酸碱联合调节剩余污泥对有机质的释放和脱水性能的影响

Effect of co-adjusting excess sludge with acid and alkaline on release of organic matter and dewatering performance

为了研究酸碱联合调节剩余污泥水解酸化过程中溶解性蛋白质(SPN)和溶解性碳水化合物(SPS)的释放规律以及对脱水性能的影响,采用3个反应器,其中,1#为先酸(pH 3.0)后碱(pH 10.0)、3#为先碱(pH 10.0)后酸(pH 3.0)的两段控制方式(每段8 d),同时以2#pH不调作为对比实验。结果表明,3个反应器中SPN和SPS的释放情况是调节为碱性>酸性>空白,在相同的控制阶段,SPN的释放量明显高于SPS的释放量;SPN和SPS的最大释放量出现在1#的碱性阶段(后8 d),SPN在碱性阶段的第2天达到最大释放量(883.618 mg/L),SPS在碱性阶段的第8天达到最大释放量(165.922 mg/L)。1#在实验的整个过程中比阻值较低,说明先酸后碱调节方式更利于污泥脱水;在调节为碱性第4天时污泥比阻(SRF)达到最小值(0.342×1013m/kg),处于中难度脱水范围内。与2#相比,3#中的SRF虽稍有改善,但始终处于难脱水范围内。

During the hydrolysis and acidification of co-adjusting excess sludge with acid and alkaline, it was studied that the release law of soluble protein （SPN） and soluble carbohydrates （SPS） and effect on dewatering performance by taking the followed two-step controlling means, which were 1# from acidity（pH 3.0） to alkalinity（pH 10.0）, 3# from alkalinity（pH 10.0） to acidity（pH 3.0）, each step 8 days, and 2# pH unadjusted as control test of three reactors, respectively.The results show that the release situation of SPN and SPS is alkalinity〉acidity〉blank and the release quatity of SPN is greater than SPS apparently at the same control stage of three reactors; both of the maximum release quatity of SPN and SPS appear on alkalinity control stage（8 days after） of 1# with the max release quatity of SPN appearing on the second day（883.618 mg/L） and SPS appearing on the 8th day（165.922 mg/L） respectively. SRF is lower in the whole process of experiment of 1#, indicating that from acidity to alkalinity is more conducive to sludge dewatering. Specific resistance to filtration（SRF） reaches to the minimum value（0.342×1013 m/kg） at the alkalinity control stage on the 4th day and is in the middle difficult dewatering. In contrast with 2#, SRF is a little better improved of 3#, but always within the most difficult dewatering.