Immobilization and efficacy of an aerobic denitrifier

doi:10.3969/j.issn.1000-5641.2021.04.001

Abstract

Abstract:

To improve the environmental tolerance and nitrogen removal efficiency of an aerobic denitrifier, polyvinyl alcohol (PVA), sodium alginate (SA), and rice hull powder were used as immobilized carriers for an aerobic denitrifier and the performance was subsequently evaluated. The results showed that the optimal ratio of immobilized particles was a mixture of 12% PVA, 8% sodium alginate (SA), 0.5 g rice hull powder, and 10 mL bacterial solution. The immobilized particles had strong stability and mass transfer capability; the removal efficiency of TN was 89.35% ~ 90.12% over 48h. The immobilized particles had good tolerance to pH and rotating speed. When the pH was 11, the removal efficiency of TN was 90%. The removal efficiency of TN and NH₄⁺-N was the highest (91.29% and 93.30%, respectively) when the speed was 120 r/min. The immobilized particles were not resistant to low temperatures (10℃ and 15℃), and the TN removal efficiency was only about 20% at 10℃. The TN removal efficiency, however, achieved 90.59% at 30℃.

Key words: aerobic denitrifer, immobilization, denitrification

CLC Number:

X522

Chao YIN, Ying LI, Tingyue ZHANG, Jiamin LIU, Tida CHEN, Dan CUI, Minsheng HUANG. Immobilization and efficacy of an aerobic denitrifier[J]. Journal of East China Normal University(Natural Science), 2021, 2021(4): 1-7.

Figures/Tables 6

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影响因素	PVA浓度/(g·(100 mL)^–1)	SA浓度/(g·(100 mL)^–1)	稻壳粉量/(g·(100 mL)^–1)	菌液量/(mL·(100 mL)^–1)	颗粒成形情况
PVA浓度	12	0.1	1	10	拖尾, 表面有气泡
	10				粘连多
	8				有拖尾
SA浓度	10	0.1	1	10	粘连多
		0.5			较好
		1			较好
稻壳粉量	10	0.5	0.5	10	较好
			1		较好
			1.5		溶液色度大
菌液量	10	0.5	1	5	较好
				10	较好
				15	较好

序号	因素				TN去除率/%
序号	A	B	C	D	TN去除率/%
1	8	0.4	0	5	76.29
2	8	0.6	0.5	10	79.02
3	8	0.8	1	15	78.28
4	9	0.4	0.5	15	76.52
5	9	0.6	1	5	77.39
6	9	0.8	0	10	73.30
7	10	0.4	1	10	77.65
8	10	0.6	0	15	75.1
9	10	0.8	0.5	5	78.46

	A	B	C	D
K₁_j	77.86	75.97	74.90	77.38
K₂_j	75.74	77.17	78.00	76.66
K₃_j	77.07	76.68	77.77	76.63
R	2.12	1.20	3.10	0.75

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