pH 调控高铁酸钾氧化促进废活性污泥中乙酸的生成和磷的回收。
pH regulated potassium ferrate oxidation promotes acetic acid yield and phosphorous recovery rate from waste activated sludge.
机构信息
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.
Institute of Bioresource and Agriculture, Hong Kong Baptist University, Hong Kong Special Administrative Region, China.
出版信息
Bioresour Technol. 2022 Oct;362:127816. doi: 10.1016/j.biortech.2022.127816. Epub 2022 Aug 24.
To improve the dose efficiency of KFeO in waste activated sludge (WAS) treatment, pH regulation on KFeO pretreatment and acidogenic fermentation was investigated. Four pretreatments were compared, i.e. pH3 + 50 g/kg-TS, pH10 + 50 g/kg-TS, neutral pH + 50 g/kg-TS and neutral pH + 100 g/kg-TS (without pH adjustment). The higher short chain fatty acids (SCFAs) yield and phosphorous dissolution rate was found under the condition of pH 10.0. In pH10 + 50 g/kg-TS, the maximum concentration of SCFAs was 5591 mg-COD/L, which yield was 22.6 times higher than that of the neutral pH + 50 g/kg-TS (237 mg COD/L). The acidogenic fermentation period could be shortened to 5 days and acetic acid accounted for 70 % of SCFAs. Furthermore, PO-P in the hydrolysate (346.5 mg/L) accounted for 47.59 % of TP, which is easier to be recovered by chemical precipitation. Therefore, a more economical and feasible utilization mode of potassium ferrate was proposed.
为提高高铁酸钾（KFeO）在处理剩余活性污泥（WAS）中的剂量效率，研究了 KFeO 预处理和产酸发酵过程中的 pH 调节。比较了四种预处理方法，即 pH3+50g/kg-TS、pH10+50g/kg-TS、中性 pH+50g/kg-TS 和中性 pH+100g/kg-TS（不进行 pH 调节）。发现 pH10.0 条件下可获得更高的短链脂肪酸（SCFAs）产率和磷溶解率。在 pH10+50g/kg-TS 条件下，SCFAs 的最大浓度为 5591mg-COD/L，产率是中性 pH+50g/kg-TS（237mg COD/L）的 22.6 倍。产酸发酵周期可缩短至 5 天，其中乙酸占 SCFAs 的 70%。此外，水解液中的 PO4-P（346.5mg/L）占总磷（TP）的 47.59%，更易于通过化学沉淀回收。因此，提出了一种更经济可行的高铁酸钾利用模式。
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