Treating Low Carbon and Nitrogen Ratio Sewage With an A2O-BAF System
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摘要: 研究了A2O-BAF联合工艺处理低碳氮比生活污水时,A2O工艺段厌氧区、缺氧区和好氧区的最佳容积比及硝化液回流比,探讨了强化该工艺的反硝化除磷工艺条件.结果表明,在A2O水力停留时间为5.6 h、污泥龄为9d、污泥回流比100%、硝化液回流比200%、BAF HRT为30 min、出水溶解氧质量浓度为6~8 mg/L的工况下处理碳氮比为3.21的生活污水,系统存在反硝化除磷现象.调节A2O工艺段各区容积比,当比值为3∶4∶2时,系统的脱氮除磷效率最佳,总氮和总磷的去除率分别是67.4%和98.6%.结果表明,维持该容积比不变,改变硝化液回流比,硝化液回流比为250%时系统反硝化除磷效果最好,其中绝大多数的聚磷菌具有反硝化除磷的能力,缺氧区出水硝态氮和总磷的质量浓度几乎为0.该双污泥工艺能充分发挥活性污泥工艺与生物膜工艺的优势,尤其对于处理低碳氮比生活污水能达到良好的处理效果.Abstract: Using a A2O-BAF system to treat sewage with a low carbon and nitrogen ratio,the best volume ratio of anaerobic zone,anoxic zone,and aerobic zone of A2O and nitrite return ratio are investigated,and how to strengthen denitrifying dephosphatation is also researched.Results show that under the conditions of hydraulic retention time(HRT) 5.6 h,sludge retention time(SRT) 9 d,sludge return ratio 100%,nitrate recycle ratio 200% of A2O,HRT 30 min,and effluent ρ(DO) 6-8 mg/L of BAF,there exists dephosphatation in the system.When the volume ratio of anaerobic/anoxic/aerobic zone is 3∶4∶2,which not only satisfies the development of PAOs,but also suppresses reproduction of nitrifying bacteria,67.4% of TN and 98.6% of TP are removed.With the same volume ratio,when the nitrate return ratio is 250%,the dephosphatation efficiency is the best.Most of PAOs have the denitrifying dephosphatation ability,and the effluent nitrate nitrogen and TP are nearly 0.The two-sludge system can fully exert advantages of the activated sludge process and biological membrane technology.It is a suitable system for treating low carbon nitrogen ratio sewage and can achieve advanced phosphorus and nitrogen removal.
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Keywords:
- carbon and nitrogen ratio /
- volume ratio /
- nitrate return ratio
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