Faculty of Technology and Science, Karlstad University, Karlstad, Sweden.
Waste Manag. 2013 Apr;33(4):820-4. doi: 10.1016/j.wasman.2012.11.002. Epub 2013 Jan 5.
Residues from forest-industry wastewater-treatment systems are treated as waste at many pulp and paper mills. These organic substances have previously been shown to have potential for production of large quantities of biogas. There is concern, however, that the process would require expensive equipment because of the slow degradation of these substances. Pure non-fibrous sludge from forest industry showed lower specific methane production during mesophilic digestion for 19days, 53±26 Nml/g of volatile solids as compared to municipal sewage sludge, 84±24 Nml/g of volatile solids. This paper explores the possibility of using anaerobic co-digestion with municipal sewage sludge to enhance the potential of methane production from secondary sludge from a pulp and paper mill. It was seen in a batch anaerobic-digestion operation of 19 days that the specific methane production remained largely the same for municipal sewage sludge when up to 50% of the volatile solids were replaced with forest-industry secondary sludge. It was also shown that the solid residue from anaerobic digestion of the forest-industry sludge should be of suitable quality to use for improving soil quality on lands that are not used for food production.
制浆造纸厂的许多工厂将森林工业废水处理系统的残留物视为废物。这些有机物质以前被证明具有大量生产沼气的潜力。然而，人们担心由于这些物质降解缓慢，该过程将需要昂贵的设备。与市政污水污泥相比，在 19 天的中温消化过程中，来自林业的纯非纤维污泥的每克挥发性固体甲烷产量较低，为 53±26Nml/g，而市政污水污泥为 84±24Nml/g 的挥发性固体。本文探讨了与市政污水污泥进行厌氧共消化的可能性，以提高纸浆和造纸厂二级污泥产生甲烷的潜力。在为期 19 天的分批厌氧消化实验中，当用 50%的挥发性固体代替林业二级污泥时，市政污水污泥的特定甲烷产量基本保持不变。结果还表明，林业污泥厌氧消化的固体残留物的质量应适合用于改善非用于粮食生产土地的土壤质量。
