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Denitrification method for synthetic ammonia industry sewage

A technology for industrial wastewater and ammonia synthesis, applied in chemical instruments and methods, special compound water treatment, water pollutants, etc., can solve the problems of high dosing cost, inconvenient maintenance and repair, affecting water effluent, etc., and reduce the amount of alkali used for neutralization. , Good hydraulic stirring effect, and the effect of preventing sludge deposition

Active Publication Date: 2016-07-27
武汉森泰环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is that the consumption of steam increases the operating cost, and the recovery and utilization value of ammonia nitrogen after treatment is not high.
Starch has high carbon content and is easy to obtain. However, starch has a polysaccharide structure and needs to be fully hydrolyzed before it can be absorbed and utilized by bacteria. Starch has low solubility in water, and the hydrolysis time is relatively long, and the residue will affect the water output.
Glucose is a monosaccharide, easy to dissolve, and bacteria can directly absorb and utilize it, but the carbon content of glucose is low, the price is relatively high, and the cost of adding is high
Methanol is a small molecular organic compound with high carbon content and easy solubility. When used as a carbon source, the denitrification rate is relatively fast. The disadvantage is that methanol is volatile and is a flammable, explosive and hazardous chemical. It is dangerous, and methanol is toxic, and when the cumulative concentration in wastewater exceeds 200mg / L, it can inhibit the growth of microorganisms
Using a submersible mixer to stir can solve the problem of water distribution uniformity, and the mud-water mixing effect is better, but because the equipment is installed underwater, it is inconvenient to maintain and repair, and the energy consumption is relatively large
In addition, the submersible mixer adopts continuous stirring method, which is easy to cause the sludge to be broken and affect the effect of flocculation and sedimentation

Method used

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  • Denitrification method for synthetic ammonia industry sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The wastewater discharge of a synthetic ammonia production enterprise is about 3200m 3 / d, the wastewater quality is as follows: total nitrogen about 300mg / L, BOD 5 About 200mg / L, SS about 400mg / L, pH: 8-10. Adopt method of the present invention to treat waste water, concrete steps are as follows:

[0039] The waste water is pre-treated through the oil-separating grit chamber and regulating tank to remove fine cinders, oil slicks and other impurities. The pretreated effluent is lifted to a two-stage A / O biological treatment system with a lift pump. The residence time of wastewater in each pool of two-stage A / O is: A1 pool: 6.0h, O1 pool: 16h, A2 pool: 3h, O2 pool: 8h. Each of A1 and A2 is equipped with a set of pulse water distribution system for uniform water distribution and mixing. The pulse generating device can evenly distribute the muddy water mixture entering the pulse water distributor within 5 minutes through the perforated water distribution pipe in about 1...

Embodiment 2

[0042] Synthetic ammonia waste water volume 2000m 3 / d, the total nitrogen in the wastewater is about 350mg / L, the COD is about 340mg / L, the BOD is about 250mg / L, and the pH is about 9. After the wastewater is pretreated, the effluent is lifted to the two-stage A / O biological treatment system with a lift pump. The residence time of wastewater in each pool of two-stage A / O is: A1 pool: 5h, O1 pool: 12h, A2 pool: 3h, O2 pool: 10h. Among them, A1 and A2 are each equipped with a set of pulse water distribution system for uniform water distribution and mixing. The pulse generating device can evenly distribute the muddy water mixture that enters the pulse water distributor within 4 minutes through the perforated water distribution pipe within about 12 seconds. At the bottom of the pool, the hole diameter of the water distribution pipe is 20mm. The O1 and O2 pools are aerated with Roots blowers and microporous aerators. An online dissolved oxygen meter is installed in the pools to ...

Embodiment 3

[0045] Synthetic ammonia waste water volume 1700m 3 / d, the total nitrogen in the wastewater is about 290mg / L, the COD is about 300mg / L, the BOD is about 240mg / L, and the pH is about 9. After the wastewater is pretreated, the effluent is lifted to the two-stage A / O biological treatment system with a lift pump. The residence time of wastewater in each pool of two-stage A / O is: A1 pool: 6h, O1 pool: 18h, A2 pool: 2h, O2 pool: 8h. Among them, A1 and A2 are equipped with a set of pulse water distribution system for uniform water distribution and mixing. The pulse generating device can evenly distribute the mud-water mixture that enters the pulse water distributor within 3 minutes through the perforated water distribution pipe within about 10 seconds. At the bottom of the pool, the hole diameter of the water distribution pipe is 25mm. The O1 and O2 pools are aerated with Roots blowers and microporous aerators. An online dissolved oxygen meter is installed in the pool to monitor ...

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Abstract

The invention discloses a denitrification method for synthetic ammonia industry sewage.Two-stage A / O combination technology is adopted, and sodium acetate is added into a pond A2 to serve as an external carbon source.A2 and O2 are sequentially arranged based on the traditional A1 / O1 technology to form the two-stage A / O combination technology, biological denitrification is conducted by controlling different sludge return ratios and nitration liquid reflux ratios, and the ammonia nitrogen and total nitrogen removal rate can reach 90% or above and is much higher than that of the one-stage A / O technology.Sodium acetate is added into the pond A2 to replace the other external carbon source, sodium acetate is used for hydrolyzing alkaline chemical properties, and the alkalinity needed in the nitrifying process can be supplemented while the carbon source is supplemented.Reaction conditions needed by denitrification are guaranteed, and the operating cost is greatly reduced.

Description

technical field [0001] The invention relates to a method for denitrification of synthetic ammonia industrial wastewater, which belongs to the technical field of environmental protection. Background technique [0002] Ammonia nitrogen is one of the factors leading to eutrophication of water bodies. According to statistics, the ammonia nitrogen discharge of my country's chemical enterprises ranks first in the national industrial industry, and the ammonia nitrogen discharge of the synthetic ammonia industry accounts for about 50%. Ammonia nitrogen pollution is intensified, and excessive ammonia nitrogen makes the dissolved oxygen in the water drop continuously, aggravating the eutrophication of the water body. The problem of water pollution in the synthetic ammonia industry has become increasingly prominent, and has become an important factor restricting the sustainable development of my country's synthetic ammonia industry. [0003] Wastewater from synthetic ammonia producti...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F101/16
CPCC02F3/302C02F2101/16C02F2203/002C02F2203/006C02F2305/06
Inventor 彭继伟李海波官圣灵邹彬黄凯
Owner 武汉森泰环保股份有限公司