Optimization of parameters for treatment of livestock farming wastewater by algal-bacterial symbiosis

doi:10.19965/j.cnki.iwt.2022-1260

Abstract

Abstract:

Pig farm biogas slurry is high in color and turbidity with high content of nitrogen and phosphorus. The use of microalgae-bacteria symbiosis can simultaneously and efficiently remove carbon，nitrogen and phosphorus，save energy and reduce consumption，and recover resources，meeting the needs of the new era for wastewater treatment. In this study，the three parameters of light intensity，aeration intensity and the proportion of microalgae and bacteria were optimized from the perspectives of pollutant removal and microbial growth. It was found that the amount of aeration had the greatest impact on nitrogen removal，while the three parameters had little impact on carbon and phosphorus removal. After weighted evaluation，the sequence of three factors followed aeration amount>light intensity>inoculation proportion，and the optimal parameter combination is light intensity at 550 μmol/（m²·s），aeration rate at 0.2 L/min，microalgae-bacteria inoculation ratio at 1∶1. The concentrations of TP，COD，TN and NH₄ ⁺-N in the group with the best comprehensive score were 0.48，219.2，125.2，64 mg/L respectively，and the removal rates were 95.46%，88.58%，61.58% and 80.21% respectively. The particle size of microalgae-bacteria flocs in each group increased，and decreased with the increase of the microalgae-bacteria proportion.

Key words: pig farm biogas slurry, microalgae-bacteria symbiosis, parameters optimization, nitrogen and phosphorus removal

摘要：

猪场沼液高色高浊、氮磷浓度高，采用藻菌共生体可同步高效去除碳氮磷、节能降耗、资源回收，符合新时代对污水处理的需求。从污染物去除、微生物生长等角度对光照强度、曝气量和藻菌接种比例这3个参数进行优选发现，曝气量对氮去除的影响最大，而3个参数对碳、磷去除的影响较小。经加权评价得出三因素排序：曝气量>光照强度>藻菌接种比例，最优参数组合：光照强度为550 μmol/（m²·s），曝气量为0.2 L/min，藻菌接种比例为1∶1。最优组的TP、COD、TN、NH₄ ⁺-N分别为0.48、219.2、125.2、64 mg/L，TP、COD、TN、NH₄ ⁺-N去除率分别为95.46%、88.58%、61.58%、80.21%。各组中藻菌絮体粒径均呈增大趋势，且随藻菌接种比例的增大而减小。

关键词: 猪场沼液, 藻菌共生体, 参数优化, 脱氮除磷

CLC Number:

X703.1

Xinzhen WANG, Zhe ZHANG, Na LUO, Chen SUN, Chuanyi XIONG, Shengzhi WANG, Hanyu WAN, Jianxin CHEN, Kun LI. Optimization of parameters for treatment of livestock farming wastewater by algal-bacterial symbiosis[J]. Industrial Water Treatment, 2024, 44(1): 96-102.

王锌针, 张哲, 罗娜, 孙晨, 熊川懿, 王圣智, 万瀚宇, 陈建新, 李昆. 藻菌共生体处理猪场沼液的参数优化研究[J]. 工业水处理, 2024, 44(1): 96-102.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2022-1260

https://www.iwt.cn/EN/Y2024/V44/I1/96

Figures/Tables 10

References 20

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实验组	A：光照强度/（μmol·m^-2·s^-1）	B：曝气强度/（L·min^-1）	C：藻菌接种比例
1	250	0.1	1∶1
2	250	0.2	1∶5
3	250	0.5	1∶10
4	400	0.1	1∶5
5	400	0.2	1∶10
6	400	0.5	1∶1
7	550	0.1	1∶10
8	550	0.2	1∶1
9	550	0.5	1∶5

实验组	A：光照强度/（μmol·m^-2·s^-1）	B：曝气强度/（L·min^-1）	C：藻菌接种比例
1	250	0.1	1∶1
2	250	0.2	1∶5
3	250	0.5	1∶10
4	400	0.1	1∶5
5	400	0.2	1∶10
6	400	0.5	1∶1
7	550	0.1	1∶10
8	550	0.2	1∶1
9	550	0.5	1∶5

实验组	COD	TN	TP	NH₄ ⁺-N
1	88.72	57.64	86.55	75.07
2	88.13	51.67	93.97	73.02
3	86.66	46.35	93.55	73.02
4	85.84	60.45	93.98	77.95
5	89.81	55.48	90.37	77.75
6	88.88	54.52	94.61	71.58
7	86.28	55.43	92.91	74.25
8	88.56	61.58	95.46	80.21
9	86.56	52.97	93.76	75.69

实验组	COD	TN	TP	NH₄ ⁺-N
1	88.72	57.64	86.55	75.07
2	88.13	51.67	93.97	73.02
3	86.66	46.35	93.55	73.02
4	85.84	60.45	93.98	77.95
5	89.81	55.48	90.37	77.75
6	88.88	54.52	94.61	71.58
7	86.28	55.43	92.91	74.25
8	88.56	61.58	95.46	80.21
9	86.56	52.97	93.76	75.69

		A/（μmol·m^-2·s^-1）	B/（L·min^-1）	C	TP去除率/%	COD去除率/%	TN去除率/%	NH₄ ⁺-N去除率/%	综合评分/%
实验组	1	250	0.1	1	86.55	88.72	57.64	75.07	75.08
	2	250	0.2	5	93.97	88.13	51.67	73.02	73.24
	3	250	0.5	10	93.55	86.66	46.35	73.02	71.16
	4	400	0.1	5	93.98	85.84	60.45	77.95	76.67
	5	400	0.2	10	90.37	89.81	55.48	77.75	75.95
	6	400	0.5	1	94.61	88.88	54.52	71.58	73.96
	7	550	0.1	10	92.91	86.28	55.43	74.25	74.08
	8	550	0.2	1	95.46	88.56	61.58	80.21	78.65
	9	550	0.5	5	93.76	86.56	52.97	75.69	73.96
去除率	K ₁	73.16%	75.28%	75.90%
	K ₂	75.52%	75.95%	74.62%
	K ₃	75.56%	73.08%	73.73%
极差	R	2.30%	2.87%	2.17%

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