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A pretreatment process for desulfurization and purification of gas extraction wastewater

A gas extraction wastewater and pretreatment technology, applied in multi-stage water treatment, water/sewage treatment, flotation water/sewage treatment, etc., can solve the problems of inability to achieve resource reuse, heavy workload, high cost, etc., and achieve water discharge The effect of good water quality, reduced dosage and simple process

Active Publication Date: 2021-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The continuous reduction of reinjection capacity and the high cost of reinjection limit the development of the first treatment method; although the cost of the second treatment method is lower than that of the reinjection method, due to the high sulfur content, high salinity, and high Hardness and high organic matter, it will take a lot of cost to treat it up to the standard, and it cannot achieve resource reuse; the third method has a large workload and high cost, and it needs to be processed centrally after transportation

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  • A pretreatment process for desulfurization and purification of gas extraction wastewater

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Effect test

Embodiment 1

[0045] Gas production wastewater from a gas field, the water quality is: pH 7.2, H 2 S is 5000mg / L, COD is 1530mg / L, total nitrogen is 80mg / L, and total hardness is 2560mg / L.

[0046] The waste water from gas extraction enters the stripping tower, the temperature of the bottom of the stripping tower is 160°C, the temperature of the top of the stripping tower is 105°C, and the pressure of the stripping tower is 0.6MPa. After desulfurization by the stripper, the H in the wastewater 2 The S content was reduced from 5000mg / L to 105mg / L. The steamed water enters the water storage tank, and is pumped into the nano-scale oxidation desulfurization air flotation unit through the pipeline. 27% hydrogen peroxide 590 mg / L is added to the pipeline, and hydrochloric acid is added to adjust the pH value to 5. The reaction time is about 5 minutes. H in water 2 The S content dropped to 25mg / L. Dosing NaHCO before the oxidized effluent enters the anoxic biochemical pool 3 Adjust the pH of ...

Embodiment 2

[0050] Gas production wastewater from a gas field, the water quality is: pH 8.3, H 2 S is 3370mg / L, COD is 2235mg / L, total nitrogen is 150mg / L, and total hardness is 3580mg / L.

[0051] The waste water from gas extraction enters the stripping tower, the temperature of the bottom of the stripping tower is 140°C, the temperature of the top of the stripping tower is 95°C, and the pressure of the stripping tower is 0.4MPa. After desulfurization by the stripper, the H in the wastewater 2 The S content dropped from 3370mg / L to 95mg / L. The steamed water enters the water storage tank, and is pumped into the nano-scale oxidation desulfurization air flotation unit through the pipeline. 27% hydrogen peroxide 388mg / L is added to the pipeline, and hydrochloric acid is added to adjust the pH value to 6. The reaction time is about 20min. H in water 2 The S content dropped to 25mg / L. Dosing NaHCO before the oxidized effluent enters the anoxic biochemical pool 3 Adjust the pH of the oxidiz...

Embodiment 3

[0055] Gas production wastewater from a gas field, the water quality is: pH 8.0, H 2 S is 3520mg / L, COD is 1920mg / L, total nitrogen is 106mg / L, and total hardness is 1780mg / L.

[0056] The waste water from gas extraction enters the stripping tower, the temperature of the bottom of the stripping tower is 110°C, the temperature of the top of the stripping tower is 85°C, and the pressure of the stripping tower is 0.15MPa. After desulfurization by the stripper, the H in the wastewater 2 The S content dropped from 3520mg / L to 82mg / L. The steamed water enters the water storage tank, and is pumped into the nano-scale oxidation desulfurization air flotation unit through the pipeline. 30% sodium hypochlorite 237mg / L is added to the pipeline, and sulfuric acid is added to adjust the pH value to 4.5. The reaction time is about 15min. H in water 2 The S content dropped to 20mg / L. Before the oxidized effluent enters the anoxic biochemical pool, add NaOH to adjust the pH of the oxidized...

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Abstract

The invention relates to a pretreatment process for desulfurization and purification of gas extraction wastewater. More specifically, it includes the pretreatment process of the three-step treatment unit of sulfur removal, organic matter removal and total nitrogen removal, and hardness removal, to provide qualified raw water for further advanced treatment. The pretreatment process flow of the present invention includes stripping and desulfurization to remove most of the H in the gas production wastewater 2 S, and then remove the remaining H in the gas extraction wastewater through the nano-scale oxidation desulfurization air flotation unit 2 S, and then go through the "anoxic-aerobic-MBR membrane" biochemical treatment process to remove organic matter and total nitrogen in the gas extraction wastewater, and then remove the scaling substances in the gas extraction wastewater through the microfiltration hard removal unit. The present invention is a pretreatment process for advanced treatment of gas extraction wastewater. The process is simple and effective. It can remove sulfur, suspended matter, organic matter, total nitrogen and hardness in the gas extraction wastewater in a targeted manner, and provide qualified water source. It has very broad application prospects in the treatment of high-sulfur, high-COD, and high-hardness wastewater.

Description

technical field [0001] The invention relates to a pretreatment process for desulfurization and purification of gas extraction wastewater, more specifically a pretreatment process comprising three-step treatment units of sulfur removal, organic matter and total nitrogen removal, and hardness removal, to provide qualified raw water for further advanced treatment. Background technique [0002] With the scale of natural gas development, production capacity continues to increase, and the produced water also increases. Produced water is formation water with high salinity produced during natural gas development, and the water quality and quantity of gas production water vary greatly with different gas wells and extremes of gas production. At present, there are three main ways to treat gas production wastewater in gas fields: the first way is to transport it to the oilfield sewage treatment station through pipelines for treatment and reinjection, or select an abandoned well nearby f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/10
CPCC02F1/048C02F1/24C02F1/444C02F1/52C02F1/66C02F1/722C02F3/30C02F9/00C02F2101/101C02F2301/08
Inventor 赵辉邱小云龚小芝常田
Owner CHINA PETROLEUM & CHEM CORP
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