Comparative Study on Purification Effect of Different Disinfectants on Laying Duck Farming Wastewater
In order to explore the purification effects of different disinfectants(povidone iodine and chlorine dioxide)on wastewater from medium to large-scale egg duck farms,the changes of chemical oxygen demand(COD),number of Escherichia coli,total number of bacteria,ammonia nitrogen(NH3-N),and pH value in the water were detected after 0(control group)2,8,26 and 32 h of disinfection.The results showed that compared with the control group(after 0 h of disinfection),the COD content,total bacterial count,pH value and the number of Escherichia coli were all significantly decreased after disinfection with povidone iodine for 2 to 32 h(P<0.01),and the NH3-N content was also significantly decreased after disinfection for 32 h(P<0.05).Similarly,after disinfection with chlorine dioxide for 2 to 32 h,the total number of bacteria,the number of Escherichia coli,and pH value were all significantly decreased(P<0.01),but the NH3-N content was significantly increased(P<0.01).Compared to povidone iodine,after disinfection with chlorine dioxide for 2 to 32 h,the total number of bacteria significantly decreased,and after disinfection for 8 h(P<0.05),the number of Escherichia coli significantly decreased(P<0.05).Compared with povidone iodine,using chlorine dioxide to purify wastewater could significantly reduce feeding costs.The results indicated that chlorine dioxide was a more optimal disinfectant choice breeding cost of laying duck farms and key indicators in breeding production(total number of bacteria and Escherichia coli).
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