褐铁矿强化污泥厌氧发酵及经济分析
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摘要
污泥厌氧发酵具有污染小,并且能获得能源物质的优势。然而污泥厌氧发酵效率低。探究了褐铁矿强化污泥厌氧发酵产甲烷的影响。结果表明褐铁矿存在能够提高污泥厌氧发酵产甲烷率;当褐铁矿含量由0增加至4%时,甲烷产量由101. 8 m L/g增加至128. 9 m L/g。褐铁矿能够促进污泥厌氧发酵水解过程;并且褐铁矿含量越高,溶解性COD的最大值越高。此外,褐铁矿促进污泥厌氧发酵过程短链脂肪酸(SCFA)的积累;当褐铁矿的含量为3%时,SCFA的最大积累量为4 025 mg/L,显著高于空白对照组。褐铁矿存在促进乙酸的积累;当褐铁矿含量由1%增加至4%时,乙酸含量由35%增加至42%。p H为7有利于褐铁矿强化污泥厌氧发酵;而碱性环境抑制甲烷产生。经济分析表明褐铁矿的最佳剂量为3%,总节约费用为329. 2元/t。
Sludge anaerobic fermentation has the advantages of less pollution and energy sources. However,the efficiency of sludge anaerobic fermentation is low. The effect of limonite on methane production from anaerobic fermentation of sludge was investigated. The results showed that the presence of limonite could improve the methane production rate of sludge anaerobic fermentation. When the content of limonite increased from 0 to 4%,the methane production increased from 101. 8 m L/g to 128. 9 m L/g. Limonite can promote anaerobic fermentation and hydrolysis of sludge,and the higher the content of limonite,the higher the maximum soluble COD. In addition,limonite promoted the accumulation of short-chain fatty acids( SCFA) during anaerobic fermentation of sludge. When the content of limonite was 3%,the maximum accumulation of SCFA was 4 025 mg/L,which was significantly higher than that of blank control group. Limonite promotes the accumulation of acetic acid. When the content of limonite increases from 1% to 4%,the content of acetic acid increases from 35% to 42%. The anaerobic fermentation of limonite sludge was enhanced by pH 7,while methane production was inhibited by alkaline environment.Economic analysis shows that the optimal dosage of limonite is 3%,and the total cost savings is 329. 2 yuan/t.
Sludge anaerobic fermentation has the advantages of less pollution and energy sources. However,the efficiency of sludge anaerobic fermentation is low. The effect of limonite on methane production from anaerobic fermentation of sludge was investigated. The results showed that the presence of limonite could improve the methane production rate of sludge anaerobic fermentation. When the content of limonite increased from 0 to 4%,the methane production increased from 101. 8 m L/g to 128. 9 m L/g. Limonite can promote anaerobic fermentation and hydrolysis of sludge,and the higher the content of limonite,the higher the maximum soluble COD. In addition,limonite promoted the accumulation of short-chain fatty acids( SCFA) during anaerobic fermentation of sludge. When the content of limonite was 3%,the maximum accumulation of SCFA was 4 025 mg/L,which was significantly higher than that of blank control group. Limonite promotes the accumulation of acetic acid. When the content of limonite increases from 1% to 4%,the content of acetic acid increases from 35% to 42%. The anaerobic fermentation of limonite sludge was enhanced by pH 7,while methane production was inhibited by alkaline environment.Economic analysis shows that the optimal dosage of limonite is 3%,and the total cost savings is 329. 2 yuan/t.
引文
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14黄天寅,巫华,吴玮,等.pH对污泥发酵产酸的影响[J].环境工程学报,2013,7(1):329-332Huang Tianyin,Wu Hua,Wu Wei,et al.Effects of pH value on acid production by sludge fermentation[J].Journal of Environmental Engineering,2013,7(1):329-332
15 Zhang J,Zhang Y,Quan X.Electricity assisted anaerobic treatment of salinity wastewater and its effects on microbial communities[J].Water Research,2012,46(11):3535-3543
2 Kumar G,Sivagurunathan P,Pugazhendhi A,et al.A comprehensive overview on light independent fermentative hydrogen production from wastewater feedstock and possible integrative options[J].Energy Conversion and Management,2017,141:390-402
3 Kumar G,Mudhoo A,Sivagurunathan P,et al.Recent insights into the cell immobilization technology applied for dark fermentative hydrogen production[J].Bioresource Technology,2016,219:725-737
4 Kim D H,Kim S H,Kim H W,et al.Sewage sludge addition to food waste synergistically enhances hydrogen fermentation performance[J].Bioresource Technology,2011,102(18):8501-8506
5 Zhang Y,Feng Y,Quan X.Zero-valent iron enhanced methanogenic activity in anaerobic digestion of waste activated sludge after heat and alkali pretreatment[J].Waste Management,2015,38:297-302
6 Feng Y,Zhang Y,Quan X,et al.Enhanced anaerobic digestion of waste activated sludge digestion by the addition of zero valent iron[J].Water Research,2014,52:242-250
7李川川,王进,岳正波,等.褐铁矿与石英砂作为反硝化生物滤池填料的比较[J].矿物学报,2016,36(2):260-264Li Chuanchuan,Wang Jin,Yue Zhengbo,et al.Comparison of limonite and quartz sand as denitrification biofilter fillers[J].Journal of Minerals,2016,36(2):260-264
8 Hansen T L,Schmidt J E,Angelidaki I,et al.Method for determination of methane potentials of solid organic waste[J].Waste Management,2004,24(4):393-400
9 Abdollahi M,Lay E N,Sanjari E.Experimental analysis on effects of cycling operation of methane adsorption and desorption on monolithic activated carbon[J].Energy Procedia,2017,141:332-338
10 Zhou Q,Jiang X,Li X,et al.The control of H2S in biogas using iron ores as in situ desulfurizers during anaerobic digestion process[J].Applied Microbiology and Biotechnology,2016,100(18):8179-8189
11 Zhang J,Zhang Y,Quan X,et al.Effects of ferric iron on the anaerobic treatment and microbial biodiversity in a coupled microbial electrolysis cell(MEC)-anaerobic reactor[J].Water Research,2013,47(15):5719-5728
12 Liu Y,Zhang Y,Ni B J.Zero valent iron simultaneously enhances methane production and sulfate reduction in anaerobic granular sludge reactors[J].Water Research,2015,75:292-300
13 Li X,Zhao J,Wang D,et al.An efficient and green pretreatment to stimulate short-chain fatty acids production from waste activated sludge anaerobic fermentation using free nitrous acid[J].Chemosphere,2016,144:160-167
14黄天寅,巫华,吴玮,等.pH对污泥发酵产酸的影响[J].环境工程学报,2013,7(1):329-332Huang Tianyin,Wu Hua,Wu Wei,et al.Effects of pH value on acid production by sludge fermentation[J].Journal of Environmental Engineering,2013,7(1):329-332
15 Zhang J,Zhang Y,Quan X.Electricity assisted anaerobic treatment of salinity wastewater and its effects on microbial communities[J].Water Research,2012,46(11):3535-3543
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