臭氧耦合机械破碎强化污泥自溶减量技术的研究

Enhancing Sludge Autolysis Reduction Technology by Combination of Ozone and Mechanical Crushing

基于剩余污泥原位处理的理念,采用臭氧耦合机械破碎协同氧化技术强化污泥裂解自溶,快速释放胞内有机物,建立一套实验用机械破碎、臭氧处理、生化处理一体化实验装置。通过改变搅拌桨转速、臭氧质量浓度、臭氧投加量、作用时间以及分析原始剩余污泥和不同处理方法下混合液中有机物、总氮质量浓度和总磷质量浓度的变化,考察各因素对剩余污泥破碎分解的影响以及优化组合后对剩余污泥减量化的效果。结果表明:当六直叶圆盘涡轮式搅拌桨转速800 r/min、臭氧进气量1.6 L/min、臭氧质量浓度39 mg/L、污泥处理时间30 min,即臭氧投加量为110mg/g(相对于混合液悬浮物)时,污泥细胞裂解效果最佳,此时活性污泥自溶分解率为42.36%,相比单独投加臭氧以及机械破碎,活性污泥自溶分解率分别提高了13.76%、36.47%,其中混合液体中的溶解化学需氧量(SCOD)、总氮质量浓度和总磷质量浓度分别由初始状态的45 mg/L、11 mg/L和2.14 mg/L上升到2596 mg/L、206.9 mg/L和47 mg/L。实验结果可以证明臭氧耦合机械破碎协同氧化强化污泥裂解自溶减量的可行性,本研究为污泥减量化提供了新的集成技术。

Based on the concept of in-situ treatment of excess sludge,a set of experimental equipment for mechanical mixing,ozone and biochemical treatment was established,which used the ozone and mechanical crushing to strengthen sludge pyrolysis and autolysis to rapidly release intracellular organic substances.By changing the speed of the agitator,ozone mass concentration,ozone dosage and action time,and analyzing the changes of organic matter,total nitrogen mass concentration and total phosphorus mass concentration in the original excess sludge,the influence of various factors on the fragmentation,decomposition of excess sludge and the effect of combination methods on the reduction of excess sludge were investigated.The results showed that the best effect of sludge cytolysis was achieved with the six-blade disc turbines speed of 800 r/min,the ozone inlet volume of 1.6 L/min,the ozone concentration of 39 mg/L and the sludge treatment time of 30minutes,that is,when the ozone dosage was 110mg/g(relative to mixed liquor suspended solids).At this time,the activated sludge autolysis efficiency was 42.36%.Compared with ozone alone and mechanical crushing,the activated sludge autolysis effi-ciency was increased by 13.76%and 36.47%,respectively.Moreover,when ozone was combined with mechanical crushing,the soluble chemical oxygen demand(SCOD),total nitrogen mass concentration and total phosphorus mass concentration in the mixed liquid was increased from 45 mg/L,11mg/L and 2.14mg/L to 2596mg/L,206.9 mg/L and 47mg/L,respectively.The experiment has proved the feasibility of combination of ozone and mechanical crushing to enhance sludge autolysis reduction,and provided a new integrated technology for sludge reduction.