| 猪粪沼液的磁混凝预处理工艺优化及评估 |
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| 引用本文： | 罗国华, 张春, 郑利兵, 魏源送, 郁达伟. 猪粪沼液的磁混凝预处理工艺优化及评估[J]. 环境工程学报, 2019, 13(2): 414-423. doi: 10.12030/j.cjee.201807200 |
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| 作者姓名： | 罗国华 张春 郑利兵 魏源送 郁达伟 |
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| 作者单位： | 1.北京石油化工学院化学工程学院，北京 102617; 2.中国科学院生态环境研究中心，环境模拟与污染控制国家重点联合实验室，北京 100085; 3.中国科学院生态环境研究中心，水污染控制实验室，北京 100085; 4.北京化工大学化学工程学院，北京 100029; 5.江西省科学院能源所，南昌 330096 |
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| 基金项目： | 国家重点研发计划;国家自然科学基金;江西省科技计划 |
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| 摘 要： | 以高悬浮物、高氮磷与高有机物的猪粪沼液为研究对象，采用磁混凝进行预处理，以浊度去除率为主要考察指标，结合单因素实验和正交实验，优化磁混凝工艺参数，并简要分析磁混凝机制及评估其作为沼液资源化利用的预处理工艺的效能。研究结果表明，优化的磁混凝条件是PAC 、PAM、磁种的投加量分别为5 g·L-1、120 mg·L-1、3 g·L-1，转速为250 r·min-1。经磁混凝处理后，猪粪沼液的浊度、SS、COD、TP与PO43--P浓度降为2 235 NTU、3.84 g·L-1、10 302 mg·L-1、133 mg·L-1和62.58 mg·L-1，去除率分别为92.90%、84.42%、70.63%、91.90%和50.3%。同时，磁混凝对氨氮与K的去除率较低，分别为6.49%和16.12%，浓度分别为4 072.5 mg·L-1和4 176 mg·L-1，利于后续的沼液资源化利用。磁种加载后在混凝过程中被絮体包裹，形成密实的磁絮体，显著提高了沉降性能，沉降时间由传统混凝的25 min降为5 min，同时污泥量显著减少。综上，磁混凝可高效削减沼液的悬浮物，且保留氮与钾等营养物质，促进沼液资源化利用。
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| 关 键 词： | 沼液资源化利用 固液分离 磁混凝 磁絮体 猪粪沼液 |
Optimization and evaluation of magnetic coagulation process pretreating swine manure biogas slurry |
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| LUO Guohua, ZHANG Chun, ZHENG Libing, WEI Yuansong, YU Dawei. Optimization and evaluation of magnetic coagulation process pretreating swine manure biogas slurry[J]. Chinese Journal of Environmental Engineering, 2019, 13(2): 414-423. doi: 10.12030/j.cjee.201807200 |
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| Authors: | LUO Guohua ZHANG Chun ZHENG Libing WEI Yuansong YU Dawei |
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| Affiliation: | 1.College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China; 2.State Key Joint of Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 3.Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 4.College of Chenical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; 5.Institute of Energy, Jiangxi Academy of Sciences, Nanchang 330096, China |
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| Abstract: | Swine manure biogas slurry with high strength of suspend solids, nitrogen, phosphorous and organic matter was pretreated by magnetic coagulation. The operational parameters of magnetic coagulation were optimized through the combination of single factor and orthogonal tests when turbidity removal rate was taken as the main indicator. Then the magnetic coagulation mechanism was analyzed and its performance as a pretreatment process of biogas slurry resource utilization was also evaluated. Results showed that optimal magnetic coagulation parameters were as follows: 5 g·L-1 PAC, 120 mg·L-1 PAM, 3 g·L-1 magnetic seed and 250 r·min-1 rotation speed. After the magnetic coagulation pretreatment, turbidity and the concentrations of suspend solids (SS), chemical oxygen demand (COD)，total phosphorous (TP) and phosphate (PO43--P) were 2 235 NTU, 3.84 g·L-1, 10 302 mg·L-1, 133 mg·L-1 and 78 mg·L-1, and their removal rates were 92.90%, 84.42%, 70.63%, 91.90% and 50.3%, respectively. Meanwhile, the removal rates of ammonia nitrogen (NH4+-N) and potassium (K) by magnetic coagulation were as low as 6.49% and 16.12%, and the residual concentrations were 4 072.5 mg·L-1 and 4 176 mg·L-1, respectively, which indicated that magnetic coagulation could recover nitrogen and potassium from swine manure biogas slurry and was beneficial for the subsequent biogas slurry resource utilization. In the magnetic coagulation, the dosed magnetic seed could be wrapped and compact flocs appeared, their settleability was significantly improved, the settling time decreased from 25 min to 5 min accordingly. Thus, magnetic coagulation not only effectively reduced the suspend solids of swine manure biogas slurry, but also retained nutrients such as nitrogen and potassium, which will benefit the biogas slurry resource utilization. |
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| Keywords: | digestate resource utilization solid-liquid separation magnetic coagulation magnetic floc swine manure digestate |
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