倒置A~2/O工艺处理河道水脱氮除磷效果研究
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摘要
布吉河为深圳河的上游支流,深圳河为深圳河香港两地的分界河,对两个城市的生活、经济有重要影响。城市河流在城市的功能中具有重要作用,河流污染会造成城市环境恶化、生态环境失衡,进而影响两岸居民的正常生活,甚至制约城市经济的发展。由于经济的发展,布吉河受到了严重的污染,而深圳河50%的污染来自于布吉河,因此布吉河污染的治理具有非常重要的意义。
试验采用倒置A~2/O(Anoxic/Anaerobic/Oxic)工艺反应器对布吉河道水进行处理。倒置A2/O工艺将缺氧段置于反应器前端,优先满足系统的反硝化,强化了对氮的去除效果,对磷的去除效果也有所增强,适于处理碳氮比低的南方河道水。反应系统的水力停留时间(HRT)为11h,污泥龄(SRT)为22d,内回流比为200%,外回流比为75%。
反应器的运行试验结果表明,倒置A2/O工艺反应器对布吉河有很好的处理效果,反应器出水COD总体水平能达到《城镇污水处理厂污染物排放标准》GB18918—2002中的国家二级标准(100 mg/L),多数情况下能达到国家一级B标准(60 mg/L),去除率平均为70.6%;出水BOD5达到国家一级B标准(20 mg/L),平均去除率为91%;出水TN整体水平达到国家一级B标准(20 mg/L),平均去除率为44%;出水TP达到国家二级标准(3 mg/L),平均去除率为46.6%。
试验考察了Ni、Cu、Zn、Pb、Cr和Cd 6种重金属冲击对反应器处理效果的影响。结果表明,重金属种类不同,其对反应器的影响也不尽相同,6种重金属中,氯化铬对反应器出水COD有很大影响,硫酸铜对反应器出水氨氮浓度有一定影响,乙酸铅和氯化铬对反应器出水TP有很大影响,氯化镉和硫酸铜对反应器出水的浊度有很大影响。结果表明,无论哪种金属对反应器的冲击,24h后反应器均能恢复正常,说明反应器有较强的抗重金属冲击的能力。
Urban rivers play an important role in urban living and city economy. When rivers are polluted, it will cause the deterioration of city environment and ecological imbalance; hence limit the development of city economy. Shenzhen River is a boundary river between Hong Kong and Shenzhen, and is of great significance to both cities. Buji River is the upstream branch of Shenzhen River which is heavily polluted due to the area’s economy development. 50% pollution of Shenzhen River comes from Buji River. As a result, the treatment of Buji River becomes extremely urgent.
This experiment adopted inverted A2/O(Anoxic/Anaerobic/Oxic)process reactor to carry out the treatment of polluted Buji River. Inverted A2/O process is a pre-denitrification technology; it strengthens the ability of nitrogen removal. Inverted A2/O process reactor is suitable for the treatment of southern river water with lower ratio of carbon to nitrogen. The operation parameters of the reactor are: hydraulic retention time (HRT) is 11h, sludge retention time (SRT) is 22d, inner recycling ratio is 200%, sludge return ratio is 75%.
Results of the reactor running experiment show that: Effluent COD concentration is below national wastewater discharge gradeⅡstandard(100 mg/L) according to discharge standard of pollutants for municipal wastewater treatment plant GB18918—2002, and under most conditions, it is below national gradeⅠB standard (60 mg/L). The average removal rate of COD is 70.6%; Effluent BOD5 concentration is below national wastewater discharge gradeⅠB standard (20 mg/L), and the average removal rate of BOD5 is 91%; Effluent TN concentration is below national wastewater discharge gradeⅠB standard(20 mg/L), and the average removal rate of TN is 44%; Effluent TP concentration is below national wastewater discharge gradeⅡs tandard (3 mg/L), and the average removal rate of TP is 46.6%. In a word, the inverted A2/O process reactor performs well in treating the polluted Buji river water.
An experiment was carried out on six heavy metals, Ni、Cu、Zn、Pb、Cr and Cd. Each heavy metal has a different effect on the reactor. The results indicate that: chromium chloride affects effluent COD concentration a lot; copper sulfate has certain influence on effluent ammonia nitrogen concentration; lead acetate and chromium chloride have a great impact on effluent TP concentration; cadmium chloride and copper sulfate affect effluent turbidity greatly. The result shows that, the reactor will turn to normal no matter which heavy metal affects.
试验采用倒置A~2/O(Anoxic/Anaerobic/Oxic)工艺反应器对布吉河道水进行处理。倒置A2/O工艺将缺氧段置于反应器前端,优先满足系统的反硝化,强化了对氮的去除效果,对磷的去除效果也有所增强,适于处理碳氮比低的南方河道水。反应系统的水力停留时间(HRT)为11h,污泥龄(SRT)为22d,内回流比为200%,外回流比为75%。
反应器的运行试验结果表明,倒置A2/O工艺反应器对布吉河有很好的处理效果,反应器出水COD总体水平能达到《城镇污水处理厂污染物排放标准》GB18918—2002中的国家二级标准(100 mg/L),多数情况下能达到国家一级B标准(60 mg/L),去除率平均为70.6%;出水BOD5达到国家一级B标准(20 mg/L),平均去除率为91%;出水TN整体水平达到国家一级B标准(20 mg/L),平均去除率为44%;出水TP达到国家二级标准(3 mg/L),平均去除率为46.6%。
试验考察了Ni、Cu、Zn、Pb、Cr和Cd 6种重金属冲击对反应器处理效果的影响。结果表明,重金属种类不同,其对反应器的影响也不尽相同,6种重金属中,氯化铬对反应器出水COD有很大影响,硫酸铜对反应器出水氨氮浓度有一定影响,乙酸铅和氯化铬对反应器出水TP有很大影响,氯化镉和硫酸铜对反应器出水的浊度有很大影响。结果表明,无论哪种金属对反应器的冲击,24h后反应器均能恢复正常,说明反应器有较强的抗重金属冲击的能力。
Urban rivers play an important role in urban living and city economy. When rivers are polluted, it will cause the deterioration of city environment and ecological imbalance; hence limit the development of city economy. Shenzhen River is a boundary river between Hong Kong and Shenzhen, and is of great significance to both cities. Buji River is the upstream branch of Shenzhen River which is heavily polluted due to the area’s economy development. 50% pollution of Shenzhen River comes from Buji River. As a result, the treatment of Buji River becomes extremely urgent.
This experiment adopted inverted A2/O(Anoxic/Anaerobic/Oxic)process reactor to carry out the treatment of polluted Buji River. Inverted A2/O process is a pre-denitrification technology; it strengthens the ability of nitrogen removal. Inverted A2/O process reactor is suitable for the treatment of southern river water with lower ratio of carbon to nitrogen. The operation parameters of the reactor are: hydraulic retention time (HRT) is 11h, sludge retention time (SRT) is 22d, inner recycling ratio is 200%, sludge return ratio is 75%.
Results of the reactor running experiment show that: Effluent COD concentration is below national wastewater discharge gradeⅡstandard(100 mg/L) according to discharge standard of pollutants for municipal wastewater treatment plant GB18918—2002, and under most conditions, it is below national gradeⅠB standard (60 mg/L). The average removal rate of COD is 70.6%; Effluent BOD5 concentration is below national wastewater discharge gradeⅠB standard (20 mg/L), and the average removal rate of BOD5 is 91%; Effluent TN concentration is below national wastewater discharge gradeⅠB standard(20 mg/L), and the average removal rate of TN is 44%; Effluent TP concentration is below national wastewater discharge gradeⅡs tandard (3 mg/L), and the average removal rate of TP is 46.6%. In a word, the inverted A2/O process reactor performs well in treating the polluted Buji river water.
An experiment was carried out on six heavy metals, Ni、Cu、Zn、Pb、Cr and Cd. Each heavy metal has a different effect on the reactor. The results indicate that: chromium chloride affects effluent COD concentration a lot; copper sulfate has certain influence on effluent ammonia nitrogen concentration; lead acetate and chromium chloride have a great impact on effluent TP concentration; cadmium chloride and copper sulfate affect effluent turbidity greatly. The result shows that, the reactor will turn to normal no matter which heavy metal affects.
引文
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