| Co-fermentation of food waste and municipal sewage sludge is an approach of wasteresourcization. A key technology for removal of nitrogen and sulfur was investigated in theprocess of co-fermentation of food waste and municipal sewage sludge, which aimed atimproving the resource utilization. In the condition of different ratios of food waste andmunicipal sewage sludge, the time of removal of nitrogen and sulfur was optimized. Thecertain time was signed to the first fermentation. Air stripping and the combination offlocculation and sedimentation were carried out to remove nitrogen and sulfur, respectively.After univariate analysis and orthogonal test, an optimum approach to removing nitrogenand sulfur in fermentation process was achieved in static and dynamic condition.Considering checking the effect of the key technology, the experiment aboutco-fermentation of food waste and municipal sewage sludge was conducted.The first-fermentation time was determined to12days,10days and9days in foodwaste and municipal sewage sludge ratios of1:2,1:1,2:1. Removal of Nitrogen and sulfurduring the fermentation in the mixing ratio of1:1, the Condition of continuousfermentation10days.Then determine that the best Removal of Nitrogen and sulfurconditions are stripping time10h, pH value is12, stripping strength of20L/h, The dosageof PAM is2.5mg/L. In the fermentation for40days, the results showed that the removalefficiency of VS, the amount of gas production and concentration of methane were56%,1.48m~3/kg·VS and44.73%, respectively. For30days, the removal efficiency of VS, theamount of gas production and concentration of methane were53.5%,1.28m~3/kg VS and41.75%, respectively. On the period of30days fermentation, for once fermentation, thetwice fermentations increase the key technologies of the Removal of Nitrogen andsulfur,.lead to results that the unit VS gas production increased1.28m~3/kg VS to2.1m~3/kg VS and the VS removal efficiency increased from53.5%to71%.The experimental results indicated that the technology for removal of nitrogen andsulfur enhanced the co-fermentation of food waste and municipal sewage sludge. Theachievements may offer a new opinion for the application of co-fermentation of food wasteand municipal sewage sludge. |
