鸟粪石沉淀-协同氧化预处理阻燃剂废水

Flame retardants wastewater pretreatment by struvite precipitation-synergy oxidation

采用鸟粪石沉淀法、Fe/C微电解-Fenton氧化组合工艺对阻燃剂废水进行预处理,研究各阶段的最优反应条件。结果表明:鸟粪石沉淀最优工艺条件为pH 9.5、HRT=20 min、n(Mg)∶n(P)=1.1∶1,Fe/C微电解-Fenton氧化的最优工艺条件为初始pH 3.5、HRT=80 min、双氧水(30%浓度)的投加量为10%。最优条件下连续运行的出水COD、TP和NH_4^+-N的去除率可达70%、97.8%和78.6%左右。

Flame retardant wastewater was pretreated by struvite precipitation and Fe/C micro-electrolysis-Fen- ton combination oxidation process. The optimal reaction conditions at each stage were studied. The optimum process conditions for the struvite precipitation stage were：influent pH 9.5, HRT 90 rain, and n（Mg） ：n（P） = 1. 1 ： 1. The optimum process conditions for the Fe/C micro-electrolysis-Fenton oxidation stage were：influent pH 3, HRT 90 min, and H202 dosage of 10%. With continuous operation under optimal conditions, the total remov- al rates of COD, TP, and NH4-N were about 70%