石灰法草浆蒸煮废液厌氧消化的研究

STUDY ON ANAEROBIC DIGESTION OF LIME-STRAW PULPING WASTE LIGUOR

本研究在广泛调研的基础上,针对石灰法草浆蒸煮废液,采用厌氧消化工艺处理,进行了系列可行性试验.采用5升静态厌氧消化器,在35±1℃的条件下,逐渐提高投配率,对六组不同来源和不同配比的厌氧污泥进行培养驯化和比较试验,筛选4号污泥为种污泥.其中COD容积负荷为4～5kg/M^3d,水力停留时间为4～5天的条件下,COD去除率达70%以上,产气率为0.25M^3/kgCOD(去除),CH_4含量超过80%,V/V.进一步在工厂建立了自行设计的16升UASB和128升UASFB厌氧反应器,对石灰法草浆蒸煮废液进行厌氧处理,在COD浓度为12000～14000mg/l、水力停留时间(HRT)为1.1～1.2天和COD负荷为10～12kg/M^3d的条件下,其COD去除率达80%以上,产气率达0.45M^3/kgCOD(去除),CH_4含量超过65%,V/V.在试验取可得行性结论的过程中,对一些主要影响因素也做了较深入的探索研究,确证了某些参数.

Based on comprehensive survey, a summary dealing about the anaerobic digestion technology and its application to lime-straw pulping waste liquor was made and some suggestion was delivered. This paper is aimed at research on anaerobic digestion process of lime-straw pulping waste liquor and research on its feasibility test. With 5 litres static anaerobic digestors under the conditions of temperature 35 ± 1℃ and raising increasingly make-up ratio, Six groups of anaerobic sludge from different sources or with different combination ratio were cultured and compared. The most efficient result was obtained from sludge No.4. Under the conditions of COD volumetric 4～5 Kg/M^3·d and HRT 4～5 days, its COD reduction rate reaches more than 70% and gas production rate 0.25M^3/Kg COD (removed). CH_4 content exceeds 80%, v/v. Further, with the 16 litres UASB digestor and the 128 litres UASFB digestor with unique design, which established in the paper mill, under the conditions of COD concentration 12000～14000mg/1, HRT 1.1～1.2 days and COD load 10～12Kg/M^3·d, their COD reduction rates exceed 80%, gas production rates reach 0.45M^3/Kg COD (removed) or soCH_4 content exceeds 65%, v/v. The fundamental factors in fluencing the anaerobic digestion process and efficiency are also checked and discussed during the whole experiment.