Method for treating ammonium salt containing wastewater

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

Active Publication Date: 2019-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

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  • Method for treating ammonium salt containing wastewater
  • Method for treating ammonium salt containing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0129] Such as figure 1 As shown, the wastewater containing ammonium salt (containing NaCl 130g / L, Na 2 SO 4 26g / L, NH 4 Cl 40g / L, (NH 4 ) 2 SO 4 8.1g / L, pH 6.5) with 5.859m 3 The speed of / h is sent into the pipeline of the treatment 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, by the first pH value measuring device 61 (pH meter) after adjusting The pH value is monitored (the measured value is 9.0); wherein, a part of the waste water containing ammonium salt is passed through the first circulation pump 71 at 5.0m 3 The speed of / h mixes with the second mother liquor that the ninth circulating pump 79 returns to obtain waste water to be treated (wherein Cl - The concentration of SO is 3.737mol / L, SO 4 2- The concentration is 0.197mol / L, Cl - / SO 4 2- The molar ratio is 18.97), and then a part of the waste water to be treated is sent to the fir...

Embodiment 2

[0137] According to the method of embodiment 1, carry out the treatment containing ammonium salt waste water, difference is: to containing NaCl 68g / L, NaCl 2 SO 4 68g / L, NH 4 Cl 25g / L, (NH 4 ) 2 SO 4 25.4g / L, pH 6.3 wastewater containing ammonium salts, the feed volume is 6.84m 3 / h; part of the waste water in 5.0m 3 Cl - and SO 4 2- The molar ratio is 10.848; The concentration of NaCl in the wastewater to be treated obtained by mixing the rest of the ammonium-containing salt wastewater with the first mother liquor in the first mother liquor tank 53 is 237.85g / L, NaCl 2 SO 4 The concentration is 71.39g / L.

[0138] The evaporation temperature is 100°C, the pressure is -22.83kPa, and the evaporation volume is 5.530m 3 / h; the temperature of cooling treatment is 20°C, and the time is 65min; the temperature of cooling and crystallization is 0°C, and the time is 120min.

[0139] The first solid-liquid separation device 91 obtains water content per hour and is 755.64 kg...

Embodiment 3

[0143] Carry out the treatment of waste water containing ammonium salt according to the method of embodiment 1, difference is: to containing NaCl 50g / L, NaCl 2 SO 4 100g / L, NH 4 Cl 21g / L, (NH 4 ) 2 SO 4 42.69g / L, pH 6.7 wastewater containing ammonium salt, the feed amount is 9.39m 3 / h; part of the wastewater containing ammonium salt in 5.0m 3 Cl - and SO 4 2- The molar ratio is 11.640; The concentration of NaCl in the wastewater to be treated obtained by mixing the rest of the ammonium-containing salt wastewater with the first mother liquor in the first mother liquor tank 53 is 224.49g / L, NaCl 2 SO 4 The concentration is 62.84g / L. The temperature of the wastewater to be treated after heat exchange by the second heat exchange device 32 is 105°C.

[0144] The evaporation temperature is 110°C, the pressure is 11.34kPa, and the evaporation volume is 5.999m 3 / h; the temperature of cooling treatment is 25°C, and the time is 60min; the temperature of cooling and crysta...

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Abstract

The invention relates to the field of sewage treatment, and discloses a method for treating ammonium salt containing wastewater. The ammonium salt containing wastewater contains NH4+, SO42-, Cl- and Na+. The method comprises the following steps: 1) subjecting to-be-treated wastewater to evaporation so as to obtain ammonia-containing vapor and a concentrated liquid containing sodium chloride crystals, wherein the to-be-treated wastewater contains the ammonium salt containing wastewater; 2) subjecting the concentrated liquid containing the sodium chloride crystals to first solid and liquid separation, and subjecting a liquid phase obtained by first solid and liquid separation to cooling and crystallization so as to obtain a crystallized liquid containing sodium sulfate crystals; and 3) subjecting the crystallized liquid containing the sodium sulfate crystals to secondary solid and liquid separation. The method provided by the invention can separately recover ammonium, sodium sulfate andsodium chloride in the wastewater, and reutilizes resources in the wastewater to a greatest extent.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a treatment method for wastewater containing ammonium salts, in particular to a method for treating wastewater containing NH 4 + , SO 4 2- , Cl - and Na + The treatment method of wastewater containing ammonium salt. Background technique [0002] In the production process of oil refining catalyst, a large amount of inorganic acid-base salts such as sodium hydroxide, hydrochloric acid, sulfuric acid, ammonium salt, sulfate, hydrochloride, etc. are required, and a large amount of ammonium, sodium sulfate, sodium chloride and aluminosilicate are produced Salt mixed sewage. For such sewage, the usual practice in the prior art is to first adjust the pH value to the range of 6-9, remove most of the suspended solids, and then use biochemical methods, stripping methods or stripping methods to remove ammonium ions. In addition, after adjusting the pH value of the salty sewage, removi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01C1/02C01D3/04C01D5/00C02F101/10C02F101/12C02F101/16C02F103/34
CPCC01C1/022C01D3/04C01D5/00C02F9/00C02F2301/08C02F2103/34C02F1/66C02F1/048C02F2001/5218C02F2101/16C02F2101/12C02F2101/101C02F2101/10
Inventor 殷喜平李叶顾松园陈玉华刘志坚安涛伊红亮
Owner CHINA PETROLEUM & CHEM CORP
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