SiO_3~(2-)浓度对KMnO_4/FeSO_4工艺除磷过程的影响
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摘要
考察了天然水体中常见的SiO_3~(2-)对KMnO_4/FeSO_4工艺混凝除磷的影响。SiO_3~(2-)存在时KMnO_4/FeSO_4工艺混凝除磷的效能随着溶液pH的升高呈现先增加后降低的趋势。SiO_3~(2-)浓度为1.0 mmol/L,溶液pH值为4～6时,SiO_3~(2-)可促进KMnO_4/FeSO_4工艺除磷的效能,KMnO_4/FeSO_4工艺对磷的去除效果分别增加了6.0%,9.9%和6.3%;溶液pH值为7～9时,SiO_3~(2-)可显著抑制KMnO_4/FeSO_4工艺除磷的效能,KMnO_4/FeSO_4工艺对磷的去除效果分别降低了14.76%,32.6%和17.3%。KMnO_4/FeSO_4工艺形成的絮体颗粒物表面ζ电位显著降低,溶液中残余铁的量明显提高。另外,水中SiO_3~(2-)对KMnO_4/FeSO_4工艺形成的絮体颗粒物的组成和表面特征均有一定影响。该研究为KMnO_4/FeSO_4工艺混凝除磷技术的推广提供了必要的理论基础。
Effects of SiO_3~(2-) in natural source water on phosphate removal by FeSO4/KMnO4 process are investigated. The removal efficiency of phosphate increases firstly and decreases subsequently with the increase of pH values in the presence of SiO_3~(2-). The present of SiO_3~(2-)(1.0 mmol/L)promotes the efficiency of phosphate removal in pH values of 4―6 and removal of phosphate enhances by 6.0%,9.9% and 6.3%. In contrast,with the increase of pH values(7―9),removal of phosphate significantly decreases by 14.76%,32.6% and 17.3%. SiO_3~(2-) reduces the surface ζ potential of floc particles formed in situ and increases the amount of residual iron in the solution. In addition,SiO_3~(2-) has a certain influence on composed elements and surface features for floc particles formed the KMnO_4/FeSO_4 process. The results provide a necessary theoretical foundation for the practical application of KMnO_4/FeSO_4 process for phosphate removal.
Effects of SiO_3~(2-) in natural source water on phosphate removal by FeSO4/KMnO4 process are investigated. The removal efficiency of phosphate increases firstly and decreases subsequently with the increase of pH values in the presence of SiO_3~(2-). The present of SiO_3~(2-)(1.0 mmol/L)promotes the efficiency of phosphate removal in pH values of 4―6 and removal of phosphate enhances by 6.0%,9.9% and 6.3%. In contrast,with the increase of pH values(7―9),removal of phosphate significantly decreases by 14.76%,32.6% and 17.3%. SiO_3~(2-) reduces the surface ζ potential of floc particles formed in situ and increases the amount of residual iron in the solution. In addition,SiO_3~(2-) has a certain influence on composed elements and surface features for floc particles formed the KMnO_4/FeSO_4 process. The results provide a necessary theoretical foundation for the practical application of KMnO_4/FeSO_4 process for phosphate removal.
引文
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[12] ROBINSON R B,REED G D,FRAZIER B. Iron and manganese sequestration facilities using sodium silicate[J]. Journal-American Water Works Associat-ion,1992,84(2):77-82.
[2]茹改霞.富营养化水体除磷技术的研究进展[J].广东化工,2017,44(23):100-114.RU Gaixia. Research progresses of phosphorus remov-al technologies of eutrophic water[J]. Guangdong Chemical Industry,2017,44(23):100-114.
[3]左军,黄志金,王莉,等.混凝-吸附联用工艺去除水中磷的中试研究[J].水资源与水工程学报,2014,25(1):169-172.ZUO Jun,HUANG Zhijin,WANG Li,et al. Pilot study on removal of phosphorus from water by combined process of coagulation and adsorption[J].Journal of Water Resources&Water Engineering,2014,25(1):169-172.
[4] NGUYEN T A H,NGO H H,GUO W S,et al.Modification of agricultural waste/by-products for enhanced phosphate removal and recovery:Potential and obstacles[J]. Bioresource Technology,2014,169(5):750-762.
[5] BENYOUCEF S, AMRANI M. Adsorption of phosphate ions onto low cost Aleppo pine adsorbent[J]. Desalination,2011,275(1/2/3):231-236.
[6]赵辉,邱小云,龚小芝,等.化学法去除循环水排污水中的磷[J].化工环保,2016,36(5):523-526.ZHAO Hui,QIU Xiaoyun,GONG Xiaozhi,et al.Phosphorus removal of circulating waste water by chemical method[J]. Environmental Protection of Chemical Industry,2016,36(5):523-526.
[7] LIU Ke, SUN Jianhong, ZHOU Tao. Effects of inorganic ions on phosphorus removal with Fe/Mn oxide formed in situ by KMnO4-Fe2+process[C]//2014 International Conference on Energy,Environment and Green Building Materials. The Netherlands:CRC Press/Balkema,2014:277-280.
[8] DAVIS C C. Aqueous silica in the environment:Effects on iron hydroxide surface chemistry and implications for natural and engineered systems[D].Virginia, USA:Virginia Polytechnic Institute and State University,2000:64-65.
[9] NDIAYE P I,MOULIN P,DOMINGUEZ L,et al.Treatment of silica effluents:Ultrafiltration or coagu-lation-decantation[J]. Journal of Hazardous Materials,2004,116(1/2):75-81.
[10]刘可,余敏,马军,等. FeSO4/KMnO4工艺混凝处理微污染源水的研究[J].中国给水排水,2010,26(17):92-94.LIU Ke,YU Min,MA Jun,et al. FeSO4/KMnO4coagulation process for purification of micro-polluted source water[J]. Chinawater&Wastewater,2010,26(17):92-94.
[11] BLANEY L M,CUNAR S,SENGUPTA A K.Hybrid anion exchange for trace phosphate removal from water and wastewater[J]. Water Research,2007,41(7):1603-1613.
[12] ROBINSON R B,REED G D,FRAZIER B. Iron and manganese sequestration facilities using sodium silicate[J]. Journal-American Water Works Associat-ion,1992,84(2):77-82.