基于新型光催化氧化的小微黑臭水体治理研究

Treatment of Small and Black-smelly Water Using a New Photocatalytic Oxidation Technology

小微水体被称作江河湖库的"毛细血管",小微黑臭水体治理关系治水成败,传统治理技术面临水质反复、水质提升难、需要清淤、环保性能差、维护不便等问题,该文基于中时间尺度(治理期4个月、维护期9个月)水塘原位现场试验研究,提出了一种治理小微黑臭水体的新型光催化氧化综合治理技术。结果表明,新型光催化氧化综合治理技术能够显著提升黑臭水塘水质,4个月的治理后水体透明度提高79.13%,溶解氧提高5.1倍,氧化还原电位提高1.44倍,COD、NH_(4)^(+)-N、TN和TP分别降低35.75%、69.74%、78.99%和39.47%;至9个月的维护期末,水体透明度提高了9倍,溶解氧提高了4.4倍,氧化还原电位提高了1.66倍,COD、NH_(4)^(+)-N、TN和TP分别降低67.60%、96.93%、90.97%和65.79%。污染负荷削减量分析表明,该技术治理期削减COD、NH_(4)^(+)-N、TN、TP分别为176.72、52.46、78.60和5.53 mg/(m^(3)·d),维护期削减COD、NH_(4)^(+)-N、TN、TP分别为64.55、6.89、4.85和0.47 mg/(m^(3)·d)。表明新型光催化氧化综合治理技术不需要清淤即可实现原位修复,能量来源为自然光能,且通过集成石墨烯光催化网、生物填料、生态浮床、水下森林构建技术培育适宜于小微水体长效维持的水生态健康系统,可实现黑臭水体水质达到地表水Ⅴ类及以上,治理环保、维护简便。该技术可用于原位环保消除小型相对封闭水体的黑臭并实现水质稳定提升。

Small water bodies are called the"capillaries"of rivers,lakes and reservoirs.The treatment of small black-and smelly water bodies is related to the success or failure of water treatment.High maintenance cost,dredging,not environmentally friendly,unstable water quality and increased risks of pollutant release are the critical challenges for the traditional treatment of small and black-smelly water.By integrating a new photocatalytic oxidation technology,this paper proposes a comprehensive treatment technology for the remediation of small and black-smelly.The field experiments in pond indicated that the dissolved oxygen increased by 5.1 times and the oxidation-reduction potential increased by 1.44 times after four months of treatment period.Besides,the transparency of water bodies increased by 79.13%,the concentration of COD,NH_(4)^(+)-N,TN and TP were decreased by 35.75%,69.74%,78.99%and 39.47%,respectively.After nine months of maintance period,the transparency of the water body increased by 9 times,the dissolved oxygen increased by 4.4 times,the oxidationreduction potential increased by 1.66 times,and the concentration of COD,NH_(4)^(+)-N,TN and TP were decreased by 67.60%,96.93%,90.97%and 65.79%,respectiely.On the one hand,this technology reduces the amount of COD,NH_(4)^(+)-N,TN and TP during the treatment period as 176.72,52.46,78.60 and 5.53 mg/(m^(3)·d),respectively.On the other hand,this technology reduces the amount of COD,NH_(4)^(+)-N,TN and TP during the maintenance period as 64.55,6.89,4.85 and 0.47 mg/(m^(3)·d),respectively.The results clearly prove that the new photocatalytic oxidation comprehensive treatment technology can eliminate black and odor,and the water quality can be steadily improved to ClassⅤand above of surface water quality standard over time,with no dredging,environmental friendly,and easy to maintain.This technology is suitable for eliminating the black and odor of small relatively closed water bodies and stabling improvement its water quality in the Guangdong-Hong Kong-Macao Greater Bay Area.