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Sodium sulfate wastewater treatment system

A treatment system, sodium sulfate technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, alkali metal sulfite/sulfate purification, etc., can solve the pungent and unpleasant smell of waste gas, the energy efficiency of coking wastewater Reduce pollution, air pollution and other problems, achieve resource utilization, realize economic benefits, and reduce equipment investment

Pending Publication Date: 2021-04-16
KUNSHAN MAYMUSE ENVIRONMENTAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, some methods are to mix sodium sulfate wastewater into coking wastewater AAO, that is, "anaerobic-anoxic-aerobic" process for treatment. As a result, the high salinity and high concentration of phenolic organic substances in the wastewater cause microbial poisoning, which reduces the bacterial activity. The energy efficiency of the system to treat ordinary coking wastewater is reduced
There are also methods to treat this kind of wastewater by catalytic oxidation, but the final treatment effect is still difficult to meet the environmental protection requirements.
In addition, in industrial production, there are also treatment methods for saline wastewater such as evaporation and crystallization recovery, membrane recovery, etc., but many problems have also been found in coal tar sodium sulfate wastewater. Air pollution, high impurity content of crystals, no market value and other defects; when membrane technology is applied, it is only suitable for the treatment of low-concentration sodium sulfate wastewater. The above methods are not only difficult to fully meet the requirements of environmental protection, but also cannot achieve coal tar. Realistic needs of resource utilization of deep-processing sodium sulfate wastewater

Method used

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  • Sodium sulfate wastewater treatment system

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) The degreasing device includes the following process steps:

[0039] Step 1, the sodium sulfate wastewater enters the first stirring tank of the air flotation device 101 to adjust the acid and control the pH to 3;

[0040] Step 2: Flow the waste water after air flotation into the inclined plate sedimentation tank 102 to remove the unsettled suspended solids, and then flow into the influent buffer tank 103 .

[0041] (2) The extracting and dephenolizing device comprises the following process steps:

[0042] Step 1, the sodium sulfate wastewater after precipitation and 20% extractant flow into the first stirred tank 202 through the first mixer 201 for forced mixing, the rotating speed is 50 rpm, and the extractant is selected from triisooctylamine;

[0043]Step 2, the mixed sodium sulfate wastewater and extractant enter the extraction tower 203 for oil-water separation, the extraction tower 203 packing height is 6 meters, the interface height is 1m, and the raffinate...

Embodiment 2

[0046] In Example 2, the step 1 in the extraction and dephenolization device was adjusted, and the extraction agent was adjusted to triisooctylamine, and the extraction agent was a combination of triisooctylamine and N,N-dioctylacetamide, and the ratio of the extraction agent was 15. %, others are consistent with Example 1.

[0047] After treatment, the phenol of sewage is 253ppm, COD4020mg / l, and the recovery rate of phenol is 93%.

Embodiment 3

[0049] In embodiment 3, adjustments were made to step 2 in the extraction and dephenolization device, the residence time of the first oil-water separator 204 and the second oil-water separator 205 were both adjusted to 120min, the ratio of the extractant was 10%, and the others were the same as in embodiment 1 be consistent.

[0050] After treatment, the phenol in the sewage is 444ppm, the COD is 4762mg / l, and the recovery rate of phenol is 91%.

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Abstract

The invention discloses a sodium sulfate wastewater treatment system. The treatment system comprises an oil removal device and an extraction dephenolization and phenol rectification device which are arranged in sequence, the oil removal device comprises an air floatation device, an inclined plate sedimentation tank and a water inlet buffer tank which are arranged in sequence. The sodium sulfate wastewater treatment system has the beneficial effects that tar in sodium sulfate wastewater is removed through the oil removal device, phenol in sewage is removed through extraction, phenol is separated from the extraction agent through rectification, and the extraction agent is recycled back to the system for use.

Description

technical field [0001] The invention relates to the technical field of coal chemical wastewater treatment, in particular to a treatment system for sodium sulfate wastewater. Background technique [0002] In the deep processing of coal tar, after the phenolic tar fraction is subjected to alkali washing-acid washing-alkali washing or acid washing-alkali washing process, the phenolic organic matter is separated in the form of phenol sodium salt, and then sent to crude phenol Refining process, in the refining process of crude phenol, the sodium phenol salt first completes degreasing, and then slowly reacts with sulfuric acid to decompose, thereby generating crude phenol, and through static separation, a large amount of sodium sulfate wastewater is produced. [0003] In addition to sodium sulfate and sulfuric acid, waste water also contains high concentrations of crude phenol and some waste oils, and its COD (chemical oxygen demand) is as high as hundreds of thousands of ppm on a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C07C37/72C07C37/74C01D5/16
Inventor 左卫雄刘雅妮焦庆生
Owner KUNSHAN MAYMUSE ENVIRONMENTAL TECH