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High-nitrate wastewater treatment apparatus and high-nitrate wastewater treatment process

A treatment device, nitrate technology, applied in the direction of return water treatment, water/sewage treatment, neutralization water/sewage treatment, etc., can solve the problem of high total nitrogen concentration in sewage, high salt content in waste water, large amount of carbon source dosage, etc. No secondary pollution, low operating cost, and reduced energy consumption

Active Publication Date: 2019-04-16
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. The salt content of wastewater is high, and direct biological treatment requires a large amount of water to be diluted, wasting resources
[0009] 2. The concentration of total nitrogen in the sewage is too high, and the biological denitrification treatment is used, the amount of carbon source is large, and the operating cost is high
[0010] 3. The evaporation crystallization process is adopted, because the nitrate is transferred to the crystallization, and the crystallization is hazardous waste, which is difficult to dispose of and expensive

Method used

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  • High-nitrate wastewater treatment apparatus and high-nitrate wastewater treatment process

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Effect test

Embodiment 1

[0046] A rare earth wastewater, water volume 100m 3 / h, the salt content is about 3%, the total nitrogen concentration is 4000mg / L, and the COD is 400mg / L.

[0047] a. After the pH of the raw water is adjusted to neutral, it is preheated by the nitric acid steam heat exchanger 2, tail gas heat exchanger 3, and condensed water heat exchanger 4, and then enters the MVR evaporator 5 for evaporation and concentration. The condensed water generated during the concentration process enters the condensation The water heat exchanger 4 preheats the raw water and enters the condensed water tank 11 for recovery to obtain condensed water of 90m 3 / h, COD35mg / L; The remaining concentrated solution enters the nitric acid recovery device 8, and in the nitric acid recovery device 8, adding concentrated sulfuric acid with a mass concentration of 98% reacts with the concentrated solution, controls the reaction temperature at 85.5 ± 0.5 ° C, and the reaction time is 15 minutes. In the process, t...

Embodiment 2

[0052] A rare earth wastewater, water volume 50m 3 / h, the salt content is about 6%, the total nitrogen concentration is 12000mg / L, and the COD is 300mg / L.

[0053] a. After the pH of the raw water is adjusted to neutral, it is preheated by the nitric acid steam heat exchanger 2, tail gas heat exchanger 3, and condensed water heat exchanger 4, and then enters the MVR evaporator 5 for evaporation and concentration. The condensed water generated during the concentration process enters the condensation The water heat exchanger 4 preheats the raw water and enters the condensed water tank 11 for recovery to obtain condensed water 44m 3 / h, COD10mg / L; The remaining concentrated solution enters the nitric acid recovery device 8, and in the nitric acid recovery device 8, adding concentrated sulfuric acid with a mass concentration of 90% reacts with the concentrated solution, controls the reaction temperature at 88 ± 1 ° C, and the reaction time is 60 minutes. In the process, the nitr...

Embodiment 3

[0058] A rare earth wastewater, water volume 60m 3 / h, the salt content is about 3%, the total nitrogen concentration is 8000mg / L, and the COD is 300mg / L.

[0059] a. After the pH of the raw water is adjusted to neutral, it is preheated by the nitric acid steam heat exchanger 2, tail gas heat exchanger 3, and condensed water heat exchanger 4, and then enters the MVR evaporator 5 for evaporation and concentration. The condensed water generated during the concentration process enters the condensation The water heat exchanger 4 preheats the raw water and enters the condensed water tank 11 for recovery to obtain condensed water of 54m 3 / h, COD30mg / L; The remaining concentrated solution enters the nitric acid recovery device 8, and in the nitric acid recovery device 8, adding concentrated sulfuric acid with a mass concentration of 93% reacts with the concentrated solution, controls the reaction temperature at 90 ± 1 ° C, and the reaction time is 30 minutes. In the process, the ni...

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Abstract

The invention relates to a wastewater treatment process, particularly to a high-nitrate wastewater treatment apparatus and a high-nitrate wastewater treatment process. According to the high-nitrate wastewater treatment apparatus, a raw water input pipeline is sequentially connected to a nitric acid steam heat exchanger, a tail gas heat exchanger, a condensed water heat exchanger and an MVR evaporator; the MVR gas discharge port of the MVR evaporator is connected to a tail gas absorbent tank, the tail gas absorbent tank is connected to a tail gas absorption tower, and the gas discharge port onthe top portion of the tail gas absorption tower is connected to the heat source inlet of the tail gas heat exchanger; the concentrated liquid outlet of the MVR evaporator is connected to the inlet ofa nitric acid recovery device, the concentrated liquid discharge port of the nitric acid recovery device is connected to a crystallizer, the nitric acid steam discharge port on the top portion of thenitric acid recovery device is connected to the heat source inlet of the nitric acid steam heat exchanger, and the heat source outlet of the nitric acid steam heat exchanger is connected to a concentrated nitric acid tank; and the condensed water outlet of the MVR evaporator is connected to the heat source inlet of the condensed water heat exchanger. According to the present invention, after theraw water is treated by the apparatus and the process, the effluent can be recycled, and the crystal and the tail gas are harmlessly treated.

Description

technical field [0001] The invention relates to a waste water treatment process, in particular to a high nitrate waste water treatment device and a process thereof. Background technique [0002] With the increasingly stringent sewage discharge standards, the sewage discharge indicators are becoming more and more stringent. The latest discharge standards require total nitrogen ≤ 30mg / L, COD ≤ 50mg / L. Strict sewage discharge standards have restricted the development of some chemical companies, such as some rare earth enterprises. Due to the large amount of nitric acid and ammonium salt used in the process, the sewage has high salt content, total nitrogen, and high ammonia nitrogen content. Before there is no total nitrogen discharge index requirement, the sewage is usually discharged directly as the hypothetical clean sewage after the ammonia liquid is recovered by the stripping process. Now this kind of high nitrate sewage must be treated separately to meet the new discharge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10B01D53/78B01D53/56C01B17/96C02F101/30
CPCB01D53/56B01D53/78B01D2251/2062B01D2251/2067B01D2257/404B01D2258/02C01B17/96C02F1/048C02F1/66C02F1/72C02F9/00C02F2001/5218C02F2101/30C02F2301/04
Inventor 梁明潘咸峰张广解红梅
Owner CHINA PETROLEUM & CHEM CORP
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