鸟粪石循环利用处理高氨氮废水的热解行为

曾庆玲; 王露; 沈春花; 李飞

环境工程学报

鸟粪石循环利用处理高氨氮废水的热解行为

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曾庆玲, 王露, 沈春花, 李飞. 鸟粪石循环利用处理高氨氮废水的热解行为[J]. 环境工程学报, 2013, 7(7): 2541-2546.

引用本文:

曾庆玲, 王露, 沈春花, 李飞. 鸟粪石循环利用处理高氨氮废水的热解行为[J]. 环境工程学报, 2013, 7(7): 2541-2546.

Zeng Qingling, Wang Lu, Shen Chunhua, Li Fei. Thermal decomposition behavior of struvite in recycling treatment of high ammonia-nitrogen wastewater[J]. Chinese Journal of Environmental Engineering, 2013, 7(7): 2541-2546.

Citation:

Zeng Qingling, Wang Lu, Shen Chunhua, Li Fei. Thermal decomposition behavior of struvite in recycling treatment of high ammonia-nitrogen wastewater[J]. Chinese Journal of Environmental Engineering, 2013, 7(7): 2541-2546.

鸟粪石循环利用处理高氨氮废水的热解行为

1.
华侨大学土木工程学院, 厦门 361021
基金项目:
国家自然科学基金资助项目(51208215,51108197)

福建省自然科学基金资助项目(2011J01318,2011J05135)
中图分类号: X703

Thermal decomposition behavior of struvite in recycling treatment of high ammonia-nitrogen wastewater

1.
College of Civil Engineering, Huaqiao University, Xiamen 361021, China
Fund Project:

摘要: 为了循环利用鸟粪石处理高氨氮废水,探讨了鸟粪石煅烧与加碱热解的脱氮率,利用电镜扫描(SEM)和X射线衍射(XRD)对2种热解产物进行了分析。鸟粪石煅烧条件为:温度100~225℃,时间1~5 h;加碱热解条件为:温度60~95℃,时间0.5~4 h,加碱量OH-:NH4+摩尔比值0.4~1.5。结果表明,虽然XRD分析显示2种热解产物都已失去鸟粪石的特征峰,但是鸟粪石加碱热解效果更好,最佳热解条件为:加碱量OH-:NH4+摩尔比值1,温度90℃,时间2 h,鸟粪石脱氮率95%以上;加碱热解产物表面为多孔状,完全失去了晶体结构;煅烧热解鸟粪石脱氮率仅为80%左右,热解产物晶体结构破坏不完全。鸟粪石在最佳条件下热解循环处理高氨氮废水,可循环使用6次,氨氮去除率80%以上,出水磷浓度小于8 mg/L。
- 鸟粪石 /
- 热解 /
- 脱氮率 /
- 电镜扫描 /
- X射线衍射
Abstract: In order to treat high ammonia-nitrogen wastewater by struvite reuse, the thermal decomposition of struvite was studied. The denitrification rates of struvite were studied by calcination and heat under alkali conditions separately. The thermal decomposition residues were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). The temperature for struvite calcination was between 100~225℃; calcination time ranged from 1~5 hours. When the struvite was heated under alkali conditions, the temperature was between 60~95℃; the molar ratio of OH-:NH4+ was 0.4~1.5; and heated time was 0.5~4 hours. Analysis with XRD showed that the characteristic peaks of struvite were absent in both the two kinds of thermal decomposition residues, but the alkali method was better. The denitrification rate of struvite could reach 95% under alkali conditions, when OH-:NH4+ molar ratio was 1, temperature was 90℃ and being heated for 2 hours. SEM analysis showed that the thermal decomposition residues was porous surface and lost crystal structure completely under alkali conditions, but the crystal structure was not destroyed completely when struvite was calcined with a denitrification rate of 80% only. The struvite could be reused for six times for the high ammonia-nitrogen wastewater treatment under best condition, with a removal rate of ammonia-nitrogen over 80%, and the concentration of phosphate was lower than 8 mg/L.
- struvite /
- thermal decomposition /
- denitrification rate /
- SEM /
- XRD

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曾庆玲, 王露, 沈春花, 李飞. 鸟粪石循环利用处理高氨氮废水的热解行为[J]. 环境工程学报, 2013, 7(7): 2541-2546.

引用本文:

曾庆玲, 王露, 沈春花, 李飞. 鸟粪石循环利用处理高氨氮废水的热解行为[J]. 环境工程学报, 2013, 7(7): 2541-2546.

Citation:

鸟粪石循环利用处理高氨氮废水的热解行为

1. 华侨大学土木工程学院, 厦门 361021

收稿日期: 2012-01-16

基金项目:

国家自然科学基金资助项目(51208215,51108197)

福建省自然科学基金资助项目(2011J01318,2011J05135)

关键词:

摘要: 为了循环利用鸟粪石处理高氨氮废水,探讨了鸟粪石煅烧与加碱热解的脱氮率,利用电镜扫描(SEM)和X射线衍射(XRD)对2种热解产物进行了分析。鸟粪石煅烧条件为:温度100~225℃,时间1~5 h;加碱热解条件为:温度60~95℃,时间0.5~4 h,加碱量OH-:NH4+摩尔比值0.4~1.5。结果表明,虽然XRD分析显示2种热解产物都已失去鸟粪石的特征峰,但是鸟粪石加碱热解效果更好,最佳热解条件为:加碱量OH-:NH4+摩尔比值1,温度90℃,时间2 h,鸟粪石脱氮率95%以上;加碱热解产物表面为多孔状,完全失去了晶体结构;煅烧热解鸟粪石脱氮率仅为80%左右,热解产物晶体结构破坏不完全。鸟粪石在最佳条件下热解循环处理高氨氮废水,可循环使用6次,氨氮去除率80%以上,出水磷浓度小于8 mg/L。

English Abstract

Thermal decomposition behavior of struvite in recycling treatment of high ammonia-nitrogen wastewater

1. College of Civil Engineering, Huaqiao University, Xiamen 361021, China

Received Date: 2012-01-16

Fund Project:

Keywords:

Abstract: In order to treat high ammonia-nitrogen wastewater by struvite reuse, the thermal decomposition of struvite was studied. The denitrification rates of struvite were studied by calcination and heat under alkali conditions separately. The thermal decomposition residues were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). The temperature for struvite calcination was between 100~225℃; calcination time ranged from 1~5 hours. When the struvite was heated under alkali conditions, the temperature was between 60~95℃; the molar ratio of OH-:NH4+ was 0.4~1.5; and heated time was 0.5~4 hours. Analysis with XRD showed that the characteristic peaks of struvite were absent in both the two kinds of thermal decomposition residues, but the alkali method was better. The denitrification rate of struvite could reach 95% under alkali conditions, when OH-:NH4+ molar ratio was 1, temperature was 90℃ and being heated for 2 hours. SEM analysis showed that the thermal decomposition residues was porous surface and lost crystal structure completely under alkali conditions, but the crystal structure was not destroyed completely when struvite was calcined with a denitrification rate of 80% only. The struvite could be reused for six times for the high ammonia-nitrogen wastewater treatment under best condition, with a removal rate of ammonia-nitrogen over 80%, and the concentration of phosphate was lower than 8 mg/L.

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鸟粪石循环利用处理高氨氮废水的热解行为

Thermal decomposition behavior of struvite in recycling treatment of high ammonia-nitrogen wastewater

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鸟粪石循环利用处理高氨氮废水的热解行为

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Thermal decomposition behavior of struvite in recycling treatment of high ammonia-nitrogen wastewater

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