Biological wastewater treatment plants produce great amounts of sludge daily. It is a very big loading (cost) for treating the waste sludge. Polyhydroxyalkanoates are a family of polyhydroxyesters. The technologies of extracting PHAs from wasted sewage sludges of municipal wastewater, fermentation industry and husbandry were developed in the study. In the NaOCl/SDS extraction technology, the concentration of NaOCl and liquid-solid ratio are two essential factors directly influencing extraction efficiency. The experimental results verified under the optimal conditions for extracting PHAs, the content of recovered PHAs was 44.2±0.89 mgPHA/gVSS and the purity of recovered PHAs was >99.5 wt% for the waste sludge from municipal wastewater treatment plants. For fermentation industry sludge, under the adequate extraction conditions for PHAs recovery, the content and purity of recovered PHAs were 18.8±0.66 mgPHA/gVSS and 50.6±6.83 wt%, respectively. For husbandry sludge, the content and purity of recovered PHAs were 33.7±0.16 mgPHA/gVSS and 76.7±5.2 wt%, respectively.

中文翻译：

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从不同废物污泥源中提取相时的最佳条件比较

生物污水处理厂每天会产生大量污泥。处理废污泥是一个非常大的负荷（成本）​​。聚羟基链烷酸酯是一类聚羟基酯。研究开发了从城市污水、发酵工业和畜牧业的废弃污泥中提取PHA的技术。在 NaOCl/SDS 提取技术中，NaOCl 的浓度和液固比是直接影响提取效率的两个重要因素。实验结果验证了在最佳提取PHA条件下，城市污水处理厂废污泥回收PHA含量为44.2±0.89 mgPHA/gVSS，回收PHA纯度>99.5 wt%。对于发酵工业污泥，在适当的提取条件下回收 PHAs，回收的PHA的含量和纯度分别为18.8±0.66 mgPHA/gVSS和50.6±6.83 wt%。对于畜牧污泥，回收的PHA的含量和纯度分别为33.7±0.16 mgPHA/gVSS和76.7±5.2 wt%。