预处理对造纸污泥和餐厨垃圾混合发酵的影响

为揭示联产氢气和甲烷复合工艺中预处理对物料液化水解率及系统产气性能的影响,利用不同浓度的酸(H2SO4)、碱(NaOH)预处理造纸污泥和餐厨垃圾混合物,在中温-高温条件下将预处理后的物料进行混合发酵联产氢气和甲烷,研究了不同浓度的酸/碱预处理后,造纸污泥和餐厨垃圾混合发酵联产氢气和甲烷性能.结果表明:酸/碱预处理对物料产生了明显的水解作用,物料中的大分子物质被降解为小分子颗粒;预处理对混合发酵产氢阶段具有明显的促进作用,其中以添加10%NaOH(以物料总固体计)的碱预处理效果最佳,其氢气产率较未经预处理的对照(CK)提高了50.20%,挥发性固体(VS)去除率达到了16.06%;预处理在产氢后的产甲烷阶段对甲烷产率没有明显的促进作用,各反应器的甲烷产率与CK相近或低于CK,VS总去除率也以CK为最高.

Effect of Pretreatment on Mixed Fermentation of Paper Mill Sludge and Food Waste

In order to reveal the effect of pretreatment on the organics hydrolysis and biogas production in the hydrogen-methane co-production process,a mesophilic-thermophilic anaerobic co-digestion of paper mill sludge(PS) and food waste(FW) pretreated with H2SO4 or NaOH in batch reactors was carried out,and the mixed fermentation performances of paper mill sludge and food waste pretreated with H2SO4 or NaOH at different concentrations were investigated.The results show that the pretreatment enhances the hydrolysis of organics and makes the macromolecular organic compounds degrade into micromolecular particles,and that the pretreatment obviously increases the hydrogen yield,especially the pretreatment with NaOH at the dosage of 10%(calculated on the basis of the mass of total solid),which results in a hydrogen yield increment of 50.20%(as compared with the check reactor) and a VS(Volatile Solids) removal of 16.06%.However,the pretreatment has no obvious effect on the methane production after the hydrogen fermentation,concretely,both the methane yield and the peak total VS removal are close to or less than that in the check reactor.