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A kind of method for removing ammonia nitrogen from anaerobic digestion effluent

A technology of anaerobic digestion and decarbonation, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. Deamination cost reduction effect

Active Publication Date: 2016-07-06
WUXI MASHENG ENVIRONMENT ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a common technical structural defect in the liquid submerged fermentation technology system: a small amount of product generates a large amount of waste water, causing environmental pollution and waste of water resources
The common disadvantage of these two methods is the need to add agents
The addition of reagents will increase the cost on the one hand; on the other hand, in the recycling process, the added reagents will have a negative impact on the process

Method used

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  • A kind of method for removing ammonia nitrogen from anaerobic digestion effluent

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Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: cassava distiller's grains anaerobic digestion effluent, total volume 100m 3 , the alkalinity is 3570mg / L, with CaCO 3 The concentration of ammonia nitrogen is 570mg / L, the temperature is directly heated to 40°C by steam with a pressure of 3atm, and air is introduced into the decarbonation tank for aeration, and the air flow rate is 5000m 3 / h, stop aeration after the pH of the anaerobic digestion effluent rises to 9.15. After the decarbonization is completed, the anaerobic digestion effluent is pumped into the stripping tower with a flow rate of 25m 3 / h, the blowing off tower is a plate tower, and the blowing off air volume is 125000m 3 / h, after a stripping tower, the removal rate of ammonia nitrogen reaches 50%. The anaerobic digestion effluent after this deammonification is used as batching water for alcoholic fermentation, and alcohol concentration is 11.89 ± 0.05% (v / v) when fermentation finishes, and the obtained fermentation result of batching ...

Embodiment 2

[0022] Embodiment 2: cassava distiller's grains anaerobic digestion effluent, total volume 100m 3 , the alkalinity is 3340mg / L, with CaCO 3 According to the calculation, the ammonia nitrogen concentration is 548mg / L. In the finned tube heat exchanger, the high-temperature flue gas with a temperature of 450°C is used to exchange heat to 70°C. Treatment, air flow of 100m during decarburization 3 / h until the pH rises to 9.46. After decarbonization, the anaerobic digestion effluent is pumped into the deammonization tower, and the feed flow rate is controlled to 20m 3 / h, the stripping tower is a packed tower, and the stripping air volume is 20000m 3 / h, after a stripping tower, the removal rate of ammonia nitrogen reaches 76%. The anaerobic digestion effluent after this deamination is used as batching water for alcoholic fermentation, and alcohol concentration is 11.95 ± 0.13% (v / v) when fermentation finishes, and the obtained fermentation result of batching with tap water is...

Embodiment 3

[0023] Embodiment 3: cassava distiller's grains anaerobic digestion effluent, total volume 300m 3 , the alkalinity is 3980mg / L, with CaCO 3 According to the calculation, the concentration of ammonia nitrogen is 773mg / L. In the shell and tube heat exchanger, the waste liquid of alcohol distillation at 90°C is used to exchange heat to make the temperature reach 50°C. The flow rate is 9000m 3 / h until the pH rises to 9.32. After the decarbonization is completed, the anaerobic digestion effluent is pumped into the deammonization tower with a flow rate of 50m 3 / h, the deamination tower is a plate tower, and the blowing air volume is 100000m 3 / h, after one stripping, the removal rate of ammonia nitrogen reaches 63%. The deammoniated anaerobic digestion effluent is used as ingredient water for alcoholic fermentation, and the alcohol concentration at the end of fermentation is 11.76±0.04% (v / v), which is equivalent to the fermentation result obtained from tap water ingredients (...

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Abstract

The invention discloses a method for removing ammonia nitrogen from anaerobic digestion effluent. According to the invention, anaerobic digestion effluent is heated and is placed into a carbon-dioxide-removing tank; and the anaerobic digestion effluent with carbon dioxide removed is subjected to a deamination treatment in a deamination tower. According to the invention, solution pH can be increased simply by aeration, such that the removal of ammonia nitrogen in a stripping tower is facilitated. Therefore, deamination cost is reduced, and the anaerobic digestion effluent satisfies the water quality requirement by main product fermentation. Also, no negative influence is caused to the process.

Description

technical field [0001] The invention relates to a method for removing ammonia nitrogen in anaerobic digestion effluent, belonging to the technical field of sewage treatment. Background technique [0002] Liquid submerged fermentation is the main channel of bulk fermentation industry technology, such as fuel ethanol, amino acids, organic acids, antibiotics, biological enzymes, vitamins, lactic acid, long-chain dibasic acids, propylene glycol, etc., and is gradually developing into a strategic bio-industry. However, there is a common technical structural defect in the liquid submerged fermentation technology system: a small amount of product generates a large amount of waste water, causing environmental pollution and waste of water resources. Taking fuel ethanol as an example, its production process produces a large amount of distillation waste liquid (about 10 tons / ton of alcohol), which has become a bottleneck restricting the development of the industry. Due to the good bio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
Inventor 张建华王柯毛忠贵张宏建陈旭升唐蕾
Owner WUXI MASHENG ENVIRONMENT ENERGY TECH CO LTD
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