猪场废水厌氧氨氧化脱氮的短程硝化反硝化预处理研究

Nitritation-denitrification Process as a Pretreatment of ANAMMOX to Remove Nitrogen from Piggery Wastewater

在常温(13～20℃)、不调节pH的条件下,采用短程硝化反硝化预处理低C/N(2左右)猪场废水,考察了反硝化与亚硝化过程,并以经过短程硝化反硝化预处理的猪场废水为进水,分析了厌氧氨氧化的脱氮效果.结果表明,采用短程硝化反硝化预处理低C/N猪场废水,可以达到去除部分COD、部分脱氮、控制出水氨氮和亚硝态氮浓度之比在1∶1左右、pH在7.5～8.0左右的目的,为厌氧氨氧化创造了进水条件,全程COD和总氮平均去除率分别为64.3%和49.1%;经过短程硝化反硝化预处理的猪场废水,其厌氧氨氧化脱氮效果稳定,氨氮、亚硝态氮、总氮的平均去除率分别为91.8%、99.3%8、4.1%.

Piggery wastewater with low C/N was treated by using nitritation-denitrification process to attain a suitable influent for ANAMMOX at ambient temperature（13-20℃） without pH control. By using this process, part of total nitrogen and COD were removed, the ratio of ammonium and nitrite reached around 1 ： 1 and the pH was about 7.8, which were favorable for ANAMMOX. The average removal percentage of COD and total nitrogen were 64.3 % and 49.1% , respectively. Afterwards, nitrogen removal performance by followed ANAMMOX process was also investigated. Stable performance of ANAMMOX process was achieved and the removal percentage of ammonium, nitrite and total nitrogen were 91.8%, 99.3% and 84.1%, respectively.