共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
3.
4.
5.
6.
为了实现污泥的稳定化、减量化和无害化,对城市污水处理厂的浓缩污泥和厌氧消化污泥进行了好氧处理试验研究.试验结果表明,污泥好氧处理使污泥中有机物质含量降低,臭味减小.厌氧污泥经好氧消化处理后,一方面使污泥得到稳定化和减量化;另一方面,可以把污泥中的致病菌杀死.污泥经好氧消化后沉降性能有明显提高,絮凝剂的加入使其脱水性能也得到一定的改善. 相似文献
7.
介绍了绍兴污水处理厂污泥处理工程的改扩建设计,设计中对现有污泥处理脱水构筑物及设备进行了改造,解决了其污泥脱水性能较差的问题,充分发挥了现有设施的处理能力,污泥预处理能力达到350 tDS/d(83%含水率污泥为2 059t/d),新建处理能力为370 tDS/d(80%含水率污泥为1 850t/d)的污泥处理设施,全厂污泥全部处理后外运处置. 相似文献
8.
《建设科技(建设部)》2013,(3)
一、立项背景
目前,国内外污泥脱水研究主要集中在污泥预处理、污泥脱水性能改善、脱水药剂遴选和提高污泥脱水效率等方面.目前,污泥脱水主要采用离心沉降、带式压滤和板框压滤三种机械形式.前二者在污泥脱水处理中仍占据较大比例,而板框压滤的应用则起步较晚,但优点是污泥含水率可降至60%以下(污泥须经一定的预处理).
项目针对上述研究现状,综合应用多项技术,建立了一种污泥脱水处理的创新技术,并形成了全套的处理工艺:以三氯化铁和石灰为调理剂对污泥进行预处理,采用隔膜压滤工艺对污泥进行脱水处理,并将滤液回流至进水泵房,处理后的污泥泥饼能达到污泥后续处理的要求. 相似文献
9.
10.
11.
12.
EFOR程序的仿真模拟功能应用研究 总被引:19,自引:7,他引:19
对国际水质协会(IAWQ)的活性污泥数学模型进行了应用性研究。即利用EFOR程序对某城市污水处理厂工艺设计进行动态模拟。结果表明,该模型作为开展污水处理新技术开发、工艺设计计算方法研究和计算机模拟软件开发的通用平台,适合我国的国情,具有实用价值,值得推广。 相似文献
13.
14.
15.
16.
污泥脱水、输送及储存系统是污泥处理处置工程的重要组成部分,以南宁某项目为例,介绍了污泥脱水工艺、进泥设备、加药系统及泥水分离阀的设计及优化建议;介绍了污泥输送螺旋、缓存料斗及料位检测的工程应用特点,提出一体化破拱装置,详述污泥输送泵及其故障处理方式;介绍了污泥储存系统的管道、入料口的设计要点,滑架破拱装置的设计优化及其液压系统热平衡分析等。该项目投入运营后,脱水污泥含水率降至80%,污泥的日输送量达到66.85 m3/d,污泥储存系统储存量达到200 m3,实现了污泥的减量化生产。最后对该工程进行技术经济分析,为同类项目提供参考。 相似文献
17.
Feasibility of using a chlorination step to reduce excess sludge in activated sludge process 总被引:36,自引:0,他引:36
The ultimate disposal of excess sludge generated from activated sludge processes has been one of the most challenging problems for wastewater treatment utilities. Previous work has shown that excess sludge can be minimized successfully by using sludge ozonation to dissolve it into substrates to be oxidized in the aeration tank. However, this approach is a costly option. Therefore, as an alternative solution, we propose to use chlorination to replace ozonation in excess sludge minimization in the light of operational cost. To investigate the feasibility of this low cost approach, this paper mainly focuses on the effect of chlorination on sludge reduction rate, formation of trihalomethanes, sludge settleability, and effluent quality. Two identical activated sludge membrane bioreactors were continuously operated with synthetic wastewater under the same operation conditions for several months. During this period, one pilot unit was used as the reference system without chlorination of excess sludge, while another served as a testing unit, where excess sludge was taken out for conducting chlorination at a dose of 133mg/g MLSS every day and the chlorinated liquor was then returned to the aeration tank. The sludge production rate and the water quality of both the units were analyzed daily. It was observed that the sludge production could readily be reduced by 65% once the chlorination treatment was involved. However, the chlorination treatment also resulted in poor sludge settleability as well as significant increase of soluble chemical oxygen demand in the effluent, which creates potential difficulties in the operation of a conventional treatment plant with gravity clarifiers. However, it has been demonstrated that by integrating the immersed membrane into the activated sludge process these difficulties can be overcome effectively. 相似文献
18.
Comparison of humification processes occurring during sewage purification in treatment plants with different technological processes 总被引:2,自引:0,他引:2
J. Polak 《Water research》2009,43(17):4167-4176
The course of the humification process of sewage sludge collected from three biologic-mechanical treatment plants with different treatment technologies was studied. The maturity of sewage sludge and its usefulness for agricultural purposes was also discussed. The physical-chemical properties of humic acids extracted from sewage sludge received from comparable stages of sludge purification were described. Changes of the sludge properties during sewage purification and the progress of the humification process were investigated with EPR, IR and UV/VIS spectroscopic methods. The content of the elements and the carboxylic groups in humic acids extracted from each stage of the sewage treatment were also determined. It was found that the humification processes take place in all three treatment plants but with different intensities resulting from the differences in the individual cleaning processes in these plants. The most intensive changes of physical-chemical parameters in the extracted humic acids were observed in the anaerobic digester where mesophilic fermentation occurs. The sludge oxygenation processes also significantly affect the course of the humification process during sewage treatment. 相似文献
19.
Thickened wastewater activated sludge was treated in 13 pilot-scale sludge treatment wetlands of various configurations that operated continuously for three years in North Greece. Sludge was loaded for approximately 2.5 years, and the beds were left to rest for the remaining period. Three different sludge loading rates were used that represented three different population equivalents. Residual sludge stability and maturity were monitored for the last year. Sludge was regularly sampled and microbial respiration activity indices were measured via a static respiration assay. The phytotoxicity of sludge was quantified via a seed germination bioassay. Measurements of total solids, organic matter, total coliforms, pH and electrical conductivity were also made. According to microbial respiration activity measurements, the sludge end-product was classified as stable. The germination index of the final product exceeded 100% in most wetland units, while final pH values were approximately 6.5. The presence of plants positively affected the stability and maturity of the residual sludge end-product. Passive aeration did not significantly affect the quality of the residual sludge, while the addition of chromium at high concentrations hindered the sludge decomposition process. Conclusively, sludge treatment wetlands can be successfully used, not only to dewater, but also to stabilize and mature wastewater sludge after approximately a four-month resting phase. 相似文献
20.
Bis(2-ethylhexyl) phthalate (DEHP) concentrations were measured at different stages in a full-scale sewage treatment plant (STP) and mass balances were calculated. The DEHP load to treatment process coming from the sewer system and the internal load comprising returned supernatants and filtrate from sludge treatment and excess secondary sludge were at the same level. The DEHP removal efficiency from the water phase at the STP was on average 94% of sewage DEHP, the main removal process being sorption to primary and secondary sludges. On average 29% of DEHP was calculated to be removed in the biological nitrifying-denitrifying activated sludge process, which was much less than expected from laboratory biodegradation studies described in literature. Monoethylhexyl phthalate, the primary biotransformation product of DEHP, was not detected at any treatment stage. Approximately 32% of DEHP in sewage was removed during anaerobic digestion of the sludge, while 32% remained in the digested and dewatered sludge. 相似文献