Enhanced treatment of water with low turbidity:Combined effects of permanganate, PAM and recycled sludge
SUN Li-hua1, LV Mou2, YANG Yan-ling3, LIN Jian-lu4, ZHOU Ling-ling1, LI Gui-bai1
1.School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090,China;2.School of Environmental and Municipal Engineering, Qingdao Technological University, Qingdao 266033,China;3.School of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100022,China;4.Suzhou Litree Purifying Technology Co., LTD., Suzhou 215152,China
Abstract:
The effectiveness of enhancing treatment of water with low turbidity through combined effects of permanganate oxidation, PAM aiding coagulation and sludge recycling was investigated through continuous bench scale studies. In comparing with ferric chloride coagulation, only recycling sedimentation sludge was ineffective in enhancing treatment of water with low turbidity. PAM with recycled sludge showed positive effects, and the additional permanganate dosing exhibited the best potential of favoring coagulation, which leaded to much lower effluent turbidity and CODMn. Additionally, it was observed that the optimal permanganate dosage was 0.4 mg/L and the higher permanganate dosage exhibited inhibiting effects for pollutants removal. SEM analysis indicated that the flocs were loosely formed and the particle diameter was critically low for ferric chloride coagulation process. Comparatively, the addition of PAM and permanganate with recycled sludge facilitated the aggregation of tinny particles onto compact PAM polymer chains, therefore contributing to the formation of compact flocs with high particle diameter. The combined employment of recycled sludge, PAM and permanganate showed the best potential of favoring coagulation, mainly through synergistic effects between seeding, polymer bridging and increasing effective collision in mechanism. Additionally, the variation of Fe and Mn concentration after recycling and sedimentating units was studied for the processes, and the main species was also investigated for elements Fe and Mn. Sludge recycling and permanganate addition did not increase Fe and Mn concentration in the sedimented water.
Key words: water with low turbidity permanganate recycled sludge seeding polymer bridging
DOI：10.11916/j.issn.1005-9113.2009.06.023
Clc Number:X703
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Enhanced treatment of water with low turbidity:Combined effects of permanganate, PAM and recycled sl
本站小编 哈尔滨工业大学/2019-10-23
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