加碱处理PAC污泥的释磷机理及磷回收研究

发布时间：2018-05-08 21:38

本文选题：加碱处理 + PAC污泥　；参考：《中国环境科学》2017年09期

【摘要】：以加碱处理PAC污泥,考察了不同p H条件下污泥破解情况,研究了污泥中磷和铝的释放以及磷形态分布与变化以分析污泥释磷机理,最后对释放的磷进行回收.结果表明,相比于p H=11、12,p H=13更有效地促使污泥细胞破解和DNA释放,240min后细胞破解率达96.9%.同时,SOP(溶解性正磷酸盐,以PO_4~(3-)-P计)大量释放,其中大部分来源于磷酸铝和氢氧化铝的溶解.调节污泥初始p H=13,240min后污泥中91.2%的NAIP(非磷灰石无机磷)和69.2%的OP(有机磷)溶解释放.对加碱处理后的污泥脱水,取脱水滤液进行磷回收,p H=9.5,Ca/P=3时,30min后磷回收效果可达82.4%.研究认为,通过加碱促使PAC污泥大量释磷并回收,效果好、运行简单,具有实际应用潜力.
[Abstract]:In order to analyze the mechanism of phosphorus release from PAC sludge under different pH conditions, the release of phosphorus and aluminum in sludge, the distribution and variation of phosphorus form were studied. Finally, phosphorus released from sludge was recovered. The results showed that compared with that of pH111O12PHN13, the cell cleavage rate of sludge cells was 96.9% after 240min of DNA release and sludge cell cleavage was more effective. At the same time, SOP (dissolved orthophosphate, expressed as PO_4~(3-)-P) was released in large quantities, most of which came from the dissolution of aluminum phosphate and aluminum hydroxide. After adjusting sludge initial p H=13240min, 91.2% NAIP (non-apatite inorganic phosphorus) and 69.2% OP3 (organic phosphorus) were dissolved and released. After dewatering of sludge treated with alkali, phosphorus recovery from dehydrated filtrate was achieved to 82.4% after 30 minutes of phosphorus recovery (P = 3). It is concluded that the PAC sludge can be released and recovered by adding alkali, which has good effect, simple operation and practical application potential.
【作者单位】：深圳市环境科学研究院国家环境保护饮用水水源地管理技术重点实验室深圳市饮用水水源地安全保障重点实验室深圳市水环境中新型污染物检测与控制重点实验室;
【基金】：深圳市科技计划项目(CXZZ20150330151321966;YCYJ20150730155600636)
【分类号】：X703

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