论文总字数：21253字

摘 要

近几年，木薯酒精产业发展迅速，但随之产生的木薯酒精废水问题仍需解决。厌氧发酵技术是一种常用的酒精废水处理技术，其在处理酒精废水的同时还产生沼气，沼气中含有1~12g/m³硫化氢，作为车用燃料，硫化氢的浓度需小于等于15 mg/m³。本文拟在厌氧固定床反应器高效处理木薯酒精废水的基础上，研究了含铁化合物原位脱硫和喜温嗜酸硫杆菌生物脱硫的过程，并将两者联合比较硫化氢含量的变化。实验结果表明：含铁化合物和喜温嗜酸硫杆菌联合脱硫的效果优于单独脱硫效果。向厌氧反应系统中投加4 mM的FeCl₂、FeCl₃和Fe(OH)₃，硫化氢脱除率分别可达91.84%、91.18%和85.04%。利用喜温嗜酸硫杆菌生物脱硫，其脱硫率可达95.19%。而分别投加4 mM FeCl₂、FeCl₃、Fe(OH)₃和喜温嗜酸硫杆菌株进行联合脱硫，硫化氢脱除率分别高达99.62%、99.71%和99.64%，脱硫效果均有所提升。加入FeCl₂: FeCl₃: Fe(OH)₃=3:1:1混合的含铁化合物，沼气中硫化氢的浓度降至最低41.43 ppm，脱硫率达92.19%，而当FeCl₂、FeCl₃、Fe(OH)₃按3:1:1混合与喜温嗜酸硫杆菌进行联合脱硫时效果最好，脱硫率高达99.90%。此外，原位脱硫剂含铁化合物的添加并没有对甲烷产量产生影响，说明Fe(OH)₃、FeCl₂和FeCl₃对产甲烷菌的活性没有明显抑制作用。

关键词：硫化氢 喜温嗜酸硫杆菌 含铁化合物 木薯酒精废水

Abstract

In recent years, cassava alcohol industry has developed rapidly, but the resulting cassava alcohol wastewater problem still needs to be resolved. Anaerobic fermentation technology is a commom technoogy used to treat alcohol wastewater,which produces biogas at the same time.biogas contains 1-12g/m³ hydrogen sulfide. as vehicle fuel, hydrogen sulfide concentration of less than or equal to 15mg/m³. In this paper, we studied the process of in situ desulfurization of iron-containing compounds and bio-desulfurization of Acidithiobacillus caldus,combine them and compare the change of hydrogen sulfide content.The experiment was based on the treatment of cassava alcohol wastewater with an anaerobic fixed bed reactor.The results showed that the combined desulfurization efficiency of iron containing compounds and Acidithiobacillus caldus was better than that of single desulfurization..4 mM of FeCl₂, FeCl₃ and Fe(OH)₃ were added to the anaerobic reaction system, and the removal rate of hydrogen sulfide was 91.84%, 91.18% and 85.04%, respectively.When we use Acidithiobacillus caldus for biological desulfurization,the desulfurization rate was 95.19%.The desulfurization rate of hydrogen sulfide was 99.62%, 99.71% and 99.64% when 4mM of FeCl₂, FeCl₃, and Fe(OH)₃ and Acidithiobacillus caldus were combined to remove hydrogen sulfide from biogas, respectively,Desulfurization effect has improved.Adding FeCl₂:FeCl₃:Fe(OH)₃=3:1:1 mixed iron containing compounds, the concentration of hydrogen sulfide in biogas was reduced to 41.43 ppm, and the desulfurization rate was 92.19%,the combined desulfurization efficiency of Acidithiobacillus caldus and iron containing compounds which FeCl₂, FeCl₃, Fe(OH)₃ were mixed at 3: 1: 1 was the best,the desulfurization rate was up to 99.90%.In addition, the addition of iron compounds in situ desulfurizer did not affect the methane production, indicating that Fe(OH)₃, FeCl₂ and FeCl₃ did not significantly inhibit the activity of methanogens.

Key words: Hydrogen sulfide;Acidithiobacillus caldus;Iron compounds;Cassava Alcohol Wastewater

目 录

摘 要 I

ABSTRACT II

第一章 文 献 综 述 1

1.1 环境与能源 1

1.2 沼气的发酵过程及控制条件 1

1.2.1 厌氧发酵技术 1

1.2.2 沼气生产的控制条件 2

1.3 硫化氢去除的方法 3

1.3.1 干法脱硫 3

1.3.2 湿法脱硫 3

1.3.3生物脱硫 4

1.3.4原位脱硫 4

1.4 研究目的和意义 4

第二章 实验器材和方法 5

2.1实验仪器及试剂 5

2.2实验装置 7

2.3 实验方法 7

2.3.1喜温嗜酸硫杆菌菌株的培养方法 7

2.3.2 硫化氢标准曲线测定 8

2.3.3硫化氢含量的测定 9

2.4 实验内容 9

2.4.1喜温嗜酸硫杆菌去除沼气中硫化氢 9

2.4.2 不同浓度的FeCl₂和喜温嗜酸硫杆菌株联合去除沼气中硫化氢 10

2.4.3 不同浓度的FeCl₃和喜温嗜酸硫杆菌株联合去除沼气中硫化氢 10

2.4.4 不同浓度的Fe(OH)₃和喜温嗜酸硫杆菌株联合去除沼气中硫化氢 11

2.4.5 Fe(OH)₃、FeCl₂和FeCl₃按照不同比例混合和喜温嗜酸硫杆菌株联合去除沼气中硫化氢 11

第三章 结果与讨论 13

3.1含铁化合物原位脱除沼气中硫化氢 13

3.2 喜温嗜酸硫杆菌去除沼气中硫化氢 16

3.3 含铁化合物原位脱硫和喜温嗜酸硫杆菌生物脱硫联合去除沼气中硫化氢 17

3.4 含铁化合物对沼气产量的影响 21

第四章 结论与展望 23

4.1 结论 23

4.2 展望 23

参考文献 24

致 谢 26

第一章 文 献 综 述

1.1 环境与能源

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