Treatment of Tanning Wastewater with Flyash-based Coagulant
PBS (flyash-based coagulant) made by fly ash in coalfired thermal power plants and blast furnace iron sludge extracted with a dilute H2SO4 was used as coagulant in the treatment of tanning wastewater. The influence of pH value, coagulant dosage and temperature on coagulation effect was investigated. The results showed that this coagulant had satisfactory results to treat tanning wastewater under the pH value ranging from 6 to 9, combined with polysilicate aluminium(PSA) flocculant. The removal rate of SS, S2-, Cr3+, CODCr and colority in tanning wastewater was 93.1%, 92.8%, 87.6%, 83.3％ and 90.8％ respectively in the condition where temperature was normal, pH value was 7.0 and coagulant dosage was 70mg/L. The temperature had little impact on the removal rate of CODcr. In comparison with the conventional coagulants, such as PAC (polyaluminium chloride) and PFS (polyferric sulfate), the coagulation performance of PBS coagulant was obviously superior to conventional coagulants. The coagulation mechanism of PBS coagulant in the treatment of tanning wastewater was also discussed．
Zhihui SUI Xin ZHAO Xihuai QIANG
School of Light Industry and Textile Engineering Qiqihar University Qiqihar, China Resource and Environment College Shaanxi University of Science and Technology Xi’an, China
国际会议
成都
英文
1-4
2010-06-18（万方平台首次上网日期，不代表论文的发表时间）