Treatment method of high-salt content, high-ammonia nitrogen content and high-COD (Chemical Oxygen Demand) gas field water

A treatment method and technology for gas field water, which can be applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., which can solve the problem that membranes are easily polluted, the cost of treatment and operation increases, and the difficulty of ion exchange resins. And other issues

Active Publication Date: 2015-09-09
自贡市轻工业设计研究院有限责任公司
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Generally speaking, the membrane method and ion exchange method have a good treatment effect on the produced water of non-sulfur gas fields with relatively simple water quality. For the produced water of sulfur-containing gas fields, the membrane is easily polluted, and the ion excha

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  • Treatment method of high-salt content, high-ammonia nitrogen content and high-COD (Chemical Oxygen Demand) gas field water
  • Treatment method of high-salt content, high-ammonia nitrogen content and high-COD (Chemical Oxygen Demand) gas field water
  • Treatment method of high-salt content, high-ammonia nitrogen content and high-COD (Chemical Oxygen Demand) gas field water

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Experimental program
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Embodiment 1

[0040] refer to figure 1 As shown, the gas field water whose main components are shown in Table 4 is used as raw material, and NaOH and NaOH are added 2 CO 3Remove calcium and magnesium, adjust the pH to 11.53, pump 350L of calcium and magnesium clear liquid into the 500L evaporator, control the temperature of the evaporation material liquid at 101°C, stop evaporation when the condensed water reaches 35L, and drain the condensed water for a period of time. Vacuum evaporation and concentration, control the boiling point above 45°C, collect the condensed water in the second stage, when the volume of the concentrated feed liquid is concentrated to 100L, transfer 90L of the concentrated feed liquid to a 100L evaporator and continue to concentrate until the salt crystallizes, and the remaining 10L of the concentrated feed liquid is set aside. After the discharged salt slurry is washed and flotation with the remaining 10L of concentrated feed liquid, the mother liquor enters the el...

Embodiment 2

[0048] Using gas field water whose main components are shown in Table 7 as raw material, add NaOH and NaOH 2 CO 3 Remove calcium and magnesium, adjust the pH to 11.21, pump 350L of calcium and magnesium clear liquid into the 500L evaporator, control the temperature of the evaporation material liquid at 95°C, stop evaporation when the condensed water reaches 52L, and drain the condensed water for a period of time. Vacuum evaporation and concentration, control the boiling point to be above 45°C, collect the condensed water in the second stage, when the volume of the concentrated feed liquid is concentrated to 100L, transfer 90L of the concentrated feed liquid to a 100L evaporator and continue to concentrate until the salt crystallizes, and the remaining 10L of the concentrated feed liquid is for use . After the discharged salt slurry is washed and flotation with the remaining 10L of concentrated feed liquid, the mother liquor enters the electrolytic catalytic oxidation device t...

Embodiment 3

[0056] Using gas field water whose main components are shown in Table 10 as raw material, add NaOH and NaOH 2 CO 3 Remove calcium and magnesium, adjust the pH to 11.04, pump 350L of calcium and magnesium clear liquid into the 500L evaporator, control the temperature of the evaporation material liquid at 90°C, stop evaporation when the condensed water reaches 70L, and drain the condensed water for a period of time. Vacuum evaporation and concentration, control the boiling point to be above 45°C, collect the condensed water in the second stage, when the volume of the concentrated feed liquid is concentrated to 100L, transfer 90L of the concentrated feed liquid to a 100L evaporator and continue to concentrate until the salt crystallizes, and the remaining 10L of the concentrated feed liquid is for use . After the discharged salt slurry is washed and flotation with the remaining 10L of concentrated feed liquid, the mother liquor enters the electrolytic catalytic oxidation device ...

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Abstract

The invention discloses a treatment method of high-salt content, high-ammonia nitrogen content and high-COD (Chemical Oxygen Demand) gas field water and belongs to the field of wastewater treatment processes. The treatment method comprises the following steps of: firstly removing calcium, magnesium and suspended matters in the gas field water, and regulating the pH value to be above 10; then performing staged evaporation, namely adopting primary feeding batch operation for the first stage of evaporation; performing the second stage of evaporation on concentrated liquid, namely adopting vacuum evaporation for the second stage of evaporation; thickening salt slurry discharged in the second stage of evaporation, and then washing, dewatering and drying to obtain a salt product; performing electrolytic and catalytic oxidation on mother liquor discharged in the second stage of evaporation for removing COD, and returning the treated mother liquor as well as mother liquor obtained by thickening with the salt slurry to the gas field water for reuse, wherein the second stage of condensate water obtained in the second stage of evaporation is water reaching the standards, and after the first stage of condensate water obtained in the first stage of evaporation is treated, subjected to ammonia nitrogen removal and mixed with the second stage of condensate water, water reaching the standards is obtained. According to the treatment method disclosed by the invention, the problems of low possibility of removing salt, ammonia nitrogen and COD in the high-salt content, high-ammonia nitrogen content and high-COD sulfur-containing natural gas field produced water in the prior art can be solved.

Description

technical field [0001] The invention belongs to the field of sewage treatment technology, and in particular relates to the treatment of produced water from sulfur-containing natural gas fields with high salt content, high ammonia nitrogen content and COD. Background technique [0002] Due to the long-term coexistence with underground oil and gas reservoirs and rock formations, the produced water of natural gas fields is generally dissolved or mixed with a large amount of components such as petroleum, soluble salts, and suspended solids. In addition, in the process of gas production and gathering and transportation, it is often necessary to add chemical additives such as foaming agents, corrosion inhibitors, and scale inhibitors, which makes the composition of the produced water in natural gas fields more complex and varied, and shows high oil content, volatile It has the characteristics of high organic matter content, high suspended matter content and high mineralization deg...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/04C02F103/10
Inventor 蔡晓波符宇航彭传丰李波刘昌辉许景媛杨贡林赵国勇刘永刚牛翠英严戎北李靖刘平凡林国跃黄丽曾永健吴美霞夏珊
Owner 自贡市轻工业设计研究院有限责任公司
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