利用氧化硫硫杆菌从城市污水处理污泥中生物浸出回收磷。
Recovery of phosphorus from municipal wastewater treatment sludge through bioleaching using Acidithiobacillus thiooxidans.
机构信息
Department of Environmental Engineering and Water Technology, IHE Delft Institute for Water Education, PO Box 3015, 2601, DA Delft, the Netherlands; Laboratory of Analytical Chemistry and Applied Ecochemistry, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, B-9000, Gent, Belgium.
Department of Environmental Engineering and Water Technology, IHE Delft Institute for Water Education, PO Box 3015, 2601, DA Delft, the Netherlands.
出版信息
J Environ Manage. 2020 Sep 15;270:110818. doi: 10.1016/j.jenvman.2020.110818. Epub 2020 Jun 5.
Conventional wastewater treatment plants remove phosphorus, which is captured in sewage sludge. Increasing attention is paid to suitable process pathways that allow recovery and recycling of phosphorus. One of the processes under investigation is acid leaching and recovery of phosphorus, but this requires considerable chemical additives, which could be avoided by stimulating acidification via microbiological processes. This study investigated phosphorus leaching from sewage sludge by biogenic sulfuric acid, using Acidithiobacillus thiooxidans. Sulfur supplementation and solid to liquid ratio were varied to examine how these factors affected phosphorus leaching yield. Chemical leaching by sulfuric acid from sewage sludge and thermally-treated sludge was conducted to compare with bioleaching from sewage sludge. Sewage sludge samples were collected from wastewater treatment plants in Ghent, Belgium, and Delft, The Netherlands. Both bioleaching and chemical leaching were conducted at laboratory scale using shake flask technique, and highest phosphorus leaching yield and time was determined using one-way ANOVA statistical tests. Biogenic sulfuric acid produced by A. thiooxidans extracted phosphorus from both sludge samples. The highest phosphorus leaching yield observed was 48 ± 0% for 17 days from Ghent samples and 57 ± 4% for 27 days from Delft samples with 5.0% (w/v) sulfur supplementation and 1.0% (w/v) solid to liquid ratio. Chemical leaching took shorter than bioleaching, but the leaching yield was lower, i.e. 41 ± 1% for 4 h from Ghent samples, 44 ± 1% for 1 h from Delft samples, 48 ± 1% for 1 h from thermally-treated Ghent samples and 51 ± 2% for 4 h from thermally-treated Delft samples. During phosphorus bioleaching, pH increase was observed during the early stage which hampered the activity of A. thiooxidans and therefore increased phosphorus leaching time. This study suggests that creating conditions for A. thiooxidans to overcome acid neutralizing capacity of sewage sludge is needed to extract phosphorus effectively.
传统的污水处理厂去除磷，磷被捕获在污水污泥中。越来越多的人关注合适的工艺途径，使磷得到回收和再利用。正在研究的工艺之一是酸浸和磷回收，但这需要大量的化学添加剂，如果通过微生物过程刺激酸化，就可以避免这些添加剂。本研究使用氧化硫硫杆菌从污水污泥中浸提磷。研究了硫的补充和固液比如何影响磷浸出率。还进行了从污水污泥和热处理污泥中用硫酸进行的化学浸出，以与从污水污泥中的生物浸出进行比较。污水污泥样品取自比利时根特和荷兰代尔夫特的废水处理厂。生物浸出和化学浸出均在实验室规模下使用摇瓶技术进行，使用单向方差分析统计检验确定最高磷浸出率和时间。氧化硫硫杆菌产生的生物硫酸从两种污泥样品中提取磷。观察到的最高磷浸出率为根特样品 17 天 48±0%，代尔夫特样品 27 天 57±4%，硫补充量为 5.0%（w/v），固液比为 1.0%（w/v）。化学浸出比生物浸出时间短，但浸出率较低，即根特样品 4 小时 41±1%，代尔夫特样品 1 小时 44±1%，根特样品热处理 1 小时 48±1%，代尔夫特样品热处理 4 小时 51±2%。在磷的生物浸出过程中，在早期观察到 pH 值升高，这阻碍了氧化硫硫杆菌的活性，因此增加了磷浸出时间。本研究表明，需要创造有利于氧化硫硫杆菌克服污水污泥的中和能力的条件，以有效地提取磷。
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