含氯氧化剂对污泥水解性能的影响研究

Effects of Chlorine-containing Oxidant on Performance of Sludge Hydrolysis

含氯氧化剂可以破坏污泥絮体,加快固体物质的溶解,促进污泥中有机质和氨氮等物质的溶出,该文主要研究了二氧化氯(ClO_2)、次氯酸钠(NaClO)、次氯酸钙(Ca(ClO)_2)3种含氯氧化剂对污泥水解特性的影响,以污泥中蛋白质(SPN)、碳水化合物(SPS)、化学需氧量(SCOD)、氨氮(NH_4^+-N)和磷酸盐(PO_4^(3-)-P)的溶出情况为评价指标。结果表明:ClO_2可以促进污泥中SCOD的溶出,当ClO_2投加量为20.00 mg/g TS时,污泥上清液中的SCOD是初始值的24.02倍,NaClO促进污泥水解溶出SPN、SPS方面要强于Ca(ClO)_2和ClO_2,分别是初始值的10.51、12.85倍。而向污泥中加入Ca(ClO)_2后PO_4^(3-)-P含量有所下降,当其投加量为52.98 mg/g TS时,PO_4^(3-)-P的浓度仅为0.014 mg/g TS。

Chlorine-containing oxidants can break up sludge flocs, accelerate the dissolution of solid substances, and promote the dissolution of organic matter and ammonia nitrogen contained in sludge. Accordingly, an experiment was conducted to investigate the effects of three kinds of chlorine-containing oxidants including chlorine dioxide （C102）, calcium hypochlorite （Ca（C10）2） and sodium hypochlorite （NaC10） on the characteristics of sludge hydrolysis, and several indicators were used to evaluate the condition of sludge hydrolysis including protein （SPN）, carbohydrate （SPS）, chemical oxygen demand （COD）, ammonia nitrogen （NH4＋- N） and phosphate （po43--P）, which were dissolved out from sludge. The experimental study showed that C102 could facilitate the dissolution of SCOD from sludge, and when 20.00 mg/g TS of C102 was added to the sludge, SCOD concentration of the sludge supernatant was increased to 24.02 times more than that of the original sludge. Moreover, addition of NaC10 was better in terms of the dissolution of SPN and SPS from sludge than Ca（C10）2 and C102, i.e., the contents of SPN and SPS dissolved were respectively 10.51 and 12.85 times higher than the original sludge. However, it was found that Ca（C10）2 would inhibit phosphate released from sludge so that PO43--P concentration in the supernatant dropped-just 0.014 mg/g TS when the dosage of Ca（CIO）2 added was 52.98 mg/g TS.