Release of phosphorus from sewage sludge during ozonation and removal by magnesium ammonium phosphate
Release of phosphorus from sewage sludge during ozonation and removal by magnesium ammonium phosphate
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DOI：
10.1007/s11356-017-0037-8
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发表时间：
2017-09
影响因子：
5.8
通讯作者：
Jian Zhang;Yu Tian;Jun Zhang
中科院分区：
文献类型：
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作者：
Jian Zhang;Yu Tian;Jun Zhang
研究了臭氧氧化和磷酸铵镁（MAP）法去除污泥中磷的释放规律。结果表明：臭氧处理后的污泥上清液中总磷（TP(A)）和正磷酸盐（PO43−p）浓度随臭氧剂量的增加而明显升高，当臭氧剂量低于61.2 mg O3/gSS时基本保持不变；当臭氧剂量为61.2 mg O3/gSS时，臭氧污泥上清液中TP(A)和PO43−p含量分别为70.9和63.3 mg/L。污泥固体总磷（TP(S)）主要分布在无机磷（IP）中（占TP(S)的81.5%以上），臭氧氧化过程中，非磷灰石无机磷（NAIP）是污泥中IP的主要成分（占IP的78.7%以上）。IP对TP(A)的释放贡献（RC）占73.9%以上。在初始Mg2+/PO43−p摩尔比为1.8、pH为9.5、反应时间为5 min的条件下，臭氧化污泥上清液中磷的去除率分别为43.1%和52.2%。
The release rule of phosphorus from sewage sludge during ozonation and removal by the magnesium ammonium phosphate (MAP) method were investigated. The results showed that the concentrations of total phosphorus in aqueous phase (TP(A)) and orthophosphate (PO43−-P) in ozonized sludge supernatant rose obviously with increasing ozone dose when ozone dose was below 61.2 mg O3/gSS then almost kept constant. The TP(A)and PO43−-P contents in the ozonized sludge supernatant were 70.9 and 63.3 mg/L when ozone dose was 61.2 mg O3/gSS, respectively. Total phosphorus in the sludge solid (TP(S)) was mostly distributed in inorganic phosphorus (IP) (more than 81.5% of TP(S)), and non-apatite inorganic phosphorus (NAIP) was the major component of IP in the sludge (more than 78.7% of IP) during ozonation. The release contribution (RC) of IP to TP(A)accounted for over 73.9%. The optimized conditions for the removal of phosphorus from ozonized sludge supernatant were set at an initial Mg2+/PO43−-P molar ratio of 1.8, pH 9.5, and reaction time of 5 min, under which the removal efficiencies of TP(A)and PO43−-P were 43.1 and 52.2%, respectively.