Michele Pognani, Giuliana D'Imporzano, Carlo Minetti, Sergio Scotti, Fabrizio Adani
Gruppo Ricicla - DiSAA, Università degli Studi di Milano, Soil and Env. Lab, Via Celoria, 2, 20133 Milano, Italy.
Gruppo Ricicla - DiSAA, Università degli Studi di Milano, Soil and Env. Lab, Via Celoria, 2, 20133 Milano, Italy; Gruppo Ricicla - DiSAA, Università degli Studi di Milano, Biomass and Bioenergy Lab., Parco Tecnologico Padano, Via Einstein, Loc. C.na Codazza, 26900 Lodi, Italy.
Waste Manag. 2015 Jan;35:111-8. doi: 10.1016/j.wasman.2014.09.009. Epub 2014 Oct 11.
Dry anaerobic digestion (AD) of OFMSW was optimized in order to produce biogas avoiding the use of solid inoculum. Doing so the dry AD was performed irrigating the solid waste with liquid digestate (flow rate of 1:1.18-1:0.9 w/w waste/digestate; 21d of hydraulic retention time - HRT) in order to remove fermentation products inhibiting AD process. Results indicated that a high hydrolysis rate of organic matter (OM) and partial biogas production were obtained directly during the dry AD. Hydrolysate OM was removed from digester by the percolate flow and it was subsequently used to feed a liquid anaerobic digester. During dry AD a total loss of 36.9% of total solids was recorded. Methane balance indicated that 18.4% of potential methane can be produced during dry AD and 49.7% by the percolate. Nevertheless results obtained for liquid AD digestion indicated that only 20.4% and 25.7% of potential producible methane was generated by adopting 15 and 20 days of HRT, probably due to the AD inhibition due to high presence of toxic ammonia forms in the liquid medium.
为了在不使用固体接种物的情况下生产沼气，对有机生活垃圾的干式厌氧消化（AD）进行了优化。为此，通过用液体沼液灌溉固体废物（流速为1:1.18 - 1:0.9重量比，废物/沼液；水力停留时间（HRT）为21天）来进行干式厌氧消化，以去除抑制厌氧消化过程的发酵产物。结果表明，在干式厌氧消化过程中直接获得了较高的有机物（OM）水解率和部分沼气产量。水解产物中的有机物通过渗滤液流从消化池中去除，随后用于进料液体厌氧消化池。在干式厌氧消化过程中，记录到总固体损失了36.9%。甲烷平衡表明，在干式厌氧消化过程中可产生18.4%的潜在甲烷，渗滤液可产生49.7%。然而，液体厌氧消化的结果表明，采用15天和20天的水力停留时间时，仅产生了20.4%和25.7%的潜在可生产甲烷，这可能是由于液体介质中高浓度的有毒氨形态抑制了厌氧消化。
