| 鸟粪石结晶法处理牛场沼液过程中磷形态转化 |
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| 引用本文： | 李洪刚,陈玉成,肖广全,黄 磊,杨志敏.鸟粪石结晶法处理牛场沼液过程中磷形态转化[J].农业工程学报,2016,32(3):228-233. |
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| 作者姓名： | 李洪刚 陈玉成 肖广全 黄 磊 杨志敏 |
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| 作者单位： | 1. 西南大学资源环境学院,重庆,400716;2. 西南大学资源环境学院，重庆 400716; 重庆市农业资源与环境研究重点实验室，重庆 400716 |
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| 基金项目： | 国家科技支撑计划项目（2010BAD03B03）和重庆市环境保护科技项目（2013CF-301）联合资助 |
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| 摘 要： | 为了解鸟粪石结晶法处理牛场沼液过程中不同形态磷的转化规律,该文以奶牛场沼液为对象,进行鸟粪石(Mg NH4PO4·6H2O,MAP)结晶法除磷过程中磷形态转化的试验研究。将原沼液和在不同p H值(8.5、9.0、9.5)下经MAP沉淀法处理后的沼液离心分离成固液两部分,分别测定两相中不同形态磷含量。在明确原沼液中磷形态及含量的基础上分析鸟粪石结晶法处理沼液后分离的固相和液相中不同形态磷的含量变化,确定牛场沼液中参与鸟粪石结晶反应的主要磷形态及比例。试验表明,牛场沼液中参与鸟粪石结晶反应的主要为溶解性正磷酸盐(Ortho-P)和铁铝结合磷(Fe-P/Al-P),两者占沼液总磷(total phosphorus,TP)的29.39%。p H值=9.5时,沼液中磷发生鸟粪石结晶反应程度较高,此时(Ortho-P+Na OH-P)去除率为80.84%,其中91.28%转化成鸟粪石,沉淀物中鸟粪石的质量分数达到10.96%。该研究明确了鸟粪石结晶法处理沼液过程中不同形态磷的转化规律,为优化反应条件促使沼液中磷向鸟粪石转移提供了依据。
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| 关 键 词： | 磷 结晶 水污染控制 奶牛场沼液 鸟粪石 形态转化 |
| 收稿时间： | 2015/7/19 0:00:00 |
| 修稿时间： | 2015/11/23 0:00:00 |
Phosphorous transformation during cattle farm biogas slurry treatment using struvite crystallization |
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| Li Honggang,Chen Yucheng,Xiao Guangquan,Huang Lei and Yang Zhimin.Phosphorous transformation during cattle farm biogas slurry treatment using struvite crystallization[J].Transactions of the Chinese Society of Agricultural Engineering,2016,32(3):228-233. |
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| Authors: | Li Honggang Chen Yucheng Xiao Guangquan Huang Lei and Yang Zhimin |
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| Institution: | 1. College of Resources and Environment, Southwest University, Chongqing 400716, China;,1. College of Resources and Environment, Southwest University, Chongqing 400716, China; 2. Chongqing Key Lab of Agricultural Resources & Environment, Chongqing 400716, China;,1. College of Resources and Environment, Southwest University, Chongqing 400716, China; 2. Chongqing Key Lab of Agricultural Resources & Environment, Chongqing 400716, China;,1. College of Resources and Environment, Southwest University, Chongqing 400716, China; and 1. College of Resources and Environment, Southwest University, Chongqing 400716, China; 2. Chongqing Key Lab of Agricultural Resources & Environment, Chongqing 400716, China; |
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| Abstract: | Struvite (or MAP) crystallization is a promising method for removing and recovering phosphorus from wastewater such as biogas slurry which is a wastewater high in phosphorus content. In this research, we analyzed different forms of phosphorus in cattle farm biogas slurry and phosphorous transformation in cattle farm biogas slurry during struvite crystallization. The transformation processes under pH value of 8.5, 9.0 and 9.5 were respectively observed based on measurement of the P content in liquid and solid phases which was mainly magnesium ammonium phosphate (MAP) obtained by centrifugation. Struvite was determined by the following steps: 1) The solid was recovered by centrifugation after the crystallization; 2) It was then washed and dried repeatedly; 3) It was dissolved by 1 mol/Lof HCl; 4) The ammonium was detected; 5) The amount of struvite was calculated based on each MgNH4PO3·6H2O molecule which contained one ammonium molecule only. Phosphorus of liquid phase was classified into particulate phosphorus (PP), ortho phosphate (Ortho-P) and reductive dissolved phosphorus (RDP). In other phases, it was classified into phosphorus extracted by deionized water (H2O), NaHCO3, NaOH and HCl, respectively. Among them, H2O-P and NaHCO3-P was regarded as soluble phosphorus, while NaOH-P was regarded as a phosphorus compound which was combined with iron & aluminum (Fe-P/Al-P) and HCl-P was regarded as a phosphorus compound which was combined with calcium & magnesium (Ca-P/Mg-P). Before struvite crystallization, total phosphorus of (56.21±0.75) mg/L in liquid phase existed in the form of PP, Ortho-P and RDP with contents of 41.01%, 53.69% and 5.30%, respectively. Meanwhile, 5.69%, 25.45%, 12.32% and 32.16% of total phosphorus of (79.97±1.84) mg/Lin solid phase was extracted successively by deionized water, 0.5 mol/LNaHCO3, 0.1 mol/LNaOH and 1.0 mol/L HCl, respectively, while the remained 24.38% was residual phosphorus (Re-P). During the struvite crystallization at about pH value 8.5, 9.0, and 9.5, the content of Ortho-P of (30.18±0.37) mg/Lin liquid phase decreased to (17.98±0.30), (11.43±0.73) and (6.23±1.32) mg/L, respectively. The content of NaOH-P of (9.85±0.18) mg/L in solid phase decreased to (1.47±0.11), (1.29±0.07)and (1.44±0.27) mg/L,respectively. Meanwhile, the content of HCl-P in solid phase increased significantly (P<0.05). In most cases, the fraction of other forms of phosphorus such as PP and RDP in liquid phase and H2O-P, NaHCO3-P and Re-P in solid phase did not vary significantly (P>0.05). According to the experiment, we can speculate that Ortho-P and NaOH-P (Fe-P/Al-P) were transformed into struvite and the other forms. Ortho-P and NaOH-P occupying 29.39% of biogas slurry phosphorus made greatest contribution to struvite formation among all forms, and 80.84% of them were removed from cattle farm biogas slurry, of which 91.28% of them were the struvite formed at about pH 9.5. After the crystallization, 10.96% (mass proportion) of the precipitation could be regarded as struvite at about pH 9.5, and the proportions were 6.97% and 9.25% at about pH 8.5 and pH 9.0, respectively. Thus, pH 9.5 was regarded as the proper pH for struvite crystallization among the values pH value 8.5, 9.0 and 9.5. In this paper, we clarified the transformation of different forms of phosphorus in cattle farm biogas slurry. In this way, it can be used as a reference for struvite crystallization condition optimization in the future. |
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| Keywords: | phosphorus crystallization water pollution control cattle farm biogas slurry struvite form transformation |
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