连续式超声波发生器对污泥破解效果  

Disintegration of sewage sludge by continuous ultrasonic treatment

作　　者：蒋建国[1] 杨世辉[1] 杜雪娟[1] 杨勇[1] 殷闽[1] 

机构地区：[1]清华大学环境科学与工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2010年第9期1387-1391,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家水体污染控制与治理科技重大专项(2008ZX07313-001)

摘　　要：为了考察动态情况下超声波破解污泥的效果,采用连续式超声波发生器研究不同频率、声能密度、停留时间和发生方式下污泥溶解性化学需氧量(soluble chemical oxygendemand,SCOD)和架桥离子的质量浓度变化。结果表明:25 kHz的超声波较利于污泥破解;增加声能密度和延长停留时间能促进污泥破解,且时间影响较大。在25 kHz、125 W/L、138.8 s时,ρ[SCOD]增幅为68.4%。由于Ca2+、Mg2+两种离子在污泥中作用不同,其质量浓度随污泥破解变化规律不同。平行布置的组合作用方式对污泥的破解较差。因此,在动态情况下超声波能有效破解污泥,但需要结合实际选择合适参数和反应器结构。A continuous ultrasonator was used to break up sewage sludge. The tests investigate the impacts of frequency, energy density, duration and operating pattern on the soluble chemical oxygen demand （SCOD） and metal ions concentrations. The results showed that 25 kHz sounds were very effective and higher energy densities and longer durations benefited the disintegration process with the duration being more important. The SCOD concentration in the sludge increased 68.4% for ultrasonator operating parameters of 25 kHz, 125 W/L and 138.8 s. Since Ca^2＋ and Mg^2＋ play different roles in sewage sludge, their concentrations varied differently as the sludge disintegration. Ultrasonic generators in parallel had poor performance. Thus, ultrasonic waves effectively disrupt sewage sludge, but optimized operating parameters and a suitable reactor structure are needed for good results.

关 键 词：污泥 连续式超声波发生器 破解 污泥溶解性化学需氧量(SCOD) 架桥离子 

分 类 号：X705[环境科学与工程—环境工程]