投加硫化钠强化含磷酸铁污泥厌氧释磷的研究

发布时间：2018-03-26 09:27

本文选题：磷酸铁　切入点：混合污泥　出处：《中国环境科学》2017年11期

【摘要】：以污泥中磷酸铁(FePO_4)沉淀为主要研究对象,研究了Na_2S投加量以及温度对FePO_4释磷的影响,分析了在厌氧条件下Na_2S投加量对含FePO_4污泥释磷以及厌氧发酵的影响.结果表明,在溶液中Na_2S投加量越大,磷释放率越高,当S/Fe摩尔比为5:1及以上时,FePO_4释磷率可以达到100%,温度主要影响反应的速率;在含FePO_4混合污泥厌氧发酵过程中,投加Na_2S可促进释磷,且FePO_4释磷率随着Na_2S投加量的增加而升高,当S/Fe摩尔比为分别为1:1、3:1、5:1时,FePO_4释磷率分别为60%、93%和100%,相较于未投加Na_2S的污泥释磷率提高了26%、59%和73%;此外,投加Na_2S还可以促进污泥厌氧发酵产酸,投加量为S/Fe=3:1时,厌氧发酵7d后产酸量最大,是不投加Na_2S时污泥产酸量的4.3倍,但投加Na_2S对产甲烷不利.
[Abstract]:Taking FePO4 precipitation in sludge as the main research object, the effects of Na_2S dosage and temperature on FePO_4 phosphorus release were studied, and the effects of Na_2S dosage on phosphorus release and anaerobic fermentation of FePO_4 containing sludge under anaerobic condition were analyzed. When the molar ratio of S/Fe is 5:1 or more, the phosphorus release rate of FePO4 can reach 100%, and the reaction rate is mainly affected by temperature, and the addition of Na_2S can promote phosphorus release during anaerobic fermentation of mixed sludge containing FePO_4. The phosphorus release rate of FePO_4 increased with the increase of Na_2S dosage. When the molar ratio of S/Fe was 1: 1: 3: 1: 5: 1, the phosphorus release rate of FePO4 was 60 93% and 100% respectively, which was 2659% and 73% higher than that of sludge without Na_2S. The addition of Na_2S could also promote the anaerobic fermentation of sludge to produce acid. When the dosage of S/Fe=3:1 was S/Fe=3:1, the acid production of anaerobic fermentation was the largest after 7 days, which was 4.3 times as much as that of sludge without Na_2S, but adding Na_2S was unfavorable to methane production.
【作者单位】：同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室;
【基金】：水体污染控制与治理科技重大专项(2015ZX07306001)
【分类号】：X703

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