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Biogas slurry deamination and ammonia recovery method

An ammonia recovery and biogas slurry technology, which is applied in the fields of biogas slurry deamination and ammonia recovery, can solve the problems of excess consumption load, large amount of biogas slurry, low utilization efficiency of compound nutrient fertilizer, etc. Effect

Active Publication Date: 2014-03-05
DONGGUAN CAMDA GENERATOR WORK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of economical and applicable treatment methods to utilize the biogas slurry, most of the biogas slurry is directly used for farmland application without any recycling treatment, and the utilization efficiency of compound nutrient fertilizers in the biogas slurry is low; and with the biogas project The continuous expansion of the biogas slurry by-product is large and exceeds the consumption load, and the untreated discharge will cause pollution to the water quality of the regional water body

Method used

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  • Biogas slurry deamination and ammonia recovery method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Take 3000 ml of biogas slurry, add lime to adjust its pH value to 9.5, let it stand for 2 hours, take 1500 ml of supernatant, add 500 ml to each of biogas slurry bottles 2a, 2b, and 2c, and put them in each ammonia suction bottle Add 10% dilute sulfuric acid to 5a, 5b, and 5c, add saturated lime water to the lye absorption bottle 4, close the valves K1, K2-2, and K3-2, turn on the vacuum pump 8, vacuumize, and adjust the vacuum degree E1 to be equal to 0.05 MPa, then adjust the opening of the outlet valves of the biogas slurry bottles 2a, 2b, and 2c so that the biogas slurry in each biogas slurry bottle 2a, 2b, and 2c is exhausted within 1 hour. The ammonia nitrogen content of the biogas slurry was analyzed, and compared with the content of the biogas slurry in the biogas slurry bottles 2a, 2b, and 2c, the removal rate of ammonia nitrogen was obtained:

[0036] The deamination rate of 1a deamination tower---76.5%, the deamination rate of 1b deamination tower-...

Embodiment 2

[0037] Embodiment 2, take 3000 ml of biogas slurry, add lime to adjust its pH value to 12.2, leave it for 2 hours, take 1500 ml of supernatant, add 500 ml to each of biogas slurry bottles 2a, 2b, and 2c, and put them in each ammonia suction bottle Add 10% dilute sulfuric acid to 5a, 5b, and 5c, add saturated lime water to the lye absorption bottle 4, close the valves K1, K2-2, and K3-2, turn on the vacuum pump 8, vacuumize, and adjust the vacuum degree E1 to be equal to 0.07 MPa, then adjust the opening of the outlet valves of the biogas slurry bottles 2a, 2b, and 2c so that the biogas slurry in each biogas slurry bottle 2a, 2b, and 2c is exhausted within 1 hour. The ammonia nitrogen content of the biogas slurry was analyzed, and compared with the content of the biogas slurry in the biogas slurry bottles 2a, 2b, and 2c, the removal rate of ammonia nitrogen was obtained:

[0038] 1a deamination tower deamination rate---84.2%, 1b deamination tower deamination rate---73.7%, 1c de...

Embodiment 3

[0039]Example 3: Take 3000 ml of biogas slurry, add lime to adjust its pH value to 10.5, leave it for 2 hours, take 1500 ml of supernatant, add 500 ml to each of the biogas slurry bottles 2a, 2b, and 2c, and put them in each ammonia suction bottle Add 10% dilute sulfuric acid to 5a, 5b, and 5c, add 10% sodium hydroxide solution to the lye absorption bottle 4, close the valves K1, K2-2, and K3-2, turn on the vacuum pump 8, vacuumize, and adjust the vacuum E1 is equal to 0.055MPa, and then adjust the opening of the outlet valves of the biogas slurry bottles 2a, 2b, and 2c so that the biogas slurry in each biogas slurry bottle 2a, 2b, and 2c is pumped out within 1 hour. , 6c, the biogas slurry was taken to analyze the ammonia nitrogen content, and compared with the biogas slurry content in the biogas slurry bottles 2a, 2b, and 2c, the removal rate of ammonia nitrogen was obtained:

[0040] 1a deamination tower deamination rate---75%, 1b deamination tower deamination rate---72.6%,...

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Abstract

The invention discloses a biogas slurry deamination and ammonia recovery method which comprises the following steps of starting a vacuum pump, and extracting the air in a deamination tower to a vacuum state, wherein the deamination tower is filled with a solid filler; spraying the biogas slurry in a biogas slurry bottle into the deamination tower through a spray head while absorbing the air into the deamination tower, wherein the ammonia gas in the biogas slurry goes out to be mixed with the air; inputting the air mixed with ammonia gas into an ammonia absorption bottle through an air pipe, wherein a sulfuric acid solution is contained in the ammonia absorption bottle, and the ammonia absorption bottle absorbs the ammonia gas in the air to obtain an ammonia sulfate solution to finish the ammonia recovery. The method disclosed by the invention can effectively recover ammonia gas in the biogas slurry, thereby increasing the economic benefits and avoiding the environmental pollution.

Description

technical field [0001] The invention relates to a compound nutrient recovery method, in particular to a biogas slurry deammonization and ammonia recovery method technology. Background technique [0002] The treatment of high-concentration organic waste (livestock and poultry manure, organic waste, straw, etc.) by biogas fermentation technology will produce a large amount of biogas slurry, which is rich in compound nutrients such as ammonia nitrogen and is a good liquid fertilizer. Due to the lack of economical and applicable treatment methods to utilize the biogas slurry, most of the biogas slurry is directly used for farmland application without any recycling treatment, and the utilization efficiency of compound nutrient fertilizers in the biogas slurry is low; and with the biogas project The continuous expansion of the biogas slurry by-product is large and exceeds the consumption load, and the untreated discharge will cause pollution to the water quality of the regional wa...

Claims

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Application Information

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IPC IPC(8): C01C1/242
Inventor 蒋宏华沈剑山
Owner DONGGUAN CAMDA GENERATOR WORK
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