At present,the phosphorus removal in sewage treatment process is mainly based on anaerobic-anoxic-aerobic (A2/O) process.However,the A2/O process cannot achieve the removal of non-orthophosphates.Thus,emergency measures to remove non-orthophosphates in sewage are very necessary.In this experiment,the research on the emergency removal of total phosphorus in sewage was carried out.Traditional Fenton oxidation,ozone-traditional Fenton oxidation,sodium hypochlorite (NaClO) oxidation were compared.The results indicated that sodium hypochlorite oxidation was a more practical method.By exploring a series of oxidation conditions,it was concluded that when 10 mL of NaClO with mass fraction of 5.5% was added,the oxidation time was 30 min,the oxidation stirring speed was 60 r·min-1,the dosage of coagulant was 0.2 mL,and the coagulation time was 20 min,the stirring speed was 300 r·min-1,the slow stirring time was 10 min,the slow stirring speed was 60 r·min-1,the dosage of polyacrylamide with mass fraction of 0.1% was 0.2 mL,the coagulation time was 30 min,and the coagulation stirring speed was 60 r·min-1,the oxidative removal rate of non-orthophosphate was the highest.The development of this experiment can be used as an important auxiliary method of the A2/O process to ensure that the water quality of the effluent reaches the standard when the concentration of non-orthophosphate is high.
关键词
总磷/非正磷酸盐/应急处理/化学氧化/混凝法
Key words
Total phosphorus/Non-orthophosphate/Emergency treatment/Chemical oxidation/Coagulation method
维普
万方数据