Unlock instant, AI-driven research and patent intelligence for your innovation.

System and method for hierarchical treatment of nitrogen-containing organic matter based on supercritical water oxidation reaction

A technology of supercritical water oxidation and graded treatment, which is applied in oxidation treatment of sludge, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc., and can solve problems such as difficulty in achieving standard discharge and excessive total nitrogen concentration in effluent , to achieve the effects of convenient operation, reduced oxygen demand, and improved biodegradability

Active Publication Date: 2020-06-19
XI AN JIAOTONG UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the industrialized supercritical water oxidation system, in order to balance the investment and operation effect, the general operating parameter is about 600°C. At this lower temperature, the nitrogen element in the organic matter is converted into ammoniacal nitrogen by the supercritical water oxidation reaction. or nitrate nitrogen, the total nitrogen concentration in the effluent exceeds the standard, and it is difficult to meet the standard discharge

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • System and method for hierarchical treatment of nitrogen-containing organic matter based on supercritical water oxidation reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] The material is stored in the material storage tank 1 and pumped into the thermal hydrolysis tank 2 for thermal hydrolysis reaction, then enters the preheater 3 for secondary preheating, and then enters the heater 4. The material that has been fully heated and pressurized enters the reactor I5 and mixed with oxygen, the first stage of supercritical water oxidation reaction occurs, and the organic nitrogen in the material is converted into inorganic nitrogen (including ammonia nitrogen and nitrate nitrogen) , and then enter the reactor II6. At this time, the heating device on the reactor II6 is in the shutdown state, and the oxygen tank 7, the chemical tank I8, the chemical tank II9 and the physical denitrification unit 11 do not inject substances into the reactor II6. After the reaction, the hot fluid comes out of the reactor II6 and enters the preheater 3, and transfers heat to the cold material that enters later. The hot fluid cools down to below 100°C and enters the d...

Embodiment 2

[0081] The difference from Example 1 is that the heat tracing device of the reactor II6 is activated to heat the temperature of the fluid in the reactor II6 to 600°C-800°C, and the rest of the steps are the same as in Example 1.

Embodiment 3

[0083] The difference from Example 1 is that the heat tracing device of the reactor II6 is started, and the temperature of the fluid in the reactor II6 is heated to 600°C-800°C, and at the same time, the oxygen tank 7 injects oxygen into the reactor II6, and the remaining steps and implementation Example 1 steps are the same.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a system and a method for staged treatment of nitrogen-containing organic matters based on a supercritical water oxidation reaction. The system comprises a pyrohydrolysis unit,a supercritical water oxidation unit, a physical nitrogen removal unit and a biological nitrogen removal unit, wherein a material enters a pyrohydrolysis tank through a material storage tank to undergo a pyrohydrolysis reaction, and then enters a preheater so as to be subjected to first-stage heating; after passing through a heater, the material sequentially enters a reactor I and a reactor II soas to be subjected to a supercritical water oxidation reaction; after the reaction is finished, the fluid is depressurized by means of a pressure reducer, then passes through the physical nitrogen removal unit and the biological nitrogen removal unit in turn for advanced treatment, and is finally discharged when reaching the standard. The nitrogen-containing organic matters are treated step by step by means of the supercritical water oxidation reaction, the physical nitrogen removal unit and the biological nitrogen removal unit, so that the staged treatment of the nitrogen-containing mattersin high-concentration refractory organic wastewater is realized, and up-to-standard discharge is finally achieved; the cost is lowered while the treatment effect is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and environmental protection, and in particular relates to a system and method for classified treatment of nitrogen-containing organic matter based on supercritical water oxidation reaction. Background technique [0002] In recent years, a large number of lakes and rivers in my country have frequently experienced water eutrophication incidents, seriously endangering the ecological environment. Ammonia nitrogen and total nitrogen can be used as indicators to evaluate the eutrophication of water bodies. When the nitrogen element in the water body exceeds the standard, it will cause a large number of microorganisms to multiply and lead to eutrophication of the water body. Total nitrogen refers to the total amount of nitrogen in various forms in water, mainly including ammonia nitrogen, nitrate nitrogen, nitrite nitrogen and various organic nitrogen. Ammonia nitrogen refers to the nitrogen ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/72C02F11/08C02F101/38
CPCC02F1/02C02F1/025C02F1/727C02F3/30C02F9/00C02F11/086C02F2101/38
Inventor 王树众杨健乔李建娜宋文瀚杨闯王栋李艳辉
Owner XI AN JIAOTONG UNIV