Biological Activated Carbon Fluidized Bed: Degradation Effect and Chemical Potential Change of Bio-diesel Wastewaters

doi:10.11924/j.issn.1000-6850.casb20190500097

Abstract

Abstract:

To solve the problem of difficult and low efficient biochemical treatment of bio-diesel wastewater, we treated the bio-diesel wastewater by adopting the biological activated carbon fluidized-bed process and studied the degradation effect and chemical potential change of test system COD. The results indicated that: the test system had good treatment effect, and the COD concentration of terminal effluent could meet the Standard of Level I B in GB 18918-2002 by using the four-level series system; the basic process of test system COD removal could be described by two-level reaction: adsorption-aerobic biodegradation; COD removal rate in the aerobic degradation reaction increased as the series increased, indicating that the total contribution of aerobic degradation was positively correlated with levels of system series; the chemical potential of test system COD removal reaction was a negative value and its absolute value increased as unit series increased, indicating that the system COD removal was a spontaneous reaction, the ability to remove COD was strengthened with the increase of series levels, and aerobic biodegradation played a significant role in stable treatment effect of the maintenance system.

Key words: bio-diesel wastewater, activated carbon, aerobic biodegradation, COD, chemical potential change

CLC Number:

X703

Liu Zixuan, Shi Hui, Wang Ping, Wang Peiying, Zhu Jian. Biological Activated Carbon Fluidized Bed: Degradation Effect and Chemical Potential Change of Bio-diesel Wastewaters[J]. Chinese Agricultural Science Bulletin, 2020, 36(20): 77-82.

Figures/Tables 6

References 26

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处理单元	系统Ⅰ		系统Ⅱ		去除率差异r_Ⅰ-r_Ⅱ/%	好氧降解率r_a/%
处理单元	c_Ⅰ/(mg/L)	r_Ⅰ/%	c_Ⅱ/(mg/L)	r_Ⅱ/%	去除率差异r_Ⅰ-r_Ⅱ/%	好氧降解率r_a/%
进水	2743.5	0	2743.5	0	0	0.0
A	1331.7	50.8	2321.5	14.2	36.6	42.6
B	501.7	81.5	1870.5	30.9	50.6	73.2
C	359.2	86.7	1585.8	41.4	45.3	77.3
D	57.6	97.9	972.6	64.1	33.8	94.1

处理单元	系统Ⅰ		系统Ⅱ		去除率差异r_Ⅰ-r_Ⅱ/%	好氧降解率r_a/%
处理单元	c_Ⅰ/(mg/L)	r_Ⅰ/%	c_Ⅱ/(mg/L)	r_Ⅱ/%	去除率差异r_Ⅰ-r_Ⅱ/%	好氧降解率r_a/%
进水	2743.5	0	2743.5	0	0	0.0
A	1331.7	50.8	2321.5	14.2	36.6	42.6
B	501.7	81.5	1870.5	30.9	50.6	73.2
C	359.2	86.7	1585.8	41.4	45.3	77.3
D	57.6	97.9	972.6	64.1	33.8	94.1

处理组	进水浓度c₀/(mg/L)	出水浓度/(mg/L)
处理组	进水浓度c₀/(mg/L)	c_Ⅰ（吸附+好氧生物降解）	c_Ⅱ（仅有吸附作用）
n₁	2743.5	1331.7	2321.5
n₂	2743.5	501.7	1870.5
n₃	2743.5	359.2	1585.8
n₄	2743.5	57.6	972.6

处理组	进水浓度c₀/(mg/L)	出水浓度/(mg/L)
处理组	进水浓度c₀/(mg/L)	c_Ⅰ（吸附+好氧生物降解）	c_Ⅱ（仅有吸附作用）
n₁	2743.5	1331.7	2321.5
n₂	2743.5	501.7	1870.5
n₃	2743.5	359.2	1585.8
n₄	2743.5	57.6	972.6