效果及其机理特征.结果表明,三角帆蚌对城镇污水处理厂尾水COD_(cr)(化学需氧量)、NH_(3)-N(氨氮)、TP(总磷)净化效果均能稳定达到《地表水环境质量标准》(GB 3838-2002)的Ⅳ类标准,对COD_(cr)、NH_(3)-N、TP的平均去除率分别为48.2%、56.2%、63.9%,三角帆蚌体质量每生长1 kg所能削减的COD_(cr)、NH_(3)-N、TP污染量分别为91.69、6.42、1.46 g.三角帆蚌主要通过发达的滤食组织系统,将尾水中C、N、P等物质吸收转化为贝壳和软组织生长元素,一方面可以深度净化尾水水质,另一方面贝类可被提取作为生态产品,带来经济效益.进而对城镇污水处理厂尾水深度净化应用提供科学技术依据.

某污水处理厂水质指标的监测与处理效果分析及评价

某污水处理厂肩负着该市工业以及生活污水处理的重任,对某污水处理厂的水质指标进行监测,并对污染物的去除效果进行分析及评价。结果表明:某污水处理厂对污水进行处理后,pH为7.18~7.62;COD为10~27mg/L,出口COD去除率为88%~95%;BOD_(5)为1~7.5 mg/L,BOD_(5)去除率为90%~97%;氨氮浓度为0.7~2.5 mg/L,NH_(3)-N去除率为90%~97%;TN浓度范围10~13mg/L,TN去除率为75%~80%;TP浓度为0.2~0.4mg/L,TP去除率为83%~88%。通过与GB 18918-2002《城镇污水处理厂污染物排放标准》中一级B标准规定的最高允许排放浓度标准值比较,该污水处理厂各污染物浓度均达到标准要求,且处理效果比较稳定。

滨海河网地区城镇污水处理厂污泥产率影响因素研究

本文以广州市滨海河网地区4座典型城镇污水处理厂为研究范围,分析了进水COD、BOD、SS浓度以及气温等对污泥产率的影响。研究结果表明:(1)滨海河网地区城镇污水处理厂的污泥产率相对较低,不同污水处理工艺的污泥产率季节变化规律不同,CASS工艺夏季污泥产率较高,AAO工艺秋季污泥产率较高;(2)污泥产率与进水水质密切相关,对于进水浓度较低的污水厂,污泥产率与COD、BOD、SS浓度呈现弱的负相关关系,反之,呈现正相关关系,且浓度越高,相关性越强;(3)滨海河网地区四季温差不大,气温对污水厂的污泥产率影响较小。(4)通过控制进水水量水质,优化运行参数优化等措施尽可能保障活性污泥处理系统安全稳定高效运行,实现污泥减量化。

污水处理厂智慧管控平台的设计要点概述

通过研究分析污水处理厂的运行情况,为污水处理厂提供一个可行的智慧水务管理技术方案,全方位提高水厂的管理水平。帮助污水处理厂实现了电子化的生产运行数据记录、信息化的数据查询共享方式、规范化的生产运行管理体系、智能化的数据汇总和统计、高度灵活的报表配置和导出、图形化的数据统计分析结果展现,从而提高生产运行数据的准确性,减少管理人员数据统计分析的工作量,提高生产运行管理效率。并对污水处理系统进行全面检视、改进、优化,提高污水厂运行的自动化、信息化、智能化水平,减少污水厂的能耗、药耗,降低运维人工成本,提升污水厂的经济、环境、社会效益。

组合人工湿地技术在污水处理厂尾水深度净化中的应用

针对盐城市大丰污水处理厂出水为一级A标准,直排入河将污染周边水系,影响周边环境生态安全等问题,采用“强化净化湿地+深度涵养湖泊”的组合湿地工艺对污水处理厂尾水进行深度净化,结果表明,组合人工湿地系统对COD、NH3-N、TN及TP的平均去除率分别为76.01%、54.83%、63.46%及40.72%,该技术对污水处理厂尾水深度净化的效果较好,出水能稳定达到《地表水环境质量标准》(GB 3838—2002)III类标准。

机器学习用于城镇污水处理厂进水预测的实践研究

通过分析比较不同的污水处理厂进水预测方法,并对影响进水情况的有关因素进行相关性分析,采用基于机器学习的BP神经网络模型来预测污水处理厂的日进水量及化学需氧量。利用位于国内南方和北方的两个典型污水处理厂的实际运行数据进行试验,结果显示该模型预测精度良好,与实际数据偏差保持在5%以内。

旅客吞吐量对某机场污水处理厂的影响

为研究旅客吞吐量对某机场污水处理厂运行效果的影响,选取该污水处理厂2021—2023年的各项监测指标,包括水量、水质、活性污泥和现场调控工艺等开展研究。结果表明,该污水处理厂各类指标均受到不同程度的影响。其中,处理水量、水质指标总磷和总氮、微生物种类受旅客吞吐量的影响较大。经过工艺的调整,使得2021—2023年的各项出水指标良好,整体运行稳定。

混合式植物生态岛对污水处理厂污水的净化效果研究

针对当前河流水环境污染严重等问题,提出基于水生植物构建混合式植物生态岛的污水处理厂污水净化策略。论文选择5种常见的植物,选择不同的组合进行实验。实验结果显示,基于凤眼蓝+慈姑+水生美人蕉组合构建的生态岛对污水的净化效果最明显,对水体中化学需氧量(Chemical Oxygen Demand,COD)、总磷(Total Phosphorus,TP)、总氮(Total Nitrogen,TN)、氨离子(NH4+)的去除率分别达到了31.68%、78.42%、46.88%、56.73%,均高于其他组合构建的生态岛。

污水提质增效中截流井的优化思路

结合广州市南沙区开展的污水提质增效工程经验,针对现状截流井,分析其存在的主要问题。该文提出如何科学优化截流井,使截流井既能发挥收集污水的作用,又能避免过多外水进入污水系统的优化思路,从而实现污水处理厂的提质增效。

精确加药控制系统在污水处理厂中的应用

针对污水处理厂运行过程中的加药问题,将智能控制和生化系统控制深度融合,采用算法逻辑推导、在线仪表数据反馈、变频调节技术对加药量进行精确调节,并不断修正加药量,通过实践检验其效果。实践表明,通过应用精确加药控制系统实现了生产运行自动化,降低了工作人员的劳动强度,可避免过量加药,保障了出水稳定达标,全面提升了污水处理厂的精细化管理水平。

东南沿海某污水处理厂尾水深海排放设计研究

为进一步提高海底输水管线设计质量,文中以实际工程为研究对象,深入分析污水处理厂尾水深海排放建设项目设计要点,详细介绍了该工程的陆域管线设计思路以及海底管线设计技术要点,重点研究了海底管线工程管道计算、参数设计以及海底管线稳定性分析等的思路。结果表明,本工程设计的海底管线方案满足不同工况需求,研究内容能指导后续工程建设,为海底输水管线设计工作的开展提供参考。

江门市某污水处理厂污水水质监测结果分析

随着人类社会的迅猛发展,水污染成为了人类发展共同面临的挑战。以江门市某污水处理厂为例,为准确掌握该厂污水水质,对污水的悬浮物(SS)、重铬酸盐指数(COD_(Cr))、总氮(TN)、总磷(TP)和五日生化需氧量(BOD_(5))等进行了监测,分析其变化规律。结果表明,江门市某污水处理厂SS、COD_(Cr)、TN、TP、BOD_(5)的去除率均保持在较高水平,出水的各指标均小于标准最高允许排放浓度;SS、TN、TP呈现明显的季节特性,进水各指标均夏季远低于冬季;COD_(Cr)去除率夏季高于冬季,TP的去除率夏季低于冬季。该水质监测分析为当地实际污水处理和水质监测工作提供了科学指导。