Valencia R, den Hamer D, Komboi J, Lubberding H J, Gijzen H J
UNESCO-IHE Institute for Water Education, Delft, The Netherlands.
J Environ Manage. 2009 Feb;90(2):940-5. doi: 10.1016/j.jenvman.2008.02.007. Epub 2008 Apr 9.
Co-disposal of septic tank sludge had a positive effect on the municipal solid waste (MSW) stabilisation process in Bioreactor Landfill simulators. Co-disposal experiments were carried out using the Bioreactor Landfill approach aiming to solve the environmental problems caused by indiscriminate and inadequate disposal of MSW and especially of septic tank sludge. The simulator receiving septic tank sludge exhibited a 200 days shorter lag-phase as compared to the 350 days required by the control simulator to start the exponential biogas production. Additionally, the simulator with septic sludge apparently retained more moisture (>60% w/w), which enhanced the overall conversion of organic matter hence increasing the biogas production (0.60 m3 biogas kg(-1)VS(converted)) and removal efficiency of 60% for VS from the simulator. Alkaline pH values (pH>8.5) did not inhibit the biogas production; moreover it contributed to reduce partially the negative effects of NH(4)(+) (>2 g L(-1)) due to NH(3) volatilisation thus reducing the nitrogen content of the residues. Associated risks and hazards with septage disposal were practically eliminated as total coliform and faecal coliform contents were reduced by 99% and 100%, respectively at the end of the experiment. These results indicate that co-disposal has two direct benefits, including the safe and environmentally sound disposal of septic tank sludge and an improvement of the overall performance of the Bioreactor Landfill by increasing moisture retention and supplying a more acclimatised bacterial population.
在生物反应器填埋模拟器中，化粪池污泥的共处置对城市固体废物（MSW）稳定化过程具有积极影响。采用生物反应器填埋方法进行了共处置实验，旨在解决城市固体废物特别是化粪池污泥随意和不当处置所造成的环境问题。与对照模拟器开始指数级沼气生产所需的350天相比，接收化粪池污泥的模拟器的滞后期缩短了200天。此外，装有化粪池污泥的模拟器明显保留了更多水分（>60% w/w），这提高了有机物的整体转化率，从而增加了沼气产量（0.60立方米沼气·千克（-1）VS（转化）），并使模拟器中VS的去除效率达到60%。碱性pH值（pH>8.5）并未抑制沼气生产；此外，由于NH3挥发，它有助于部分减轻NH(4)(+)（>2克/升）的负面影响，从而降低残留物的氮含量。由于实验结束时总大肠菌群和粪大肠菌群含量分别降低了99%和100%，与污泥处置相关的风险和危害实际上已被消除。这些结果表明，共处置有两个直接好处，包括安全且环保地处置化粪池污泥，以及通过增加水分保留和提供适应性更强的细菌种群来改善生物反应器填埋的整体性能。
