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Multi-stage coupled zero-discharge water treatment system for BDP wastewater

A water treatment system and zero discharge technology, applied in the direction of water/sewage multi-stage treatment, water/sewage treatment, special compound water treatment, etc., can solve problems such as difficult treatment, high salinity, and increased difficulty of treatment, and achieve in-depth Strong processing capacity, improved processing efficiency, and strong adsorption performance

Active Publication Date: 2018-12-21
山东默锐环境产业股份有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] Bisphenol A-(bisdiphenyl phosphate) referred to as BDP is a phosphorus-based halogen-free flame retardant. At present, a large part of the flame retardants used in domestic modified plastics are still halogen-containing flame retardants. It will produce a lot of harmful gases. With the enhancement of environmental protection awareness, the demand for such halogen-free flame retardants is becoming more and more urgent. Because the compatibility, thermal stability and flame retardancy of BDP and polymers are better than those of ordinary phosphorus It is a flame retardant, so it has been widely used in production in recent years, but due to technological reasons, its wastewater contains more toluene, phenol (sodium phenate), bisphenol A and a small amount of phosphorus oxychloride and intermediate products, which has a high Bioinhibition, traditional physicochemical and biochemical methods are difficult to deal with, and the salt content is high (containing about 1% NaCl), which further increases the difficulty of treatment
[0003] In recent years, as a green, efficient and stable water treatment technology, photocatalytic technology has become a research hotspot, and it has been more and more used in the field of sewage treatment. Photocatalytic technology has strong oxidation ability and wide application range. The degradation is not selective, but at present, due to the problems of difficult separation and easy poisoning of nano-catalysts in the practical application of this technology, and the most widely used TiO 2 Although the efficiency is high and the performance is stable, the utilization rate of visible light is low, which seriously affects the industrialization process of photocatalyst technology

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) Sand filter: The BDP wastewater is firstly passed through a sand filter to initially remove large particles and colloidal substances in the wastewater. The sand filter used in the sand filter is quartz sand with a particle size of 1-3 mm.

[0046] (2) Air flotation tank: the BDP waste water is passed through the air flotation tank, and the unreacted solvent toluene is separated by air flotation, and the solid particle suspension in the water is further removed at the same time. The sewage treatment capacity of the air flotation tank is 9m 3 / h.

[0047] (3) Visible light catalytic reaction tank: the waste water after air flotation separation is passed through the visible light catalytic reaction tank, and the bottom of the visible light catalytic reaction tank is inclined 12° downward along the water flow direction; the water outlet of the visible light catalytic reaction tank and A return pipe is provided between the water inlets, and a return pump is provided on t...

Embodiment 2

[0052] The nano-Au / TiO 2 The loading method of the catalyst is the multiple impregnation and pulling method, and the number of leaching and loading is 8 times. After each impregnation, it is dried at a temperature of 70°C before continuing to the next loading; after loading, it is calcined for 2 hours under an inert atmosphere protected by nitrogen, and the The temperature is 400°C.

[0053] The nano-Au / TiO 2 The preparation method of the catalyst is a photochemical reduction deposition method, which includes the following steps: first, water and isopropanol are mixed in a ratio of 1:1 and placed in a photochemical reaction bottle, and then the concentration of 3g / L nano-TiO 2 Slowly add the aqueous phase dispersion into the photochemical reaction bottle, fully stir and mix evenly, seal the photochemical reaction bottle, pass in argon gas for deoxygenation for 1 hour; then irradiate under a 500W long-arc high-pressure mercury lamp. mol / L of HAuCl 4 The solution was slowly a...

Embodiment 3

[0055] The loaded nano TiO 2 The preparation method of the molecular sieve pellets is as follows: 3.6g Ti(SO 4 ) 2 Dissolve in 150ml distilled water, stir rapidly until completely dissolved, Ti(SO 4 ) 2 Aqueous solution is transferred in the three-necked flask, takes by weighing 5g molecular sieves and joins in the three-necked flask, stirs and makes molecular sieve to Ti(SO 4 ) 2 Fully adsorb and mix; then dissolve 1.35g urea in 50ml distilled water, stir until completely dissolved, then slowly drop the aqueous solution of urea into the Ti(SO 4 ) 2 In the three-necked flask of the mixed solution with molecular sieve, after the dropwise addition of the urea solution, heat to 75°C and stir for 4 hours, then transfer the mixed solution to a high-pressure reactor, conduct a hydrothermal reaction at 90°C for 24 hours, and pour out the solution after the reaction is completed and cooled to room temperature , washed several times, dried, and calcined at 450°C for 2h.

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Abstract

The invention discloses a multi-stage coupled zero-discharge water treatment system for BDP wastewater. The multi-stage coupled zero-discharge water treatment system comprises (1) an air floatation tank, (2) a visible-light catalytic reaction tank, (3) an MBR reaction tank, (4) an ultraviolet photocatalytic reaction tank and (5) an MVR concentration device; the BDP wastewater passes through the air floatation tank to achieve air flotation and separation of unreacted solvent toluene, and suspended solid particles are removed; the wastewater passes through the visible-light catalytic reaction tank, a nano Au / TiO2 catalyst is laid at the bottom of the reaction tank; the wastewater follows through an anaerobic zone and an aerobic zone of the MBR reaction tank; the wastewater passes through theultraviolet photocatalytic reaction tank, and ultraviolet photocatalysts are molecular sieve balls loaded with nanometer TiO2; high-salinity water is concentrated by the MVR concentration device toobtain sodium chloride concentrate and pure water. The multi-process-coupled near-zero-discharge water treatment system developed for the BDP wastewater has the advantages that the advantages of eachmodule are fully developed and the optimal water treatment effect is achieved.

Description

technical field [0001] The invention relates to the technical field of advanced treatment of industrial sewage with high salt and high biological inhibition, in particular to a BDP wastewater multi-stage coupling zero-discharge water treatment system. Background technique [0002] Bisphenol A-(bisdiphenyl phosphate) referred to as BDP is a phosphorus-based halogen-free flame retardant. At present, a large part of the flame retardants used in domestic modified plastics are still halogen-containing flame retardants. It will produce a lot of harmful gases. With the enhancement of environmental protection awareness, the demand for such halogen-free flame retardants is becoming more and more urgent. Because the compatibility, thermal stability and flame retardancy of BDP and polymers are better than those of ordinary phosphorus It is a flame retardant, so it has been widely used in production in recent years, but due to technological reasons, its wastewater contains more toluene,...

Claims

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Application Information

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IPC IPC(8): C02F9/14C01D3/04C02F103/04C02F101/34
CPCC01D3/04C02F1/001C02F1/048C02F1/24C02F1/30C02F1/32C02F1/44C02F1/725C02F3/1205C02F3/301C02F9/00C02F2101/345C02F2305/10
Inventor 王志孝杨建伟姜绍龙刘玉辉甄冠胜孙广金张伟华
Owner 山东默锐环境产业股份有限公司
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