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首页> 外文期刊>Separation and Purification Technology >Investigation of phosphorus desorption from P-saturated alum sludge used as a substrate in constructed wetland
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Investigation of phosphorus desorption from P-saturated alum sludge used as a substrate in constructed wetland

机译：人工湿地中P-饱和明矾污泥中磷的解吸研究

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摘要

Phosphorus(P)desorption from P-saturated alum sludge,which was used as main substrate in a novel constructed wetland for wastewater treatment,was studied.Groups of batch experiments were designed and conducted to explore the efficiencies of P extraction using different acids(HC1,HNO3 and H2SO4)and bases(NaOH and KOH).The results showed that either acid or base is efficient for P extraction and the efficiency relied mainly on the concentrations of H~+/OH~-,not the type of acid or base.Considering the efficiency,price and safety of the acids and bases tested,H2SO4 was chosen as most suitable reagent for P extraction.A Box-Behnken experimental design based on the response surface methodology(RSM)was applied to evaluate the optimum of H2SO4 extraction.The optimal condition for the mass of sludge,H2SO4 concentration and volume was 0.8 g,0.063 M and 142 ml,respectively.At such optimal condition,the maximum P extraction efficiency of 98.2% was achieved.Additionally,most of the main components of the saturated sludge,such as metals(Al,Ca,Mg and Fe),TOC(total organic carbon)and nitrogen can also be extracted.Overall,the results supported that H2SO4 seems to be an efficient and cost-effective reagent among all the reagents tested for P-saturated alum sludge treatment.
机译：研究了在新型人工湿地中用作污水处理的主要基质的P饱和明矾污泥中的P（P）吸附。设计和进行了分批实验，以探索使用不同酸（HC1）提取P的效率，HNO3和H2SO4）以及碱（NaOH和KOH）。结果表明，酸或碱对P的萃取均有效，其效率主要取决于H〜+ / OH〜-的浓度，而不是酸或碱的类型。考虑到所酸和碱的效率，价格和安全性，选择了H2SO4作为最合适的P提取试剂。基于响应面法（RSM）的Box-Behnken实验设计用于评估H2SO4提取的最佳条件污泥质量，H2SO4浓度和体积的最佳条件分别为0.8 g，0.063 M和142 ml。在这种最佳条件下，最大P提取效率达到98.2％。此外，大多数主要成分还可以提取饱和污泥中的金属（Al，Ca，Mg和Fe），TOC（总有机碳）和氮。总的说来，结果证明H2SO4似乎是一种高效且经济的试剂测试了用于P饱和明矾污泥处理的试剂。

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