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Method for carbon source replacement for denitrification process in wastewater treatment

A carbon source and wastewater technology, applied in the adjustment method of biological treatment, natural water body treatment, water treatment parameter control and other directions, can solve the problems of microbial viability and activity effect, and achieve the effect of cost saving

Pending Publication Date: 2021-12-31
BASF SE
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is challenging because microbial viability and activity can be affected by the replacement of one carbon source by another

Method used

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  • Method for carbon source replacement for denitrification process in wastewater treatment
  • Method for carbon source replacement for denitrification process in wastewater treatment
  • Method for carbon source replacement for denitrification process in wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Different turnover percentages were compared during the carbon source change from ethylene glycol (EG) to glucose. In Trial 1, the glucose percentage was initially increased by 10%, eg 10%, 20%, 30%, 40% and 50%, and maintained for 10 days after each replacement. The glucose percentage is then increased faster than the start, eg 70%, 90% and 100%, and each increase also runs steadily for 10 days. During test 1, the denitrification performance was good and stable, and the outlet TN was less than 20mg / L. In experiment 2, the replacement speed was faster than experiment 1, and the percentage of glucose was set to 20%, 40%, 60%, 80%, 100%, and each time was kept for 10 days, and the denitrification was found to be unstable, and the outlet TN exceeded 70mg many times / L (standard: 45mg / L). The mixture of ethylene glycol (EG) and glucose had a ratio of total COD to total nitrogen in the wastewater of 3.5 in the test.

[0060] Table 1 Comparison of the second carbon source ...

Embodiment 2

[0063] In order to examine the effect of the duration after each increase in the replacement carbon percentage, trials 3, 4, and 5 were carried out, with durations of 20 days, 5 days, and 30 days, respectively. In Experiment 3, the denitrification performance was good and stable, similar to Experiment 1 (10 days). In Trial 4, the outlet TN was higher than 50 mg / L several times due to the short run time (only 5 days) after the percentage conversion was increased. In Trial 4, no improvement in denitrification performance was seen after extending to 30 days, consuming a longer time. According to comparative experiments, it is recommended to choose 10-20 days as the maintenance time. In the test, the ratio of the total chemical oxygen demand of the mixture of ethylene glycol (EG) and glucose to the total amount of nitrogen in the wastewater was 3.5.

[0064] Table 2 Comparison of the duration of each displacement

[0065]

Embodiment 3

[0067] To investigate the effect of COD / TN ratio on nitrogen removal performance during carbon source switching from ethylene glycol (EG) to glucose, the first experiments were performed in beakers under the condition that 50% of the first carbon source was replaced. The same sludge was added to seven 1.0L beakers to prepare 1000mg / L initial TN and carbon source was added, COD / TN weight ratio (g / g) was 2.0, 3.0, 3.5, 4.0, 4.5, 5.0. Samples were taken from the beaker every 4 hours and analyzed for COD and TN.

[0068] ·TN removal

[0069] COD / TN = 2.0, TN removal is not complete, outlet TN ~ 500mg / L, when the COD / TN ratio is 3.0, 3.5, 4.0, 4.5, 5.0 and 6.0, the final TN is ~ 20mg / L, see figure 1 .

[0070] · Residual carbon (COD)

[0071] With the increase of COD / TN, the residual COD will increase. When COD / TN=6.0, the residual COD in the outlet wastewater is greater than 1000mg / L. When COD / TN=2.0, 3.0, 3.5, 4.0, 4.5, 5.0, 6.0, the final COD is 246, 245, 266, 409, 579, 599...

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Abstract

The present invention relates to a method for the carbon source replacement for denitrification process in wastewater treatment.

Description

technical field [0001] The invention relates to a carbon source replacement method in the denitrification process in wastewater treatment. Background technique [0002] Today, increasing nitrate pollution has rapidly developed into an important environmental problem, both in industrialized and developing countries. According to the 2009 China Environmental Bulletin, among the 641 sampling wells in 8 districts including Beijing, Liaoning, Jilin, Shanghai, Jiangsu, Hainan, Ningxia, and Guangdong, 73.8% of the wells contained more than 20 mg NO 3 -N·L -1 nitrates, which exceed the drinking water standard set by the US Environmental Protection Agency (USEPA) (10mgNO 3 -N·L -1 ) 2 times. In addition, China's wastewater discharge limits for total nitrogen (TN) are becoming more and more stringent. For example, the water quality standard (2015) for sewage discharged into urban sewers requires that the outlet TN be less than 70mg / L (A and B) and less than 45mg / L (C ); Pollutant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F3/30
CPCC02F3/006C02F3/305C02F2305/06C02F2209/08C02F2209/16C02F2101/163C02F2103/36
Inventor F·王D·唐S·富歇K-H·孙J-U·朴H·黄V·蒂埃布勒蒙
Owner BASF SE
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