生活污水预沉淀-SNAD颗粒污泥工艺小试

采用人工配水，在SBR反应器中启动同步短程硝化、厌氧氨氧化耦合反硝化（SNAD）颗粒污泥工艺，随后逐渐降低进水氨氮浓度，低氨氮稳定运行一段时间后通入预沉淀后生活污水，考察SNAD颗粒污泥工艺处理生活污水的脱氮性能及稳定性.结果表明，SNAD工艺启动成功后，氨氮去除率大于98%，总氮去除率在89%左右，随着进水氨氮浓度逐渐降低，亚硝酸盐氧化菌（NOB）活性升高，总氮去除率逐渐下降至75%左右.通入预沉淀生活污水（NH₄⁺-N 52~63 mg·L^-1，COD 99~123 mg·L^-1）后，平均总氮去除率为73.2%，出水COD浓度在35 mg·L^-1以下，最大出水氨氮和总氮浓度为0.7 mg·L^-1和12.8 mg·L^-1，连续30d以上出水氨氮和总氮浓度达到《城镇污水处理厂污染物排放标准》一级A排放标准，实现了生活污水碳氮同步高效去除的目的.

Pre-precipitation of Sewage-SNAD Granular Sludge Process Test

Using artificial water, the simultaneous partial nitrification, ANAMMOX (anaerobic ammonium oxidation), and denitrification (SNAD) granular sludge process was started in a sequencing batch reactor (SBR), and then the ammonia concentration in the influent was reduced gradually. After stable operation for a period of time under the low ammonia concentration, sewage treated by a pre-precipitation process was used as a substrate to investigate the performance and stability of the SNAD granular sludge process. The results show that after the SNAD process was successfully started, the ammonia removal rate was greater than 98%, and total the nitrogen removal rate was about 89%. As the influent ammonia concentration decreased, the nitride-oxidizing bacteria (NOB) activity was increased and the total nitrogen removal rate gradually decreased to 75%. When the pre-precipitated domestic sewage (NH₄⁺-N 52-63 mg·L^-1, COD 99-123 mg·L^-1) was used as the inflow, the average effluent removal rate of the total effluent was 73.2%, the effluent COD concentration was below 35 mg·L^-1, and the maximum effluent ammonia nitrogen and total nitrogen concentration were 0.7 mg·L^-1 and 12.8 mg·L^-1. The ammonia and total nitrogen concentration in the continuous 30 day effluent reached the 1A level of the integrated discharge standard of water pollutants for municipal wastewater treatment, indicating that the removal of organics and nitrogen from domestic sewage was achieved efficiently and synchronously.