城镇污水BOD测定方式浅析

Analysis on BOD Measurement Methods of Urban Sewage

标准反应条件下,BOD反应速率与水样中有机物种类、浓度、微生物种类及数量等有关,若水中微生物数量不够则需要接种;若水中含有大量硝化菌则硝化阶段会提前,需要添加硝化抑制剂防止硝化作用给检测带来正误差。为验证城镇污水中异养型好氧菌及硝化菌数量的影响,通过接种、不接种,及接种方式的对比,最终发现用氧化沟出水接种,且添加硝化抑制剂的方式最适合未经处理的城镇污水BOD的检测。

Under the standard reaction conditions,BOD reaction rate is related to the type and concentration of organic matter,the type and quantity of microorganisms in the water sample.If the quantity of microorganisms in the water is insufficient,inoculation is required.If there are a large number of nitrifying bacteria in the water,the nitrification stage will be advanced,and nitrification inhibitors need to be added to prevent nitrification from bringing positive errors to the detection.In order to verify the influence of heterotrophic aerobic bacteria and nitrifying bacteria in urban sewage,through the comparison of inoculation,non inoculation and inoculation methods,it was finally found that the method of inoculation with oxidation ditch effluent and addition of nitrification inhibitor was the most suitable method for BOD detection in untreated urban sewage.