Method for treating and recycling high-concentration ammonia nitrogen and COD sewage

A high-concentration ammonia and ammonia nitrogen recovery technology, applied in neutralization water/sewage treatment, water/sewage treatment, degassed water/sewage treatment, etc., can solve the problems of high-concentration ammonia nitrogen and COD sewage treatment and reuse, and achieve Increased processing costs, high cost, and easy-to-operate effects

Inactive Publication Date: 2020-07-10
北京耀智环保科技有限公司 +1
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The technical problem to be solved in the present invention is to provide a treatment and reuse method for high-concentratio

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
  • Method for treating and recycling high-concentration ammonia nitrogen and COD sewage
  • Method for treating and recycling high-concentration ammonia nitrogen and COD sewage
  • Method for treating and recycling high-concentration ammonia nitrogen and COD sewage

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0059] Embodiment 1, the treatment and reuse of high-concentration ammonia nitrogen and COD sewage

[0060] as attached figure 1 As shown in the figure, it is a treatment and reuse system for high-concentration ammonia nitrogen and COD sewage. The specific process of the treatment and reuse system for treating sewage containing high-concentration ammonia nitrogen and COD is divided into three parts. The first part is the first part in the dosing tank T1 The pH value of the sewage is increased, and the metal ions in the sewage are removed and the sewage is discharged to the heating tank T9; the second part is to recover the ammonia nitrogen in the sewage in the ammonia nitrogen recovery tank T8; the third part is to The ammonia nitrogen and COD are used in the ozone reaction tank T2 for catalytic ozone method. After the powdered catalyst is put into the ozone reaction tank T2, the powdered catalyst in the sewage will enter the microfiltration ceramic membrane, and the microfil...

Example Embodiment

[0067] Embodiment 2, the influence of sewage pH on ammonia helium removal rate

[0068] Ammonia in sewage is ammonium ion (NH 4 + ) and free ammonia (NH 3 ) to maintain balance, and its balance relationship is shown in formula (1):

[0069] NH 4 + +OH - ←→NH 3 +H 2 O (1)

[0070] It can be seen from formula (1) that the pH of sewage is one of the main factors affecting the solubility of free ammonia in water. With the increase of sewage pH, the solubility of ammonia in the liquid phase decreases, the equilibrium moves to the right, and the removal rate of ammonia nitrogen increases. Generally, NaOH and Ca(OH) are used to adjust the pH of sewage. Due to Ca(OH), it is easy to foul the tower equipment. In most cases, NaOH is used as a regulator. The countercurrent stripping tower was used to treat and strip the sewage with ammonia concentration of 3000mg / L. The ammonia nitrogen removal rate increased with the increase of the pH of the sewage. When the pH reached 10, the ...

Example Embodiment

[0071] Embodiment 3, the influence of stripping temperature on ammonia nitrogen removal rate

[0072] When the temperature is higher, the volatilization rate of ammonia is greater than the dissolution rate, and the equilibrium of equation (1) shifts to the right. Therefore, in the stripping process, selecting an appropriate stripping temperature can improve the stripping efficiency. The high-concentration ammonia nitrogen sewage (1716.2 mg / L) was treated by stripping method to remove ammonia nitrogen. Under the conditions of air volume of 1.0m / h, sewage pH of 11 and stripping time of 60min, the effect of stripping temperature of 70-80℃ on the removal rate of ammonia nitrogen was investigated. The experimental results show that the ammonia nitrogen removal rate can be stabilized at more than 90% when the pH of the wastewater is finally determined to be 10.0-12.0 and the influent temperature is 70-80 °C. In the treatment of ammonia nitrogen sewage, it was found that the higher...

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 method for treating and recycling high-concentration ammonia nitrogen and COD (Chemical Oxygen Demand) sewage. The method comprises the following specific steps: pre-treatingthe sewage, removing ammonia nitrogen in the sewage by air stripping and steam stripping methods, removing ammonia nitrogen and COD in the sewage by a catalytic ozonation method, and performing filtering. The treatment process comprises the following steps: removing most of ammonia nitrogen in water by using air stripping and steam stripping methods, removing residual ammonia nitrogen by using acatalytic ozonation method, decomposing COD in the water into carbon dioxide and discharging the carbon dioxide, and finally, filtering a catalyst and residual COD in the water by using a two-stage ceramic membrane and a reverse osmosis system to enable the water to be dischargeable or recyclable. The method has the advantages of being good in removal effect, simple in technological process, easyto operate and the like, ammonia nitrogen obtained after air stripping can be recycled in the form of ammonia water or ammonium sulfate, and the purpose of resource recycling can be achieved.

Description

technical field [0001] The invention relates to a treatment and reuse method for sewage, in particular to a treatment and reuse method for high-concentration ammonia nitrogen and COD sewage. Background technique [0002] my country is rich in rare earth resources, supporting the world's main rare earth production capacity. my country's rare earth resources mainly include Baotou mixed rare earth ore, Sichuan bastnaesite, and southern ionic rare earth ore. The problem of COD wastewater pollution is very serious. [0003] The rare earth smelting, processing and production process will generate a large amount of wastewater, with large discharge volume, complex components, and high concentration. The wastewater contains high-concentration ammonia nitrogen, high-concentration COD and other pollutants, which must be properly disposed of. In the process of organic extraction, saponification and precipitation in the rare earth smelting process, there are a lot of discharge problems ...

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
IPC IPC(8): C02F9/10C02F101/16
CPCC02F9/00C02F2209/08C02F2209/14C02F1/66C02F1/20C02F1/725C02F1/78C02F1/444C02F1/441C02F2209/06C02F2209/02C02F2101/16
Inventor 黄玉春石建胡可弦
Owner 北京耀智环保科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap