Treatment device and process for high nitrate wastewater

A treatment device, nitrate technology, applied in the direction of return water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. Environmental and social benefits, good industrial application prospects, and the effect of reducing energy consumption

Active Publication Date: 2021-10-22
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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  • Treatment device and process for high nitrate wastewater

Examples

Experimental program
Comparison scheme
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 waste water treatment process, in particular to a high nitrate waste water treatment device and a process thereof. In the device, the raw water input pipeline is sequentially connected to the nitric acid steam heat exchanger, tail gas heat exchanger, condensed water heat exchanger, and MVR evaporator; the MVR exhaust port of the MVR evaporator is connected to the tail gas absorbent tank, and the tail gas absorbent tank It is connected to the tail gas absorption tower, and the exhaust port on the top 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 of the nitric acid recovery device, and the concentrated liquid outlet of the nitric acid recovery device is connected to the crystallizer. The outlet of nitric acid steam on the top of the nitric acid recovery unit 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 the concentrated nitric acid tank; the condensed water outlet of the MVR evaporator is connected to the heat source inlet of the condensed water heat exchanger . After the raw water is treated by the device and process of the invention, the effluent can be recycled, and the crystallization and tail gas can be 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 Patents(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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