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Seawater zero discharge treatment system and treatment method

A treatment system and treatment method technology, applied in the field of seawater zero discharge treatment system, can solve the problems of ecological environment impact, waste of high-quality chemical resources, etc., and achieve the effects of environmental friendliness, good economic and social benefits, and strong operability

Pending Publication Date: 2021-05-11
SUNUP ENVIRONMENTAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

These treatment methods not only have a serious impact on the ecological environment, but also waste a large amount of high-quality chemical resources contained in concentrated seawater

Method used

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  • Seawater zero discharge treatment system and treatment method

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Embodiment

[0035] In one embodiment, the seawater treatment method of the seawater zero-discharge treatment system includes the following steps:

[0036] 1) 1 cubic meter of seawater in the seawater intake tank is pumped into the sand filter to remove suspended solids, colloids and microplastics in the seawater, and then enters the first nanofiltration system to separate the first and second salts to obtain 640L nanofiltration fresh water and 360L nanofiltration Filter concentrated water, nanofiltration fresh water is rich in monovalent salts, nanofiltration concentrated water is rich in divalent metal salts;

[0037] 2) The nanofiltration concentrated water of the first nanofiltration system is rich in calcium ions, magnesium ions and sulfate ions, enters the first reaction tank, and evenly adds 6.86L of 10% oxalic acid solution to the second reaction tank through the oxalic acid dosing device In the first reaction tank, after stirring and reacting for 60 minutes, the feed liquid in the...

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Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a seawater zero discharge treatment system and method. The system comprises a seawater taking pool, the seawater taking pool is sequentially connected with a pretreatment system, a first nanofiltration system, a reverse osmosis system, an auxiliary reverse osmosis concentration system, an evaporation system, a COD removal system and a bipolar membrane system through pipelines, the auxiliary reverse osmosis concentration system is provided with a drawn liquid concentration system in a matched mode, the osmotic pressure of the two ends of a reverse osmosis membrane is effectively reduced, and the concentration ratio is improved. The first nanofiltration system is further sequentially connected with a first reaction tank, a first precipitation system, a second reaction tank, a second precipitation system, a second nanofiltration system, a third reaction tank, a third precipitation system, a fourth reaction tank and a fourth precipitation system. Calcium, magnesium, sulfate radicals and other components in seawater are effectively extracted, sodium chloride can be extracted for preparing refined salt, therefore, reasonable utilization of resources can be realized, and the method is environment-friendly and has good economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a seawater zero-discharge treatment system and treatment method. Background technique [0002] In recent years, seawater desalination has gradually become one of the most important technical approaches to solve the current global shortage of freshwater resources, and the technical level and industrial scale of seawater desalination have developed rapidly. Among them, the impact of the seawater desalination process and its products on the ecological environment has increasingly become one of the key influencing factors. The concentrated seawater produced by desalination equipment has high salinity, complex chemical composition, and other chemical substances added in the seawater pretreatment process. Therefore, scientific and reasonable treatment and comprehensive utilization of concentrated seawater are of great significance. In some special areas, such as th...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/30C02F103/08
CPCC02F9/00C02F1/442C02F1/66C02F1/54C02F1/5245C02F1/441C02F1/048C02F2101/30C02F1/444C02F1/001C02F2103/08
Inventor 谭斌黄传敏方毓淳俞海燕方燕梅
Owner SUNUP ENVIRONMENTAL TECH CO LTD
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