A lysimeter experiment was conducted to investigate the environmental effects of applying farm dairy effluent (FDE) treated with a chemical coagulant (polyferric sulphate) to land. The coagulant was administered as part of an effluent treatment system known as ClearTech. Two products are produced from the treatment process; treated effluent (TE) and clarified water (CW). Applications were applied in May. When compared to FDE, TE and CW reduced E. coli, Total-P and dissolved reactive P (DRP) leaching losses. Escherichia coli leaching losses were reduced by 99.97% and 99.99% for TE and CW, respectively. This was because of the acidity of the added coagulant and the encapsulation of the bacteria in the flocculated sediment. Compared to FDE, Total-P leaching losses were reduced by 90.5% and 85.7% for TE and CW, respectively. DRP leaching losses were also reduced under TE and CW by 99.5% and >99.99%, respectively. Reductions in phosphorus leaching were attributed to the reduced P solubility, resulting from the iron added in the coagulant binding to the phosphorus. There was no significant difference between treatments in the amount of iron leached, greenhouse gas emissions or Mineral-N leached (except where additional ammonium-N was added to the clarified water). ARTICLE HISTORY Received 12 December 2019 Accepted 21 August 2020

中文翻译：

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聚合硫酸铁处理的农场奶牛废水和澄清水对浸出损失、温室气体排放和牧场生长的影响

进行了蒸渗仪实验以研究将用化学混凝剂（聚合硫酸铁）处理过的农场乳制品废水 (FDE) 应用于土地的环境影响。混凝剂作为称为 ClearTech 的污水处理系统的一部分进行管理。处理过程产生两种产品；处理过的污水 (TE) 和澄清水 (CW)。申请已于 5 月提交。与 FDE 相比，TE 和 CW 减少了大肠杆菌、总磷和溶解活性磷 (DRP) 的浸出损失。TE 和 CW 的大肠杆菌浸出损失分别减少了 99.97% 和 99.99%。这是因为添加的混凝剂的酸性和絮凝沉淀物中的细菌包裹。与 FDE 相比，TE 和 CW 的 Total-P 浸出损失分别降低了 90.5% 和 85.7%。DRP 浸出损失在 TE 和 CW 下也分别减少了 99.5% 和 >99.99%。磷浸出的减少归因于磷溶解度的降低，这是由于混凝剂中添加的铁与磷结合所致。处理之间在铁浸出量、温室气体排放量或矿物-N 浸出量方面没有显着差异（除非向澄清水中添加额外的铵-N）。文章历史 2019 年 12 月 12 日收到 2020 年 8 月 21 日接受 温室气体排放或矿物氮浸出（除非在澄清水中添加了额外的铵氮）。文章历史 2019 年 12 月 12 日收到 2020 年 8 月 21 日接受 温室气体排放或矿物氮浸出（除非在澄清水中添加了额外的铵氮）。文章历史 2019 年 12 月 12 日收到 2020 年 8 月 21 日接受