CAJ | 학술논문

为解决污泥回流强化混凝技术存在的有毒有害物质积累的问题,取净水沉淀污泥经超声预处理后进行回流试验,考察超声作用后净水沉淀污泥絮体特性的变化及其对回流效能的影响.结果表明：超声作用后污泥溶液的温度升高,絮体粒径减小,长时间作用后粒径可降至几个μm,且粒径与声能密度呈现相关性；1,5W/mL的超声处理后,絮体Zeta电位降低,比表面积增大,10,15W/mL的超声处理后絮体Zeta电位升高,比表面积有所下降；低声能密度(1W/mL)超声处理后污泥回流可强化混凝效果,30min 超声作用后污泥回流的浊度、UV254和 CODMn去除率分别提高了2.7%、23.12%和10.02%,长时间高声能密度(15W/mL)超声波处理污泥回流后混凝效果反而恶化.超声技术对污泥回流后污染物的去除率有一定的提高,但超声时间和声能密度必须很好控制.
위해결오니회류강화혼응기술존재적유독유해물질적루적문제,취정수침정오니경초성예처리후진행회류시험,고찰초성작용후정수침정오니서체특성적변화급기대회류효능적영향.결과표명：초성작용후오니용액적온도승고,서체립경감소,장시간작용후립경가강지궤개μm,차립경여성능밀도정현상관성；1,5W/mL적초성처리후,서체Zeta전위강저,비표면적증대,10,15W/mL적초성처리후서체Zeta전위승고,비표면적유소하강；저성능밀도(1W/mL)초성처리후오니회류가강화혼응효과,30min 초성작용후오니회류적탁도、UV254화 CODMn거제솔분별제고료2.7%、23.12%화10.02%,장시간고성능밀도(15W/mL)초성파처리오니회류후혼응효과반이악화.초성기술대오니회류후오염물적거제솔유일정적제고,단초성시간화성능밀도필수흔호공제.
In the process of enhanced coagulation by recycling sludge, drinking water precipitated sludge was pre-treated by ultrasound and the recycle trails were subsequently carried out, in order to solve the enrichment problem of poisonous and pernicious substance. The effect of ultrasound on the variability offlocs characteristics of drinking water precipitated sludge was mainly focused on, and so was its impact on coagulation efficiency of sludge recycling process. After the exposure to ultrasound, the temperature of sonicated sludge solution was raised and floc size was decreased, even could drop to a few microns after a long-term treatment. And The floc size exhibited a linear correlation with the energy density. Zeta potential of flocs of pre-sonicated sludge was decreased while specific surface was improved with energy density of 1W/mL and 5W/mL, contrastively Zeta potential was raised and specific surface was decreased with energy density of 10W/mL and 15W/mL. The coagulation efficiency was enhanced by recycling pre-sonicated sludge with a low energy density (1W/mL) within 30min ultrasonication. The improvement of turbidity, UV254 and CODMn removal was 2.7%, 23.12% and 10.02% respectively. Comparatively, a long time of ultrasonication under high energy density (15W/mL) could reduce the coagulation efficiency. Therefore, the ultrasound technique could enhance the pollutant removal, but the ultrasound time and energy density must be well controlled.