废白土热解残渣强化炼化剩余污泥水热液厌氧产能  

Enhancement of anaerobic digestion of refinery excess sludge hydrothermal liquid by pyrolytic residue of spent bleaching earth

作　　者：李晋[1] 谢萍 陈平 梁家豪 郭绍辉[1] 王庆宏[1] 陈春茂[1] LI Jin;XIE Ping;CHEN Ping;LIANG Jiahao;GUO Shaohui;WANG Qinghong;CHEN Chunmao(State Key Laboratory of Petroleum Pollution Control,China University of Petroleum-Bejing,Beijing 102249,China;Yan’an Refinery,Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Yan'an 727406,China;Changping Wastewater Treatment Plant of Beijing,Beijing 102200,China;Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control,Key Laboratory of Petrochemical Pollution Control of Guangdong Higher Education Institutes,School of Enironmental Science and Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,China)

机构地区：[1]中国石油大学(北京)化学工程与环境学院,石油石化污染物控制与处理国家重点实验室,北京102249 [2]陕西延长石油(集团)有限责任公司延安炼油厂,陕西延安727406 [3]北京市昌平污水处理中心,北京102200 [4]广东石油化工学院环境科学与工程学院,广东省石油化工污染过程与控制重点实验室,广东高校石油化工污染控制重点实验室,广东茂名525000

出　　处：《工业水处理》2022年第12期65-71,77,共8页Industrial Water Treatment

基　　金：国家自然科学基金(22278434);国家重点研发项目(2018YFC1801903-01,2019YFC1806201-01);广东石油化工学院人才引进项目(XJ2022000702)。

摘　　要：水热处理可以改善剩余污泥的脱水性能,提高减量化效果,副产的水热液含有高浓度有机物,可通过厌氧消化来回收能源。针对炼化剩余污泥水热液厌氧消化甲烷产率低的问题,并基于“以废治废”理念,开展了利用含油废白土热解残渣强化水热液厌氧消化产能的实验研究。结果表明,热解残渣(400 mg/L)可明显促进水解功能,CHO和CHNO类大分子有机物(分子质量>450 u)被有效降解;产酸性能被强化,挥发性脂肪酸(VFA)产率提高100%,质量浓度达到683 mg/L;厌氧消化的甲烷产率得以提升,每克COD的甲烷产量最高可达270 mL,较空白组提高了54%,伴随回收氢气137 mL/g。含油废白土热解残渣具有多孔结构,可为微生物附着提供位点,因此富集了Clostridium、Syntrophorhabdus等水解酸化细菌和Methanosaeta、Methanobacterium、Methanospirillum等产甲烷古菌。同时,其含有的金属元素可促进功能酶合成,并促进种间电子传递,使古菌可直接接收细菌产生的电子及H+并还原CO_(2)产生甲烷,从而提高了甲烷产率。该研究结果可为炼化固废资源化利用和能量回收提供一定理论参考。Hydrothermal treatment can improve the dewaterability and enhance the reduction effect of excess sludge.Hydrothermal liquid contains high concentration of organic matter,which can be converted into biogas for energy recovery through anaerobic digestion.Based on the concept of waste control by waste,pyrolytic residues of spent bleaching earth was used to enhance the anaerobic digestion capacity of hydrothermal liquid,to address the problem of low methane yield from anaerobic digestion of refinery excess sludge.The results showed that the pyrolysis residue(400 mg/L)could significantly promote the hydrolysis function,and macromolecular organic matters(molecular weight>450 u),especially CHO and CHNO were effectively degraded.Acid production was enhanced,and yield of volatile fatty acid(VFA)was increased by 100%with a mass concentration of 683 mg/L.The methane yield of anaerobic digestion was enhanced.The methane yield per gram of COD was up to 270 mL,which was 54%higher than that of blank group,accompanied by the recovery of 137 mL/g of hydrogen.The pyrolytic residues of spent bleaching earth has a porous structure that provides sites for microbial attachment,thus enriching hydrolytic acidifying bacteria such as Clostridium and Syntrophorhabdus and methanogens such as Methanosaeta,Methanobacterium and Methanospirillum.The metal elements pyrolysis residues contains can promote functional enzyme synthesis and interspecies electron transfer,so that methanogens can directly receive electrons and H+produced by bacteria and reduce CO_(2) to produce methane,thus improving methane yield.It can provide some theoretical reference for the resource utilization and energy recovery of refining and chemical solid waste.

关 键 词：水热液 厌氧消化 废白土 热解残渣 以废治废 

分 类 号：X703.1[环境科学与工程—环境工程]