Research On The A/O Process For Treatment Of Slaughterhouse Wastewater

The slaughterhouse wastewater is a kind of typical industrial wastewaterwith the following characteristics: high concentration of organic matter; highconcentration of ammonia and high concentration of suspended solid. Ifslaughterhouse wastewater was directly discharged, a seriously bad influencemight be caused to the environment.Therefore, slaughterhouse wastewatermust be treated to meet certain criteria before discharge.The technology of biological treatment is widely adopted to treatslaughterhouse wastewater. The technology according with the principles ofsustainable development for wastewater treatment can save energy and alsogenerate energy. Therefore, the development and application of the A/O(anaerobic/oxic) technology is highly rapid. And the A/O technology isdesigned based on the theory of biological oxidation techniques. However, theintegrated biological technology can not reach the effluent standard ofwastewater.In the present study，the treatment of slaughterhouse wastewaterwith A/O technology is assessed based on its removal efficiency of SS, TN,NH+4-N, NO-3-N, TP, CODCrand BOD5.The results of the treatment were obtained from the experiments for sixmonths. Comparison of experimental results for the influent and effluentshowed that the A/O process and flocculation could remove most of the SS,with a removal rate of84%. The average concentration of COD in the effluent was87.26mg/L and the removal rate of COD was89%. The average removalrate of TN, NH+4-N and TP in slaughterhouse wastewater treatment by theA/O technology were22%,56%and80%, respectively. The removal ofNO-3-N was not obvious. The effect of the treatment on pollutants was provento be steady. The results showed that removal efficiency of SS and COD werebest and the treatment of TP, NH+4-N and TN should be optimized. In addition,principal component analysis (PCA) method was used to analyze thepollutants in influent and effluent of slaughterhouse wastewater.This thesis proposes an approach to explore the best conditions forwastewater treatment based on the addition of bacterial agent in simulationexperiment in laboratory. Results showed that the amount of bacterial agent isobviously preponderant at the range of0.025~0.05g/L for the removal of TN,NH+4-N and TP.