Nitrification of yellow waters in bed percolating of sand

ABSTRACT Ecological sanitation awares about the importance of a more efficient water reuse and the use of decentralized wastewater treatment systems. This paper describes the results of yellow waters’ nitrification in a biological reactor made up of simple materials, like sand as support material, aiming to make this liquid waste available for the use of mineralized nitrogen in sustainable agriculture. The experimental system was monitored through pH, dissolved oxygen (DO), total alkalinity (ALK), chemical oxygen demand (COD), total Kjeldahl nitrogen (TKN), ammonia nitrogen (AN), nitrite (NO- 2) and nitrate (NO- 3). The system showed good removal of organic matter and excellent conversion of nitrogen to nitrite and nitrate, with efficiency of transformation of TKN to nitrate of about 93%.

摘要 生态卫生理念认识到高效水回用与分散式污水处理系统应用的重要性。本文阐述了以砂石作为载体材料的简易生物反应器中黄色废水硝化反应的实验结果，旨在使该液态废弃物中的矿化氮可应用于可持续农业生产。本实验系统通过酸碱度、溶解氧（dissolved oxygen，DO）、总碱度（total alkalinity，ALK）、化学需氧量（chemical oxygen demand，COD）、凯氏总氮（total Kjeldahl nitrogen，TKN）、氨氮（ammonia nitrogen，AN）、亚硝酸盐（NO₂⁻）与硝酸盐（NO₃⁻）等指标进行监测。该系统对有机物具备良好的去除效果，且可高效将氮转化为亚硝酸盐与硝酸盐，其中凯氏总氮向硝酸盐的转化效率约为93%。