摘要
从有机物降解及污泥产率2方面着手,考察了四环素(TC)对缺氧污泥的毒性作用,并研究了缺氧污泥对TC的去除效果。结果表明,TC对缺氧污泥的毒性随着TC初始含量的提高、接触时间的延长而增大。当TC的质量浓度由0提高到20 mg/L时,系统对有机物降解的抑制率由0提高到51.1%,污泥表观产率(m(COD)/m(MLSS))由0.46 g/g降为0;缺氧污泥主要通过快速吸附作用去除水中的TC,在TC的质量浓度分别为5、10、20 mg/L时,系统对水相中TC去除率分别为91.28%、90.09%、88.35%。随着TC含量的提高、反应周期的增加,缺氧污泥对TC的吸附平衡时间延长,吸附率降低。缺氧污泥对TC的吸附符合伪2级反应动力学模型(R2>0.999)。
A novel inorganic polymer composite flocculant-PAZSS （poly-aluminum zinc silicate sulfate） was synthesized by sodium silicate（Na2SiO3）, aluminum sulfate （Al2 （SO4） 3） and zinc sulfate（ZnSO4） under normal temperature and pressure. Taking Kaolin simulated wastewater as treating object, the influences of the concentration of Na2SiO3, the Zn/Al and （Al＋Zn）/Si molar rate on flocculation were investigated. XRD and infrared spectrum were used to test the structure and figure ofPAZSS flocculants. The results showed that when the concentration of Na2SiO3 was 0.4 tool/L, the molar ratio of Zn/A1 was 1.0, the molar ratio of （Al＋Zn）/Si was 1.0, the PAZSS flocculants had excellent turbidity removal efficiency. The turbidity removal efficiency was up to 98%. The results of XRD and infrared spectroscopic analysis showed that, the structure of flocculants transformed into reticular structure after adding aluminum ions and zinc ions. When compared with poly-aluminum silicate sulfate （PASS）, the flocculating performance was better than the latter one.
出处
《水处理技术》
CAS
CSCD
北大核心
2012年第12期70-72,77,共4页
Technology of Water Treatment
基金
国家水体污染控制与治理科技重大专项(2008ZX07314-002)
关键词
四环素
缺氧污泥
污泥产率
吸附
动力学
poly-aluminum zinc silicate sulfate（PAZSS）
inorganic flocculant
form
