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Influence of pH and Biological Metabolism on Dissolved Phosphorus during Biological Treatment of Piggery Wastewater

机译：pH值和生物代谢对养猪废水生物处理过程中溶解磷的影响

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In areas with intensive animal farming, phosphorus from livestock waste contributes to the eutrophication of surface water. To increase the phosphorus recycling potential, mineral phosphorus products have to be obtained not only from the liquid but also from the solid phase of piggery wastewater needing new physico-chemical processes to be investigated. Discarding phosphorus from organic matter by a previous solubilisation of phosphorus improves the potential recycling yield. In this aim, evolution of dissolved phosphorus was studied during a simplified sequencing batch reactor process. Two slurries were tested in a sequencing batch reactor pilot plant to see if the biological phosphorus metabolism could be used to obtain a phosphorus-enriched effluent suitable for chemically recycling phosphorus. Dissolved phosphorus, calcium, magnesium and intracellular carbon storage as polyhydroxybutyrate were measured. When available carbon was sufficient both biological and chemical mechanisms were involved in phosphorus evolution. Dissolved P concentration was increased by up to seven fold by the biological treatment. However, the precipitation/dissolution of phosphate driven by the pH was dominant to explain the changes during one treatment cycle. Higher dissolved phosphorus concentration was obtained at the end of the acidification step due to nitrification. This result was discussed in the perspective to develop alternative strategies to obtain an enriched effluent suitable for a side-stream phosphorus recycling process.
机译：在集约化畜牧业的地区，牲畜粪便中的磷导致地表水富营养化。为了增加磷的再循环潜力，不仅必须从液体中而且从需要研究新的物理化学过程的猪场废水的固相中获得矿物质磷产品。通过预先溶解磷将磷从有机物中去除，可以提高潜在的回收率。为此，在简化的顺序批反应器过程中研究了溶解磷的释放。在顺序批处理反应器中试工厂中测试了两种浆料，以查看生物磷代谢是否可用于获得适合化学回收磷的富磷废水。测定了溶解的磷，钙，镁和细胞内碳的储存量（聚羟基丁酸酯）。当可用的碳足够时，磷的进化涉及生物和化学机制。通过生物处理，溶解的P浓度最多增加了7倍。然而，由pH值驱动的磷酸盐的沉淀/溶解占主导地位，可以解释一个处理周期内的变化。由于硝化作用，在酸化步骤结束时获得了更高的溶解磷浓度。从结果的角度讨论了此结果，以开发替代策略以获得适用于侧流磷回收工艺的浓缩废水。

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