摘要
分别以海藻酸钠和聚乙烯醇(PVA)为包埋剂,采用蠕动泵滴加,包埋固定经驯化后的硫酸盐还原菌(SRB)占优的活性污泥。以小球强度、传质性能、成球难易为指标定性确定包埋条件。评价海藻酸钙(CA)法、PVA法、PVA混合载体法包埋小球对含铬废水的处理效果。结果表明以Cr(VI)去除率为考核指标,PVA混合载体为最好的包埋方式,其最优条件是PVA质量浓度为9%、包泥量为1∶1,添加少量的海藻酸钠,SiO2,CaCO3和粉末活性炭(PAC)有利于颗粒球传质与耐用性能的提高。在连续化处理含铬废水的工艺中,进水COD质量浓度为500mg/L,SO24-为500mg/L,Cr(Ⅵ)为100mg/L,水力滞留时间为6h的条件下,Cr(Ⅵ)的去除率为99.68%,出水总Cr质量浓度为0.45mg/L,COD质量浓度为187mg/L,同时铬以沉淀的形式与颗粒球分离有利于铬的回收。
The immobilized sulfate reducing bacteria （SRB）-containing activated sludge beads were prepared using sodium alginate and polyvinyl alcohol （PVA） as entrapment agent. The optimal conditions were chosen in terms of the mechanical stability, mass transfer, and difficulty of form ing beads. In addition, the treatment of chromium-containing wastewater by immobilized beads was investigated. The results show that PVA is considered the best support according to the removal of chromium, the optimal conditions are 9% PVA, ratio of immobilized cells to entrapping agents of 1 ： 1, and sodium alginate, SiO2, CaCO3 and powder active carbon （PAC） is added to improve the mass transfer and its durability, respectively. In the continuous experiments, the PVA mixed carrier process can effectively remove 100 mg/L Cr（Ⅵ） under the conditions of 500 mg/L sulfate, 500 mg/L chemical oxygen demand （COD） and 6 h hydraulic rest time （HRT）. In drainage outlet, the removal rate of Cr（Ⅵ）gets to 99.68%, and the total Cr concentration and COD are 0.45 mg/L and 187 mg/L respectively. Chromium is separated from beads in the form of Cr（OH）3, which is beneficial to the recycle of chromium.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第6期965-970,共6页
Journal of Central South University:Science and Technology
基金
湖南省科技计划重点资助项目(02CTY2003)
关键词
硫酸盐还原菌
包埋
海藻酸钠
聚乙烯醇
含铬废水
sulfate reducing bacteria
immobilization
sodium alginate
PVA
chromium-containing wastewater
