本文選題：城市固廢 + 生化降解�。� 參考：《浙江大學(xué)》2017年碩士論文

【摘要】：我國城市固廢以快速易降解的廚余組分為主,滲濾液產(chǎn)量大,容易引起填埋體水位過高,甚至使固廢堆體達到飽和狀態(tài)。集中填埋后的城市固廢因降解產(chǎn)生固相質(zhì)量損失,滲濾液中過高的VFA會影響生化降解的進行,液氣運移過程、生化反應(yīng)會造成堆體內(nèi)部能量的遷移,因此城市固體廢棄物堆體在生化降解趨于穩(wěn)定化的過程中處于多場耦合相互作用的狀態(tài)。通過建立THMCB多場耦合模型研究了城市固體廢棄物堆體內(nèi)的多場耦合作用,推導(dǎo)了多場耦合骨架位移、液氣運移、能量平衡、生化反應(yīng)以及溶質(zhì)遷移的控制方程,重點模擬了溫度對城市固廢中生化降解過程的影響。THMCB多場耦合模型包含了生化降解的二階段厭氧模型與好氧降解模型,可在嚴格厭氧、好氧、兼性環(huán)境下對城市固體廢棄物生化降解過程進行模擬,氧氣濃度為控制變量,當(dāng)氧氣濃度高于10%時,以好氧降解為主,氧氣濃度低于10%時以厭氧降解為主。對已有的生化降解反應(yīng)速率一級動力方程進行了修正,在水解反應(yīng)、甲烷化反應(yīng)、甲烷菌衰亡反應(yīng)的一級動力學(xué)方程中加入溫度影響函數(shù)�；贠GS軟件,通過數(shù)值計算分析了溫度對城市固廢中纖維素、總糖、蛋白質(zhì)和脂肪組分的厭氧降解過程的影響,并研究了不同溫度下的水解與甲烷化過程,研究結(jié)果表明,在10-45℃溫度范圍內(nèi),溫度會顯著影響水解與甲烷化進程的反應(yīng)速率。將大型模型槽試驗數(shù)據(jù)與數(shù)值計算結(jié)果進行對比,揭示了溫度在多場耦合作用中的影響。在填埋初期采用好氧降解模型進行了初步計算,模擬了填埋初期堆體內(nèi)的好氧降解過程導(dǎo)致的堆體內(nèi)溫度變化,模擬結(jié)果與模型槽試驗結(jié)果在填埋初期(1-20d)溫度上升趨勢保持高度一致。
[Abstract]:Urban solid waste in China is dominated by fast and easily degradable kitchen waste components. The leachate output is large, which can easily cause the water level of landfill to be too high, and even make the solid waste reactor reach saturation state. The mass loss of solid phase is caused by the degradation of municipal solid waste after concentrated landfill. The excessive VFA in leachate will affect the biodegradation, and the process of liquid gas migration and biochemical reaction will result in the transfer of energy in the body of the reactor. Therefore, the municipal solid waste reactor is in the state of multi-field coupling interaction in the process of biodegradation stabilization. The multi-field coupling in municipal solid waste reactor (MSW) was studied by establishing THMCB multi-field coupling model, and the governing equations of multi-field coupling skeleton displacement, liquid-gas transport, energy balance, biochemical reaction and solute transport were derived. The effect of temperature on the biodegradation process in municipal solid waste was simulated emphatically. THMCB multi-field coupling model included two-stage anaerobic model and aerobic degradation model of biochemical degradation, which could be used in strict anaerobic and aerobic processes. The biodegradation process of municipal solid waste was simulated in facultative environment. Oxygen concentration was the control variable. When oxygen concentration was higher than 10, aerobic degradation was dominant, and anaerobic degradation was the main factor when oxygen concentration was lower than 10. The first order kinetic equation of biodegradation rate was modified by adding the temperature effect function into the first-order kinetic equations of hydrolysis methanation and methanogen decay. Based on OGS software, the effects of temperature on the anaerobic degradation of cellulose, total sugar, protein and fat components in municipal solid waste were analyzed by numerical calculation. The hydrolysis and methanation processes at different temperatures were studied. In the temperature range of 10-45 鈩，

本文編號：1963723