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A kind of sour natural gas mining wastewater treatment method
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A technology for mining sewage and treatment methods, applied in mining wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. High and wide range of effects
Active Publication Date: 2021-04-09
自贡市轻工业设计研究院有限责任公司 +1
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[0004] In the existing technology, the treatment of natural gas mining sewage is mainly the desalination process of "pretreatment + multi-effect evaporation" sulfur-containing gas field, but the cost of this technology is high, and the solid waste generated during the treatment process, such as sludge, mother liquor, etc. treatment; and the refractory chemical additives such as foaming agents, corrosion inhibitors, and scale inhibitors in the mining sewage are not treated, which will pollute the environment after discharge
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Embodiment 1
[0050] Such as figure 1 As shown in Table 4, take the sulfur-containing natural gas mining sewage whose main components are shown in Table 4 as raw water, add NaOH and Na 2 CO 3 Remove solid waste such as calcium and magnesium, adjust the pH to 11.23, and use a high-pressure pump to control the pressure at 6MPa to pressurize into the DTRO system. The DTRO permeate enters the low-pressure RO system for further desalination. The DTRO concentrate is collected for use, and pumped into the 500L evaporation device. The DTRO concentrated liquid is concentrated by vacuum evaporation, and the boiling point is controlled above 45°C, and the condensed water is collected. When the volume of the concentrated feed liquid is concentrated to 90L, the 90L concentrated feed liquid is transferred to a 100L evaporator to continue vacuum evaporation and concentration, and the boiling point is controlled above 45°C. Concentrate until the salt crystals are precipitated, and dehydrate and dry the sa...
Embodiment 2
[0052] Such as figure 1 As shown in Table 4, take the sulfur-containing natural gas mining sewage whose main components are shown in Table 4 as raw water, add NaOH and Na 2 CO 3 Remove solid waste such as calcium and magnesium, adjust the pH to 11.35, and use a high-pressure pump to control the pressure at 6MPa to pressurize into the DTRO system. The DTRO permeate enters the low-pressure RO system for further desalination. The DTRO concentrate is collected for use, and pumped into the 500L evaporation device. Concentrated liquid, vacuum evaporation and concentration, control the boiling point above 85°C, collect condensed water, when the volume of the concentrated feed liquid is concentrated to 90L, transfer 90L of concentrated feed liquid to a 100L evaporator to continue vacuum evaporation and concentration, control the boiling point above 85°C, concentrate until Salt crystals are precipitated, and the salt slurry is dehydrated and dried. Evaporate the mother liquor to adju...
Embodiment 3
[0054] Such as figure 1 As shown in Table 4, take the sulfur-containing natural gas mining sewage whose main components are shown in Table 4 as raw water, add NaOH and Na 2 CO 3 Remove solid waste such as calcium and magnesium, adjust the pH to 11.23, use a high-pressure pump to control the pressure of 7MPa to pressurize into the DTRO system, and the DTRO permeate will enter the low-pressure RO system for further desalination. Concentrate, vacuum evaporation and concentration, control the boiling point above 45°C, collect condensed water, when the volume of the concentrated feed liquid is concentrated to 90L, transfer 90L of concentrated feed liquid to a 100L evaporator to continue vacuum evaporation and concentration, control the boiling point above 45°C, concentrate until Precipitate salt crystals, dehydrate and dry the salt slurry to obtain salt products. Evaporate the mother liquor to adjust the pH value to 3, and use micro-electrolysis to catalyze the oxidation reaction...
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Abstract
The invention discloses a method for treating sulfur-containing natural gas mining sewage, which comprises the following steps: after pre-treating the sulfur-containing natural gas mining sewage from a raw water tank, entering a high-pressure membrane concentration unit for membrane concentration to obtain concentrated liquid and permeated liquid, Evaporate and concentrate the obtained concentrated solution to obtain condensed water, mother liquor, and salt slurry, centrifuge and dehydrate the obtained salt slurry, and dry to obtain the salt product; the obtained condensed water is removed from organic matter and ammonia nitrogen in the MBR, and then combined with the obtained The liquid enters the low-pressure membrane concentration unit together for membrane concentration to obtain concentrated water and fresh water; the concentrated water returns to the high-pressure membrane concentration unit for further processing, and the fresh water is reused as production water for natural gas exploitation; the obtained mother liquor is subjected to micro-electrolytic catalytic oxidation and then returned to raw water Can. The ammonia nitrogen content in the fresh water obtained after low-pressure concentration of the present invention is less than 10mg / L, can be used as supplementary water in natural gas purification or production process, and realizes zero discharge of natural gas exploitation sewage.
Description
technical field [0001] The invention relates to the field of sewage treatment in environmental protection technology, in particular to a natural gas mining sewage treatment technology. Background technique [0002] Natural gas is a clean, efficient and cheap gaseous energy and chemical raw material. It has a wide range of uses and can replace oil and coal resources in many fields. The underground reserves of natural gas are quite abundant, and it is one of the strategic energy sources that can be relied on for a long time in the future. At present, the global natural gas exploration and development technology, large-scale storage and transportation technology and downstream application technology are developing rapidly. In addition, the limited oil and coal resources are in contradiction with the high growth of demand. The high standard requirements of the natural environment and the use of oil and coal resources The high pollution is contradictory, making the strategic pos...
Claims
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Application Information
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