文章基本信息

标题：Analysis concerning the biological treatment of wastewater with high concentrations of ammonia nitrogen
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作者：Ioan Mircea Cr.ciun ; Grigore Vlad ; DanielaIgnat 等
期刊名称：Advances in Environmental Sciences - International Journal of the Bioflux Society
印刷版ISSN：2066-7620
电子版ISSN：2065-7647
出版年度：2015
卷号：7
期号：2
页码：163-172
出版社：Bioflux
摘要：The treatment of th e domestic wastewaters in one biological treatment step with active sludge is limited by the practical treatment efficiency, which is max. 93%. This efficiency can provide satisfactory treatment when the wastewaters do not exceed the values from NTPA 002/2 005. In case of the wastewaters that extensively exceed the values from the regulation standards and especially at the ammonia nitrogen indicator, the total efficiency called for tends to be 98% and cannot be optimally provided in one biological step, irre spective of the process applied. In this paper we set out a treatment technology in two biological steps, for domestic wastewaters with high concentrations of ammonia nitrogen, which provides an up to 98% total treatment efficiency, alongside a reduction o f the specific oxygen demand from 4.3 kg O 2 /kg CBO 5 , as necessary for one treatment step, to 1.4 kg O 2 /kg CBO 5 , as needed in the two steps variant, and a reduction of the constructive equivalent total volume to 50%. The first step of biological treatment c hosen is with high load aeration, where the sludge organic load ranges between 1.5 and 2 kg CBO 5 /kg dry matter /day, and the second step of biological treatment with a full mixture, where the sludge organic load is between 0.2 and 0.6 kg CBO 5 /kg dry matter / day. We will highlight the resemblances and the differences versus the known treatment processes, as well as the advantages and the disadvantages of the method on a practical application
关键词：biological treatment; organic load; efficiency; ammonia n ; itrogen