去除煤矿生活污水二级生化处理出水中NH3-N的试验研究

采用间歇式静态杯罐试验方法,对残余NH3-N浓度5～15mg/L的某煤矿生活污水二级生化处理出水进行了次氯酸钠氧化法去除研究,考察了不同的次氯酸钠溶液投加量和不同反应时间等因素对NH3-N去除效果的影响,研究了反应期间pH的变化情况。试验结果表明,次氯酸钠氧化法可以有效地去除残余NH3-N,对于本试验中的某煤矿生活污水二级生化处理出水,在最佳次氯酸钠投药量为0.1%（Vcl/VH2O）,最佳反应时间在30～50min,其对NH3-N去除率为65.3%,经过氧化处理后,其水质可以达到工业循环冷却水处理设计规范（GB50050-2007）中对NH3-N≤5mg/L的要求。

EXPERIMENTAL STUDY TO REMOVE AMMONIA NITROGEN FROM SECONDARY BIOCHEMICALTREATMENT EFFLUENT OF COAL MINE SEWAGE

This paper studied the sodium hypochlorite process to remove ammonia nitrogen,concentration from 5 to 15 mg/L,from secondary biochemical treatment effluent of coal mine sewage by the methods of static batch jar tests.It discussed the affects to remove ammonia nitrogen by different dosing of sodium hypochlorite solution and reaction time and the variable situations of pH during the reaction process.The experimental results indicated that the remnant ammonia nitrogen could be removed effectively by sodium hypochlorite process.In view of the secondary biochemical treatment effluent of coal mine sewage,the optimal dosing of sodium hypochlorite is 0.1%（Vcl/ VH2O）,the optimal reaction time is from 30min to 50min,the removal efficiency is 65.3%,and NH3-N is less than or equal to 5mg/L.The quality of effluent could be satisfied for code for design of industrial recirculating cooling water treatment（GB50050-2007）.