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超声波对污泥脱水及厌氧消化影响的研究进展 总被引:1,自引:0,他引:1
超声波技术作为污泥厌氧消化预处理手段被广泛关注.超声波能改变污泥的性质,改善污泥厌氧消化的性能,但是其处理效果受到频率、强度、作用时间和发生方式等因素的影响,只有在合适的条件下,预处理效果才能达到最佳.本文着重介绍了超声波的频率、强度、作用时间和发生方式对污泥脱水性能、污泥沉降性能、微生物活性和污泥产气等多方面的影响.由于脱水性能和厌氧消化的改善所需要超声波的条件不一样,所以有必要通过进一步实验使预处理效果最优化;同时,为了进一步降低能耗,有效利用超声波与其它预处理技术相结合将是未来的研究方向. 相似文献
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研究了超声波、絮凝剂、超声波联合絮凝剂强化污泥脱水的效果。结果表明,单独采用超声波处理时,双频超声波的污泥脱水效果优于单频超声波;单独絮凝剂处理时,硫酸铝的污泥脱水效果优于硫酸铁和聚丙烯酰胺。超声波联合絮凝剂处理时,投加硫酸铝和超声波处理同时进行的污泥脱水效果最佳,正交回归优化超声时间(X1)、絮凝剂投加量(X2)、超声功率(X3)三者之间的线性关系为Y=0.864+0.13X1+0.09X2+0.01X3+0.03X1X2。 相似文献
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从油田中含油污泥的成分及危害分析入手,阐述了油田含油污泥处理中的超声波与厌氧反应技术。在此基础上,以大庆油田含油污泥作为研究对象,通过实验的方法验证了超声波预处理—厌氧产甲烷的效果。期望能够对油田含油污泥的处理和产甲烷效果的提升有所帮助。 相似文献
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超声波-复合絮凝剂对石化厂剩余污泥脱水的研究 总被引:3,自引:0,他引:3
以污泥含水率为考察指标,研究了超声波-复合絮凝剂对石化厂剩余污泥脱水效果的影响.实验结果表明,复合絮凝剂的脱水效果优于单一絮凝剂;污泥采用复合絮凝剂PAM-PAFC进行絮凝脱水,在投加质量浓度190 mg/L、m(PAM)∶m(PAFC)=1∶1条件下,再经20 kHz、400 W/m2超声处理2.5 min后,污泥含水率从97%降至79%,污泥体积缩小86%左右,比仅投加PAM处理时污泥含水率降低5%左右.可见,超声波-复合絮凝剂可以强化污泥脱水,在提高污泥脱水效果的同时,减少了有机絮凝剂PAM的用量,降低了污泥处理成本. 相似文献
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《化工进展》2017,(3)
污泥膨胀和大量的剩余污泥是当前城市污水处理厂面临的重要问题。采用20k Hz超声波,在不同的声能密度和超声时间下处理微膨胀活性污泥,研究低能量密度超声波处理对活性污泥的沉降性能及污泥减量的影响。结果表明:超声波处理可改善污泥沉降性能和实现污泥减量。适宜的超声处理时间为30~40s。超声处理后,泥水界面沉降速率可提高52%,污泥容积指数(SVI)可由202.9m L/g下降到151m L/g左右,污泥减量率为12.5%。在超声波处理40s时污泥减少已基本完成,而上清液的溶解性化学需氧量(SCOD)在40s之后还在大幅升高,从絮体中释放出来的污泥的溶解液化相对滞后。在一定范围内增加超声处理时间和提高超声能量密度有利于污泥减量效果的提升。活性污泥的初始p H对超声处理效果的影响不大。污泥初始浓度对污泥减量效果影响较大,采用超声波处理较高浓度的污泥时,污泥上清液SCOD增加值在25~29mg/g SS之间。 相似文献
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目前我厂含油污泥采取定点存放的方法,虽减轻了污染问题,但是治标不治本。该研究项目针对油田含油污泥日益增加带来的环境问题,引进先进的物理和生物处理技术,并根据油田实际情况优化和集成了处理工艺。通过超声波产生的空化效应对高含油污泥进行洗脱,减轻生物处理段的处理负荷的同时也回收了石油资源;生物处理后植物种植技术的引入,使含油污泥彻底达到无害化处理。该实验的成功将为油田含油污泥的无害化处理找到一条新的出路,为油田环境保护作出新的贡献。 相似文献
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随着经济的发展和国民生活水平的提高,污水污泥的排放量逐年增加,环境问题愈发严重,污泥的处理处置成为焦点问题,污泥脱水是制约污泥处置处理进一步发展的关键。本文针对目前污泥深度脱水技术开展,首先简述了不同来源污泥的分类及其基本特性,然后重点阐述了不同污泥预处理技术,分析了各污泥深度脱水技术作用机理,并对各自脱水效果及优缺点进行比较分析。结果表明,物理法中水热预处理对污泥的可脱水程度提升最大。较低声强、短时间的超声波处理对污泥脱水性能有着明显的改善。化学法在污泥过滤性能以及脱水速率方面有很大优势,酸碱处理后污泥zeta电位上升,污泥过滤性能及脱水速率得到改善。高级氧化法处理后污泥脱水效果高于酸碱处理,微生物细胞被溶解释放出有机物,可脱水程度改善。生物法处理污泥除改善污泥脱水性能外,还有对环境污染小等特点,但耗时较长。最后对污泥的后续脱水工艺进行综述,介绍了现存的主流脱水工艺,包括机械脱水、热干化技术、水热脱水工艺等;并针对不同的污泥后续利用方法,选取合适的预处理技术,提出相应优化的污泥处理工艺流程。 相似文献
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Maria Wlodarczyk-Makula 《Polycyclic Aromatic Compounds》2013,33(2):183-194
Abstract Sewage and sewage sludge from a municipal wastewater treatment plant were analyzed for 16 EPA-PAHs. This plant is a classic mechanical-biological treatment plant, consisting of activated sludge technology with additional chemical treatment for the removal of phosphorus compounds. The process of sewage sludge treatment is carried out in closed as well as open sludge digesters. Primary and mechanically thickened sludge are passed through the fermentation process. Digested sludge is dewatered on filter-press through addition of flocculent. The measurements were obtained to investigate the effect of different treatment stages on PAH content in wastewater and sewage sludge. The following wastewater samples were collected: crude ones and those after sand trap, primary sedimentation, biological treatment and secondary sedimentation. Sewage sludge samples were collected from: primary sludge, digested sludge and dewatered sludge. PAH load in influent, mechanically and biologically treated sewage, as well as in raw digested and dewatered sludge, were calculated. PAHs were extracted from wastewater and sludge samples, with cyclohexane, dichloromethane using an ultrasonic method. Gas chromatograph equipped with mass spectrometry was used for qualitative and quantitative determination of PAHs. Mechanical and biological treatment proved the removal of 83–85% of PAHs from the influent. Despite this its daily PAH load introduced into the environment was high and reached 27–37% of PAH load in influent. In sewage sludge it was 46–70 g/d of PAHs (carcinogenic PAHs content 4–12%). In waste sludge (filter pressed sludge and sand from detrirer) PAH total load reached 42–68 g/d with (10–17% of carcinogenic PAHs). 相似文献
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超声波技术与污水污泥及难降解废水处理 总被引:48,自引:3,他引:45
超声波技术作为一种新的污染治理技术正日益受到人们的重视,其在强化污水污泥处理及有毒有害和难降难有机废水处理方面已显示出巨大潜力。该文综述了超声波技术在污水污泥及难降解废水处理中的研究现状。 相似文献
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随着我国城市化进程的加快,污水处理厂的脱水污泥产量急剧增加,国内一些城市开始脱水污泥处理。结合浙江圣雄皮业有限公司污泥处置工程选择的污泥焚烧工艺,介绍了污水处理厂脱水污泥的性质、污泥焚烧的工艺流程,同时简要给出了投资及运行费用方面的情况。此项目的实施对于浙江圣雄皮业有限公司的可持续发展、树立企业良好的环保形象具有十分重要的意义。 相似文献
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污水污泥的处理、处置与资源化 总被引:1,自引:1,他引:0
近几年来,在中国的污水处理工作取得快速进展的同时,污水处理厂的污泥问题也在日益突出。污水污泥量显著增加,伴随着污泥填埋用地日益紧张、污泥处置带来的环境问题引起了普遍关注,各政府部门和环境学专家也在积极的采取对策来解决日益严重的污泥污染问题。文章主要对污水污泥处理与处置技术路线中的主要处理与处置方法进行分类介绍。 相似文献
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Investigations were carried out on the effect of the ultrasonic field and some selected chemical compounds on the process of preparing sludges to be dewatered by mechanical devices.
The tests; were performed in a laboratory on real sludges. The processes occurring in sludges due to presence of ultrasonic field and applied chemical reagents were determined on the basis of a commonly used method of determining the sludge dewatering, in both filtration and sedimentation.
The interdependences of value changes of the above mentioned factors and the possibilities of applying ultrasonic waves to intensifying sludge dewatering process were examined. The obtained results confirm the applicability of ultrasonic waves to the process of sludge treatment and prove that the initial assumptions concerning the use of ultrasonic field in the suspension separation methods to be valid. 相似文献
The tests; were performed in a laboratory on real sludges. The processes occurring in sludges due to presence of ultrasonic field and applied chemical reagents were determined on the basis of a commonly used method of determining the sludge dewatering, in both filtration and sedimentation.
The interdependences of value changes of the above mentioned factors and the possibilities of applying ultrasonic waves to intensifying sludge dewatering process were examined. The obtained results confirm the applicability of ultrasonic waves to the process of sludge treatment and prove that the initial assumptions concerning the use of ultrasonic field in the suspension separation methods to be valid. 相似文献
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Investigations were carried out on the effect of the ultrasonic field and some selected chemical compounds on the process of preparing sludges to be dewatered by mechanical devices. The tests; were performed in a laboratory on real sludges. The processes occurring in sludges due to presence of ultrasonic field and applied chemical reagents were determined on the basis of a commonly used method of determining the sludge dewatering, in both filtration and sedimentation. The interdependences of value changes of the above mentioned factors and the possibilities of applying ultrasonic waves to intensifying sludge dewatering process were examined. The obtained results confirm the applicability of ultrasonic waves to the process of sludge treatment and prove that the initial assumptions concerning the use of ultrasonic field in the suspension separation methods to be valid. 相似文献