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Treatment process for hydrazine hydrate wastewater

A technology for wastewater treatment and hydrazine hydrate, which is applied in water/sewage treatment, degassed water/sewage treatment, oxidized water/sewage treatment, etc. The problem of large amount of addition, to achieve the effect of simplifying the process, reducing the concentration of pollution, and long service life

Pending Publication Date: 2021-01-08
NANJING GREEN ISLAND ENVIRONMENTAL ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] "Study on Resin Adsorption Process for Treatment of Hydrazine Hydrate Wastewater" (Dissertation of Tianjin University of Technology, 2019) adopts the process of resin adsorption, nanofiltration membrane separation, and hydrogen peroxide oxidation to treat hydrazine hydrate production wastewater, and the effluent can be reused as ionic membrane electrolysis Water, but there are problems that the nanofiltration membrane is easily polluted and the dosage of hydrogen peroxide is too large
[0005] At present, most of the hydrazine hydrate wastewater treatment process adopts the method of adding oxidant for oxidation, and the dosage of oxidant is extremely large.

Method used

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  • Treatment process for hydrazine hydrate wastewater
  • Treatment process for hydrazine hydrate wastewater
  • Treatment process for hydrazine hydrate wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: collecting hydrazine hydrate wastewater;

[0039] Step 2: send the collected raw water of hydrazine hydrate wastewater into the evaporation system for evaporation, and collect the evaporation condensate; the salt evaporates and crystallizes, and is packaged and recovered after centrifugation;

[0040] Step 3: discharge the condensate produced by evaporation into the catalytic reaction tank, add copper sulfate and aerate, the concentration of copper sulfate in the catalytic reaction tank is controlled at 0.4mmol / L, the pH is controlled between 6 and 9, and the residence time of wastewater is 40h;

[0041] Step 4: The effluent from the catalytic reaction tank passes through the multi-media filter, ultrafiltration system, and reverse osmosis system in sequence. The flow rate of the multi-media filter is 10m / h. The reverse osmosis system is arranged in two stages. The ratio is 2:1, the concentrated water in the first stage returns to the front of the high-pressure p...

Embodiment 2

[0048] The hydrazine hydrate wastewater treatment process provided by the present embodiment is basically the same as in Example 1, the difference is that:

[0049]1. The raw water in this embodiment is the condensate after MVR evaporation;

[0050] 2. In this example, the wastewater produced by reverse osmosis has reached the first-class standard, and there is no need to add an oxidant to oxidize;

[0051] Specific steps are as follows:

[0052] Step 1: The raw water is discharged into the catalytic reaction tank, copper sulfate is added and aerated, the concentration of copper sulfate in the catalytic reaction tank is controlled at 0.2mmol / L, the pH is controlled between 6 and 9, and the wastewater residence time is 24h;

[0053] Step 2: The effluent from the catalytic reaction tank passes through the multi-media filter, ultrafiltration system, and reverse osmosis system in sequence. The flow rate of the multi-media filter is 10m / h. The reverse osmosis system is arranged in...

Embodiment 2

[0055] Embodiment 2 The effluent water quality of each main treatment unit is as follows:

[0056]

[0057] Comparing Example 1 and Example 2, it can be seen that when the CODcr and ammonia nitrogen indicators of the raw water are respectively 2400mg / L and 2300mg / L, the reverse osmosis effluent can reach the first-class standard. The CODcr and ammonia nitrogen indicators of the catalyzed reaction effluent in Examples 1 and 2 are significantly lower than those of the evaporated effluent, indicating that the copper salt has a good catalytic effect on the pollutants in the hydrazine hydrate wastewater.

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Abstract

The invention belongs to the field of sewage treatment, and particularly relates to a treatment process for hydrazine hydrate wastewater. The treatment process comprises the following steps: enablingwastewater to sequentially pass through a collection tank, an evaporation system, a catalytic reaction tank, a multi-medium filter, an ultrafiltration system, a reverse osmosis system and an oxidationtank, discharging or recycling the wastewater after the wastewater reaches the standard, enabling reverse osmosis concentrated water to pass through an ion exchange system to adsorb a catalyst and regenerate, and allowing catalyst-containing regenerated liquid to flow back to a catalytic reaction tank so as to realize cyclic utilization of the catalyst. On the premise that salt, CODcr and NH3-N in hydrazine hydrate wastewater are effectively removed and effluent meets first-grade standard requirements prescibed in Integrated Wastewater Discharge Standard (GB 8978-1996), the dosage of chemicals is greatly reduced.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a hydrazine hydrate wastewater treatment process. Background technique [0002] Hydrazine hydrate is an important raw material and intermediate of fine chemical products. It is used in many industries. Its synthesis methods mainly include Raschig method, urea method, ketazine method and hydrogen peroxide method. Nitrogen is the main method. The wastewater produced in the production process of hydrazine hydrate has the characteristics of high salt, high CODcr, high ammonia nitrogen, and difficult biodegradation. [0003] Chinese invention patent CN109179831A (disclosure date January 11, 2019) discloses a treatment method for high-salt wastewater from hydrazine produced by ketazine method. The method of coagulation, stripping, oxidation and evaporation can effectively reduce COD and Ammonia nitrogen content, but a large amount of alkali needs to be added during the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/16
CPCC02F9/00C02F2101/16C02F1/048C02F1/001C02F1/58C02F1/20C02F1/441C02F1/42C02F1/444C02F1/76C02F2303/04C02F2303/16
Inventor 李家祥曹磊李跃华江葱陈芯蕊
Owner NANJING GREEN ISLAND ENVIRONMENTAL ENG
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