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Method for preparing desalted water with internal circulating water conductivity lower than 10 muS/cm in closed circulating water system

A closed-loop and internal-circulation technology, used in water/sewage treatment, water treatment parameter control, chemical instruments and methods, etc., and can solve problems such as shortening membrane life.

Pending Publication Date: 2021-04-30
XIAN CHANGQING TECH ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, fiber ball filter or multi-media filter is used for primary filtration and one-stage reverse osmosis desalination to prepare desalted water with conductivity ≤10μS / cm, which is suitable for raw water TDS (Total dissolved solids, TDS for short) 300-1000mg / L, but if the raw water TDS is 1000-3000mg / L, then the water production rate is generally 30%-35%, and the membrane life is shortened to about 2 years

Method used

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  • Method for preparing desalted water with internal circulating water conductivity lower than 10 muS/cm in closed circulating water system

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no. 1 approach

[0031] This embodiment relates to a method for preparing desalted water with a conductivity of circulating water in a closed circulating water system lower than 10 μS / cm, including:

[0032] introduce raw water;

[0033] Raw water enters the pretreatment unit through the pipeline, intercepts solid particles and absorbs impurities;

[0034] The effluent from the pretreatment unit enters the primary pre-desalination unit with a desalination rate of >97%;

[0035] The outlet water of the primary pre-desalination unit enters the intermediate water tank, and the pH value of the water quality in the intermediate water tank is adjusted to weak alkaline;

[0036] The outlet water from the intermediate water tank enters the secondary fine desalination unit, and the desalination rate is >97%;

[0037] The effluent of the secondary fine desalination unit is supplied to the downstream water point;

[0038] The above pretreatment unit, the primary pre-desalination unit, the intermediate...

no. 2 approach

[0045] This embodiment relates to a method for preparing desalted water with a conductivity of circulating water in a closed circulating water system lower than 10 μS / cm, including:

[0046] introduce raw water;

[0047] Raw water enters the pretreatment unit through the pipeline, intercepts solid particles and absorbs impurities;

[0048] The effluent from the pretreatment unit enters the primary pre-desalination unit with a desalination rate of >97%;

[0049] The outlet water of the primary pre-desalination unit enters the intermediate water tank, and the pH value of the water quality in the intermediate water tank is adjusted to weak alkaline;

[0050] The outlet water from the intermediate water tank enters the secondary fine desalination unit, and the desalination rate is >97%;

[0051] The effluent of the secondary fine desalination unit is supplied to the downstream water point;

[0052] The above pretreatment unit, the primary pre-desalination unit, the intermediate...

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Abstract

The invention provides a method for preparing desalted water with internal circulating water conductivity lower than 10 muS / cm in a closed circulating water system, which comprises the following steps of introducing raw water, introducing the raw water into a pretreatment unit through a pipeline, introducing the effluent of the pretreatment unit into a primary pre-desalination unit, introducing the effluent of the primary pre-desalination unit into an intermediate water tank, and regulating the pH value of the water in the intermediate water tank to alkalescence, enabling the effluent of the intermediate water tank to enter a secondary fine desalination unit, and supplying the effluent of the secondary fine desalination unit to a downstream water point. According to the method, a quartz sand filter and an activated carbon filter are used for pretreatment, suspended solids in water are removed, TDS in the water is removed to 40 mg / L at the moment, and the conductivity is about 80 microseconds per centimeter; a primary reverse osmosis membrane is adopted for pre-desalination, the desalination rate is larger than 97%, secondary reverse osmosis is fine desalination, the desalination rate is larger than 97%, at the moment, TDS in water is removed to 5 mg / L, the conductivity is about 10 microseconds / cm, the water production rate is increased to 40%-45%, and the service life of the membrane is prolonged to about 5 years.

Description

technical field [0001] The invention belongs to the field of closed circulating water systems, and in particular relates to a method for preparing desalted water in which the conductivity of circulating water in the closed circulating water system is lower than 10 μS / cm. Background technique [0002] Desalinated water refers to the finished water obtained after removing suspended solids, colloids, inorganic cations, anions and other impurities in water by using various water treatment processes. At present, fiber ball filter or multi-media filter is used for primary filtration and one-stage reverse osmosis desalination to prepare desalted water with conductivity ≤10μS / cm, which is suitable for raw water TDS (Total dissolved solids, TDS for short) 300-1000mg / L, but if the raw water TDS is 1000-3000mg / L, then the water production rate is generally 30%-35%, and the membrane life is shortened to about 2 years. Contents of the invention [0003] The purpose of the embodiments...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/001C02F1/283C02F1/441C02F1/66C02F1/52C02F1/50C02F5/00C02F2209/05C02F2209/10Y02A20/131
Inventor 冯启涛伏渭娜王国柱王莉娜
Owner XIAN CHANGQING TECH ENG