[Objective] The research aimed to study influence factors of phosphorus removal by chemical method in sewage treatment system.[Method] In different reaction systems,removal effect of the phosphorus in sewage by dosing lime and influence of the constraint factor were studied.[Result] Lime precipitation method treating high-concentration phosphorus wastewater could not only decline cost of phosphorus removal by chemical method,but also reach better treatment effect under suitable stirring and precipitation conditions by controlling alkalinity and pH.Phosphorus content of chemical sludge after treatment could reach 9%-12%,with higher recyclable value.[Conclusion] Lime method treating phosphorusrich sewage was more economic than low-concentration phosphorus sewage,and had very great potential for recycling phosphorus.
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