污水厂出水及下游大沽排污河磷形态及浓度变化规律研究

为分析研究不同污水厂出水及下游排污河磷形态及浓度的变化规律,2014年3-8月对污水厂A、B出水及其排污河下游与大沽排污河5个点位水体中的总磷(TP)、溶解性总磷(TDP)、溶解性无机磷(DIP)、溶解性有机磷(DOP)、颗粒态磷(PP)进行了动态监测。结果表明,各点位水体均以DIP为主,污水厂A出水TP变化范围为0.27~2.31 mg/L,均值为1.04 mg/L,下游各形态磷浓度低于出水浓度,污水厂B出水TP浓度范围为0.10~3.12 mg/L,均值为0.49 mg/L,下游各形态磷浓度除DOP外均高于出水浓度。大沽排污河的总磷浓度变化范围为0.60~6.26 mg/L,均值为1.82 mg/L。其他外源磷输入对大沽排污河磷形态及浓度影响大于污水厂。

Study on change rule of phosphorus forms and concentration in sewage treatment plant effluent and Dagu Drainage River

Phosphorus data, including total phosphorous (TP), total dissolved phosphorous (TDP), dissolved inorganic phosphorous (DIP), dissolved organic phosphorous (DOP), and particulate phosphorous (PP), were collected at five sampling sites in the Dagu River below sewage treatment plants from March to August 2014. Changes in the phosphorus forms and concentrations in the sewage treatment plant effluent and downstream river water were analyzed. The results showed that phosphorus from all sampling sites mainly consisted of DIP. The concentration range for total phosphorus in the effluent sample from sewage plant A was 0.27 to 2.31 mg/L (mean of 1.04 mg/L), and concentrations of all phosphorus forms at the downstream drainage river sites were lower than that of sewage plant A's effluent. The concentration range for total phosphorus in the effluent sample from sewage plant B was 0.10 to 3.12 mg/L (mean of 0.49 mg/L), and concentrations of all phosphorus forms except for DOP at the downstream drainage river sites were higher than that of sewage plant B's effluent. The concentration range of total phosphorus in the Dagu River was 0.60 to 6.26 mg/L, with a mean of 1.82 mg/L. Thus, exogenous phosphorus inputs appear to be equally or more important than sewage plant effluents as contributors to phosphorus forms and concentrations in the Dagu River.