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Zero-discharge water treatment process for high-salt-content water containing calcium and magnesium ions

A treatment process, high salt content technology, applied in the field of water treatment, can solve the problems of high chemical cost, water treatment system shutdown, pipeline blockage, etc., to achieve the effect of reducing evaporation, simplifying the process flow and reducing investment

Active Publication Date: 2021-04-06
詹利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, the chemical agent precipitation method has high agent cost; the formed precipitates such as calcium sulfate, calcium carbonate, and magnesium hydroxide are disposed of as solid waste; the filter unit is prone to pipeline blockage, which leads to the shutdown of the entire water treatment system

Method used

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  • Zero-discharge water treatment process for high-salt-content water containing calcium and magnesium ions
  • Zero-discharge water treatment process for high-salt-content water containing calcium and magnesium ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: 1250m 3 / h mine water (Na + 905mg / L, K + 6.7mg / L, Ca 2+ 51.9mg / L, Mg 2+ 13.6mg / L, HCO 3 - 680mg / L, Cl - 374mg / L, SO 4 2- 864mg / L, NO 3 - 6.86mg / L) and 800kg / h chelating agent (sodium glutamate) at a temperature of 40°C, when the pH is 6, stir in the reactor for 2 hours;

[0031] After the chelating liquid I is treated by ultrafiltration membrane under the pressure of 0.2Mpa, the particles, bacteria, colloids, suspended matter, macromolecular organic matter, virus, turbidity, etc. in the chelating liquid I are removed, and 1250800kg / h chelating liquid is obtained. Liquid II;

[0032] Concentrate the prepared chelate solution II through 1# reverse osmosis membrane under the pressure of 2Mpa. The concentrated 13200kg / h chelating liquid III enters the concentrated water side for dechelating liquid separation, and the 1237600kg / h produced water side fresh water is collected and reused as secondary water;

[0033] The prepared 13200kg / h chelate soluti...

Embodiment 2

[0037] Example 2: 30m 3 / h power plant desulfurization wastewater (Na + 1180mg / L, K + 382mg / L, Ca 2+ 1310mg / L, Mg 2+ 18200mg / L, NH 4 + 10mg / L, HCO 3 - 80mg / L, Cl - 10600mg / L, SO 4 2- 46900mg / L, NO 3 - 125mg / L) and 4300kg / h chelating agent (sodium glutamate) at a temperature of 40°C, when the pH is 6, stir in the reactor for 2 hours;

[0038] Add 720kg / h quicklime (CaO) to the chelating solution to prepare amino acid water-soluble fertilizer. A 36500kg / h amino acid-containing water-soluble fertilizer liquid product meeting the requirements of NY1429-2010 was prepared.

example example 3

[0039] Example 3: 20m 3 / h power plant desulfurization wastewater (Na + 2008mg / L, K + 320mg / L, Ca 2+ 554mg / L, Mg 2+ 13820mg / L, NH 4 + 22.9mg / L, HCO 3 - 517mg / L, CO 3 2- 279mg / L, Cl - 8678mg / L, SO 4 2- 54100mg / L, NO 3 - 693mg / L) and 2900kg / h chelating agent (sodium glutamate) at a temperature of 40°C, when the pH is 6, stir in the reactor for 2 hours;

[0040] Add 630kg / h quicklime (CaO) to the chelating solution to prepare amino acid water-soluble fertilizer. A 24500kg / h amino acid-containing water-soluble fertilizer liquid product meeting the requirements of NY1429-2010 was prepared.

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Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a zero-discharge water treatment process for high-salt-content water containing calcium and magnesium ions. The water treatment process comprises the following steps: preparing a chelating solution, carrying out ultrafiltration on the chelating solution, carrying out primary concentration on the chelating solution, separating the chelating solution, carrying out secondary concentration on the chelating solution, blending a water-soluble fertilizer, drying the water-soluble fertilizer, and preparing crystalline salt. The water treatment process has the advantages that calcium and magnesium ions are recycled, the process and control parameters are simple, the overall project investment is low, and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a zero-discharge treatment process for salt water containing calcium and magnesium ions. Background technique [0002] In the field of water treatment, calcium and magnesium ions in water are softened by adding chemicals to form calcium carbonate, calcium sulfate or magnesium hydroxide and other precipitates, and then filter units are used to control the calcium and magnesium content within 50~100mg / L. [0003] However, regardless of the precipitation and dissolution equilibrium of calcium carbonate, calcium sulfate or magnesium hydroxide and other precipitates in the solution, there are ions Ca in the solution that make up the precipitate. 2+ , CO 3 2- , SO 4 2- , Mg 2+ , OH - . The filter unit can only filter out the precipitate in the solution, but not the ions in the solution. This is a mechanistic defect in the chemical agent precipitation method....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C05C11/00C05G5/20C05G5/10C01D3/04C01D3/14C02F101/10
CPCC02F9/00C05C11/00C05G5/20C05G5/10C01D3/04C01D3/14C02F1/444C02F1/441C02F1/442C02F1/68C02F2101/10
Inventor 詹利
Owner 詹利