共查询到19条相似文献,搜索用时 218 毫秒
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将污水中蕴含大量的有机物收集浓缩转化成甲烷等可利用能源,是污水资源化利用的重要方式。利用膜分离作用,将原污水的有机物直接收集浓缩,并探索最佳运行参数和操作策略。结果表明,截留有机物停留时间为3~4 d较合适,耗氧污染物(以COD计)回收率超过90%。能量平衡分析显示,通过回收有机物转化为甲烷能量为0.087 6 kW·h-1·m-3,回收量占总能耗的33%。中孔纤维膜表面形成的吸附性滤饼层阻止有机物与膜紧密结合,提高了膜分离效率。进一步解析了膜污染控制机理,以探索提高耗氧污染物(以COD计)浓缩效率的优化方案。本研究结果可为污水碳源捕获方法的研究提供参考,对城市水务行业碳减排工作有积极意义。 相似文献
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粉煤灰在水厂污泥处理和处置中的作用研究 总被引:4,自引:0,他引:4
在水厂污泥水中加入电厂粉煤灰,不需再添加其他材料,即可以很好地改善水厂污泥的脱水性能。细粉煤灰最佳投加量为20%,粗粉煤灰最佳投加量为30%,不但可以节约能耗,粉煤灰有了新的出路,干化污泥对环境友好,而且还能制成低热值燃料作焚烧处置,回收部分热能。 相似文献
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处理含酚废水,普遍采用有机溶剂萃取法、吸附法、生物氧化法,这些方法均存在一定的缺陷。作者以江苏省神农集团合成分厂为例,从回收处理呋喃酚废水的治理人手,详细论述了采用离心器及络合萃取剂回收处理污水的工作原理、工艺流程及投资收益。试验结果:该回收处理呋喃酚污水方法运行效果好,确保处理后的废水含酚量在0.5mg/L以下,酚回收率大于95%,具有可观的经济效益、社会效益和环境效益。 相似文献
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甘氨酸厂氨氮废水治理的工艺及实验研究 总被引:2,自引:0,他引:2
运用多效真空蒸发兼热泵技术回收甘氨酸厂高氨氮废水中的氯化铵,通过实验找到了治理此废水的最佳真空度,克服了采用常规蒸发方法的能耗大、料液对设备腐蚀性强的缺点。最后运用吹脱法对蒸发冷凝水进行了治理,通过实验得到了吹脱的最佳工艺参数:吹脱时间6h、pH12.5、吹脱温度60℃,为运用生化法彻底解决甘氨酸厂高氨氮工业废水的污染难题奠定了基础。 相似文献
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侧流磷回收强化低碳源污水脱氮除磷效果的模拟与实验研究 总被引:1,自引:0,他引:1
以实验室营养物(BNR)去除工艺为研究对象,通过模拟预测与实验验证,对侧流磷回收强化低碳源污水脱氮除磷效果的影响进行研究.实验结果与模拟预测均显示,在低碳源生活污水(BOD5/TKN=3.2,COD/TKN=4.8,COD/TP=48.9)前提下,厌氧上清液侧流磷沉淀/回收可以使得出水氮、磷达标(TP≤0.5 mg P/L、TN≤15 mg N/L).研究结果表明,侧流磷回收可以相对提高后续生物脱氮除磷所需C/N、C/P比,从而强化低碳源污水生物营养物去除效果.模拟预测与实验验证几乎一致的结果表明,数学模拟技术完全可以取代传统实验,对所关心的工艺运行问题进行准确预测. 相似文献
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选用适合热电厂特点的水处理剂,利用静态试验。动态模拟试验手段,对城市生活污水回用于热电厂循环冷却水系统中的复配药剂的阻垢缓蚀性能进行了研究。通过试验表明。污水回用是可行的,为城市生活污水回用于热电厂循环冷却水系统工程提供了可靠的参数。 相似文献
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造纸工业污泥燃烧特性及动力学实验研究 总被引:4,自引:2,他引:2
在不同升温速率及与其他污泥不同混合比例条件下,利用热重法对造纸污泥和含工业污水污泥进行了实验研究。结果表明,造纸污泥与含工业污水污泥表现出不同的DTG曲线形式,其中造纸污泥固定碳燃烧峰失重较为明显。随着升温速率的提高,造纸污泥的燃烧速率加大,燃尽时间缩短,提高了其综合燃烧特性;加入含工业污水污泥后,造纸着火性能及燃尽性能均得到改善。采用积分法(Coats-Redfern方程)计算得到各阶段燃烧反应的机理方程及相应的活化能参数,表明活化能的大小与试样的燃烧阶段是相对应的。 相似文献
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Anaerobic codigestion of municipal, farm, and industrial organic wastes: a survey of recent literature. 总被引:3,自引:0,他引:3
Felipe Alatriste-Mondragón Parviz Samar Huub H J Cox Birgitte K Ahring Reza Iranpour 《Water environment research》2006,78(6):607-636
Codigestion of organic wastes is a technology that is increasingly being applied for simultaneous treatment of several solid and liquid organic wastes. The main advantages of this technology are improved methane yield because of the supply of additional nutrients from the codigestates and more efficient use of equipment and cost-sharing by processing multiple waste streams in a single facility. Many municipal wastewater treatment plants (WWTPs) in industrialized countries currently process wastewater sludge in large digesters. Codigestion of organic wastes with municipal wastewater sludge can increase digester gas production and provide savings in the overall energy costs of plant operations. Methane recovery also helps to reduce the emission of greenhouse gases to the atmosphere. The goal of this literature survey was to summarize the research conducted in the last four years on anaerobic codigestion to identify applications of codigestion at WWTPs. Because the solids content in municipal wastewater sludge is low, this survey only focuses on codigestion processes operated at relative low solids content (slurry mode). Semi-solid or solid codigestion processes were not included. Municipal wastewater sludge, the organic fraction of municipal solid waste, and cattle manure (CAM) are the main wastes most often used in codigestion processes. Wastes that are codigested with these main wastes are wood wastes, industrial organic wastes, and farm wastes. These are referred to in this survey as codigestates. The literature provides many laboratory studies (batch assays and bench-scale digesters) that assess the digestibility of codigestates and evaluate the performance and monitoring of codigestion, inhibition of digestion by codigestates, the design of the process (e.g., single-stage or two-stage processes), and the operation temperature (e.g., mesophilic or thermophilic). Only a few reports on pilot- and full-scale studies were found. These evaluate general process performance and pretreatment of codigestates, energy production, and treatment costs. 相似文献
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Wilk Barbara K. Fudala-Ksiazek Sylwia Szopińska Małgorzata Luczkiewicz Aneta 《Environmental science and pollution research international》2019,26(25):25690-25701
Environmental Science and Pollution Research - In this study, wastewater from municipal services, such as a port wastewater reception facility (PRF-WW) and a municipal solid waste plant (MSWP), was... 相似文献
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Tingting Wu James D. Englehardt Tianjiao Guo Lucien Gassie Aaron Dotson 《Environmental science and pollution research international》2018,25(33):33025-33037
Challenges of water and wastewater management in Alaska include the potential need for above-grade and freeze-protected piping, high unit energy costs and, in many rural areas, low population density and median annual income. However, recently developed net-zero water (NZW), i.e., nearly closed-loop, direct potable water reuse systems, can retain the thermal energy in municipal wastewater, producing warm treated potable water without the need for substantial water re-heating, heat pumping or transfer, or additional energy conversion. Consequently, these systems are projected to be capable of saving more energy than they use in water treatment and conveyance, in the temperate USA. In this paper, NZW technology is reviewed in terms of potential applicability in Alaska by performing a hypothetical case study for the city of Fairbanks, Alaska. Results of this paper study indicate that in municipalities of Alaska with local engineering and road access, the use of NZW systems may provide an energy-efficient water service option. In particular, case study modeling suggests hot water energy savings are equivalent to five times the energy used for treatment, much greater savings than in mid-latitudes, due largely to the substantially higher energy needed for heating water from a conventional treatment system and lack of need for freeze-protected piping. Further study of the applicability of NZW technology in cold regions, with expanded evaluation in terms of system-wide lifecycle cost, is recommended. 相似文献
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随着大量污水处理厂的建成投运,中国污水处理事业的重心必然会从以建设为主转向建设与运行并重,运行管理将发挥越来越重要的作用。文中以南京市某城镇污水处理厂为例,分析该污水处理厂运行过程COD、NH^3-N排放超标问题,并提出对策(健全配套污水收集管网,提升工艺参数DO、NO^3-、NO^2-的控制水平,规范运行台账管理等),以期为其他城镇污水处理厂的运行管理提供参考。 相似文献
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城市污水中有关新型微污染物PPCPs归趋研究的进展 总被引:7,自引:0,他引:7
药品和个人护理用品 (PPCPs) 是最近十年引起关注的新型有机微量污染物,其引起的环境安全风险受到人们越来越多的关注。一些研究发现,城市污水处理厂出水中存在着一定浓度的PPCPs,城市污水排放是PPCPs进入环境的一条重要途径。从城市污水中PPCPs的分析方法、迁移转化和减量化技术研究等三个方面综述了有关PPCPs在城市污水中归趋的研究进展,介绍了我国城市污水中PPCPs的研究现状;并对在我国进行相关研究提出了建议,以期推动相关研究的开展。 相似文献
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The performance of an innovative membrane bioreactor (MBR) process using anoxic phosphorus uptake with nitrification and denitrification for the treatment of municipal wastewater with respect to operational performance and effluent quality is addressed in this paper. The system was operated at steady-state conditions with a synthetic acetate-based wastewater at a hydraulic retention time (HRT) of 12 hours and on degritted municipal wastewater at a total system HRT of 6 hours. The MBR system was able to achieve 99% biochemical oxygen demand (BOD), chemical oxygen demand (COD), and ammonia-nitrogen (NH4(+)-N); 98% total Kjeldahl nitrogen (TKN); and 97% phosphorus removal, producing effluent BOD, COD, NH4+-N, TKN, nitrate-nitrogen, nitrite-nitrogen, and phosphate-phosphorus of <3, 14, 0.2, 0.26, 5.8, 0.21, and <0.01 mg/L, respectively, at the 6-hour HRT. The comparison of the synthetic and municipal wastewater run is presented in this paper. Steady-state mass balance on municipal wastewater was performed to reveal some key features of the modified MBR system. 相似文献