| With the growth of economy and population, the demand for water resources isincreasing and the water quality is worsening, and the water pollution is increasingseriously. In recent years, with the rapid development of Chinese petrochemical industry,a large coal chemical project is completed and a large number of chemical wastewaterdischarge caused by environmental pollution. Therefore, chemical wastewater is treatedand recycled to become the primary task for the coal chemical project.The topic for the methanol project in the wastewater treatment plant for PuchengClean Energy Chemical Co., Ltd. had been studied, and examined the physical andchemical characteristics of Pu-SBR Process methanol plant wastewater and determinedthe technical parameters of the process route and kind of wastewater treatment. Themain results are as follows:(1) SBR tank was designed to simulate the CASS process reference, the front of themain reaction zone of SBR tank increased the pre-reaction zone, also called biologicalselection area. Pre-reaction zone volume accounted for20%of each grid cell SBR.(2) In the start-up phase of the sewage system, PAC dosage and SS removal ratewas proportional relationship, and determined the optimum dosage of PAC dosage was60mg/L; After pretreatment, SS concentration was down to20mg/L, SS removalefficiency reached80%, CODcr concentration was maintained at55mg/L, ammoniaconcentration is less than15mg/L, pH at7.5-9.0. Water indicators meet the "YellowRiver basin (Shaanxi section) Integrated Wastewater Discharge Standard" an AStandard.(3) In normal operation phase of the sewage system, the main change in the processfor the microbial denitrification of ammonia. In the denitrification process, itinvestigated the influence of COD, SS, DO, MLSS and other parameters. The results show: DO concentration from start to finish was less than0.5mg/L, MLSS was in2500mg/L-3000mg/L. The final pH was maintained at about7.3. In the process ofnitrification and denitrification biological nitrogen removal is better. In thedenitrification process, SBR tank control nitrogen ratio of2.5. Ammonia effluent can bereduced to12mg/L. These indicators fully meet the effluent standards. |
