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Catalyst production wastewater treatment method

A technology for the production of waste water and treatment methods, applied in multi-stage water treatment, water/sewage treatment, natural water body treatment, etc., can solve the problems of high cost and low cost of waste water treatment, and only mixed salt crystals can be obtained.

Active Publication Date: 2018-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the invention is to overcome the NH-containing 4 + , SO 4 2- , Cl - and Na + The high cost of wastewater treatment and the problem that only mixed salt crystals can be obtained provide a low-cost and environmentally friendly NH-containing 4 + , SO 4 2- , Cl - and Na + Catalyst production wastewater treatment method, which can recover ammonium, sodium chloride, and sodium sulfate in wastewater, and reuse resources in wastewater to the greatest extent

Method used

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  • Catalyst production wastewater treatment method

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Effect test

Embodiment 1

[0123] like figure 1 As shown, the catalyst production wastewater (containing NaCl 180g / L, Na 2 SO 4 10g / L, NH 4 Cl48g / L, (NH 4 ) 2 SO 4 2.71g / L, pH is 6.4) by the first circulation pump 71 with feed rate is 5m 3 The speed of / h is sent into the pipeline of the processing system, and the sodium hydroxide aqueous solution that imports concentration is 45.16 mass % in the pipeline is carried out the pH value adjustment for the first time, and adjusts by the first pH value measuring device 61 (pH meter) After the pH value is monitored (measured value is 7.6), a part (4.5m 3 / h) sent to the first heat exchange device 31 (plastic plate heat exchanger) for the first heat exchange with the recovered first ammonia water to raise the temperature of the catalyst production wastewater to 43 °C, and the rest was sent to the fourth heat exchange device 34 (double stainless steel plate heat exchanger) and the recovered second ammonia water for the first heat exchange to raise the t...

Embodiment 2

[0131] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl176g / L, NaCl176g / L, Na 2 SO 4 20g / L, NH 4 Cl 34.6g / L, (NH 4 ) 2 SO 4 4.0g / L, pH 6.9 catalyst production wastewater for treatment, part of which (5.0m 3 / h) The temperature of the catalyst production wastewater after heat exchange by the first heat exchange device 31 is 48°C, and the temperature of the rest of the catalyst production wastewater after heat exchange by the fourth heat exchange device 34 is 98°C. The temperature of the waste water to be treated after heat exchange in the device 32 is 57°C, and the SO contained in the obtained waste water to be treated 4 2- and Cl - The molar ratio is 1:15.307. The evaporation temperature of MVR evaporation device 2 is 50°C, the pressure is -92.7kPa, and the evaporation volume is 5.06m 3 / h. The evaporation temperature of the first effect evaporator 1a is 70°C, the pressure is -78....

Embodiment 3

[0136] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl98g / L, NaCl98g / L, Na 2 SO 4 102g / L, NH 4 Cl 20g / L, (NH 4 ) 2 SO 4 21.16g / L, pH 6.7 catalyst production wastewater for treatment, part of which (3.0m 3 / h) The temperature of the catalyst production wastewater after heat exchange by the first heat exchange device 31 is 54°C, and the temperature of the rest of the catalyst production wastewater after heat exchange by the fourth heat exchange device 34 is 99°C. The temperature of the waste water to be treated after heat exchange in the device 32 is 62°C, and the SO contained in the obtained waste water to be treated 4 2- and Cl - The molar ratio is 1:11.779. The evaporation temperature of MVR evaporation device 2 is 55°C, the pressure is -90.15kPa, and the evaporation volume is 3.52m 3 / h. The evaporation temperature of the first effect evaporator 1a is 70°C, the pressure is -78....

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Abstract

The invention relates to the field of wastewater treatment and discloses a catalyst production wastewater treatment method. The wastewater contains NH4<+>, SO4<2->, Cl<-> and Na<+>. The method comprises the following steps: 1) sending wastewater to be treated into an MVR evaporation device to be primarily evaporated to obtain first steam containing ammonia and first concentrated liquor containingsodium chloride crystal, wherein the wastewater to be treated contains the catalyst production wastewater; 2) performing first solid-liquid separation on the first concentrated liquor containing the sodium chloride crystal, sequentially sending a liquid phase obtained in the first solid-liquid separation into all effect evaporators of a multi-effect evaporation device to be secondarily evaporated,respectively obtaining second steam containing ammonia in the all effect evaporators and further obtaining second concentrated liquor containing sodium sulfate crystal in the last one effect evaporator; 3) performing second solid-liquid separation on the second concentrated liquor containing the sodium sulfate crystal. The method can be used for respectively recycling ammonia, sodium sulfate andsodium chloride in the wastewater, and resources in the wastewater can be reutilized to the maximum extent.

Description

Technical field [0001] The present invention relates to the field of sewage treatment, specifically to a method for treating catalyst production wastewater, and in particular to a method for treating NH-containing wastewater. 4 + ,SO 4 2- ,Cl - and Na + Methods for treating wastewater from catalyst production. Background technique [0002] In the production process of oil refining catalysts, a large amount of inorganic acid and alkali salts such as sodium hydroxide, hydrochloric acid, sulfuric acid, ammonium salts, sulfates, and hydrochlorides are required, resulting in a large amount of ammonium, sodium chloride, sodium sulfate, and aluminosilicate. Salt mixed with sewage. For such sewage, the common practice in the prior art is to first adjust the pH value to the range of 6 to 9, remove most of the suspended solids, and then use biochemical methods, stripping methods or stripping methods to remove ammonium ions. Then, after adjusting the pH value, removing most of t...

Claims

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Application Information

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IPC IPC(8): C02F1/04C01D3/04C01D5/00C01C1/02C02F101/10C02F101/12C02F101/16C02F103/34
CPCC01C1/022C01D3/04C01D5/00C02F1/048C02F2101/101C02F2209/06C02F2301/08C02F2101/16C02F2101/12C02F2103/34Y02A20/131
Inventor 殷喜平李叶苑志伟周岩杨凌刘夫足高晋爱安涛吕伟娇顾松园王涛
Owner CHINA PETROLEUM & CHEM CORP