Method for removing phosphorus from wastewater by utilizing coal ash

A waste water and coal powder ash technology, applied in the environmental field, can solve the problems of large chemical consumption, difficult treatment, high cost of phosphorus removal, etc., and achieve good chemical adsorption effect

Active Publication Date: 2016-02-03
NANTONG CELLULOSE FIBERS CO LTD
View PDF5 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have a common feature, that is, they need to consume a large amount of chemical agents, and produce a large amount of hydrous chemical sludge, which is difficult to dehydrate and handle, making the cost of phosphorus removal relatively high.

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 phosphorus from wastewater by utilizing coal ash
  • Method for removing phosphorus from wastewater by utilizing coal ash
  • Method for removing phosphorus from wastewater by utilizing coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 (Example 1 is used to illustrate that the method provided by the invention is also applicable to inorganic phosphorus.)

[0034] (1) Take 200 mL of simulated wastewater prepared with sodium dihydrogen phosphate at a concentration of 5000 mg / L (calculated as P) into a 250 mL Erlenmeyer flask, and adjust the pH of the wastewater to 6.0 with 2 mol / L hydrochloric acid.

[0035] (2) Add quantitatively 30g of coal powder ash with a calcium oxide content of 25%, the mass ratio of coal powder ash to waste water is 3:20, and react at a constant temperature of 55°C for 1 hour under magnetic stirring (300 rpm).

[0036] (3) Separation of waste water and coal dust after the reaction. Filter with WhatmanNo1# filter paper, adopt plasma emission spectrometry (ICP) and pH meter to test the total phosphorus and pH value in the filtrate, and its total phosphorus content is 51mg / L, and pH is 12.29. Phosphorus removal efficiency reaches 99.0%. The experimental results show that...

Embodiment 2

[0038] (1) Take 200 mL of simulated wastewater prepared with methylphosphonic acid at a concentration of 2155 mg / L (calculated as P) into a 250 mL Erlenmeyer flask, and adjust the pH of the wastewater to 6.8 with 20% sodium hydroxide.

[0039] (2) Add quantitatively 15g of coal powder ash with a calcium oxide content of 25%, the mass ratio of coal powder ash to wastewater is 3:40, and react at a constant temperature of 55°C for 1 hour under magnetic stirring (300 rpm).

[0040] (3) Separation of waste water and coal dust after the reaction. Filter with WhatmanNo1# filter paper, adopt plasma emission spectrometry (ICP) and pH meter to test the total phosphorus and pH value in the filtrate, and its total phosphorus content is 93mg / L, and pH is 12.08. Phosphorus removal efficiency reaches 95.7%. The experimental results show that coal fly ash not only has a strong chemical adsorption effect on orthophosphorus, but also has a strong removal effect on organic phosphorus.

Embodiment 3

[0042] Get industrial waste water, through ion chromatographic analysis, total phosphorus (calculated as P) in water is 155mg / L, wherein contains 63.3% orthophosphorus, 36.7% organic phosphorus. The organic phosphorus content in the form of methylphosphonic acid is 43.5mg / L (accounting for 76.5% of organic phosphorus), and the content of organic phosphorus in the form of dimethylphosphonic acid is 13.4mg / L (accounting for 23.5% of total organic phosphorus).

[0043] (1) Take the above-mentioned 200mL industrial wastewater into a 250mL Erlenmeyer flask, and adjust the pH of the wastewater to 6.5 with 20% sodium hydroxide.

[0044] (2) Add quantitatively 7.5g of coal powder ash with a calcium oxide content of 25%, the mass ratio of coal powder ash to waste water is 3:80, and react at a constant temperature of 55°C for 1 hour under magnetic stirring (300 rpm).

[0045] (3) Separation of waste water and coal dust after the reaction. Filter with WhatmanNo1# filter paper, use plasma ...

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 phosphorus from wastewater by utilizing coal ash, belonging to the field of environmental technologies. The method comprises the following steps: (1) providing phosphorus-contained wastewater containing at least one organic phosphorus, and adjusting the value of the wastewater to weak acidity; (2) adding the coal ash into the pH-adjusted wastewater, and carrying out heating under stirring and allowing the coal ash and the wastewater to react and adsorb; and (3) after the reaction is completed, separating the wastewater and the coal ash. The method provided by the invention utilizes the coal ash to remove most of inorganic phosphorus and a part of the organic phosphorus in the wastewater, and the total phosphorus-removal efficiency can reach more than 50%. After phosphorus removal, the coal ash solves the problem of stability due to high content of active calcium oxide in coal ash, and can be used as a raw material of a building material for utilization, so the effect of using wastes to treat the wastes is achieved.

Description

technical field [0001] The invention belongs to the technical field of environment and relates to a method for removing phosphorus in waste water by using fly ash. Background technique [0002] Phosphorus is an important nutrient element in the biosphere, and usually exists in various forms such as orthophosphate, metaphosphate, polyphosphate and organic phosphorus. It is generally believed that phosphorus is the limiting factor for plant growth. Excessive phosphorus content in the water body will cause eutrophication of the water body, resulting in the rapid reproduction of algae and other plankton, the decrease of dissolved oxygen in the water body, the deterioration of water quality, and the massive death of fish and other organisms. Eutrophication pollution of water bodies is very common all over the world (including our country), and our country attaches great importance to it. The "Comprehensive Discharge Standard for Sewage" (GB8978-1996) clearly stipulates that the ...

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 Applications(China)
IPC IPC(8): C02F1/28
Inventor 曹建国彭为骏张杰顾海兵杨广美
Owner NANTONG CELLULOSE FIBERS CO LTD
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