复合耐盐微生物菌剂强化MBBR工艺处理高盐废水

在移动床生物膜反应器(MBBR)中接种SEM复合耐盐微生物菌剂,研究5%~10%盐度条件下悬浮填料的挂膜启动及其对高盐废水的强化处理效果.实验结果表明,MBBR在高盐环境下能够顺利挂膜,其挂膜效果受盐度及无机盐种类的影响:较高盐度下成功挂膜所需的周期更长,同一盐度下NaCl体系挂膜效果优于Na2SO4体系.MBBR处理羧甲基纤维素生产废水效果优于活性污泥法:进水盐浓度均为5%~7%,当进水COD 5 343 mg/L时,MBBR出水COD小于300 mg/L,经絮凝后低于100 mg/L,容积负荷高达2.67 kg COD/(m3·d),而活性污泥法在进水COD 3 563 mg/L时,出水COD小于400 mg/L,经絮凝后低于150 mg/L,容积负荷仅为1.68 kg COD/(m3·d).MBBR生物膜处理体系稳定性及去除能力更高,能够抵抗较高盐度范围波动、有机负荷等的冲击.

Treatment of high salt wastewater in MBBR process strengthened by complex salt-tolerant microorganism

The complex salt-tolerant microorganism was inoculated into moving bed biofilm reactor(MBBR) in order to study the startup methods of biofilm formation and investigate the removal efficiency of MBBR for high-salt wastewater with the salinity of 5%~10%. The results showed that the biofilm could be cultured successfully in high salt environment. The startup process of MBBR was affected by salinity and types of salt: the biofilm forming cycle required more time at higher salinity, and the effect of biofilm forming in NaCl system was better than Na2SO4 system at the same salinity. The aerobic MBBR and activated sludge process were used for treatment of carboxymethyl cellulose wastewater, the MBBR had a better treatment effect in the salinity of 5%~7%. When influent COD was 5 343 mg/L in the MBBR, the effluent COD was below 300 mg/L,the final effluent COD was below 100 mg/L after flocculation, the volumetric loading could reach 2.67 kg COD/(m3·d). When the influent COD was 3 563 mg/L in the activated sludge process,the effluent COD was below 400 mg/L,the final effluent COD was below 150 mg/L after flocculation, the volumetric loading was only 1.68 kg COD/(m3·d). Compared with the activated sludge process, the MBBR had the strong stability and removal efficiency, it could resist the impacts of high salinity fluctuation, organic loading and so on.