EDTA对剩余污泥磷释放及MAP法磷回收影响

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Abstract

The effects of EDTA on phosphorus release from excess sludge during anaerobic digestion, and on the phosphorus recovery by magnesium ammonium phosphate (MAP) precipitation were investigated. The pretreatment condition was optimized by the variety of total phosphorus (TP), protein, polysaccharide, DNA and SCOD in sludge supernatant under different EDTA concentrations during anaerobic digestion process. Furthermore, the prediction model of MAP phosphorus recovery rate and MAP purity was set up by utilizing the response surface methodology (RSM). The results indicated that the optimum additive dosage of EDTA was 5mmol/L, and optimal anaerobic reaction time was 5d; DD had significant association with TP, DNA, protein and polysaccharide, in which the maximum correlation coefficients 0.866was between DD and TP; The optimal process parameters of MAP phosphorus recovery was: pH=9.5, n(Mg):n(P)=1.6, stirring time =22min, under this circumstance MAP phosphorus recovery rate was 95.68% and purity was 79.19%.

Key words： EDTA phosphorus release phosphorus recovery magnesium ammonium phosphate (MAP) response surface methodology (RSM)

Received: 30 August 2018

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X799

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	Articles by authors
	HU De-xiu
	ZHANG Yan
	Zhang Cong

Cite this article:

HU De-xiu,ZHANG Yan,Zhang Cong. Effects of EDTA on phosphorus release in excess sludge and phosphorus recovery by MAP[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1611-1618.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I4/1611

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