摘要
以高含磷剩余污泥为对象,采用超声波处理、热处理和酸碱调节3种减量化技术,研究了细胞物质溶解过程中COD、氮、磷的释放规律。结果表明,在超声最大时间为1.0h、声能密度为0.167～0.500W/mL的实验条件下,超声波处理中污泥减量和细胞物质的释放效果随超声时间延长而提高,声能密度对释放效果的影响较小;在热处理中,污泥减量和细胞物质的释放效果随热处理温度的升高和热处理时间的延长而提高,但热处理温度的贡献大于热处理时间;在超声波处理和热处理(除热处理温度为50℃外)中,污泥上清液TN中均以有机氮为主,NH3-N次之;在酸碱调节处理中,只有在初始pH为12.0时,处理4.0h后才会有一定的污泥减量和溶解效果,但污泥浓度下降不明显。3种减量化技术中,超声波处理最为经济、有效。
Sotubilization performances of organic materials, nitrogen and phosphorus from waste activated sludge （WAS） samples using sonication, thermal and acid-alkali adjustment in batch treatments were evaluated. By sonication, the organics （measured as COD） and nutrient releases from WAS increased with increasing treatment time （up to 1. 0 h）, and sonication time played a more important role than intensity （0. 167-0. 500 W/mL） in WAS solubilization. By thermal treatment, the releases of biomass materials increased with increasing treatment time （up to 3.0 h） and temperature （50, 70 and 90 ℃）, but the temperature had the more contribution on the releases than treatment time. Organic-N of the supernatant accounted for most of the total nitrogen released from the WAS, followed by NH3-N. The sludge treatment by adjusting pH from 3.0 to 10.0 was unable to cause substantial releases of organic and nutrient species, even treated at a higher pH of 12.0 for 4.0 h, the releases were still not apparent in a significant reduction of TS. Among the three treatment methods, sonication showed an attractive process for WAS solubilization.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2010年第8期56-61,共6页
Environmental Pollution & Control
关键词
剩余污泥
超声波处理
热处理
酸碱调节
waste activated sludge（WAS）
sonication treatment
thermal treatment
acid-alkali adjustment
