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Treatment method for waste water containing high content calcium and organic matter

A treatment method and wastewater treatment technology, applied in water/sewage treatment, sustainable biological treatment, neutralized water/sewage treatment, etc., can solve the problems of poor practicability, large equipment investment, high operating costs, and achieve a small footprint. , The effect of dealing with high organic matter load and high decalcification and iron removal efficiency

Active Publication Date: 2006-11-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is only suitable for oil production wastewater with a calcium and magnesium ion concentration of about 70mg / L, and is not suitable for the removal of calcium ions in high-concentration electric desalination wastewater, and the equipment investment is large, the operating cost is high, and the practicability is poor

Method used

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  • Treatment method for waste water containing high content calcium and organic matter

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Effect test

Embodiment 1

[0019] High concentration wastewater (COD cr The value is 12000mg / L, the calcium content is 5000mg / L, and the iron content is 250mg / L), after oil separation treatment, it is pumped into the anaerobic reactor (EIC), the operating temperature is 30°C, the hydraulic retention time is 32h, COD Volume load 7.2KgCOD / m 3 .d, adjust the pH of the anaerobic effluent to 7, then add 25mg / L decalcification and deiron softening agent for softening treatment (the softening agent consists of 5% by weight sodium polyacrylate, 85% by weight of aluminum sulfate, 10% by weight of peroxide Hydrogen), the sedimentation effluent is sent to the biological aerated filter for aerobic treatment, in which the hydraulic retention time of the primary biological aerated filter is 6.5h, and the COD volume load is 4.8KgCOD / m 3 .d, the hydraulic retention time of the secondary biological aerated filter is 6.5h, and the COD volume load is 2.9KgCOD / m 3 .d. Final effluent quality: COD cr The calcium content ...

Embodiment 2

[0021] High-concentration wastewater (COD value is 20000mg / L, calcium content is 4000mg / L, iron content is 100mg / L), after oil separation treatment, it is pumped into the decalcification and iron softening tank for softening treatment, and the pH of the effluent is adjusted to 8. Add 15mg / L decalcification and iron removal softener (the softener consists of 50% by weight diallylamine chloride / acrylamide copolymer, 50% by weight ferric chloride), and after sedimentation, the supernatant is sent to the anaerobic In the oxygen reactor (EIC), the operating temperature is 35°C, the hydraulic retention time is 20h, and the COD volume load is 12KgCOD / m 3 .d, the anaerobic effluent is sent to the biological aerated filter for aerobic treatment, in which the hydraulic retention time of the primary biological aerated filter is 6.5h, and the COD volume load is 8KgCOD / m 3 .d, the hydraulic retention time of the secondary biological aerated filter is 6.5h, and the COD volume load is 4.8KgC...

Embodiment 3

[0023] High-concentration wastewater (COD value is 20000mg / L, calcium content is 4000mg / L, iron content is 150mg / L), after oil separation treatment, it is pumped into the decalcification and iron softening tank for softening treatment, and the pH of the effluent is adjusted to 8. Add 5mg / L decalcification and deferrification softener (the softener consists of 90% by weight polydimethyldiallyl ammonium chloride, 5% by weight ferric chloride, 5% by weight potassium permanganate), and put The supernatant is sent to the anaerobic reactor (EIC), the operating temperature is 40°C, the hydraulic retention time is 32h, and the COD volume load is 18KgCOD / m 3 .d, the anaerobic effluent is sent to the biological aerated filter for aerobic treatment, in which the hydraulic retention time of the primary biological aerated filter is 4h, and the COD volume load is 6KgCOD / m 3 .d, the hydraulic retention time of the secondary biological aerated filter is 4h, and the COD volume load is 4KgCOD / m...

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Abstract

This invention provides a method for treating sewage containing high concentration of calcium and organic compounds, comprising the following procedures: (1) remove the floating oil of the sewage through the regulating tank and oil separating tank and then send to the anaerobic reactor for treatment; (2)adjust the pH value of the anaerobic outlet water to 6-9, and then add in decalcifying and desferri softening agent for settling separation; (3)send the softened outlet water to the second-stage aeration biological filtration tank to decrease the COD to the required value. This method is characterized of a high organic compound treatment load, a high decalcifying and desferri efficiency and a small need for land area, Besides, it can decrease the CODcr concentration, calcium concentration, iron concentration of the original sewage from 10000-20000mg / L, 500-6000mg / L and 0-500mg / L respectively to below 800mg / L, 200mg / L and 10mg / L, respectively.

Description

technical field [0001] The invention relates to a method for treating waste water with high calcium content and high organic matter content, in particular to a method for treating high-concentration electric desalination waste water in oil refineries. Background technique [0002] Crude oil contains different amounts of salt and impurities, which have varying degrees of impact on the deep processing of crude oil and product quality, so desalination and decalcification must be performed on crude oil. The current crude oil desalination and decalcification method is to inject crude oil water, decalcifying agent and crude oil through a mixer to fully mix, and then under the action of temperature, electric field and demulsifier, destroy the oil-water emulsion, make the water phase coalesce, and realize oil-water separation. Remove salt from water. The important feature of this kind of electric desalination wastewater is that the water volume is small, accounting for about 2% to ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/40C02F1/62C02F1/66C02F3/02C02F3/28C02F5/02
CPCY02W10/10
Inventor 李本高秦冰桑军强
Owner CHINA PETROLEUM & CHEM CORP
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