Study on the Effect of Polyaluminum Chloride Strengthening Sewage Treatment in Certain Hospital
In this paper,the effluent from the secondary sedimentation tank of a hospital was selected as the research object,and polyaluminum chloride(PAC)was selected as the coagulant.The influence of dosage and pH on the treatment effect was investigated through beaker experiment to simulate the actual operating conditions.The research results show that when PAC dosage is 25 mg/L,effluent TP can reach first grade B standard and CODCr can reach first grade A standard in Pollutant Discharge Standard for Urban Sewage Treatment Plants(GB 18918-2002).The removal effect of NH3-N can only reach the second grade standard.Alkaline conditions are beneficial to the removal of UV254,and the best pH for TOC removal is 5 in the effective pH range of PAC,and the removal rate of TOC increases with the increase of PAC dosage.The influence of pH value on SUVA is mainly achieved through the removal of organic matter with ultraviolet absorption properties in water,while the dosage of PAC is mainly affected by the removal of humus and organic matter with carbon-carbon double bond and aromatic ring structure in water.
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