EGSB反应器处理高浓度豆制品废水的研究

TREATMENT OF HIGH STRENGTH SOYBEAN PROCESSING WASTEWATER WITH ANAEROBIC EGSB REACTOR

在中温(32～37℃)条件下,采用小试规模膨胀污泥床(EGSB)反应器处理高浓度豆制品废水(污水COD为1000～13000mg·L-1),连续运行180d,研究了进水COD、有机负荷(OLR)以及水力停留时间(HRT)等因素对废水处理效果的影响。研究利用好氧污泥接种成功培养出了高活性的厌氧颗粒状污泥。结果表明,EGSB反应器处理高浓度食品废水能够达到很好的效果,当进水COD有机负荷为2～6.75kg·m-·3d-1,HRT为48h时,COD、BOD5去除率为85%左右;当进水COD为10000mg·L-1,最佳HRT为24h,此时相对应的OLR约为10.2kg·m-·3d-1。稳定运行期间,厌氧反应器消耗每克COD的CH4产率为0.08～0.14L·g-1,甲烷含量为60%～75%。试验达到了较好的处理效果和较高的产气率,表明应用EGSB处理高浓度豆制品废水是高效、可行的。

A laboratory-scale expanded granular sludge bed （EGSB） reactor treating high strength soybean processing wastewater （COD was 1 000～ 13 000 mg·L-1） was operated at mesophilic condition （32～37 ℃） for over 180 days. The effects of organic loading rate（OLR）, hydraulic retention time （HRT） and other factors on the system performance were investigated. Aerobic sludge was initially inoculated in bioreactor and gradually cultivated to anaerobic granular sludge after 2 months operation. Under tested OLR of 2～6.75 kg·m-3·d-1 and HRT of 48 h, COD and BOD5 removal efficiencies of over 85% were achieved. The optimal HRT was found to be about 24 h at 10 000 mg·L-1 feeding （OLR was about 10.2 kg·m-3·d-1）. During stable operational periods, approximate 60%～75% methane was found in the biogas with an overall methane yield of 0.08～0.14 L·g-1 . The results indicate that treatment of high strength soybean processing wastewater with EGSB reactor is efficient in terms of organic removal efficiency and biogas yield.