欢迎访问过程工程学报, 今天是

›› 2005, Vol. 5 ›› Issue (5): 509-513.

• 反应与分离 • 上一篇    下一篇

粉煤灰在稳定抗生素废水处理剩余污泥中的应用

相会强,杨宏,智艳生   

  1. 北京工业大学水质科学与水环境恢复工程北京市重点实验室
  • 出版日期:2005-10-20 发布日期:2005-10-20

Application of Fly Ash in Stabilization of Excess Sewage Sludge from Antibiotic Wastewater Treatment

XIANG Hui-qiang,YANG Hong,ZHI Yan-sheng   

  1. Key Lab. Beijing for Water Quality Science and Water Environment Recovery Engineering
  • Online:2005-10-20 Published:2005-10-20

PDF

摘要： 进行了利用粉煤灰稳定抗生素废水处理过程中产生的剩余污泥的实验. 粉煤灰与剩余污泥按4种比例、3种搅拌时间混合后，采用毒性特性浸取实验、平衡渗漏实验和长期渗漏实验考察重金属离子的渗漏性能. 考虑混合物的重金属离子浓度和病原菌的含量，粉煤灰和污泥的混合物可以农田利用. 在粉煤灰对重金属离子的固定机制中，表面络合作用在较宽的pH值范围内，尤其是在较低pH值时起主要作用，氢氧化物沉淀作用在较高pH值时是主要的作用机制. 实验还发现，粉煤灰固定金属离子的能力随其负荷的增加而增加. 本实验中，粉煤灰能除掉至少92.6%的微生物，粉煤灰的强碱性是杀死剩余污泥中微生物的主要原因.

关键词: 粉煤灰, 废水处理, 剩余污泥, 稳定

Abstract: Stabilization of excess sewage sludge from antibiotic production wastewater treatment with fly ash was studied. Fly ash and excess sewage sludge were mixed in four different ratios and three mixing times. Toxicity characteristics leaching procedure (TCLP), equilibrium leaching test (ELT), and long-term leaching test (LTLT) were used to investigate the leachability of heavy metals. Taking heavy metal ion concentration and pathogens into account, the mixture may be qualified to be used as soil conditioner for soil improvement application. Surface complexation and deposition (silicate and hydrate deposition) were the main mechanisms of fixation of heavy metals by fly ash. Surface complexation and silicate deposition worked in a relatively wider pH range, especially low pH. Hydrate deposition worked at higher pH. It was found that the fixing capacity increased with the increase of the loading rate of fly ash. In the study, fly ash can remove at least 92.6% of microorganism, and the high pH condition was considered to be the predominant reason for killing pathogens.

Key words: fly ash, wastewater treatment, excess sewage sludge, tabilization