高硫抗生素废水微好氧连续处理系统的进水负荷效应研究

在14~18℃条件下探讨了不同进水负荷对高硫抗生素废水微好氧连续处理系统的处理效果和污泥中细菌、酵母菌含量的影响.结果表明,在低负荷COD=2 kg.(m3.d)-1]条件下,污泥以细菌为优势菌群(细菌含量为96%),污泥浓度和污泥脱氢酶活性(TF/MLSS.t)分别为300 mg.L-1、4300 mg/(g.h),污泥SVI=35 mL.g-1,COD去除率仅为13%;当升高负荷至初始负荷的5倍和10倍时,污泥中以酵母菌为优势菌(酵母菌含量分别为67%和71%),污泥浓度分别为2300、1500 mg.L-1,污泥DHA活性(TF/MLSS.t)分别为9600、10800 mg/(g.h),污泥SVI值分别为160、110 mL.g-1,COD去除率升高到40%~50%,进水负荷对污泥微生态构成和系统处理效果均具有显著影响.

Performance of Micro-aerobic Continuous Treatment System for Sulfate-Ridden Antibiotic Wastewater at Varied Influent Loadings

Performance of a lab-scale micro-aerobic continuous treatment system for sulfate-ridden antibiotic wastewater, I.e., the treatment efficiencies,sludge SVI values and DHA activities,and the contents of yeasts and bacteria in sludge,were investigated at 14-18℃ when varied influent loadings COD of 2-21 kg/(m~3·d) were used. At an influent loading COD of 2 kg/(m~3·d) , bacteria were preponderant in the microbial community in the sludge with a content of 96% , the sludge had MLSS, DHA activity (TF/MLSS·t), and SVI levels of 300 mg- L~(-1), 4 300 mg/(g·h) ,and 35 mL·g~(-1), respectively, the system achieved a COD removal of 13% .When the influent loadings went up to 5 and 10 times higher than that at the first phase,I.e. ,9 and 21 kg/(m~3·d),it was yeasts' turn to be preponderant in the sludge with contents of 67% and 71% .respectively,the MLSS levels amounted to 2 300 and 1 500 mg·L~(-1) respectively, the DHA activity (TF/MLSS·t) of 9 600 and 10 800 mg/(g·h) ,and the SVI values of 160 and 110 mL·g~(-1) ,were achieved individually,the COD removal was greatly improved up to 40%-50% . It showed that influent loadings had remarkable influence on the treatment performance and microbial community structure of the system.