Advanced Treatment On Secondary Effluent From Municipal Wastewater Treatment Plant By Ozone And GAC

With the development of human being society, the contradiction of water demandincreasing and water shortage became more obvious. From this point of view, reusingthe effluent of advanced treatment process for secondary effluent was a effetctive wayto solve this problem.As we all known, the effluent of municipal sewage plant was the ideal supplementwater resource. However, the effluent from advanced treatment process contains someresidual trace pollutants, which was harmful to human being health and environment.Therefore, the removal effect of regular water quality indices in secondary effluent byadvanced treatment process and the controlling technology of trace pollutants insecondary effluent were all needed to be researched by us.In this paper, the treatment process of contact filtration+ozonation and contactfiltration+GAC adsorption were applied to treat the traditional pollutants and6β-lactamantibiotics from secondary effluent of municipal wastewater plant. Determinating theoptimal operation parameters of ozonation and GAC adsorption by the removal effect ofwater quality indices in different operation conditions, and the elaboration was made bydynamic principle for removal rate of trace objected drugs with the two aforementionedtreatment processes. The results revealed that, the optimal control parameters of ozoneprocess was: the concentration of O3was8mg/L and the time was20min; the optimalcontrol parameters of GAC adsorption process was: the height of GAC was75cm andthe time was10min. The dynamics degradation process of6β-lactam antibiotics wasalso analyzed, the results showed that, when the concentration of O3was8mg/L, theoxidation rate of6β-lactam antibiotics descending order was cefaclor, ceftazidime,cefazolin, ceftriaxone, procaine hydrochloride, cefotaxime; when the height of GACwas100cm, the adsorption rate of6β-lactam antibiotics descending order wasceftriaxone, cefazolin, cefaclor, cefotaxime, procaine hydrochloride, ceftazidime.The aforementioned optimal operation parameters were applied to research theremoval effect of trace pollutants by using the contact filtration+ozonation+GACadsorption process. The results showed that when tubidity, CODCr, UV254, TOC,6target drugs, TN, TP, microorganism in secondary effluent were1.51².14NTU,23.4³6.1mg/L,0.095⁰.109cm^-1,8.339¹0.510mg/L,0.703⁴.631μg/L,11.28¹4.43 mg/L,1.18².21mg/L,1.8×106⁶.7×106cfu/L,1.0×105².2×105cfu/L, and the averageremoval rate of tubidity, CODCr,UV254, TOC,6β-lactam antibiotics, TN, TP,microorganism were92.29%,80.03%,92.48%,74.16%,67.59%⁸3.85%,53.38%,49.87%,99.99%,99.99%with this combined process.