Study On Treatment Of High-concentration Acrylic-acid Wastewater By Multi-stage Microaerobic Biological Fluidized Bed And UASB Process

Tlae effect of Bio-filter System which uses carbonation sludge carrier removing pollutants from micro-polluted source water was studied. Research results were as follows.It is appropriate to adopt ammonia nitrogen removal rate 60% as a basic mark to judge mature biotilrn. After the biofilm formation. Bio-filter had a high rate on removing CODMn-. NH4+-N and turbidity. The maximum removal rate of CODMn. NH4+-N and turbidity were 41.70%, 79.89% and 84.11 %.When the Empty bed contact time (EBCT) was 12 min. the gas to water ratio (G/W) was 1.0, the temperature was 20.2℃~26.5℃,pH was 6.8~7.9 and the system was operated steadily, the removal efTect of pollutants by Bio-filter System which uses carbonation sludge carrier were as follows: the average removal rate of CODMn-, UV254. NH4+-N, NO2--N, turbidity and chroma were 46.19%. 32.34%. 80.48%. 83.25%. 87.69% and 73.56% respectively. Under the same condition. CODMn-. NH4+-N turbidity and chroma were used as the evaluation objects by the use of performance evaluation index of Bio-filter. It can he conclued that the performance of Bio-filter System using carbonation sludge carrier was best.Influence of EBCT, G/W, water temperature, organic volurnatric loading. NH4+-N volume loading on Bio-filter system performance were analyzed. When the CODMn was less than 6mg/L,the NH4+-N volume loading was less than 2mg/L. EBCT was 12 min and G/W was 1.0. the Bio-filter could have a better effect. By use of orthogonal. the result showed that the degree of each factor were G/W. EBCT and volumairic loading on the CODMn- removal. The degree of each factor were EBCT. G/W and volumatric loading on the NH4+-N removal.The relation between operation characteristics and filter height of the Bio-filter was studied. The removal of CODMn turbidity and chroma were mainly occurred in 0-40 cm. The removal of UV254 was mainly occurred in 0-60cm. The removal of NH4+-N was mainly occurred in 20-60cm. Thus the Bio-filter height of 100cm used can make emuent meet the requirement.When EBCT was 12 min. G/W was I.0 and the temperature was 20.2℃~26.5℃, volumic load of 8.0-9.0kg/(m3.d).