曝气生物滤池在酱油废水深度处理中的应用研究

Study of deep-level treatment of sauce-producing sewage by BAF

采用陶粒、活性炭混合填料的曝气生物滤池深度处理酱油废水,在不同的水力负荷条件下,以上向流的运行方式,研究了滤池对COD和色度的去除效果,用生物量(MLVSS)进一步证实了对污染物去除起主要作用的填料层高度范围。结果表明:陶粒与活性炭填装比例3:1,水力负荷0.75 m/h下,进水COD和色度为126 mg/L和155倍;出水COD和色度为43.8 mg/L和50倍,去除率分别达到了65.2%和68.6%,出水COD和色度优于废水综合排放标准(GB 8978—1996)的一级排放标准。污染物的去除主要发生在填料层0～65 cm高度范围内,微生物量也达到最大。

This paper is aimed at introducing our newly developed treatment of sauce-making sewage. As is known, sauce-making sewage is rich in COD concentration and high in color. Traditionally, application of the anaerobic reactor followed by an aerobic reactor for the sewage treatment is considered to be an effective method. But in recent years charcoal adsorption process is also regarded as an advanced treating technique. However, the latter is thought of as a method with the flaw of the color-return in the aerobic reactor, which usually leads to the increase of color and therefore fails to reach the national sewage treating standard. It is for this reason that has pushed us to apply ceramic and active carbon to the treating practice of the sauce sewage in this paper. In addition, ceramic and active carbon treatment belongs to tbe biological aerated filtering treating, which is good at the hydraulic condition, and active carbon is efficient in color removing. Also for this reason, we have studied the COD and color removal efficiency under different conditions and with different ratios of hydraulic load and the height of filling materials as up-flow current. In doing so, the main efficiency of pollutants responding to the height of filling materials was further acknowledged by MLVSS. The experimental results of ours show that under conditions of 1 ratio of ceramic and active carbon and hydraulic load 0.75 m/h, COD effluent concentration were likely to decrease from 126 mg/L to 43.8 rag/L, with the color decreased from 155 times to 50 times. At the same time, the removal efficiency of 65.2% COD and 68.6% color tended also to greatly improved and come up to the GB 8978-1996 advanced integrated sewage-treating standard. With the increase of the hydraulic load and the removal efficiency of COD, the color return period is surely expected to decrease; The removal rate of COD and MLVSS are extremely high, and reached 54.5 % . Besides, with the main efficiency of pollutant removal improved, the filter height of 65 cm, and MLVSS can also reach its maximum. Therefore, it can be concluded that the treating process can effectively be used for treating the industrial sewage with high COD concentration and colorreturn.