使用差压计测定低值BOD5

污水处理厂活性污泥经过洗涤后,在5 d的时间里其内源呼吸耗氧量线性较好,可以采用处于内源呼吸阶段的活性污泥作为BOD5测定的载体,一方面能够确保测定初期快速启动,另一方面能够提高测量范围,从而减小仪器的系统误差.活性污泥经过洗涤去除吸附的有机物后,将其制成浓度为200 mg/L左右的接种溶液用于低值BOD5测定,测量结果介于采用稀释法测定和差压计直接测定结果之间.当水中BOD5较低时,可以使用本方法进行测定,为测定低值BOD5提供一种新思路和新方法.

Study on Lower BOD5 Measurement by Respirometry

There is a large deviation to measure lower BOD5 of wastewater treatment plant using standard method and respirometry method. 5 days respiration of sludge endogenous has good linearity, what enlarges the lower measurement value by washing sludge. When the MISS is 200 mg/L, lower BOD5 is achieved ideally measure result by contrasting with standard method.