昆明某污水处理厂碳源分配研究与升级改造
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摘要
为优化改造方案,对昆明某污水处理厂进水碳源的种类、赋存形态及生物降解性进行了分析。结果表明,该污水处理厂进水中有机物的可生化性良好,但碳源种类较差,易生物降解有机物仅占进水有机物的10%~20%。通过分析进水碳源在生物处理过程不同途径中的利用比例,明确了该污水处理厂直接用于脱氮、除磷的碳源分别约占进水总碳源的15.9%和8.2%,约20%的碳源被用于微生物自身同化作用,47%的碳源被微生物氧化而无效浪费。从碳源分配角度出发,在原有氧化沟底部曝气单级A/O改造方案的基础上提出了两级A/O+分段进水改造方案,以实现系统对NH3-N与NO-3-N的同步去除。
The types,forms and biodegradability of carbon source in the influent of a wastewater treatment plant in Kunming City were analyzed to optimize a reconstruction scheme. The results showed that while the biodegradability of organics in the influent was good,the types of carbon source were poor,and easily biodegradable organics accounted for only 10% to 20% of the influent organics. Analyzing how carbon source was utilized in the biological treatment process indicated that the carbon source which was directly used for nitrogen and phosphorus removal accounted for about 15. 9% and 8. 2%,respectively.About 20% of carbon source was used for microbe assimilation,and 47% of carbon source was oxidized and effectively wasted. Considering the carbon source distribution,the two-stage A /O oxidation ditch and step feed scheme instead of the original single-stage A /O microporous aeration was put forward in order to remove NH3- N and NO-3- N simultaneously.
The types,forms and biodegradability of carbon source in the influent of a wastewater treatment plant in Kunming City were analyzed to optimize a reconstruction scheme. The results showed that while the biodegradability of organics in the influent was good,the types of carbon source were poor,and easily biodegradable organics accounted for only 10% to 20% of the influent organics. Analyzing how carbon source was utilized in the biological treatment process indicated that the carbon source which was directly used for nitrogen and phosphorus removal accounted for about 15. 9% and 8. 2%,respectively.About 20% of carbon source was used for microbe assimilation,and 47% of carbon source was oxidized and effectively wasted. Considering the carbon source distribution,the two-stage A /O oxidation ditch and step feed scheme instead of the original single-stage A /O microporous aeration was put forward in order to remove NH3- N and NO-3- N simultaneously.
引文
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[9]王先宝,金鹏康,王晓昌,等.昆明某污水厂氧化沟工艺的问题诊断及其解析[J].中国给水排水,2012,28(13):11-14.
[10]Guo C,Fu W,Chen X,et al.Nitrogen-removal performance and community structure of nitrifying bacteria under different aeration modes in an oxidation ditch[J].Water Res,2013,47(11):3845-3853.
[2]李金诗.不同碳源、C/N比对系统反硝化影响研究[D].武汉:武汉理工大学,2011.
[3]张智,陈杰云,李勇,等.处理低碳源污水的倒置A2/O工艺强化脱氮技术研究[J].中国给水排水,2009,25(13):7-12.
[4]熊鸿斌,夏晓宇,王玉芳,等.低C/N值城市污水处理厂出水达标的运行条件优化[J].中国给水排水,2013,29(1):92-96.
[5]Kim D,Kim T,Ryu H.Treatment of low carbon to nitrogen wastewater using two-stage sequencing batch reactor with independent nitrification[J].Process Biochem,2008,43(4):406-413.
[6]李桂荣,李雪,许文峰,等.解决城镇污水处理厂生物脱氮除磷所需碳源不足的方法综述[J].广东化工,2011,38(4):149-150.
[7]郭倩.低碳源污水同步脱氮除磷工艺优化研究[D].重庆:重庆大学,2012.
[8]付国楷,张春玲,喻晓琴,等.低碳源城市污水厂碳源优化利用运行模式研究[J].湖南大学学报:自然科学版,2012,39(8):61-66.
[9]王先宝,金鹏康,王晓昌,等.昆明某污水厂氧化沟工艺的问题诊断及其解析[J].中国给水排水,2012,28(13):11-14.
[10]Guo C,Fu W,Chen X,et al.Nitrogen-removal performance and community structure of nitrifying bacteria under different aeration modes in an oxidation ditch[J].Water Res,2013,47(11):3845-3853.