Treatment of high concentration phosphorus-containing wastewater by chemical precipitation

Precipitation process with calcium chloride as the precipitant was used to treat high concentra-tion phosphorus-containing wastewater,the effects of calcium chloride dosage,pH value,reaction temperature and reaction time on phosphorus removal were investigated.The results showed that,calcium chloride had good removal ability for phosphorus,when the n(Ca) ∶ n(P) was 1.5 ∶ 1,the pH value was 9.50,the reaction temperature was 25 ℃,the reaction time was 30 min,the removal rate of phosphorus reached 99.90%.