Design Case Analysis of Stricter Discharge Standard for WWTP:Case of Industrial Park WWTP in Qingdao City
Many industrial enterprises are gathered in townships in Qingdao,so it is becoming more and more common for township waste water treatment plants(WWTPs)to accept both domestic waste water and industrial waste water.The recent design scale of the project is 3 000 m3/d,more than 2/3 of the influent water is industrial wastewater,the amount of multi-biology wastewater is 300 m3/d with a large number of non-biodegradable pollutant.While the effluent standard is quasi-Ⅳ standard(except TN),multi-biology wastewater is treated separately by pre-ozonation and then connected to biochemical system.The modified AAO+AO process is selected in the biochemical section.TN removal is achieved entirely in the biological pool,and high-efficiency sedimentation tank+ozone catalytic oxidation+sand filtration+contact disinfection process is used for the deep treatment,after the project is put into use.The removal rates of CODCr,TN and TP are 96.38％,86.97％and 98.70％respectively,the effluent quality can stably meet the design standards.This project can provide reference for the design of the same type of WWTPs.
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