Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for removing nitrogen and phosphorus by modifying sintered red mud

A sintering method and red mud technology, applied in the field of water treatment technology and comprehensive utilization of solid waste, to achieve the effects of low price, simple operation and good economic value

Inactive Publication Date: 2012-10-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF3 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, acid treatment has attracted much attention due to its low energy consumption and outstanding effect, but the investigation of the pH value of the adsorption medium, the concentration of adsorbate, and the amount of adsorbent in the acid treatment process has yet to be studied. In addition, the acid-modified sintering method red Nitrogen removal from sewage by mud and simultaneous removal of nitrogen and phosphorus from river water have not been reported so far

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 removing nitrogen and phosphorus by modifying sintered red mud
  • Method for removing nitrogen and phosphorus by modifying sintered red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 Nitrogen removal effect of modified sintering red mud

[0020] Take 50 mL of untreated water sample containing 20 mg / L ammonia nitrogen and pH 5.0, add 0.5 g of modified sintering red mud, shake at 25 °C and 180 r / min for 1 h, centrifuge to get the supernatant, and use The concentration of ammonia nitrogen determined by Nessler's reagent colorimetry was 6.75 mg / L, the removal rate of ammonia nitrogen was 66.5%, the adsorption capacity of ammonia nitrogen was 1.34 mg / g, and the pH of the treated water sample was 7.9.

Embodiment 2

[0021] Example 2 Phosphorus removal effect of red mud by modified sintering method

[0022] Take 40 mL of untreated water sample containing 30 mg / L orthophosphate ion and pH 2.0, add 0.2 g of modified sintering red mud, shake at 25°C and 180 r / min for 4 h, centrifuge to get the supernatant The concentration of orthophosphate was determined by the ammonium molybdate colorimetric method to be 0.09 mg / L, the removal rate of orthophosphate was 99.7%, the adsorption amount of orthophosphate was 5.96 mg / g, and the pH of the treated water sample was 4.9.

Embodiment 3

[0023] Example 3 Application of Modified Sintering Red Mud in Actual Wastewater

[0024] The actual wastewater used in this example was taken from Chengguo River, Tengzhou City, Shandong Province. The concentration of ammonia nitrogen in the water sample was 4.55 mg / L, the concentration of orthophosphate was 0.48 mg / L, and the pH of the water sample was 7.8; 0.5 g of modified The sintering red mud was added to 50 mL of river water, shaken at 25 °C and 180 r / min for 4 h, centrifuged to take the supernatant, and the concentration of ammonia nitrogen was 2.17 mg / L, and the concentration of orthophosphate was 0 mg / L. The removal rate of ammonia nitrogen was 52.2%, the removal rate of orthophosphate was 100%, and the pH of the treated water sample was 7.5.

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 relates to a method for removing nitrogen and phosphorus by modifying sintered red mud. By modifying red mud through acid, the alkalinity of the sintered red mud is reduced, the adsorability of the sintered red mud is improved, the application range of the sintered red mud is expanded, and environment pollution is reduced. The method is mainly characterized by comprising the steps: taking sintered red mud generated in the aluminum oxide industry as raw materials, adding hydrochloric acid according to certain solid-to-liquid ratio, mixing in a water bath kettle, and centrifugally drying to preparing the modified sintered red mud adsorbent. The prepared adsorbent is fed in nitrogen and phosphorus-contained sewage according to certain proportion, to achieve the purpose of removing nitrogen and phosphorus. Compared with a commonly-used bayer's method red mud adsorbent, the nitrogen and phosphorus adsorability is obviously improved under different pH or feeding amount. Therefore, the method has the advantages of being simple to prepare, small in feeding amount, wide in pH application range, low in cost and the like. The prepared adsorbent can be used for removing nitrogen and phosphorus in industrial sewage, city sewage and natural water bodies.

Description

technical field [0001] The invention relates to a method for removing nitrogen and phosphorus in sewage by modified sintering red mud, and belongs to the fields of water treatment technology and solid waste comprehensive utilization. Background technique [0002] Nitrogen and phosphorus are essential nutrients for the growth of organisms in water ecosystems. In recent years, with the intensification of human activities, excessive nitrogen and phosphorus have been discharged into the water body, resulting in abnormal reproduction of algae and other aquatic plants in the receiving water body, and eutrophication of the water body, which further reduces the transparency of the water body, the content of dissolved oxygen, and the deterioration of water quality. , impaired aquatic system function. [0003] At present, the treatment methods for reducing nitrogen and phosphorus content in water body at home and abroad can be divided into physical method, chemical method and biologi...

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): C02F1/28C02F1/58B01J20/10B01J20/30B09B3/00
Inventor 张化永张璐怡田永兰吴文思
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com