基于复合絮凝剂的SBR工艺中试研究
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摘要
为解决传统活性污泥法处理能力较低及占地大的问题,利用纳米型复合絮凝剂可使活性污泥快速沉降的特性,采用基于纳米型复合絮凝剂的SBR工艺处理市政污水。在SBR中试装置中,当纳米型复合絮凝剂投加量为20μL/L时,长期运行结果显示污泥性能稳定,污泥容积指数(SVI)<50 m L/g,表明污泥沉降速度已达到好氧颗粒污泥的水平。纳米型复合絮凝剂投加到水体后,通过吸附电中和作用促进絮凝,并利用大分子有机物的吸附架桥和卷扫等辅助作用,使污泥絮体及小颗粒迅速聚集成团下降,显著提升了出水水质。基于该纳米型复合絮凝剂的SBR出水水质可达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A要求。综上,该工艺适用于污水处理厂提标改造和延缓扩容的工程实践。
In order to solve the problem of low treating capacity and large footprint for the traditional activated sludge process,municipal wastewater was treated by SBR process based on nano-type composite flocculant through its property to accelerate rapid sedimentation of activated sludge. When the dosage of nano-type composite flocculant was 20 μL/L,the long-term operation results showed that the sludge was stable and sludge volume index (SVI) was less than 50 mL/g in the pilot-scale SBR,which indicated that the sludge settling velocity was equivalent to that of aerobic granular sludge. The addition of nano-type composite flocculant could accelerate the rapid aggregation and sedimentation of flocs and small particles through adsorption & electrical neutralization,adsorption bridging of macromolecular organics and auxiliary functions such as sweeping,which eventually improved the effluent quality. The effluent quality of SBR process based on composite flocculant could meet the first class A standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002).Therefore,the process is applicable for upgrading & reconstruction and delaying expansion of sewage treatment plants.
In order to solve the problem of low treating capacity and large footprint for the traditional activated sludge process,municipal wastewater was treated by SBR process based on nano-type composite flocculant through its property to accelerate rapid sedimentation of activated sludge. When the dosage of nano-type composite flocculant was 20 μL/L,the long-term operation results showed that the sludge was stable and sludge volume index (SVI) was less than 50 mL/g in the pilot-scale SBR,which indicated that the sludge settling velocity was equivalent to that of aerobic granular sludge. The addition of nano-type composite flocculant could accelerate the rapid aggregation and sedimentation of flocs and small particles through adsorption & electrical neutralization,adsorption bridging of macromolecular organics and auxiliary functions such as sweeping,which eventually improved the effluent quality. The effluent quality of SBR process based on composite flocculant could meet the first class A standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002).Therefore,the process is applicable for upgrading & reconstruction and delaying expansion of sewage treatment plants.
引文
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[3]Sadegh H,Ali G A M,Gupta V K,et al.The role of nanomaterials as effective adsorbents and their applications in wastewater treatment[J].Journal of Nanostructure in Chemistry,2017,7(1):1-14.
[4]Bueno D L C P,Gillerman L,Gehr R,et al.Nanotechnology for sustainable wastewater treatment and use for agricultural production:A comparative long-term study[J].Water Res,2017,110:66-73.
[5]Gehrke I,Geiser A,Somborn-Schulz A.Innovations in nanotechnology for water treatment[J].Nanotechnol Sci Appl,2015,8:1-17.
[6]吴玉杰.Nanofloc强化SBR工艺处理市政污水[D].合肥:合肥工业大学,2017.Wu Yujie.Nanofloc Enhanced SBR Process for Municipal Wastewater Treatment[D].Hefei:Hefei University of Technology,2017(in Chinese).
[7]晏井春,闫永胜,朱富坤,等.纳米聚硅氯化铝复合絮凝剂的制备、表征与应用研究[J].净水技术,2008,27(2):57-61.Yan Jingchun,Yan Yongsheng,Zhu Fukun,et al.Study on preparation,characterization and application of nanosized polyaluminum silicate chloride coagulant[J].Water Purification Technology,2008,27(2):57-61(in Chinese).
[8]李猛,崔康平,宫徽,等.纳米絮凝剂在SBR系统中的应用[J].中国给水排水,2018,34(19):96-100.Li Meng,Cui Kangping,Gong Hui,et al.Application of nano flocculant in SBR system[J].China Water&Wastewater,2018,34(19):96-100(in Chinese).
[9]周锋.污水处理厂应用絮凝+长纤维过滤提标改造试验研究[D].南京:东南大学,2015.Zhou Feng.The Experimental Research of Upgrading and Reconstruction of Seweage Treatment Plant Applying Flocculation+Long Fiber Filter[D].Nanjing:Southeast University,2015(in Chinese).
[10]Liu Y,Tay J H.State of the art of biogranulation technology for wastewater treatment[J].Biotechnol Adv,2004,22(7):533-563.
[11]Oikonomidis I,Burrows L J,Carliell-Marquet C M,et al.Mode of action of ferric and ferrous iron salts in activated sludge[J].J Chem Technol Biotechnol,2010,85(8):1067-1076.
[12]郝晓地,李天宇,吴远远,等.A2/O工艺用于污水处理厂升级改造的适宜性探讨[J].中国给水排水,2017,33(21):18-24.Hao Xiaodi,Li Tianyu,Wu Yuanyuan,et al.Discussion on suitability of A2/O process for upgrading of wastewater treatment plant[J].China Water&Wastewater,2017,33(21):18-24(in Chinese).
[13]de Bruin L M M,de Kreuk M K,van der Roest H F R,et al.Aerobic granular sludge technology:an alternative to activated sludge?[J].Water Sci Technol,2004,49(11/12):1-7.