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餐厨垃圾和厨余垃圾厌氧消化产生沼渣的脱水性能分析

何品晶1’2,周琪1,吴铎1,蔡涛1,彭伟1,吕凡1’2,邵立明1’2
(1同济大学固体废物处理与资源化研究所,上海200092;2住房和城乡建设部村镇建设司农村生活垃圾处理技术研究与培训中心,上海200092)

    摘要:以餐厨垃圾和厨余垃圾为原料进行中温厌氧消化反应,采用含固率(TS)、离心脱水后含固率(CTS)、模化毛细吸水时间(NCST)、过滤比阻(SRF)以及结合水含量(BW)为脱水性能评价指标,研究不同厌氧消化阶段产生沼渣的脱水性能。研究发现:沼渣TS变化范围为3.0%~9.9%,CTS为10.9%~31.0%,NCST为50.8~163.7 S·L·(g TS)-1,SRF为2.1×10”~13.8×10”m·kg-1,BW为2.3~15.1 g·(g TS)-1。厌氧反应器的累计甲烷产量始终是餐厨垃圾高于厨余垃圾,前者最高可达381 ml·(g VSadded)-1,而后者仅为280m1.(g VSadded)-1;沼渣的脱水性能主要受厌氧消化时间的影响。同时,以餐厨垃圾为原料的沼渣可以达到的脱水程度较高。而以厨余垃圾为原料的沼渣的脱水速率较快;沼渣TS与NCST、SRF和BW脱水指标的两两问相关性显著,而与CTS没有明显相关性。

关键词:厨余垃圾;餐厨垃圾;沼渣;脱水性能;累计甲烷产量
    DOI:10.3969/j.issn.0438—1157.2013.10.039

中图分类号:X 705 文献标志码:A 文章编号:0438—1157(2013)i0—3775—07

Dewaterability of digestate produced from restaurant food waste and household kitchen waste anaerobic digestion
HE Pinjing1,2,ZHOU Qi1,WU Duo1,CAI Tao1,PENG Weil,L0 Fanl”,SHAO Liming1,2
(1 Institute of Waste Treatment and Reclamation,Tongji University,Shanghai 200092,China;2 Centre forthe Technology Research and Training on Household Waste in Small Towns&Rural Area。Ministry ofHousing and Urban—Rural Development(MOHURD),Shanghai 200092,China)
    Abstract:Mesophilic anaerobic digestion(AD)on the feedstocks of household kitchen waste(HKW) and restaurant food waste(RFW)was performed.Five kinds of dewaterability indicators—total solids(TS),total solids after centrifugation(CTS),normalized capillary suction time(NCST),specific resistance to filtration(SRF)and bound water content(BW)were used to evaluate the dewaterability of digestate produced from different stages of AD.TS of digestate ranged from 3.0%to 9.9%,CTS ranged from 10.9%to 31.0%,SRF was 2.1×10”~13.8×1013 m·kg ,BW was 2.3—15.1 g·(g TS).1 and NCST was 50.8—1 63.7 S·L·(g TS)~.The cumulative methane yield of the digester fed with RFW was always higher than the digester fed with HKW,maximum cumulative methane yield of the former was up to 381  ml·(g VSadded)-1,while that of the latter was just 280 ml·(g VSadded)-1.The dewatering performance of digestate was mainly affected by duration of anaerobic digestion and the digestate produced from RFW was able to achieve a higher dewatering degree,while the dewatering rate of the digestate from HKW was higher.Furthermore,there were significant correlations among TS,normalized CST,SRF and BW of digestate,but the correlation with CST was not significant.
    Key words:household kitchen waste;restaurant food waste;digestate;dewaterability;cumulative methane yield
引言

厌氧消化工艺可以将有机物转变为可再生能源物质——沼气,用于产热、发电或者用作车用燃料。近年来,对可再生能源的需求和当前面I临的严峻环境问题,使得厨余垃圾和餐厨垃圾等生物质废物的厌氧消化利用受到越来越多的关注.

餐厨垃圾和厨余垃圾厌氧消化产生沼渣的脱水性能分析

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