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Processing method of salt containing water and salt containing processing system

A treatment method and concentrated water technology, which is applied in the brine treatment system and the brine treatment field, can solve the problems of operation complexity, increased equipment investment cost, operation and maintenance cost, and complicated process flow, so as to achieve simple process flow and reduce Investment cost and operation and maintenance cost, and the effect of simplifying the operation process

Active Publication Date: 2015-12-23
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] This method combines membrane separation technologies such as nanofiltration, ultrafiltration, reverse osmosis, and high-pressure flat membrane to treat high-salt wastewater. Although it can overcome the shortcomings of a single treatment process, the process is complicated, and on the one hand, it increases the investment of the device. costs and O&M costs, on the other hand increases operational complexity

Method used

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  • Processing method of salt containing water and salt containing processing system
  • Processing method of salt containing water and salt containing processing system
  • Processing method of salt containing water and salt containing processing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] This embodiment adopts figure 1 The system shown treats a brine, in which a synthetic brine was used to simulate the pretreated wastewater, the composition of which is shown in Table 1.

[0104] Table 1

[0105] project

COD

Na +

Ca 2+

Cl -

SO 4 2-

TDS

Supersaturation (CaSO 4 )

unit

mg / L

mg / L

mg / L

mg / L

mg / L

mg / L

％

value

96.00

1311.12

488.51

2021.89

1170.08

4991.60

48.02

[0106] The first nanofiltration separation unit used in this embodiment is a first-stage one-stage nanofiltration system composed of 8 Dow NF90-400 nanofiltration membrane elements; the normal temperature crystallization separation unit is a total volume of 15m 3 The clarifier; the first reverse osmosis separation unit is a one-stage two-stage reverse osmosis system composed of 16 Dow BW30-400 reverse osmosis membrane elements. The influent flow of synthetic brine is 10.00m 3 / ...

Embodiment 2

[0115] This embodiment adopts figure 2 The system shown treats a brine, wherein the pretreated wastewater is simulated with a synthetic brine, the composition of which is the same as that used in Example 1.

[0116] The first nanofiltration separation unit, the first reverse osmosis separation unit and the room temperature crystallization separation unit used in this example are the same as those in Example 1. The second nanofiltration separation unit used in this embodiment is the same as the first nanofiltration separation unit. The influent flow of synthetic brine is 10.00m 3 / h, the specific process is as follows.

[0117] (1) The flow rate is 10.00m 3 / h synthetic salt water, after adding 5.0mg / L scale inhibitor (active ingredient is organic phosphonate, Nalco Company, OSMOTREATOSM1035) to it, enter the first nanofiltration separation unit for nanofiltration separation, Among them, the inlet pressure of nanofiltration is 1.0MPa, and the flow rate is 6.80m 3 / h of th...

Embodiment 3

[0126] This embodiment adopts image 3 The system shown treats a brine, wherein the pretreated wastewater is simulated using a synthetic brine with the same composition as the synthetic water used in Example 1.

[0127] The first nanofiltration separation unit and normal temperature crystallization separation unit used in this example are the same as those in Example 1. The first reverse osmosis separation unit used in this example is a one-stage one-stage reverse osmosis system composed of eight Dow BW30-400 reverse osmosis membrane elements. The second reverse osmosis separation unit used in this example is a one-stage one-stage reverse osmosis system composed of six Dow SW30XLE-440i reverse osmosis membrane elements. The influent flow of synthetic brine is 10.00m 3 / h, the specific process flow of the present embodiment is as follows.

[0128] (1) The flow rate is 10.00m 3 / h synthetic salt water, after adding 5.0mg / L scale inhibitor (active ingredient is organic phosph...

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Abstract

The invention discloses a salt containing water processing method and system. The processing comprises the following steps: subjecting salt containing water to nano filtration and separation to obtain nano filtration producing water and nano filtration concentrated water; subjecting nano filtration producing water to reverse osmosis separation to obtain product water and reverse osmosis concentrated water; and subjecting nano filtration concentrated water to normal temperature crystallization and separation. The provided salt containing water processing method and system has the advantages that the technology procedure is concise, the investment, operation, and maintenance costs can be reduced prominently, and the operation procedure is simplified. The provided method and system are used to process salt containing water, and can obtain a water recovery rate of 90% or more; only about 10% of concentrated water is separated through evaporation and crystallization, and thus the working amount of the evaporation and crystallization step is greatly reduced. In the other aspect, during the processing process, the ions in the salt containing water can be separated according to the valence state, and thus comprehensive utilization of recyclable resources in salt containing water can be achieved.

Description

technical field [0001] The invention relates to the field of water treatment, in particular, the invention relates to a treatment method containing brine, and the invention also relates to a treatment system containing brine. Background technique [0002] With the increasing level of environmental protection in China, contradictions such as insufficient water resources and limited environmental capacity have become increasingly prominent. In the production process of petrochemical and coal chemical industry, a large amount of saline wastewater will be produced. It is of great practical significance to treat these saline wastewater and realize the recycling of wastewater. [0003] CN104692574A discloses a treatment method for high-salt wastewater, the method comprising the following steps: (1) high-salt wastewater enters a regulating tank through a pipeline for water quality and water quantity adjustment, and then enters a high-density sedimentation tank, and the high-density...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F9/04C02F9/10
Inventor 陈权卫昶霍卫东
Owner CHNA ENERGY INVESTMENT CORP LTD
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