Reverse osmosis strong brine concentration method and equipment

A technology of concentrated brine and reverse osmosis, applied in chemical instruments and methods, reflux water treatment, water/sewage treatment, etc., can solve problems such as difficulty in starting up for the first time, large power consumption, heat loss, etc., and achieve easy automatic control and reduce concentration cost and reduce overall energy consumption

Active Publication Date: 2018-07-27
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Considering the high salinity characteristics of reverse osmosis concentrated brine, the concentration technology used has the following technical problems: (1) For the evaporation pond technology, the evaporation concentration occupies a large area, has high requirements on light and climate conditions, and has a long concentration cycle, which greatly reduces It improves its concentration efficiency and economic benefits, and the concentration of reverse osmosis concentrated brine is low
(2) Due to the large number of heat exchanges, the multi-effect evaporation technology causes heat loss and increases the treatment cost; it is suitable for concentrated treatment of sewage and wastewater with medium salinity, and its equipment system is more complicated
(3) Evaporation and concentration technologies such as mechanical compression and re-evaporation, as an upgraded v

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  • Reverse osmosis strong brine concentration method and equipment
  • Reverse osmosis strong brine concentration method and equipment
  • Reverse osmosis strong brine concentration method and equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0030] use figure 2 For the concentration equipment shown, the raw material liquid of the forward osmosis device is the above-mentioned 6% reverse osmosis concentrated brine, and the drawing liquid is 3M MgCl 2 solution, the membrane is a polyethersulfone membrane, and the orientation of the membrane is FO mode; the membrane distillation device is a direct contact membrane distillation, the membrane adopts a polyvinylidene fluoride flat membrane, and the raw material solution is reverse osmosis concentrated brine that has been concentrated by forward osmosis.

[0031] First, 6% reverse osmosis concentrated brine is pumped out of the raw material liquid tank with a circulating water pump through a constant temperature heating device at 25°C-35°C, and the flow rate is adjusted to 80L / h through a flow meter, and then sent to the raw material liquid side of the forward osmosis membrane module Circulation; at the same time, the draw liquid is pumped out from the draw liquid tank w...

Embodiment 2

[0035] use image 3 For the concentration equipment shown, the raw material liquid of the forward osmosis device is the above-mentioned 6% reverse osmosis concentrated brine, and the drawing liquid is 3M MgCl 2 solution, the membrane is polyethersulfone membrane, and the orientation of the membrane is FO mode; the membrane distillation device is vacuum membrane distillation, and the membrane adopts polyvinylidene fluoride flat membrane, and the raw material solution is reverse osmosis concentrated brine that has been concentrated by forward osmosis.

[0036] First, 6% reverse osmosis concentrated brine is pumped out of the raw material liquid tank with a circulating water pump through a constant temperature heating device at 25°C-35°C, and the flow rate is adjusted to 80L / h through a flow meter, and then sent to the raw material liquid side of the forward osmosis membrane module Circulation; at the same time, the draw liquid is pumped out from the draw liquid tank with a circu...

Embodiment 3

[0041] use figure 2 For the concentration equipment shown, the raw material liquid of the forward osmosis device is the above-mentioned 6% reverse osmosis concentrated brine, and the drawing liquid is 3M MgCl 2 The solution, the membrane is a polysulfone membrane, and the orientation of the membrane is FO mode; the membrane distillation device is a direct contact membrane distillation, and the membrane adopts a polyvinylidene fluoride flat membrane, and the raw material solution is reverse osmosis concentrated brine that has been concentrated by forward osmosis.

[0042] First, 6% reverse osmosis concentrated brine is pumped out of the raw material liquid tank with a circulating water pump through a constant temperature heating device at 25°C-35°C, and the flow rate is adjusted to 80L / h through a flow meter, and then sent to the raw material liquid side of the forward osmosis membrane module Circulation; at the same time, the draw liquid is pumped out from the draw liquid tan...

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Abstract

The invention discloses a reverse osmosis strong brine concentration method and equipment. The concentration method comprises the following processes of (1) a positive osmosis concentration process: using reverse osmosis strong brine as raw material liquid, so that the water in the raw material liquid passes through a positive osmosis film to enter the liquid suction side through the effect of suction liquid, salt in the raw material liquid is intercepted at the raw material liquid side, and the raw material liquid can be concentrated; (2) a film distillation concentration process: conveying the raw material liquid concentrated in the step (1) to a hot side of a film distillation film; performing cooling by circulation water at the cold side of the film distillation film or vacuum suction,so that the water at the hot side passes through the film distillation film in a water vapor form to enter the cold side, the raw material liquid at the hot side loses water, and the raw material liquid is further concentrated. The concentration equipment comprises a positive osmosis device, a film distillation device and a strong brine tank. According to the concentration method and equipment, the positive osmosis is used as the film distillation pretreatment technology to perform deep concentration on the reverse osmosis strong brine, so that the whole energy consumption is reduced; the treatment of the reverse osmosis strong brine and the subsequent resource utilization are realized at low energy consumption and high concentration efficiency.

Description

technical field [0001] The invention belongs to the field of waste water treatment. Specifically, it relates to a method and equipment for concentrating reverse osmosis concentrated brine. Background technique [0002] Since the breakthrough of reverse osmosis technology in the 1960s, it has been widely used in the desalination industry, which has largely alleviated the shortage of fresh water resources. However, based on the concentration principle of the reverse osmosis process, it will produce a quarter of the by-products per unit volume of seawater it treats—reverse osmosis concentrated brine, with a salt content as high as 60,000mg / L-80,000mg / L. Including Cl - 、Na + , Ca 2+ , Mg 2+ 、K + and other inorganic ions. If the concentrated brine is directly discharged into the environment, it will pollute the water body and endanger the organisms in the water body. Moreover, salt is also a resource, and direct discharge also causes a waste of resources. Therefore, how ...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F1/445C02F1/447C02F2209/40C02F2301/04
Inventor 张立秋
Owner BEIJING FORESTRY UNIVERSITY
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