提取木素并结合电解回收碱工艺处理制浆黑液
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摘要
采用传统碱回收方法处理黑液,在回收碱的过程中不仅烧掉了部分木素还会排放大量CO_2,造成环境污染。为解决这一问题,介绍一种处理制浆黑液的新方法。该方法工艺流程包括:酸化提木素(A)、冷冻结晶脱盐(D)、上流式活性污泥反应(UASB)、反渗透过滤(RO)和电解硫酸钠(E) 5个步骤。结果表明,经该方法处理后的木素得率为28. 09%,碱生成速率为2. 38 g/(h·L),电解硫酸钠溶液24 h碱回收率为50. 64%,再生氢氧化钠的电能消耗为1. 598 kWh/kg。
Black liquor is always treated by traditional alkali recovery method in which the biomass including lignin is burned to reduce the organic pollutants; and a large amount of CO_2 and other harmful gases are generated while generating sodium carbonate. In order to solve this problem,a new method was developed to treat pulping black liquor. The process included five steps: acidified precipitation( A),desalination by frozen crystallization( D),upflow activated sludge bed( UASB),reverse osmosis filtration( RO) and electrolysis( E). The experimental results ware,the yield of lignin was 28. 09% of the mass of the black liquid,the alkali production rate was 2. 38 g/( h·L),when electrolytic for 24 hours,the alkali recovery rate of sodium sulfate was 50. 64%,the electric energy consumption was 1. 598 kW h per 1 kg of sodium hydroxide.
Black liquor is always treated by traditional alkali recovery method in which the biomass including lignin is burned to reduce the organic pollutants; and a large amount of CO_2 and other harmful gases are generated while generating sodium carbonate. In order to solve this problem,a new method was developed to treat pulping black liquor. The process included five steps: acidified precipitation( A),desalination by frozen crystallization( D),upflow activated sludge bed( UASB),reverse osmosis filtration( RO) and electrolysis( E). The experimental results ware,the yield of lignin was 28. 09% of the mass of the black liquid,the alkali production rate was 2. 38 g/( h·L),when electrolytic for 24 hours,the alkali recovery rate of sodium sulfate was 50. 64%,the electric energy consumption was 1. 598 kW h per 1 kg of sodium hydroxide.
引文
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[2]Gaikwad B G,Thakur Y.Microbial treatment to black liquor.Asian[J].Research Chem,2015,8(2):113.
[3]Pan Jin Wei,Zhu Lin,Li DongDong,et al.Study on pollutant analysis and treatment measures of pulp and paper wastewater[J].Country.Agriculture.Farmers(B),2016(10):58.潘金伟,朱琳,李冬冬,等.制浆造纸废水污染物分析及治理措施研究[J].农村.农业.农民(B版),2016(10):58
[4]Wu ShouXiang.Analysis on the treatment technology of paper black liquor[J].Guangzhou Chemical Industry,2012(13):27.武首香.浅析造纸黑液的处理技术[J].广州化工,2012(13):27.
[5]JIANG Qipei,WANG Fuwei,ZHANG Yue.Study on the optimum conditions and fertilizer characteristics of phosphoric acid precipitation in straw black liquor[J].China Pulp&Paper,2013,32(2):73.江启沛,王富伟,张越.草浆黑液磷酸酸析最佳条件和肥料特性的研究[J].中国造纸,2013,32(2):73.
[6]Zhang ChunJing,Liu Yu.Analysis of black liquor components and determination of dissolvedlignin[J].Paper and Paper Making,2012(1):63.张春敬,刘玉.黑液成分分析及溶出木素的测定[J].纸和造纸,2012(1):63.
[7]Zhang Peng Peng.Analysis and research of fentonoxidation technology in wastewater treatment[J].Resources Economization&Environment Protection,2015(11):35.章鹏鹏.芬顿氧化技术在废水处理中的分析与研究[J].资源节约与环保,2015(11):35.
[8]Li KuanFeng,Wu Peng,Shen Yao Liang,et al.Current status and prospects of research on treatment of sulfate-containing wastewater[J].Technology of Water Treatment,2013(11):17.李宽峰,吴鹏,沈耀良,等.含硫酸盐废水处理研究现状与展望[J].水处理技术,2013(11):17.
[9]Attia AAA.New proposed system for freeze water desalination using auto reversed R-22 vapor compression heat pump[J].Desalination,2010,254(1):179.
[10]Randall D G,Zinn C,Lewis A E.Treatment of textile wastewaters using eutectic freeze crystallization[J].Water Science&Technology,2014,70(4):736.
[11]Yang Hui,Yao Yue-xin,Li Heng-song.Salinewater desalination investigation on the basis of freezing process[J].Technology of Water Treatment,2016,42(7):57.杨晖,姚越欣,李恒松.基于冷冻过程的海水浓缩实验研究[J].水处理技术,2016,42(7):57.
[12]Nguyen N C,Chen S S,et.al.Applicability of anintegrated moving sponge biocarrier-osmotic membrane bioreactor MD system for saline wastewater treatment using highly salt-tolerant microorganisms[J].Separation and Purification Technology,2018,198:93.
[13]Uygur A.Specific nutrient removal rates in saline wastewatertreatment using sequencing batch reactor[J].Process Biochemistry,2006,41:61.
[14]Curcio E,Ji X S,Quazi A M,et al.Hybrid nanofiltration-membrane crystallization system for the treatment of sulfate wastes[J].Membrane Sci,2010,360:493.
[15]Xiao ShiQuan,Reverse osmosis membrane pollution mechanism and prevention and control measures[J].Guangdong Chemical Industry,2016,43(335):119.肖世全,反渗透膜污染机理及防控措施[J].广东化工,2016,43(335):119.
[16]Zhou Yi Xuan,Wang Zhi,Dong ChenXi,et al.Biguanidine functionalized polyvinylamine modified reverse osmosis membrane with improved anti-bacterial property[J].CIESC Journal,2018,69(2):858.周艺璇,王志,董晨曦,等.双胍基化聚乙烯胺改性制备抗生物污染反渗透膜[J].化工学报,2018,69(2):858.
[17]Nong GuangZai,Zhou Zong Wen,Wang ShuangFei.Generation of hydrogen lignin and sodium hydroxide from pulping black liquor by electrolysis[J].Energies,2016,9:13.
[18]Nong Guang Zai,Lu Bing Chen,Li Shi Qiang.Cyclic treatment method for pulping black liquor acidified filtrate:China,CN 102877349A[P].2014-10-15.农光再,鲁炳辰,李世强,一种制浆黑液酸化滤液的循环处理方法:中国,CN 102877349A[P].2014-10-15.
[19]Nong GuangZai,Zhou Zong Wen,Li Ming,et al.Method for lignin extraction of pulping alkaline waste liquid combined with electrolytic recovery of sodium hydroxide:China,CN 104178777A[P].2014-10-03.农光再,周宗文,李明,等.制浆碱性废液的木素提取结合电解回收氢氧化钠的方法:中国,CN 104178777A[P].2014-10-03.
[20]Ceng Feng Chun,Xie WanRu,Ren Wang,et al.Study on corrosion and protection method of metal anode electrolytic cell in chlor-alkali production environment[J].Inorganic Chemicals Industry,2015,47(5):45.曾凤春,谢万如,任旺,等.氯碱生产环境下金属阳极电解槽的腐蚀探讨与防护方法研究[J].无机盐工业,2015,47(5):45.
[21]Yang Da Jin,Zuo Yi Zhuan,Study on mechanism of suspension electrolysis anodizing of high sulfur and arsenic[J].Yunnan Metallurgy,2003,32(10):58.杨大锦,左以专,高硫砷金精矿悬浮电解阳极氧化机理研究[J].云南冶金,2003,32(10):58.
[22]LIU Bo,CHEN Fei,YI Li,et al.Step by step separation and characterization of soybean straw and phylloxylin[J].Transactions of China Pulp and Paper,2016,31(1):37.刘波,陈飞,裔力,等.大豆秸秆和毛竹碱木素的逐级分离及性状表征[J].中国造纸学报,2016,31(1):37.
[23]Zhong Fei.Experimental study on the auxiliary electrolysis treatment of straw black liquor membrane[D].Nanjing:Nanjing Aerospace University,2002.钟飞.草浆黑液膜辅助电解处理的试验性研究[D].南京:南京航空航天大学,2002.
[24]ZHAO Ji,DING Zidong,WANG Xing,et al.Purification of lignin and its structure characterization[J].China Pulp&Paper,2016,35(3):29.赵吉,丁子栋,王兴,等.乙醇木素纯化及其结构表征[J].中国造纸,2016,35(3):29.