A development research of activated sludge process without excess sludge using electrolytic process

（1）目的本研究的目的是建立回收废水中镍、磷、有机物和氨的处理技术，以及为该技术的商业化所必需的处理厂的设计和操作指南。处理和处置费用巨大。在这项研究中，没有剩余污泥的活性污泥法是利用电解过程，将剩余污泥转化为基质，并返回到厌氧消化系统。（2）原理。微生物（剩余污泥）被电化学产生的氯（次氯酸）杀死，并返回曝气池。被杀死的微生物通过细菌溶解被其他微生物消灭，同时容易分解的物质被立即消化。 ...更多信息 难溶物质如细胞壁成分的长时间消化。（3）结果污泥中加入1%的NaCl，以IrO_2涂层钛为阳极板，钛为阴极板，在3.0V、1.0A、搅拌下电解10min，微生物的杀灭率接近100%。对氯化钠用量和电解条件进行了优化。在SRT为20天的曝气池负荷下，污泥基质回流可使曝气池负荷增加约20%。MLSS增加到对照的16%。将细胞壁组分消化数天。消化污泥基质的细菌驯化需要几个月的时间。与对照组相比，处理后的出水BOD基本持平，COD和TOC略有上升。建立了无剩余污泥处理系统，并通过一年的连续运行验证了该系统的可行性和稳定性。（4）建议在今后的研究中，在技术认可后，与民营企业合作，在公共污水处理设施中进行示范实验，将该技术商业化。少

(1)PurposeThe purpose of this study is the establishment of the processing technology to recover nickel and phosphorus, organic substance and ammonia for the wastewater, and the guideline of design and operation of the processing plant necessary for the commercialization of this technology.The sludge, which arises from treatment plants of domestic and industrial wastewaters, occupies the maximum proportion in the industrial wastes, and the enormous costs are spent for its treatment and disposal. In this study, the activated sludge process without excess sludge was developed using electrolytic process that converts the excess sludge into the substrate and is returned to the aerator.(2)Principle.The microorganisms (excess sludge) are killed by chlorine (hypochlorous acid) created electrochemically, and it is returned to the aeration tank. The killed microorganisms are extinguished by the other microorganisms through the bacteriolysis with the immediate digestion of the easily decomposabi … More lity materials and the long time digestion of refracoty substances such as the cell wall components.(3)ResultsThe sludge was added with NaCl to be 1% and converted to the substrate by the electrolysis process for 10 minutes at 3.0V and 1.0A under agitation with anode plate of IrO_2 coat titanium and cathode plate of titanium.The killed rate of the microorganism by the electrolysis was almost 100%. The process operation was optimized for NaCl dosage and electrolysis condition. About 20% increase by the return of sludge substrate was estimated for the load of the aeration tank with SRT of 20 days. MLSS was increased up to 16% of that in the control. The cell wall components were digested for several day. Several months were needed for the domestication of bacteria concerning the digestion of the sludge substrate. When the process water quality was compared with the control, BOD was same level, and COD and TOC increased a little. The treatment system without the excess sludge was established, and the workability and stability of the system were confirmed through continuous operation for one year.(4)ProspectIn the future research, the demonstration experiment is necessary to be carried out in the public sewage treatment facility by cooperating with the private enterprises to commercialize this technology after the technology recognition. Less