非洲國家的可再生資源豐富,但是要利用這些資源有很大的挑戰(zhàn)。利用隨處丟棄的農(nóng)業(yè)廢棄物包括牛糞和玉米秸稈開發(fā)新能源比如生產(chǎn)沼氣將減少對傳統(tǒng)新柴燃燒方式的依賴。傳統(tǒng)燃燒方式造成了環(huán)境的負面影響,包括室內(nèi)環(huán)境污染,森林砍伐和土壤退化。本項研究的目的是以牛糞和玉米秸稈為原料進行沼氣干發(fā)酵研究,實驗其消化特性,主要針對不同發(fā)酵原料配比、消化溫度和水力滯留時間等參數(shù)進行,小試規(guī)模。試驗結(jié)果如下： (1)中溫消化啟動階段是在常溫條件22-28℃進行,之后的半連續(xù)發(fā)酵是采用中溫35±1。C。啟動過程是28天,順利進行,最大日產(chǎn)氣量為8.63L·d-1出現(xiàn)在啟動開始后的第八天,第28天日產(chǎn)氣量降到最低點為1.32L·d-1。 (2)通過秸稈與牛糞混合而提高了原料的C/N,同時原料的空隙率也得以提升這有利于物料間的傳質(zhì)。在中溫消化中,最高裝置產(chǎn)氣率1.30L·(Ld)-1是在HRT為30d的條件下獲得的,此時的原料產(chǎn)氣率是0.57L·(gVS)-1。 (3)高溫沼氣干發(fā)酵的啟動和運行管理比中溫條件更困難。通過增加啟動過程接種污泥量等方法,使高溫沼氣干發(fā)酵(55士1℃)得以實施。隨著投料增加產(chǎn)氣量也明顯增加,...

【文章頁數(shù)】：58 頁

【學(xué)位級別】：碩士

【文章目錄】：
摘要
Abstract
Table of Contents
List of Tables
List of Figures
List of Abbreviations
1. Introduction
    1.1 General Introduction
    1.2 Literature Review
        1.2.1 Anaerobic Digestion
        1.2.2
        1.2.3 Dry anaerobic Digestion
        1.2.4 Dissemination and Bottleneck of African Biogas Technology
    1.3 Objectives and Content of Study Work
        1.3.1 Objective and Significance
        1.3.2 Scope of the Study Work
2. Co-digestion of Cowdung and Corn Straw under Mesophilic Dry Anaerobic Digestion
    2.1 Introduction
    2.2 Methods and Material
        2.2.1 Raw Material
        2.2.2 Anaerobic Reactor
        2.2.3 Startup and Operation
        2.2.4 Analytical Methods
    2.3 Results and Discussion
        2.3.1 Startup Phase Process
        2.3.2 Substrate Ratio Effect on Co-digestion of Cowdung and Corn Straw
        2.3.3 Evaluation of Substrate Ratio Deals
        2.3.4 HRT Effect on Co-digestion of Corn Straw and Cowdung
        2.3.5 Evaluation of HRT during mesophilic process deals
    2.4 Mesophilic Process Summary
3. Co-digestion of Cowdung and Corn Straw under Thermophilic Temperature
    3.1 Introduction
    3.2 Feeding Materials and Methods
        3.2.1 Thermophilic Anaerobic Reactor
    3.3 Thermophilic Results and Discussion
        3.3.1 Performance under Thermophilic Process
        3.3.2 Evaluation of HRT during Thermophilic Process
        3.3.3 Comparing Mesophilic and Thermophilic processes
    3.4 Thermophilic Process Summary
4. Conclusion and Recommendations
    4.1 Conclusion
    4.2 Recommendation
References
Acknowledgement
Introduction of Student



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