Effects of microwave, glucose, and hydrolyzed urine on phosphorus release and recovery from sewage sludge

doi:10.7523/j.issn.2095-6134.2020.06.004

Abstract

Abstract: Recovery of phosphorus from sewage sludge alleviates the phosphorus crisis. The sludge phosphorus requires to be activated before it is recovered through struvite method. We investigate the effects of microwave, glucose, and hydrolyzed urine on phosphorus release from anaerobic sludge, and also evaluate the feasibility of recovering phosphorus from sludge supernatant through struvite method. Results show that microwave, glucose, and urine promote the phosphorus release from sludge. The phosphorus release rates are 64.57%, 66.93%, 65.63%, and 68.78% for microwave, glucose, 0.2 L urine, and 0.4 L urine, respectively, which are significantly higher than the rate of 40.77% under control treatment. Hydrolyzed urine promotes phosphorus release from sludge mainly because its high concentration of free ammonia nitrogen disintegrates the cells of polyphosphate-accumulating organisms and then accelerates the inside-body inorganic phosphorus release. High-quality struvite precipitation is obtained while magnesium chloride is added into the urine-activated sludge supernatant. The method expressed in this study can be used to well realize the phosphorus recovery from sludge.

Key words: human urine, free ammonium, sludge, microwave, struvite

CLC Number:

X703

WEN Guoqi, ZHANG Xiangru, HUANG Lijuan, HU Zhengyi. Effects of microwave, glucose, and hydrolyzed urine on phosphorus release and recovery from sewage sludge[J]. , 2020, 37(6): 744-749.

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