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Nanofiltration membrane blending based high salinity wastewater zero discharge processing method and device

A technology of high-salt wastewater and treatment device, applied in the field of water treatment, can solve problems such as the enrichment of salt-containing wastewater, and achieve the effects of reducing the amount of mother liquor, wide adaptability, and realizing resource utilization.

Pending Publication Date: 2018-10-09
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The nanofiltration concentrated water is used for evaporation and crystallization to obtain solids, which can obtain high-purity divalent salt products, but the nanofiltration fresh water is not concentrated to obtain monovalent salt products, resulting in the discharge of this part of saline wastewater or the richness of the system. set, the patent only addresses part of the problem of salt utilization

Method used

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  • Nanofiltration membrane blending based high salinity wastewater zero discharge processing method and device
  • Nanofiltration membrane blending based high salinity wastewater zero discharge processing method and device
  • Nanofiltration membrane blending based high salinity wastewater zero discharge processing method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] For a certain pulping wastewater, nanofiltration and crystallization cogeneration process was adopted to realize zero discharge of wastewater and recovery and reuse of industrial salt. The daily treatment capacity of pulping wastewater raw water is 40,000 tons. The main water quality parameters are shown in the table below:

[0089]

[0090] The raw water of pulping wastewater is homogenized by the homogenization tank, and then the incoming water is pretreated by sand filtration, ozone and activated carbon biological filter process. The ozone concentration is 150ppm, the ozone oxidation time is 40min; the hydraulic retention time is 15min; the carbon bed height of the activated carbon biological filter 2.0m, treatment temperature 25-30°C, empty bed contact time 20min; after pretreatment, the SS of wastewater is reduced to 12-18mg / L, the concentration of COD is reduced to 45-53mg / L, and the recovery rate of pretreated water is greater than 97%.

[0091] The pretreate...

Embodiment 2

[0098] A coal chemical company currently has a sewage treatment station with a wastewater discharge of 2750m 3 / h, the wastewater can meet the standard discharge requirements. The discharge water quality indicators are as follows:

[0099]

[0100] Inorganic salts in wastewater are mainly sodium chloride and sodium sulfate. Adopt nanofiltration and crystallization co-production process to treat wastewater with zero discharge.

[0101] Coal chemical wastewater is transported from the factory area to the zero-discharge raw water. After being homogenized in the homogenization tank, the incoming water is pretreated by sand filtration, ozone, and activated carbon adsorption processes. The ozone concentration is 200ppm, and the ozone oxidation time is 50 minutes; the activated carbon adsorption temperature is 20°C, and the hydraulic retention The time is 12 minutes; after pretreatment, the SS of wastewater is reduced to 5-9mg / L, the concentration of COD is reduced to 20-31mg / L,...

Embodiment 3

[0110] For a certain pulping wastewater, nanofiltration and crystallization cogeneration process was adopted to realize zero discharge of wastewater and recovery and reuse of industrial salt. The daily treatment capacity of pulping wastewater raw water is 40,000 tons. The main water quality parameters are shown in the table below:

[0111]

[0112] The raw water of pulping wastewater is homogenized by the homogenization tank, and then the incoming water is pretreated by sand filtration, ozone and activated carbon biological filter process. The ozone concentration is 150ppm, the ozone oxidation time is 40min; the hydraulic retention time is 15min; the carbon bed height of the activated carbon biological filter 2.0m, treatment temperature 25-30°C, empty bed contact time 20min; after pretreatment, the SS of wastewater is reduced to 12-18mg / L, the concentration of COD is reduced to 45-53mg / L, and the recovery rate of pretreated water is greater than 97%.

[0113] The pretreate...

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Abstract

The invention relates to a nanofiltration membrane blending based high salinity wastewater zero discharge processing method, and a device. The nanofiltration membrane blending based high salinity wastewater zero discharge processing method mainly comprises following steps: high salinity wastewater is delivered through a pretreatment system for impurity removing, salt extraction concentration, andsoftening; softened concentrated water is introduced into a nanofiltration blending system for blending of the concentrations of monovalent and divalent salts, so that the monovalent salt to divalentsalt concentration ratio is controlled to be 0.01 to 0.1; concentrated water discharged from the nanofiltration blending system is introduced into a sodium sulfate crystallization system for processing so as to obtain divalent salt products capable of satisfying industrial salt requirements and a sodium chloride-containing mother liquor; an obtained nanofiltration blending system penetrating fluidis delivered through an extraction concentration system, and is introduced into a sodium chloride crystallization system so as to obtain sodium chloride salt products and a sodium sulfate-containingmother liquor; the sodium chloride crystallization mother liquor is subjected to impurity removing, and is introduced into the sodium sulfate crystallization system; the sodium sulfate crystallizationmother liquor is subjected to impurity removing, and is introduced into the sodium chloride crystallization system. The nanofiltration membrane blending based high salinity wastewater zero dischargeprocessing method is capable of realizing wastewater zero discharge, and stabilizing salinity fluctuation in the crystallization systems.

Description

technical field [0001] The invention relates to a zero-discharge treatment method and device for high-salt wastewater based on nanofiltration membrane preparation, and belongs to the technical field of water treatment. Background technique [0002] The wastewater discharged from the paper industry, printing and dyeing industry, chemical industry, pharmaceutical industry, etc. contains a certain concentration of inorganic salts. The process of zero discharge of wastewater involves the process of how to separate inorganic salts from wastewater. Aiming at the zero discharge of salty wastewater, advanced oxidation pretreatment is used to reduce COD and SS. On this basis, reverse osmosis membrane is used for concentration. As the concentration ratio increases, the hardness of wastewater also gradually increases. The concentrated wastewater can use the "two alkali method" or "resin softening method" to remove the hardness in the wastewater. After the hardness-removed wastewater...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F9/10C02F9/06C02F9/08C02F9/04C02F9/02C01D5/16C01D3/14C01D3/04C02F103/28
CPCC01D3/04C01D3/14C01D5/16C02F9/00C02F5/00C02F2001/007C02F1/302C02F1/42C02F1/001C02F1/048C02F1/4693C02F1/442C02F1/444C02F1/44C02F1/441C02F1/725C02F1/722C02F3/00C02F1/78C02F2103/28C02F2301/08C02F2305/026Y02A20/131
Inventor 邢卫红张荟钦杨刚杨积衡李卫星
Owner NANJING UNIV OF TECH
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