基于OPMSE的畜禽养殖行业排放限值仿真

通过对清河流域畜禽养殖行业产生污水的各指标(BOD5,COD,NH_3-N)浓度进行统计,得出了排放污水中各污染物指标的浓度值范围。通过OPMSE的仿真计算,得出了排放污水经过BAT处理后,污染物浓度正态分布均值在90%,95%,99%置信水平下的置信区间。在置信水平为99%时,畜禽养殖行业的COD置信区间为(42.00,48.19),BOD_5置信区间为(7.47,8.74),NH_3-N置信区间为(6.78,7.88)。同时,依据仿真计算结果还得出了处理后污染物浓度的极小值和极大值,畜禽养殖行业的最佳出水COD,BOD_5,NH3_-N指标质量浓度分别为22.0,2.1,3.09 mg/L,最差出水COD,BOD_5,NH_3-N指标质量浓度分别为84.4,14.2,13.29 mg/L。将仿真结果与现有排放标准对比,拟定畜禽养殖行业的COD,BOD_5,NH_3-N直接排放限值分别为50,9,8 mg/L。

Simulation on Emission Limit Values for Livestock Industry Based on the OPMSE

The concentration range of different pollutants from the discharged sewage is obtained by analyzing the concentra-tion index of the discharged sewage from livestock industry in the Qinghe river basin .The confidence intervals at the 90% , 95% and 99% confidence levels of normal distribution means of pollution concentration are also acquired after being treated by BAT according to the simulating calculation of OPMSE .In the livestock industry ,the 99% confidence intervals of COD , BOD5 and NH3 - N are (42 .00 ,48 .19) ,(7 .47 ,8 .74) and (6 .78 ,7 .88) respectively .Meanwhile ,the maximum and minimum values of the treated pollutant concentrations are also obtained by simulating calculation .The optimum concentra-tions of COD ,BOD5 and NH3 - N of effluents from livestock industry are 22 .0 mg/L ,2 .1 mg/L and 3 .09 mg/L ,while the worst concentrations of COD ,BOD5 and NH3 -N of effluents from livestock industries are 84 .4 mg/L ,14 .2 mg/L and 13 .29 mg/L .Then making a comparison between the existing emission standards and simulating results ,new emission limits are determined preliminarily ,and the direct and interim emission limits of livestock industries are COD = 50 mg/L ,BOD5 = 9 mg/L ,NH3 - N = 8 mg/L respectively .