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High-salt-content organic waste water treatment system and method

A technology for organic wastewater treatment and organic wastewater, applied in multi-stage water treatment, water/sewage treatment, biological water/sewage treatment, etc., can solve problems such as difficult to handle, aggravate the economic burden of enterprises, and secondary pollution of the environment, and achieve easy Achieve the effect of good water quality and simple design

Active Publication Date: 2019-01-15
SHAANXI BEIYUAN CHEM GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the reverse osmosis membrane separation device to treat high-salt organic wastewater, the discharged concentrated water is still difficult to treat due to the high content of salt and organic matter
If this part of the concentrated water is evaporated and crystallized, the salt produced by evaporation and crystallization cannot be reused because it contains various impurities, and can only be treated as solid waste or even hazardous waste, which not only increases the economic burden of the enterprise, but also causes secondary pollution to the environment
The "zero discharge" of high-salt organic wastewater treatment cannot be achieved only by using reverse osmosis and other membrane separation technologies

Method used

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  • High-salt-content organic waste water treatment system and method

Examples

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Effect test

Embodiment 1

[0080] The water quality of hydrazine hydrate wastewater produced by an enterprise is shown in Table 1. In this example, AOPs pretreatment system, FO concentration system, concentration crystallization system, coarse salt washing system and biochemical treatment system were selected.

[0081] Such as Figure 4 As shown, the method includes the following steps:

[0082] (1) Utilize hydrochloric acid (volume fraction 31%) to adjust the pH of the hydrazine hydrate wastewater of pH=12 at 4, control the hydrazine hydrate wastewater flow rate at 40m 3 / h enters the plate heat exchanger, and the waste water is heated by 0.4MPa steam and controlled at 65°C.

[0083] (2) The waste water is sent to the AOPs pretreatment system after heat exchange. The AOPs pretreatment system uses a UV oxidation reactor, in which the wavelength of the ultraviolet lamp is 400nm, and the number of ultraviolet lamps in the equipment is 3. According to the ratio of 1.5 times of the COD value in the waste...

Embodiment 2

[0094] Table 2 shows the water quality of wastewater after mercury removal in a calcium carbide process PVC production process in a factory. In this embodiment, AOPs pretreatment system, FO concentration system, concentration and crystallization system, coarse salt washing system are selected. Wastewater treatment process such as Figure 5 shown. Include the following steps:

[0095] (1) The wastewater has a pH of 8, enters the plate heat exchanger at 5t / h, heats the wastewater through 0.3MPa steam and maintains it at 75°C, and enters the AOPs pretreatment system after heating.

[0096] (2) The AOPs pretreatment system of this embodiment adopts a UV oxidation reactor, wherein the wavelength of the ultraviolet lamp is 180nm, and the number of ultraviolet lamps in the equipment is 2. According to the ratio of 5 times of the COD value in the wastewater, the oxidant is introduced, and the oxidant is selected as 30% H 2 o 2 solution, H 2 o 2 (30%) solution is added in the wa...

Embodiment 3

[0107] Table 3 shows the water quality of diphenylmethane diisocyanate (MDI) wastewater produced by a polyurethane company. In this embodiment, only AOPs pretreatment system and FO concentration system are selected. Wastewater treatment process such as Figure 6 shown. Include the following steps:

[0108] (1) Use high-purity hydrochloric acid (31%) to adjust the pH value of MDI wastewater to 6, and raise the temperature of the wastewater to 70°C through a plate heat exchanger, and enter the AOPs pretreatment system after heating.

[0109] (2) MDI waste water is 10m 3 / h enters the AOPs pretreatment system, and the AOPs pretreatment system uses a UV oxidation reactor, in which the wavelength of the ultraviolet lamp is 150nm, and the number of ultraviolet lamps in the equipment is 2. The temperature of the UV reactor is maintained at 80°C, and the reaction time is 60 minutes. The oxidant is fed in a ratio of 3 times the COD value in the wastewater. The oxidant is ozone, and...

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Abstract

The invention discloses a high-salt-content organic waste water treatment system and method. The system comprises an AOPS pretreatment system, an FO concentration system, a concentration crystallization system and a coarse salt washing system, wherein high-salt-content organic waste water is subjected to heat exchange through the AOPs pretreatment system and then enters the FO concentration system; refined brine passing or electrolyzed light salt brine enters the concentration crystallization system after being subjected to concentration through communicating FO device; the waste water passingthrough the concentration crystallization system is used for obtaining crystal salt and condensed water; a condensed water biochemical treatment system microbial treatment pool treats organic matters; outlet water is reused; the crystal salt entering the coarse salt washing system sequentially enters the two stages of communicated washing chambers to be dissolved and purified; refined saturated table salt water is used for flushing the crystal salts; the obtained pure crystal salts are reused. The zero discharge of the high-salt-content organic waste water can be realized, so that the water resource and salt resources are efficiently utilized.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a high-salt organic wastewater treatment system and method. Background technique [0002] In addition to organic pollutants, high-salt organic wastewater also contains a large amount of soluble salts, such as Cl - 、Na + , SO 4 2- , Ca 2+ Wait. This type of wastewater has poor biodegradability and is difficult to be directly treated by microbial methods. [0003] At present, some enterprises use reverse osmosis and other membrane separation technologies to concentrate and desalt high-salt organic wastewater, but the suspended solids and organic matter in the wastewater can pollute and easily block the membrane material, reduce the separation effect of the membrane, and even shorten the service life of the membrane. Therefore, the wastewater needs to be pre-treated before entering the reverse osmosis membrane separation device. The reverse osmosis membrane sepa...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/30
CPCC02F1/04C02F1/048C02F1/32C02F1/44C02F1/46104C02F1/72C02F3/00C02F3/34C02F9/00C02F2101/30C02F2301/08
Inventor 张宇刘凯熊磊慕毅刘国强史彦勇刘延财陈鹏宁小钢袁丽华高世军
Owner SHAANXI BEIYUAN CHEM GROUP
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