Organic matter extracted from activated sludge with ammonium hydroxide and its characterization.
Organic matter extracted from activated sludge with ammonium hydroxide and its characterization.
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DOI：
10.1016/s1001-0742(09)60157-1
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发表时间：
2010
影响因子：
6.9
通讯作者：
Liangliang Wei;Kun Wang;Qingliang Zhao;Junqiu Jiang;Chunmei Xie;W. Qiu
中科院分区：
文献类型：
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作者：
Liangliang Wei;Kun Wang;Qingliang Zhao;Junqiu Jiang;Chunmei Xie;W. Qiu
为了表征某污水处理厂剩余活性污泥的有机性质，采用NH3. H2O优先提取污泥中的有机物，然后用XAD-8/XAD-4树脂将其分离成5个组分。NH_3·H_2O可有效提取污泥中63.8%~ 71.1%的有机物。分级结果表明，疏水性酸和亲水性组分是污泥有机质的主要组分（分别占有机质总量的32.2%和48.0%），而转亲水性酸、疏水性中性和转亲水性中性组分的含量很低（分别占9.2%、5.8%和4.8%）。虽然NH3·H2O萃取剂对芳香族组分的萃取效率较高，但有机组分的芳香度较低，这意味着非芳香族组分也能被有效萃取，尤其是中性和亲水性组分。此外，酸性馏分含有更多的芳香族腐殖酸类成分，而中性馏分有更大的芳香族蛋白质和可溶性微生物副产物类成分的含量。采用NH3·H2O萃取污泥有机物，再用XAD树脂分级分离，可为污泥有机物的进一步表征提供一种新的方法。
In order to characterize the organic properties of waste activated sludge in a wastewater treatment plant, organic matter within sludge was extracted with NH3·H2O preferentially, and subsequently fractionated into five fractions using XAD-8/XAD-4 resins. Up to a 63.8%–71.1% of organic matter within the sludge could be efficiently extracted by NH3·H2O. Fractionation results showed that hydrophobic acid and hydrophilic fraction were two main components among the sludge organic matter (accounting for 32.2% and 48.0% of the bulk organic matter, respectively), whereas transphilic acid, hydrophobic neutral and transphilic neutral were quite low (accounting for 9.2%, 5.8% and 4.8%, respectively). Despite that the extractant of NH3·H2O showed a relatively higher extraction efficiency of the aromatic components, the relatively low aromaticity of the organic fractions implied that those non-aromatic components could also be effectively extracted, especially for neutral and hydrophilic fractions. In addition, acidic fractions contained more aromatic humic-like components, whereas the neutral fractions had a greater content of aromatic proteins and soluble microbial byproduct-like components. Extraction of sludge organics with NH3·H2O and subsequential fractionation using XAD resins could be a novel method for further characterization of sludge organics.