Influences of Fe2+/Fe3+ and Mn2+ on total nitrogen removal and nitrogen transformations during low-oxygen aeration

doi:10.11949/0438-1157.20190211

Abstract

Abstract:

To quickly realize the autotrophic denitrification of actual domestic sewage in the short term, the activated sludge from the actual sewage treatment plant containing anammox bacteria was used to study the removal effect of nitrogen in the process of hypoxia aeration for Fe²⁺/Fe³⁺ and Mn²⁺. The results showed that both Fe²⁺/Fe³⁺and Mn²⁺can increase the abundance of anammox bacteria (AnAOB) in activated sludge, but Fe²⁺/Fe³⁺ had a certain inhibitory effect on ammonia oxidizing bacteria (AOB); therefore, the total inorganic nitrogen removal rate was 25% in the presence of Fe²⁺/Fe³⁺under short-term dosing, but the total inorganic nitrogen removal rate was 44% in the presence of Mn²⁺. Nitrogen balance analysis showed that nitrogen transformation was mainly denitrification under the condition of Fe²⁺/Fe³⁺; but was mainly anaerobic ammonium oxidation (anammox) process under the condition of Mn²⁺. Therefore, the anammox activity could be enhanced in traditional activated sludge by short-term addition of Mn²⁺, promoting the removal of nitrogen during the low-oxygen aeration, and facilitating the rapid achievement of integrated autotrophic nitrogen removal.

Key words: iron ion, manganese ion, conventional activated sludge, nitrogen removal, nitrogen transformation

摘要：

为短期快速实现实际生活污水自养脱氮，采用含有厌氧氨氧化菌的实际污水处理厂活性污泥，针对Fe²⁺/Fe³⁺和Mn²⁺对低氧曝气过程中氮的去除效果进行了研究，分析确定了氮素转化的途径。研究结果表明，Fe²⁺/Fe³⁺和Mn²⁺均可提高活性污泥中厌氧氨氧化菌（AnAOB）丰度，但由于Fe²⁺/Fe³⁺对氨氧化菌（AOB）也存在一定抑制作用，因此，短期投加Fe²⁺/Fe³⁺条件下，低氧曝气过程中总无机氮去除率为25%，但投加Mn²⁺条件下总无机氮去除率可达44%。通过氮素平衡分析，发现投加Fe²⁺/Fe³⁺条件下，氮素主要通过反硝化作用去除；而投加Mn²⁺条件下，氮素主要通过厌氧氨氧化（anammox）作用去除。因此，传统活性污泥可通过短期投加Mn²⁺增强厌氧氨氧化活性，促进低氧曝气过程中氮的去除，利于快速实现一体化自养脱氮。

关键词: Fe²⁺/Fe³⁺, Mn²⁺, 传统活性污泥, 氮去除, 氮素转化

CLC Number:

TQ 028.8

Jianmin LI, Qing YANG, Zhibin LIU, Runyu LIU, Bin CUI. Influences of Fe²⁺/Fe³⁺ and Mn²⁺on total nitrogen removal and nitrogen transformations during low-oxygen aeration[J]. CIESC Journal, 2019, 70(9): 3503-3510.

李健敏, 杨庆, 刘智斌, 刘润雨, 崔斌. Fe²⁺/Fe³⁺和Mn²⁺对低氧曝气过程总氮去除与转化途径的影响[J]. 化工学报, 2019, 70(9): 3503-3510.

Figures/Tables 8

Table 1 Wastewater characteristic

项目	范围	平均值
$N H 4 +$ -N/(mg/L)	44.7～99.2	65.36
$N O 2 -$ -N/(mg/L)	0～0.65	0.14
$N O 3 - - N$ /(mg/L)	0～1.14	0.25
COD/(mg/L)	95.38～269.2	151.4
TN/(mg/L)	46.2～100.7	66.86
pH	7.0～7.5	7.25

Table 1 Wastewater characteristic

项目	范围	平均值
$N H 4 +$ -N/(mg/L)	44.7～99.2	65.36
$N O 2 -$ -N/(mg/L)	0～0.65	0.14
$N O 3 - - N$ /(mg/L)	0～1.14	0.25
COD/(mg/L)	95.38～269.2	151.4
TN/(mg/L)	46.2～100.7	66.86
pH	7.0～7.5	7.25

Fig.1 Variations of N H 4 + -N, N O 2 - -N, N O 3 - -N, COD, ARR, TINRR and COD removal rate in reactor

Fig.2 Variations of N H 4 + -N, N O 3 - -N, COD, SAOR, SNPR, SODR and iron ion

Fig.3 Variations of N H 4 + -N, N O 2 - -N, N O 3 - -N, COD, ARR and TINRR in the presence of iron ion

Fig.4 Variations of N H 4 + -N, N O 3 - -N, COD, SAOR, SNPR, SODR and manganese ion

Fig.5 Variations of N H 4 + -N, N O 2 - -N, N O 3 - -N, COD, ARR and TINRR in the presence of manganese ion

Table 2 Crucial parameters of reactor in the presence of separate iron and manganese ion

金属离子	MLSS/(mg/L)	SVI/(ml/g)	SAOR/(mg N/(g MLSS·h))	SNPR/(mg N/(g MLSS·h))	ARR/%	TINRR/%
Fe²⁺	3758.5	64	1.71±0.27	1.63±0.22	73.53±4.1	27.53±4.29
Fe³⁺	3735.5	59	1.66±0.24	1.59±0.24	67.86±6.71	23.46±5.67
Mn²⁺	3692.5	65	2.41±0.22	1.64±0.11	90.71±3.61	44.2±1.04

Fig.6 Variations of microorganisms abundance in the presence of separate iron and manganese ion

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Influences of Fe²⁺/Fe³⁺ and Mn²⁺on total nitrogen removal and nitrogen transformations during low-oxygen aeration

Fe²⁺/Fe³⁺和Mn²⁺对低氧曝气过程总氮去除与转化途径的影响

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