Industries all over the world generate huge amounts of wastewater, which needs to be treated. The integration of polyhydroxyalkanoates (PHA) production into wastewater treatment is a promising strategy for resource recovery that improves the sustainability of industrial wastewater treatment plants. This study aims to investigate PHA production from several industrial wastewaters using a microbial mixed culture enriched in bacteria of the genus Thauera. The wastewaters were classified based on the volatile fatty acid (VFA) concentration and the presence of ethanol: (W1) wastewater with VFA <12 mM (anaerobically treated dairy, yeast and paper mill wastewaters), (W2) wastewater with VFA >12 mM (acidified sugar, paper mill and brewery wastewaters), and (W3) wastewater with VFA >12 mM and ethanol (acidified starch, distillery and dairy wastewaters). No PHA accumulation was obtained with wastewaters in the category W1 because the VFA concentration was low and was used for biomass growth and maintenance. The maximum PHA accumulation of 46.5% cdw was achieved from acidified paper mill wastewater. For other wastewaters in the categories W2 and W3, PHA accumulation was in the range of 37–45.6% cdw. In the W2 category, PHA accumulation inhibition due to VFA concentration was observed in the case of acidified sugar wastewater, while for wastewaters in the W3 category inhibition was provoked by the wastewater matrix itself. Nevertheless, PHA accumulation inhibition was overcome by wastewater dilution. The presence of ethanol in wastewaters within the category W3 (>27 mM) decreased PHA accumulation circa 20%. The thermal characteristics of the copolymer PHB:PHV obtained in the present study are similar to those of commercial PHAs. Additionally, the produced copolymer was used successfully as a carbon source for nitrate removal (0.72 mg NO${}_3^{-}$/mg PHA). This study shows that resource recovery in the form of biopolymers is an option for several industrial wastewaters and that the copolymers obtained are biodegradable.

世界各地的工业产生大量废水，需要对其进行处理。将聚羟基链烷酸酯（PHA）生产整合到废水处理中是一种有前途的资源回收策略，可提高工业废水处理厂的可持续性。这项研究旨在研究使用富含Thauera属细菌的微生物混合培养物，从几种工业废水中生产PHA的方法。根据挥发性脂肪酸（VFA）的浓度和乙醇的存在对废水进行分类：（W1）VFA <12 mM的废水（经厌氧处理的乳，酵母和造纸厂废水），（W2）VFA> 12 mM的废水（酸化糖，造纸厂和啤酒厂废水），以及VFA> 12 mM的（W3）废水和乙醇（酸化淀粉，酿酒厂和乳制品废水）。由于VFA浓度低且被用于生物量的生长和维持，因此在W1类废水中未获得PHA积累。从酸化的造纸废水中获得最大的PHA积累46.5％cdw。对于W2和W3类的其他废水，PHA积累量为37–45.6％cdw。在W2类别中，在酸化糖废水中观察到由于VFA浓度引起的PHA积累抑制，而在W3类废水中，抑制作用是由废水基质本身引起的。但是，废水稀释可以克服PHA的积累抑制作用。W3（> 27 mM）类别的废水中存在乙醇，可使PHA积累降低约20％。在本研究中获得的共聚物PHB：PHV的热特性与商业PHA相似。此外，所生产的共聚物已成功用作碳源以去除硝酸盐（0.72 mg NO W3（> 27 mM）类别的废水中存在乙醇，可使PHA积累降低约20％。在本研究中获得的共聚物PHB：PHV的热特性与商业PHA相似。此外，所生产的共聚物已成功用作碳源以去除硝酸盐（0.72 mg NO W3（> 27 mM）类别的废水中存在乙醇，可使PHA积累降低约20％。在本研究中获得的共聚物PHB：PHV的热特性与商业PHA相似。此外，所生产的共聚物已成功用作碳源以去除硝酸盐（0.72 mg NO${}_3^{-}$/ mg PHA）。这项研究表明，以生物聚合物的形式进行资源回收是几种工业废水的一种选择，并且所获得的共聚物是可生物降解的。