城市污水厂脱水污泥好氧发酵强化技术及效果

Performance of Enhanced Aerobic Fermentation Technology of Dewatered Sludge in Urban WWTPs

以市政污水厂脱水污泥为主要原料,采用温度反馈控制的污泥好氧发酵设备,研究了翻抛模式、菌种以及活性炭辅料对污泥好氧发酵强化工艺的影响效果。试验结果表明:堆体翻抛模式在升温期采用时间控制,而在高温期温度控制,能缩短升温期延长高温期;添加耐高温菌种和活性炭能提升堆体升温速率,12 h内快速升温至60℃以上,高温期温度可提升至70℃以上,促进发酵产物快速腐熟;添加活性炭能增加堆体孔隙率,促进堆体内部充氧,提升好氧反应效率,同时实现水厂的废弃活性炭资源化利用。发酵产物参考有机肥料要求,用于种植油菜和波斯菊,通过对比试验看出,发酵产物明显增加植物生长速度,提升密度,强壮茎叶。发酵产物可用于园林绿化,提升土壤肥力,实现污泥资源化利用。

The municipal sludge aerobic fermentation enforced process and performance was researched in the sludge aerobic fermentation equipment with temperature feedback control system,using municipal dewatered sludge from wastewater treatment plants(WWTPs)as raw material,whereas the influence of the rollover mode,the bacterium strains and the active carbon(AC)addition etc were studied.The results showed that the heating phase would be shorten while the high-temperature phase would be delayed if the rollover mode of pile was time-controlled in heating phase and was temperature-controlled in high-temperature phase.Thermophilic bacteria and AC could also increase the pile heating speed,as up to 60℃within 12 h,and over 70℃during the high-temperature phase.Thus,the fermented product would be accelerated to mature.Moreover,the AC enlarges the pile porosity,helping oxygen diffusing deep inside,increasing aerobic reacting efficiency,as well as reusing the abandoned waste AC of the water treatment plants(WTPs).Referring to the organic manure requirement,the fermented product was applied to the rape&the calliopsis planting experiment.It showed that the fermented product obviously increased the plants growth rate and density with robust stems&leaves.The fermented product can be recycled into landscaping,increasing soil fertility,thus realizing the sludge resource utilizing.