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Treatment process of high-salinity concentrated water difficult to biodegrade

A technology that is difficult to biodegrade and treat. It is applied in the field of wastewater treatment, which can solve problems such as difficult to achieve, and achieve the effect of protecting the environment and realizing the utilization of water resources.

Inactive Publication Date: 2015-12-23
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in engineering applications, the above-mentioned single treatment technology is often difficult to reach the required standard

Method used

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  • Treatment process of high-salinity concentrated water difficult to biodegrade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using reverse osmosis to treat the refractory high-salt concentrated water produced by the wastewater treatment system of an oil refinery (discharge volume 100m 3 / hour) as an example, the specific water quality is shown in Table 1.

[0018] Table 1 concentrated water quality

[0019] indicators

[0020] Note: The control standard in the table is the indicator specified in the GB50335-2002 standard for reclaimed water used as supplementary water for circulating cooling water.

[0021] It can be seen from Table 1 that the BOD / COD (0.11) of the concentrated water produced by reverse osmosis is low, the hardness and alkalinity are higher than the water replenishment standard, and the water quality has the characteristics of high salt content and refractory biodegradation.

[0022] Such as figure 1 As shown, put 1L of the above-mentioned refractory high-salt concentrated water in the concentrated water tank, add 0.506g of calcium oxide and 0.236g of sodium carbo...

Embodiment 2

[0037] In Example 1, the amount of hydrogen peroxide added was changed to 28.5 mg (that is, 30 mg of hydrogen peroxide was added to each liter of cross-flow filtered effluent), and other process conditions were the same as in Example 1. The effluent quality is shown in Table 5.

[0038] Table 5 Effluent Water Quality

[0039] indicators

[0040] It can be seen from Table 5 that the COD of the treated effluent is reduced from 101 mg / L of raw water to 51 mg / L, and the removal rate is 49.5%; the chloride ion is reduced from 351 mg / L to 195.7 mg / L, and the removal rate is 44.2%; the hardness is reduced to 63.5 mg / L, the removal rate is 90.2%, the TDS removal rate is 54.7%, the effluent water quality has reached the circulating cooling water replenishment standard, and the concentrated water recycling rate can reach more than 95%.

Embodiment 3

[0042] In Example 1, the water quality of the concentrated water was changed (see Table 6 for the water quality of the concentrated water), and other process conditions were the same as in Example 1, and the water quality of the effluent was shown in Table 7.

[0043] Table 6 concentrated water quality

[0044] indicators

[0045] Table 7 Effluent Water Quality

[0046] indicators

[0047] It can be seen from Table 7 that the treated effluent COD decreased from 182 mg / L of raw water to 49.1 mg / L, with a removal rate of 73.0%; chloride ions decreased from 451 mg / L to 197.1 mg / L, with a removal rate of 56.3%; hardness decreased to 150.4 mg / L, the removal rate is 88%; the TDS removal rate is 63.8%, the effluent water quality has reached the circulating cooling water replenishment standard, and the concentrated water recovery rate can reach more than 95%.

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Abstract

The invention discloses a treatment process of high-salinity concentrated water difficult to biodegrade. According to a method, the high-salinity concentrated water difficult to biodegrade is treated through a combined process of dosing hardness removal, microfiltration and electrolysis, hardness, organic matters difficult to degrade and chlorine ions in waste water can be remarkably removed, the effluent quality meets the GB50335 standard about using of recycled water as circulating cooling water supplementary water, and the recycling rate of concentrated water can exceed 95 percent, so that the utilization of water resources is realized, and the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment process for reverse osmosis treatment of refractory high-salt concentrated water produced after drainage in a sewage treatment system of a petrochemical plant. Background technique [0002] Sewage produced by petrochemical enterprises that meets national discharge standards after treatment can be reused through reverse osmosis (RO) process, but 30% to 40% of high-salt concentrated water that is difficult to biodegrade will be produced in the RO process, mainly including higher The content of total dissolved solids (TDS) and refractory organic pollutants, such organic pollutants include organic matter with slow and incomplete decomposition by microorganisms, as well as metabolites of certain organic matter, such pollutants are chemically stable Good in nature, it exists in the environment for a long time, and can be enriched through the food ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/461C02F1/44
Inventor 孙玉鹏朱瑞龙张伟波陈武强
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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