Main reactions in denitrification system with zero valent iron addition

doi:10.11894/iwt.2020-0411

Abstract

Abstract:

The systems of the zero valent iron, the denitrification sludge and the zero valent iron plus denitrification sludge were used to treat the wastewater containing nitrate nitrogen. The influence of zero valent iron addition on the denitrification effect of anoxic denitrification system and the main reactions occurred in the system were discussed. The results showed that zero valent iron system had no removal effect on nitrate nitrogen in wastewater. When the removal rate of nitrate nitrogen in wastewater by zero valent iron plus denitrification sludge system reached 100%, the removal rate of nitrate nitrogen in wastewater by denitrification sludge system was only 60.1%. The oxidation-reduction reaction with zero valent iron and the biological denitrification reaction with microorganism mainly occurred in the system of zero valent iron plus denitrification sludge.

Key words: zero valent iron, denitrification sludge, wastewater treatment

摘要：

分别采用零价铁、反硝化污泥及零价铁+反硝化污泥的系统处理含NO₃^--N的废水，探讨零价铁的添加对反硝化系统脱氮效果的影响及系统中发生的主要反应。结果表明，零价铁系统对废水中的NO₃^--N无去除效果；当零价铁+反硝化污泥系统对废水中NO₃^--N的去除率达到100%时，反硝化污泥系统对废水中的NO₃^--N去除率仅为60.1%。零价铁+反硝化污泥系统中主要发生零价铁参与的氧化还原反应及微生物参与的生物反硝化反应。

关键词: 零价铁, 反硝化污泥, 废水处理

CLC Number:

X703

Yan Yang,Jingping Zhu. Main reactions in denitrification system with zero valent iron addition[J]. Industrial Water Treatment, 2021, 41(3): 77-82.

杨燕,朱静平. 添加零价铁的反硝化系统中发生的主要反应[J]. 工业水处理, 2021, 41(3): 77-82.

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URL: https://www.iwt.cn/EN/10.11894/iwt.2020-0411

https://www.iwt.cn/EN/Y2021/V41/I3/77

Figures/Tables 6

References 15

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反应器	NO₃^--N	NO₂^--N	NH₄⁺-N	COD
1^#	48.42	0.61	0.61	290.63
2^#	49.51	0.15	0.35	260.63
3^#	44.94	0.80	2.57	293.45

反应器	NO₃^--N	NO₂^--N	NH₄⁺-N	COD
1^#	48.42	0.61	0.61	290.63
2^#	49.51	0.15	0.35	260.63
3^#	44.94	0.80	2.57	293.45

反应器	NO₃^--N	NO₂^--N	NH₄⁺-N	TN	COD	主要反应
1^#	无去除效果	无明显变化	无明显变化	无明显变化，含量约为三氮之和	无明显变化	—
2^#	去除率低	先增后降，存在极大值3.47 mg	下降速率较快	逐渐降低，含量约为三氮之和	下降速率较快	8NO₃^-+5CH₃COONa→10CO₂+4N₂+H₂O+13OH^-+5Na⁺ 4NO₃^-+CH₃COONa→2CO₂+4NO₂^-+H₂O+Na⁺+OH^- 8NO₂^-+3CH₃COONa⁺H⁺→6CO₂+4N₂+3Na⁺+10OH^-
3^#	去除率高、去除速度快	先增后降，存在极大值9.95 mg	增加	先降低后稳定，含量约为三氮之和	下降速率较慢	8NO₃^-+5CH₃COONa→10CO₂+4N₂+H₂O+13OH^-+5Na⁺ 4NO₃^-+CH₃COONa→2CO₂+4NO₂^-+ H₂O+Na⁺+OH^- 8NO₂^-+3CH₃COONa⁺H⁺→6CO₂+4N₂+3Na⁺+10OH^- 4Fe+NO₃^-+7H₂O→4Fe₂⁺+NH₄⁺+10OH^- Fe+NO₃^-+H₂O→Fe₂⁺+NO₂^-+2OH^- 3Fe+NO₂^-+8H⁺→3Fe₂⁺+NH₄⁺+2H₂O

反应器	NO₃^--N	NO₂^--N	NH₄⁺-N	TN	COD	主要反应
1^#	无去除效果	无明显变化	无明显变化	无明显变化，含量约为三氮之和	无明显变化	—
2^#	去除率低	先增后降，存在极大值3.47 mg	下降速率较快	逐渐降低，含量约为三氮之和	下降速率较快	8NO₃^-+5CH₃COONa→10CO₂+4N₂+H₂O+13OH^-+5Na⁺ 4NO₃^-+CH₃COONa→2CO₂+4NO₂^-+H₂O+Na⁺+OH^- 8NO₂^-+3CH₃COONa⁺H⁺→6CO₂+4N₂+3Na⁺+10OH^-
3^#	去除率高、去除速度快	先增后降，存在极大值9.95 mg	增加	先降低后稳定，含量约为三氮之和	下降速率较慢	8NO₃^-+5CH₃COONa→10CO₂+4N₂+H₂O+13OH^-+5Na⁺ 4NO₃^-+CH₃COONa→2CO₂+4NO₂^-+ H₂O+Na⁺+OH^- 8NO₂^-+3CH₃COONa⁺H⁺→6CO₂+4N₂+3Na⁺+10OH^- 4Fe+NO₃^-+7H₂O→4Fe₂⁺+NH₄⁺+10OH^- Fe+NO₃^-+H₂O→Fe₂⁺+NO₂^-+2OH^- 3Fe+NO₂^-+8H⁺→3Fe₂⁺+NH₄⁺+2H₂O

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