昆明市污水排水系统产甲烷规律的模拟实验研究

通过对昆明市餐饮和居民生活污水厌氧模拟实验研究,初步探讨生活污水中CH4的产生规律,实验结果表明,在自然条件下,餐饮和居民生活污水中产生的甲烷浓度最大值分别为1.63 mg/L和3.82 mg/L。并且将COD、硫酸盐、硫化物、TN的浓度变化与甲烷浓度变化进行Pearson简单相关性分析,结果表明,1/COD、COD/硫酸盐和1/TN与甲烷在置信度为0.01时极显著相关,硫化物与甲烷在置信度为0.05时不相关;COD、硫酸盐和TN浓度的变化对生活污水中甲烷的产生起关键性作用。对居民生活污水中甲烷产生规律进行温度和pH控制分析研究,实验结果表明,生活污水在25~30℃时,24 h内甲烷产生量最大值为8.6494 mg/L,明显大于其他温度段的甲烷产生量;在pH为7~8之间时,甲烷的产生量在24 h内达到的最大值为3.0477 mg/L,明显高于其他pH控制段的甲烷产生量。

Simulative experimental research of methane production in sewer systems in Kunming

The anaerobic simulation tests of dining and residential wastewater in Kunming were carried out in order to discuss the generation of CH 4.The results showed that the maximum of methane concentrations were 1.63 mg / L and 3.82 mg / L,respectively in dining and residential wastewater under natural conditions.And the effects of COD,sulfate,sulfide and TN concentration on methane concentration were analyzed.It showed that the 1 / COD,COD / sulfate 1 / TN and methane concentrations were significant in the confidence of 0.01.However the sulfide and methane concentrations were unrelated in the confidence of 0.05.It also showed that COD,sulfate and TN played important roles in methane production under anaerobic degradation.By conducting the temperature and pH in residential wastewater in 24 hours,it showed that the maximum of methane concentration was 8.6494 mg / L at 25 ~ 30℃.And the maximum of methane concentration was 3.0477 mg / L in the pH of 7 ~ 8.This generation concentration was obviously higher than others.