盐度升高对三种苯酚处理系统冲击的研究

Effects of Increasing Salinity on Phenol Biodegradation in Three Bioreactors

高含盐废水能使常规生物处理系统处理性能下降、甚至崩溃.以苯酚为基质,对SBR处理系统(A)以及两种接触氧化处理系统B,C(其中B使用自制粉煤灰微孔填料,C使用自制微孔玻璃填料)抗盐度冲击能力的研究表明,盐度突然升高到3%会使A,B,C三种系统的苯酚去除率分别下降87%,68%和74%;但短时间内三种系统都能恢复到加盐前的处理水平.以降解速率变化为依据,使用微孔填料的B,C处理系统抗盐度冲击能力大于A系统,且B,C系统出水平均浊度低于5NTU.在NaCl含量0～150 g·L-1下,苯酚生物降解速率对苯酚浓度均为0级反应,适当延长水力停留时间可以使苯酚完全去除.

Increasing of salinity can lead to the inactivation of microorganisms and deterioration of biotreatment processes.The effects of high salinity on three wastewater biotreatment processes, including one SBR reactor（A） and two contact oxidation processes using sintered fly ash microporous media（B） and microporous glass media（C） respectively, were studied. The results indicated that increasing of NaCl concentration from 0 to 30g·L^-1 suddenly could lead to 87% , 68% and 74% decrease in phenol remove efficiency respectively,and it needs three days for the malfunctional systems to recover to their original states. As acclimated to 30g·L^-1 NaCl, the three systems can tolerant NaCl concentration up to 70g·L^-1.With salt concentration changing from 0 to 150g·L^-1 biodegradation of phenol in all the three systems fitted zero-orderreaction with respect to the phenol concentration very well. As for phenol degradation rate, system B performed better to the increase of salinity than the other two,and the SBR reactor was most sensitive to the change of salinity.