复合硫杆菌用于污泥生物处理的工艺探究

发布时间：2018-04-05 14:01

本文选题：氧化亚铁硫杆菌　切入点：氧化硫硫杆菌　出处：《郑州大学》2015年硕士论文

【摘要】：污泥生物处理技术具有处理成本低、处理效果好、二次污染小、养分损失少等优点,在将来的城市污泥及工业污泥处理领域有广阔的应用前景。本课题以氧化硫硫杆菌和氧化亚铁硫杆菌组成的复合硫杆菌处理污泥技术为研究对象,为优化污泥处理工艺,提高污泥脱水性能和重金属去除率,实施了一批工艺优化试验。先进行了序批式摇瓶实验,探究了六个因素(菌种组成、接种量、营养剂添加量、污泥含水率、初始p H、回流比)对污泥处理效果的影响。结果表明:不同的菌种组成、接种量、营养剂加入量、污泥含水率、初始p H和污泥回流比等因素条件下,污泥的处理效果有明显差异。各因素最佳的试验条件分别为:菌种组成为硫细菌:铁细菌=4:1,复合菌种接种量为15%,营养剂加入量为10g/L,污泥含水率为98%,初始p H为6.0,污泥回流比为20%;在此基础上,设计一个放大的动态反应系统,并进行正交试验。通过正交试验方差分析,结果表明:在所选因素水平范围内,污泥含水率对试验结果影响显著(0.01p0.05),营养剂添加量对试验结果也有较大的影响(0.05p0.1),曝气量对试验结果也有一定的影响(0.5p0.1),而反应器数量对试验结果影响不大,各因素的主次顺序为污泥含水率营养剂添加量曝气量反应器数量。并得出最佳工艺条件为:污泥含水率为97.3%,曝气量为8 m3?h-1,营养剂添加量为9 g/L,反应器10个;而后选取三个不同污水处理厂的污泥进行处理试验,以验证动态反应系统在最佳工艺条件下对污泥的处理效果。结果表明:最佳工艺条件下,动态反应系统可有效地处理不同性质的污泥。处理后污泥经压滤含水率均可降低至60%以下,有机质含量下降不超过10%,重金属含量远低于农用标准限值,适合进行农用、堆肥等资源化利用。
[Abstract]:Sludge biological treatment technology has the advantages of low cost, good treatment effect, small secondary pollution, less nutrient loss and so on. It has a broad application prospect in the field of municipal sludge and industrial sludge treatment in the future.In order to optimize sludge treatment process and improve sludge dewatering performance and heavy metal removal rate, a batch of process optimization tests were carried out in this paper, which is composed of Thiobacillus thiobacillus oxide and Thiobacillus ferrooxidans.The effects of six factors (strain composition, inoculation amount, nutrient dosage, sludge moisture content, initial pH, reflux ratio) on sludge treatment were investigated.The results showed that the sludge treatment efficiency was significantly different under the conditions of different bacterial species, inoculation amount, nutrient dosage, sludge moisture content, initial pH and sludge reflux ratio.An enlarged dynamic reaction system was designed and orthogonal test was carried out.The results of orthogonal analysis of variance show that: within the level of selected factors,The effect of sludge moisture content on the test results was significant (0.01p0.05g), the amount of nutrients added had a great effect on the test results (0.05p0.1g), the aeration rate had a certain effect on the test results (0.5p0.1g), but the number of reactors had little effect on the test results.The primary and secondary order of each factor is the amount of aeration reactor with sludge moisture content nutrition agent.The optimum process conditions are as follows: water content of sludge is 97.3m ~ (-3), aeration rate is 8m ~ (-3) h ~ (-1), adding amount of nutrient is 9 g / L, reactor is 10, and sludge from three different sewage treatment plants is selected for treatment test.In order to verify the dynamic reaction system under the best process conditions for sludge treatment.The results show that the dynamic reaction system can effectively deal with different kinds of sludge under the optimum technological conditions.After treatment, the water content of sludge can be reduced to less than 60%, the content of organic matter is less than 10%, and the heavy metal content is far lower than the standard limit value of agriculture, so it is suitable for the utilization of resources such as agriculture, compost and so on.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703;X172

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