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A method for deep removal of phosphorus in water by calcined limonite

A limonite and water removal technology, applied in the direction of separation methods, chemical instruments and methods, water pollutants, etc., can solve the problems of high price, little prospect, and waiting for development, and achieve high acid resistance and recovery of adsorption capacity.

Active Publication Date: 2017-05-31
ANHUI MEIZIRAN ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adsorption materials modified with rare earth elements have high phosphorus removal efficiency, but are expensive and have little prospect for popularization and application
Inexpensive and efficient adsorbents for phosphorus removal are still to be developed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Select limonite ore with a goethite content greater than 60% and a porous structure;

[0035] Crushing and sieving limonite ore to obtain limonite particles with a particle size between 1-2 mm;

[0036] Calcining the above-mentioned limonite particles at 300-350° C. for 10 minutes to obtain nanostructured calcined limonite particles with hematite as the main phase;

[0037] The above-mentioned calcined limonite particles are packed into a filter column with a diameter of 100mm and a height of 1500mm, and the filling height is 1000mm, as a simulated deep phosphorus removal filter;

[0038] The simulated water with a phosphorus concentration of 1mg / L prepared from tap water was used as the experimental water, and it flowed through the simulated deep phosphorus removal filter with a hydraulic retention time of 2 hours. The phosphorus concentration of the treated water was always less than 0.1mg / L after 6 months of operation;

[0039] Then, simulated water with a phosphoru...

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Abstract

The invention discloses a method for deeply removing phosphorus in water by using calcined limonite. The method is characterized by comprising the steps of calcining limonite particulates with the particle sizes of 0.5-3mm at the temperature of 250-500 DEG C to obtain nanometer structured calcined limonite particulates with hematite as a main physical phase, filling a water treatment tank for deeply removing phosphorus with the nanometer structured calcined limonite particulates, and then, treating sewage through enabling the sewage to flow through the water treatment tank for deeply removing phosphorus in a filtering way of keeping hydraulic retention time within 0.5-2 hours, wherein the concentration of phosphorus in the treated effluent is smaller than 0.1mg / L; and enabling the adsorbed and saturated limonite particulates to sequentially pass through a NaOH water solution and a hydrochloric acid solution to soak and regenerate. The calcined limonite particulates provided in the method have an efficient specific adsorption effect on a trace of phosphorus in water, the concentration of phosphorus in the effluent can reach the standard of a second-class ground water body, and the effective period of adsorption operation can exceed four years.

Description

[0001] 1. Technical field [0002] The invention relates to a method for deeply removing phosphorus from domestic sewage. [0003] 2. Background technology [0004] With the aggravation of water pollution, eutrophication has generally occurred in surface water bodies in my country. The state has set up a major special project for water pollution control to conduct research, invested huge sums of money in the construction of urban sewage treatment facilities, and improved the treatment rate of urban domestic sewage. However, at present, the aerobic activated sludge process is generally used in the treatment of urban domestic sewage, but the concentrations of total nitrogen and total phosphorus in the effluent water of aerobic biological treatment still reach 20-35 mg / L and 0.3-3.0 mg / L respectively, which are the main factors for lake water. 10-50 times of the second standard. In many cases, it is difficult for domestic sewage to meet the national first-class A discharge stand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/42C02F1/28B01J20/34C02F101/10C02F101/16
Inventor 周其胤陈天虎陈斌
Owner ANHUI MEIZIRAN ENVIRONMENTAL TECH
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