餐厨发酵液强化喹啉降解和反硝化脱氮

doi:10.19965/j.cnki.iwt.2020-0941

摘要/Abstract

摘要：

工业废水中的喹啉类化合物会严重抑制反硝化细菌的活性，阻碍废水生物脱氮过程。将餐厨发酵液作为碳源，应用于喹啉降解和反硝化脱氮过程。设置乙酸钠（A）和餐厨发酵液（B）两组反应器，在喹啉质量浓度为200 mg/L、COD/NO₃^--N为7的条件下，A、B两组的出水中未检测出喹啉，COD去除率分别为83.2%±0.4%和87.6%±1.1%，TN去除率分别为90.9%±3.5%和95.8%±1.5%。餐厨发酵液会促进污泥中Trichococcus菌丰度增加，加速喹啉降解，提升系统的脱氮效率。同时，餐厨发酵液会增大污泥粒径，提高污泥沉降性，增加污泥微生物多样性，提升系统运行的稳定性。

关键词: 喹啉, 餐厨垃圾, 反硝化, 污泥, 协同作用

Abstract:

In the treatment of industrial wastewater, the quinoline compounds could severely inhibit the denitrifying bacteria in the activated sludge process and hinder the biological denitrification process of wastewater. In this study, the fermentation liquid from food waste was used as carbon source and employed to the denitrification process of quinoline-containing wastewater. Two sets of reactors with sodium acetate(A) and fermentation liquid from food waste(B) were operated. When the concentration of quinoline was 200 mg/L and the COD/Nitrate-N(NO₃^--N) was 7, no quinoline was detected in the effluent. The COD removal rates of Group A and Group B were 83.2%±0.4% and 87.6%±1.1%. And the TN removal rates of Group A and B were 90.9%±3.5% and 95.8%±1.5%, respectively. Fermentation liquid from food waste could promote the enrichment of Trichococcus bacteria, accelerate the degradation of quinoline, and promote the nitrogen removal efficiency. Meanwhile, the fermentation liquid from food waste would promote the formation of sludge flocs, improve the sludge settlement, enrich species diversity, and enhance the stability of the system.

Key words: quinoline, food waste, denitrification, sludge, synergistic effect

中图分类号:

X703

林惟实,何春华,王传亚,郑晓浩,胡真虎,王伟. 餐厨发酵液强化喹啉降解和反硝化脱氮[J]. 工业水处理, 2021, 41(7): 94-99.

Weishi Lin,Chunhua He,Chuanya Wang,Xiaohao Zheng,Zhenhu Hu,Wei Wang. Enhancement of quinoline degradation and denitrification nitrogen removal by using fermentation liquid from food waste[J]. Industrial Water Treatment, 2021, 41(7): 94-99.

https://www.iwt.cn/CN/Y2021/V41/I7/94

图/表 7

图1 UASB反应器示意

Fig.1 Schematic diagram of UASB reactor

表1 不同阶段的进水设置

Table 1 Influent compositions at different stages

阶段	喹啉/（mg·L^-1）	补充碳源COD/（mg·L^-1）	总COD/（mg·L^-1）
阶段一（第1天—第43天）	50	600	700
阶段二（第44天—第56天）	100	450	700
阶段三（第57天—第63天）	200	200	700

图2 反应器出水NO₂^--N、NO₃^--N和TN浓度变化

Fig.2 Changes of the concentrations of NO₂^--N, NO₃^--N and TN in the effluent of reactors

图3 反应器出水COD变化

Fig.3 Changes of the concentrations of COD in the effluent of reactors

图4 污泥反硝化活性实验

Fig.4 Experiment on denitrification activity of sludge

图5 污泥EPS和SMP中的多糖、蛋白含量变化

Fig.5 Changes of polysaccharide and protein contents in EPS and SMP of sludge

表2 污泥菌群主要菌属及相对丰

Table 2 Main genera and relative abundance of sludge microflora

类别	Bacteroidetes	Denitratisom	Trichococcus	Longilinea	Rhodococcus
A（乙酸钠组）	11.6%	7.4%	1.7%	4.0%	2.4%
B（餐厨发酵液）	6.5%	7.7%	6.5%	3.0%	2.3%

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