回收污泥中的磷能缓解磷资源危机。鸟粪石法回收污泥中磷需要先对其进行活化。比较微波、葡萄糖和水解尿液对厌氧污泥中磷释放的影响，并验证鸟粪石法回收污泥上清液中磷的可行性。结果表明：微波、葡萄糖和尿液均能促进污泥中磷的释放，且污泥磷释放率为64.57%（微波）、66.93%（葡萄糖）、65.63%（0.2 L尿液）、68.78%（0.4 L尿液），显著大于对照处理的40.77%。尿液促进污泥磷释放的主要原因是水解尿液中高浓度的游离态氨氮分解聚磷菌细胞，促使无机磷释放。将氯化镁加入到尿液活化污泥获得的上清液中，可得到高质量的鸟粪石沉淀，实现污泥磷回收。
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.
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