Influencing Factors of Limestone Sorption and its Usage in Advanced Wastewater Treatment for Phosphorus Removal
The aim of this article was to investigate the influencing factors of limestone(LS) adsorption for phosphorus removal and the effect of treating the effluent from a municipal wastewater treatment plant(MWTP).Firstly a series of batch experiments were conducted to study the influencing factors of LS for phosphorus(P) removal.Consequently,the P removal efficency increased with the temperature and contact time,and decreased with initial P concentration; smaller LS particle size enhanced the adsorption of limestone; the efficiency was over 90% when pH was below 6.37 and decreased with pH when it was above 8.15; sodium chloride as background electrolyte decreased the adsorption; organic acids such as tartaric acid,oxalic acid,and citric acid suppressed the adsorption,and citric acid especially showed to be effective materials for the regeneration of saturated substrate.Then a column study was conducted to evaluate the effect of the continuous vertical-flow limestone bed treating effluent from a MWTP with varying hydraulic retention times(HRTs).Over 80 days the effluent pH was between 7 and 9 which was suitable for growing plant.Shorter HRT such as 1 or 1.5h was recommended.It showed that LS as a effective absorbent,was suitable for the substrate in constructed wetland for advanced treating effluent from MWTPs.
limestone environmental engineering phosphorus substrate
LI Linyong ZHANG Hua WANG Dunqiu
Zhejiang Institute of Communication, Hangzhou 311112 College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, Ch
国际会议
合肥
英文
316-321
2012-05-24（万方平台首次上网日期，不代表论文的发表时间）