大型机场污水处理改造工程实例

Example of a Wastewater Treatment Reconstruction Project in a Large Airport

某机场污水处理厂设计处理量为2.8×10^(4)m^(3)/d,原有生化处理工艺为厌氧-射流曝气氧化沟。改造工程要求出水水质达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准和广东省地方标准《水污染物排放限值》(DB 44/26—2001)第二时段一级标准两者中的较严值。在利用原有的预处理及深度处理设施基础上,生化处理改为厌氧-微孔曝气改良型Carrousel氧化沟,并优化了PAC加药系统。虽然进水水质浓度高于设计值,但运行结果显示改造后各污染物处理效果很好,对COD、BOD_(5)、TN、NH_(3)-N、TP和SS的去除率分别达到97.43%、97.83%、82.39%、98.27%、95.48%和97.15%,脱氮除磷效果提升明显,出水水质可稳定达到排放要求。

The original biological treatment process of a wastewater treatment plant with design capacity of 28000 m^(3)/d in an airport,was anaerobic and jet aeration oxidation ditch.It is required for the effluent quality of the reconstruction project to meet the stricter value of the first level A criteria in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002)and the first level criteria in the second period in Discharge Limits of Water Pollutants of local standards of Guangdong Province(DB 44/26-2001).Fully based on the existing pretreatment and advanced treatment facilities,the biochemical treatment was renovated into anaerobic and improved microporous aeration Carrousel oxidation ditch,and the dosing system of PAC was optimized.Although the influent concentrations were higher than the design value,the operation results showed that the treatment effect of various pollutants was very good after reconstruction.The removal rates of COD,BOD_(5),TN,NH_(3)-N,TP and SS were 97.43%,97.83%,82.39%,98.27%,95.48%and 97.15%respectively.The nitrogen and phosphorus removal effects were improved obviously,and the effluent quality can meet the discharge requirements stably.