【摘要】 研究了生物活性炭滤池中亚硝酸盐的生成规律,考察了pH值、进水氨氮质量浓度和溶解氧对亚硝酸盐生成的影响.试验结果表明,pH值大于7.6时亚硝酸盐沿水流方向呈逐渐增加的趋势,pH值在8.0附近亚硝酸盐积累出现最大值;进水氨氮质量浓度超过3 mg/L,出水亚硝酸盐氮质量浓度增加值在0.2 mg/L以上,进水氨氮质量浓度为4 mg/L时,能明显观测到亚硝酸盐积累;气水同向流时,进水溶解氧越低,亚硝酸盐积累现象越明显;气水逆向流时,基本上不会发生亚硝酸盐积累.更多还原

【Abstract】 This paper focuses on nitrite accumulation in biological activated carbon filter.The impacts of pH value,influent NH4+—N concentration and dissolved oxygen on nitrite accumulation are investigated in detail.The results show that the concentration of nitrite increases along the water flow when pH value is over 7.6 and comes to the maximum pH value at 8.0;when the NH4+ —N concentration of influent is over 3 mg/L,the increase of effluent nitrite concentration is more than 0.2 mg/L,when the NH4+ —N concentration of influent comes to 4 mg/L,the phenomena of nitrite accumulation could be observed obviously;in air-water current mode,the nitrite accumulation becomes more obvious when the influent dissolved oxygen of influent decrease,while in air-water countercurrent mode,nitrite accumulation hardly occurs.更多还原