Experimental research on lime drying process of mechanical dewatered sludge from a wastewater treatment plant in Beijing
This paper studied the effects of lime treatment on the pre-dewatered sludge from a wastewater treatment plant in Beijing.The moisture,leaching solutions pH,heavy metals and organic matter content have been analyzed before and after lime treatment on the sludge.The results showed that:the moisture of the original sludge significantly impacted by the lime treatment.25% of lime dosage by weight was needed in the process of treating sludge moisture from 86.60% to 60%,while only 20% is needed in the process from 80.62% to 60%; The mixed materials pH has no significant difference after dosing more than 10% lime,all samples pH values were around 13 after lime treated 30min,the pH trend basic on 120d monitoring shows the pH was slightly declined but still above 12; Lime treatment on sludge has effects on immobilization of heavy metals.After dosing 10% of lime,the leaching solutions Ni,Cu,Zn contents dropped from 0.55 mg/L,2.42 mg/L and 1.09 mg/L to 0.13 mg/L,1.54 mg/L and 0.01 mg/L; Lime treatment on sludge has a promoted stabilization of organic matter.After dosing 10% and 20% of lime,the mixtures leaching solutions COD reduces sharply,from 1950mg/L to 298mg/L and 152 mg/L respectively.These indicate that lime treatment has obvious effect on sewage sludge stabilization.
Dewatered Sludge lime treatment sludge stabilization heavy metals
Xuan Liu Jin Shi Yuan Zhao Zifu Li Jian Zhang
School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing Wanruo Environmental Engineering and Technology Co.Ltd., Beijing, 100083, China
国际会议
The Seventh International Conference on Waste Management and Technology(第七届固体废物管理与技术国际会议(ICWMT7))
北京
英文
335-339
2012-09-05（万方平台首次上网日期，不代表论文的发表时间）