混凝-厌氧水解-SBR法处理中成药废水效能研究

On the efficiency of treating the Chinese traditional medicine sewage with the coagulation-anaerobic hydrolysis-SBR method

针对中成药生产废水高COD(化学需氧量)、高SS(悬浮物)、高色度、可生化性较低等制约常规单一处理方法效力的问题,采用混凝预处理-厌氧水解-SBR(序批式活性污泥法)生物反应器处理方法,研究其对中成药废水处理特性并探明此过程的污染物降解机理。首先,通过混凝参数正交试验以探明最佳工况:PAC(聚合氯化铝)质量浓度为800 mg/L,PAM(聚丙烯酰胺)质量浓度为3mg/L,搅拌强度为250 r/min搅拌1 min后以30 r/min连续搅拌30 min。该工况为有效降低后续废水生物处理的有机负荷,并保障其处理稳定性奠定良好基础。其次,通过耦合厌氧水解与SBR生物处理方法,使得中成药废水中COD、TP(总磷)、NH_(4)-N、TN(总氮)、SS去除率分别达90.24%、87.93%、93.94%、92.62%、97.30%。该耦合工艺通过各单元间的协同处理特性,实现了逐级高效污染物去除效力,为高浓度中成药废水的稳定处理提供了技术支撑。

This article is aimed to study the influence of the operating parameters of the coagulation and biological coupling process on the removal efficiency of COD,NH4-N,TP and SS in the sewage of the Chinese patent medicine.By changing the parameters in the coagulation test and treating practice,we have managed to obtain the optimal operating conditions of the coagulation and biological coupling process bioreactor test.In order to achieve the above said objectives,the coagulation test has first of all to conduct a single factor test,including the screening and dosage control of the PAC,Al2(SO4)3 and FeCl3 coagulants,mixing method of the PAM dosage and some other variables.And,subsequently,we have also managed to analyze the coagulation influential mechanism through the 3-factor 3-level orthogonal test and SPSS software.In the biological experiment,we have also adopted the reactor to change the proportional ratio of the Chinese patent medicine sewage in the influential water.And,finally,we have also investigated the removal effect of the system on the COD,NH4-N,TP,and SS via the physico-chemistro-biochemical coupling procedures.The results of the above test procedures show that the best coagulant dosage should be“800 mg/L PAC,3 mg/L PAM,with the best stirring method for the length of 250 r/min(continuing 1 min)and 30 r/min(continuing 30min)”.And,then,the removal effects of COD and SS can be made to reach 42.88%and 77.76%under the said condition.And,in turn,such measures can be made to lay a foundation to reduce the organic load of the subsequent anaerobic-SBR biochemical treatment and the resistance blockage of the reactor.On the other hand,the anaerobic hydrolysis and SBR reactors can also be made to operate successfully through 117 d and 97 d respectively,so as to stabilize the MLSS concentration rate at 7000-8000 mg/L and 4000-5000 mg/L,respectively.And,consequently,the final removal rate of COD,TP,NH_(4)-N,TN and SS in the effluent of the system can then be made to reach the percentages of 90.24%,87.93%,93.94%,92.62%,97.30%,correspondingly.Thus,it can be concluded that the coupled process is in a position to remove gradually the pollutants,such as SS and COD from the Chinese patent medicine sewage through the said physical and biochemical treatment to improve effectively as we;as to heighten the stability of the operation process and the effectiveness of the pollutant removal.