Frontiers of Environmental Science & Engineering
>> 2015,
Volume 9,
Issue 1
doi:
10.1007/s11783-014-0637-1
RESEARCH ARTICLE
Occurance and control of manganese in a large scale water treatment plant
1. Research Center for Eco-Environmental Sciences, Chinese Academy Sciences, Beijing 100085, China.2. Beijing Waterworks Group Co., Ltd., Beijing 100031, China.3. Beijing General Municipal Engineering Design and Research Institute, Beijing 100082, China
Accepted: 2014-02-21
Available online: 2014-12-31
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Abstract
The continuous variations of dissolved oxygen (DO), manganese (Mn), pH, and their effect on manganese removal by different water treatment processes are investigated. The results show that the declined DO concentration and pH value in the bottom of reservoir results in the increasing release of Mn from sediment to source water. Manganese concentration increased from 0.1 to 0.4 mg·L under the condition that DO concentration decreased from 12.0 to 2.0 mg·L in raw water. The different water treatment processes exhibited different efficiency on manganese removal. The processes with recycling of the suspended sludge, low elevation velocity in settling tank and slow filter rate, will benefit the manganese removal. During a high release of manganese in raw water, traditional coagulation-sedimentation and filtration could not completely remove Mn, although granular activated carbon filtration (GAC) had been applied. At that case, preoxidation with chlorine or potassium permanganate (KMnO ) was necessary to address the high manganese concentration.
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