Study on the formation of aerobic granular sludge induced by Ni2+ and the removal of nitrogen and phosphorus in the treatment of high salinity wastewater

doi:10.19965/j.cnki.iwt.2023-0844

Abstract

Abstract:

The soil surface in the southern Xinjiang region has a high salt content, and flooding water causes salt dissolution and pollutes surface water. Therefore, it is particularly important to study the technology of nitrogen and phosphorus removal in the degradation of high salt wastewater. Activated sludge was inoculated in an SBR system with a height to diameter ratio (R _H/D) of 7.5, and synthetic wastewater (containing 0.25 mg/L Ni²⁺) was used as influent to analyze the changes in sludge morphology, pollutant removal performance, microbial community during the sludge granulation process, as well as the ability of granular sludge to remove pollutants from high salt wastewater under salinity stress. The results showed that the mature granular sludge was yellow in multiple forms, with an average particle size of 357 μm. The average removal rates of COD, TP, and NH₄ ⁺-N in wastewater were 95%,91.27%,and 94.5%, respectively. The dominant bacterial genera were Zoogloea, Flavobacterium,and Unclassified_f_Comamonadaceae. The influent water quality would change the relative abundance of microorganisms, while there was no significant impact on the microbial community structure. When the salt application rate was 15 g/L, the removal rates of COD, TP, and NH₄ ⁺-N were 86.7%, 67.2%, and 62.6%, respectively. The sludge maintained good carbon removal ability. When the salt application rate exceeded 15 g/L, the removal rates of all indicators showed a downward trend. The application of low concentrations of heavy metals accelerated the start-up of granular sludge and targeted microorganisms for nitrogen and phosphorus removal, which had reference for the treatment of pollutants in high salt wastewater.

Key words: aerobic granular sludge, sequencing batch reactor, high salt wastewater

摘要：

南疆地区的土壤表层含盐量大，漫灌用水引起盐分溶解，污染地表水，研究降解高盐废水脱氮除磷的技术尤为重要。在高径比（R _H/D）为7.5的序批式间歇反应器（SBR）内接种活性污泥，以合成废水（含0.25 mg/L Ni²⁺）为进水，分析污泥颗粒化过程中的污泥形态、污染物去除性能、微生物群落的变化，以及盐度胁迫下颗粒污泥去除高盐废水中污染物的能力。结果表明，成熟的颗粒污泥呈黄色多元状，平均粒径为357 μm，对废水中COD、TP和NH₄ ⁺-N的平均去除率分别为95%、91.27%和94.5%，优势菌属为动胶菌属（Zoogloea）、黄杆菌属（Flavobacterium）和Unclassified_f_Comamonadaceae，进水水质会改变微生物的相对丰度，而对菌群结构无明显影响；NaCl投加量为15 g/L时，COD、TP和NH₄ ⁺-N去除率分别为86.7%、67.2%和62.6%，污泥保持良好的除碳能力，NaCl投加量超过15 g/L时，各指标的去除率均呈下降趋势。投加低浓度的重金属，加速了颗粒污泥的启动，并靶向选择脱氮除磷的微生物，对高盐废水中污染物的处理具有借鉴意义。

关键词: 好氧颗粒污泥, 序批式间歇反应器, 高盐废水

CLC Number:

X703.1

Fei XIAO, Shimin WANG, Zhuangzhuang JIA, Fengde ZHAO. Study on the formation of aerobic granular sludge induced by Ni²⁺ and the removal of nitrogen and phosphorus in the treatment of high salinity wastewater[J]. Industrial Water Treatment, 2024, 44(8): 178-186.

肖飞, 王世民, 贾壮壮, 赵峰德. Ni²⁺诱导好氧颗粒污泥形成及处理高盐废水脱氮除磷研究[J]. 工业水处理, 2024, 44(8): 178-186.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2023-0844

https://www.iwt.cn/EN/Y2024/V44/I8/178

Figures/Tables 6

Table 1 Synthetic and actual wastewater quality

项目	COD	NH₄ ⁺-N	NO₂ ^--N	NO₃ ^--N	TP	pH
合成废水	150~550	30~75	10~14	<12	10~15	7.5~8.0
实际废水	335	55			6.2	7.0~8.2

Fig.1 Changes of COD，NH₄ ⁺-N and TP concentrations

Fig.2 Evolution of microbiota at phyla level and genus level

Fig.3 Changes of COD，NH₄ ⁺-N，and TP concentrations under different NaCl conditions

Fig.4 Morphological differences of granular sludge

Fig.5 The process of granulation and salinity differentiation of granular sludge

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Study on the formation of aerobic granular sludge induced by Ni²⁺ and the removal of nitrogen and phosphorus in the treatment of high salinity wastewater

Ni²⁺诱导好氧颗粒污泥形成及处理高盐废水脱氮除磷研究

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