浓稀分流对猪场粪污厌氧—好氧处理系统的影响
发布时间：2018-12-15 20:56
【摘要】：畜禽养殖粪污已经成为环境污染的重要来源,其中又以猪场粪污所占比重最大,迫切需要经济、高效、可靠的处理利用技术。目前,猪场粪污处理利用主要存在两大问题,一是污水量大,升温困难,沼气发酵产气效率低。二是沼渣沼液难以完全利用,沼液好氧后处理效果差。针对上述问题,本论文在课题组前期研究的基础上,紧密围绕“浓稀分流对猪场粪污厌氧-好氧处理系统的影响”展开研究,得出以下结果:(1)在猪场粪污处理工程现场进行了固液分离生产性试验。数据测试分析表明,粪污经过固液分离后,COD、BOD5、TS、SS、TKN、TP去除10.03%、19.23%、6.90%、10.08%、14.14%、14.42%,NH3-N几乎没有去除。固液分离对浓稀分流没有明显的影响,对固液分离后的猪场粪污(固液分离液)再进行浓稀分流,仍然能取得较好的分离效果。(2)考察了浓稀分流比对浓稀分流效果的影响。结果表明,通过浓稀分流,可将猪场粪污体积与物质非均衡分配,大部分污染物和植物营养物分配到体积少的浓污水中,随着浓污水所占的比例增加,污染物在浓污水中的比例增加,相应在稀污水中的比例减少。尽管浓污水体积只占总体积的10~30%,甲烷产量却占原水甲烷产量的63.38%~76.61%。(3)考察了浓稀分流比对好氧后处理单元的影响。结果显示,浓稀比2:8体系的好氧处理效果最好,COD去除率85.4%,出水COD浓度为256 mg/L左右;氨氮去除99%以上,出水氨氮保持在5 mg/L以下;曝气结束时混合液pH值在7.0以上,处理系统运行稳定。浓稀比1:9体系效果次之。3:7体系的效果最差,COD只去除了56.9%,出水COD浓度高于946mg/L;氨氮去除95.0%左右,出水在30 mg/L以上;曝气结束时pH值在7.0以下,处理系统运行不稳定。综合考虑沼气发酵效率和好氧阶段处理效果,2:8是最合适的浓稀分流比例。(4)进一步对SBR出水进行了深度处理试验,发现絮凝处理优于氧化处理。最适絮凝剂组合为生石灰+PAM,适宜终浓度分别为800 mg/L,2 mg/L,在此条件下,絮凝处理出水COD浓度能降到83 mg/L,氨氮7.36 mg/L,TP 0.3 mg/L,色度16倍,达到《污水综合排放标准》一级标准,药剂费用为0.475元/t污水。(5)技术经济分析表明,浓稀分流工艺与Anarwia工艺对猪场粪污处理效果不相上下并显著优于传统厌氧-好氧组合工艺。同时,浓稀分离工艺显著提高了沼气发酵效率,其容积产气率比传统厌氧-好氧组合工艺和Anarwia工艺提高282%。尽管浓稀分流与Anarwia工艺对猪场粪污的处理成本接近,但是,浓稀分流工艺沼气发酵罐体积比Anarwia工艺减少72.36%,工程总投资费用节约23.27%。综上所述,基于浓稀分流的厌氧-好氧组合工艺,既能改善沼气发酵效率,又解决了沼液好氧后处理效果差的问题,相对传统厌氧-好氧组合工艺和Anarwia工艺来说,是一种更经济、高效、可靠的工艺。
[Abstract]:Livestock and poultry manure pollution has become an important source of environmental pollution, among which pig manure occupies the largest proportion, and the urgent need for economic, efficient, reliable treatment and utilization technology. At present, there are two main problems in the treatment and utilization of pig manure, one is the large amount of sewage, the difficulty of heating up, and the low efficiency of biogas fermentation. Second, the biogas residue biogas liquid is difficult to be fully utilized, and the aerobic treatment effect is poor. In view of the above problems, this paper, on the basis of the previous research by the research group, focuses on the effect of concentrated and dilute distribution on the anaerobic and aerobic treatment system of pig manure. The results are as follows: (1) A productive experiment of solid-liquid separation was carried out in the field of pig manure treatment project. Data test and analysis showed that after solid and liquid separation, COD,BOD5,TS,SS,TKN,TP removal of 10.03 and 19.23 and 6.90 and 10.08 and 14.14 and 14.42 NH _ 3-N were hardly removed. Solid-liquid separation has no obvious effect on concentrated and dilute separation, and the pig manure (solid-liquid separation) after solid-liquid separation is separated by concentrated dilute separation. A good separation effect can still be obtained. (2) the effect of the ratio of concentrated and dilute distribution on the effect of concentrated and dilute separation was investigated. The results showed that the volume and substance of pig manure could be disequilibrium distributed by concentrated and dilute distribution, and most of the pollutants and plant nutrients were distributed to the concentrated sewage with small volume, and the proportion of the concentrated sewage increased with the increase of the proportion of the concentrated sewage. The proportion of pollutants in the concentrated sewage increased, and the proportion in the dilute sewage decreased accordingly. Although the volume of concentrated sewage is only 1030% of the total volume, methane production accounts for 63.38% of the total volume of methane in raw water. (3) the effect of concentration and dilute diffluence ratio on aerobic aftertreatment unit was investigated. The results showed that the aerobic treatment effect was the best at 2:8, the removal rate of COD was 85.45.45 mg/L, the concentration of COD in effluent was about 256 mg/L, the ammonia nitrogen removal was over 99%, and the ammonia nitrogen in effluent was below 5 mg/L. At the end of aeration, the pH value of the mixed solution is above 7.0, and the treatment system is stable. The effect of 3:7 system was the worst, COD was only 56.9%, the effluent COD concentration was higher than 946 mg / L, ammonia nitrogen removal was about 95.0%, effluent water was more than 30 mg/L. At the end of aeration, the pH value is below 7. 0, and the operation of the treatment system is unstable. Considering the biogas fermentation efficiency and aerobic stage treatment effect, 2:8 is the most suitable concentration and dilute distribution ratio. (4) further advanced treatment experiment of SBR effluent was carried out, it was found that flocculation treatment was better than oxidation treatment. The optimum flocculant combination is that the optimum final concentration of lime PAM, is 800 mg/L,2 mg/L, respectively. Under this condition, the effluent COD concentration of flocculation treatment can be reduced to 83 mg/L, ammonia nitrogen 7.36 mg/L,TP 0.3 mg/L, chroma 16 times. The cost of medicament is 0.475 yuan / t sewage. (5) Technical and economic analysis shows that, The treatment of pig manure by Anarwia process and concentrated dilute separation process was comparable and superior to the traditional anaerobic aerobic combination process. At the same time, the biogas fermentation efficiency was significantly improved by the concentrated and dilute separation process, and the volumetric gas production rate was increased by 282% compared with the traditional anaerobic aerobic combination process and Anarwia process. Although the cost of treatment of pig manure by Anarwia process is close to that of Anarwia process, the volume of biogas fermenter of concentrated and dilute separation process is 72.36 less than that of Anarwia process, and the total investment cost of the project is 23.27% less than that of Anarwia process. To sum up, the anaerobic aerobic combination process based on concentrated and dilute distribution can not only improve the efficiency of biogas fermentation, but also solve the problem of poor effect of aerobic treatment of biogas liquid. Compared with the traditional anaerobic and aerobic combination process and Anarwia process, It is a more economical, efficient and reliable process.
【学位授予单位】：中国农业科学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X713
本文编号：2381277
[Abstract]:Livestock and poultry manure pollution has become an important source of environmental pollution, among which pig manure occupies the largest proportion, and the urgent need for economic, efficient, reliable treatment and utilization technology. At present, there are two main problems in the treatment and utilization of pig manure, one is the large amount of sewage, the difficulty of heating up, and the low efficiency of biogas fermentation. Second, the biogas residue biogas liquid is difficult to be fully utilized, and the aerobic treatment effect is poor. In view of the above problems, this paper, on the basis of the previous research by the research group, focuses on the effect of concentrated and dilute distribution on the anaerobic and aerobic treatment system of pig manure. The results are as follows: (1) A productive experiment of solid-liquid separation was carried out in the field of pig manure treatment project. Data test and analysis showed that after solid and liquid separation, COD,BOD5,TS,SS,TKN,TP removal of 10.03 and 19.23 and 6.90 and 10.08 and 14.14 and 14.42 NH _ 3-N were hardly removed. Solid-liquid separation has no obvious effect on concentrated and dilute separation, and the pig manure (solid-liquid separation) after solid-liquid separation is separated by concentrated dilute separation. A good separation effect can still be obtained. (2) the effect of the ratio of concentrated and dilute distribution on the effect of concentrated and dilute separation was investigated. The results showed that the volume and substance of pig manure could be disequilibrium distributed by concentrated and dilute distribution, and most of the pollutants and plant nutrients were distributed to the concentrated sewage with small volume, and the proportion of the concentrated sewage increased with the increase of the proportion of the concentrated sewage. The proportion of pollutants in the concentrated sewage increased, and the proportion in the dilute sewage decreased accordingly. Although the volume of concentrated sewage is only 1030% of the total volume, methane production accounts for 63.38% of the total volume of methane in raw water. (3) the effect of concentration and dilute diffluence ratio on aerobic aftertreatment unit was investigated. The results showed that the aerobic treatment effect was the best at 2:8, the removal rate of COD was 85.45.45 mg/L, the concentration of COD in effluent was about 256 mg/L, the ammonia nitrogen removal was over 99%, and the ammonia nitrogen in effluent was below 5 mg/L. At the end of aeration, the pH value of the mixed solution is above 7.0, and the treatment system is stable. The effect of 3:7 system was the worst, COD was only 56.9%, the effluent COD concentration was higher than 946 mg / L, ammonia nitrogen removal was about 95.0%, effluent water was more than 30 mg/L. At the end of aeration, the pH value is below 7. 0, and the operation of the treatment system is unstable. Considering the biogas fermentation efficiency and aerobic stage treatment effect, 2:8 is the most suitable concentration and dilute distribution ratio. (4) further advanced treatment experiment of SBR effluent was carried out, it was found that flocculation treatment was better than oxidation treatment. The optimum flocculant combination is that the optimum final concentration of lime PAM, is 800 mg/L,2 mg/L, respectively. Under this condition, the effluent COD concentration of flocculation treatment can be reduced to 83 mg/L, ammonia nitrogen 7.36 mg/L,TP 0.3 mg/L, chroma 16 times. The cost of medicament is 0.475 yuan / t sewage. (5) Technical and economic analysis shows that, The treatment of pig manure by Anarwia process and concentrated dilute separation process was comparable and superior to the traditional anaerobic aerobic combination process. At the same time, the biogas fermentation efficiency was significantly improved by the concentrated and dilute separation process, and the volumetric gas production rate was increased by 282% compared with the traditional anaerobic aerobic combination process and Anarwia process. Although the cost of treatment of pig manure by Anarwia process is close to that of Anarwia process, the volume of biogas fermenter of concentrated and dilute separation process is 72.36 less than that of Anarwia process, and the total investment cost of the project is 23.27% less than that of Anarwia process. To sum up, the anaerobic aerobic combination process based on concentrated and dilute distribution can not only improve the efficiency of biogas fermentation, but also solve the problem of poor effect of aerobic treatment of biogas liquid. Compared with the traditional anaerobic and aerobic combination process and Anarwia process, It is a more economical, efficient and reliable process.
【学位授予单位】：中国农业科学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X713
【参考文献】
相关期刊论文 前1条
1 葛昕;李布青;丁叶强;陈志龙;;沼液利用现状和潜在风险分析[J];安徽农业科学;2012年30期
，本文编号：2381277
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