RU95657U1 - OIL-CONTAINING WATER TREATMENT - Google Patents

Abstract

 1. The construction of oil-containing wastewater treatment, including a drive-averager, a three-product hydrocyclone, an electrochemical filter, a sorption filter, a hydrophobic filter and sludge pits, characterized in that it additionally contains an electroflotator with a catalytic unit separated from the flotation chamber by a vertical partition, and the anode chamber located at the bottom of the electroflotator and is separated from the flotation chamber by a horizontal partition, and the output of the flotation chamber and the anode chamber is connected to the input of the catalytic sky block. ! 2. The structure according to claim 1, characterized in that the catalytic unit is loaded with granules of aluminum-manganese catalyst material of a fraction of 2-5 mm.

Description

The utility model relates to the field of wastewater treatment and can be used for wastewater treatment of petrochemical plants.

A structure is known comprising a hydrocyclone connected in series, a filter unit and an inclined sedimentation tank, a hydrocyclone with a filter-coalescing charge made of stainless metal shavings. The filter contains a housing with a coaxially located cylinder with a filter-coalescing load and a layer of fine-grained filter loading placed in the annular space between the housing and the cylinder (Patent RU No. 2158232).

The disadvantage of the construction is the insufficiently high effect of wastewater treatment from dissolved hardly oxidizable organic substances and surfactants.

There is a structure in which, during the process, primary filtering of the source water is carried out until the suspended solids are completely removed, electrochemical treatment of water, multi-stage sedimentation in the sedimentation module, repeated filtering of the water, final water purification, and also final sorption filtering (Patent RU No. 2219135).

The disadvantage of the construction is the insufficiently high effect of wastewater treatment from dissolved hardly oxidizable organic substances and surfactants.

The closest to the proposed facility in terms of technical nature and the achieved result is a facility for the treatment of oily wastewater, including sequential treatment by sludge in the averaging tank, then in a three-product hydrocyclone with the separation of oil concentrate and suspended solids concentrates, filtering in a filter loaded with polyurethane foam as polymer loading. Subsequent purification in the electrochemical filter is carried out by passing water from top to bottom through a mixture of granules of aluminum and iron, siliconized calcite as a mineral granular filter material, and AG-3 charcoal as a carbon-containing material. The final water purification is carried out in a sorption filter loaded with activated carbon (Patent RU No. 2156740).

The disadvantage of the construction is the insufficiently high effect of wastewater treatment from dissolved hardly oxidizable organic substances and surfactants.

The objective of the utility model is to increase the effect of wastewater treatment from synthetic surfactants and difficultly oxidized natural or technogenic organic substances.

The problem is solved in that the construction of oil-containing wastewater treatment, including averaging tank, three-product hydrocyclone, electrochemical filter, sorption filter, hydrophobic filter and sludge pads according to the utility model, contains an electroflotator with a catalytic unit separated from the flotation chamber by a vertical partition, and the anode chamber located at the bottom of the electroflotator and separated from the flotation chamber by a horizontal partition, the output of the flotation chamber and the anode chamber being connected with the entrance of the catalytic unit. The catalytic unit is loaded with granules of aluminum-manganese catalytic material AOK-75-41 fractions of 2-5 mm.

Figure 1 shows the flow chart of the purification of oily water, figure 2 - electroflotator with a catalytic unit.

The technological scheme includes a serially connected drive - averager 1, pump station 2, three-product hydrocyclone 3, electroflotator with a catalytic unit 4, electrochemical filter 5, sorption filter 6, clean water tank 7. The branch pipes for extracting oil products by hydrocyclone 3 and electroflotator 4 are connected to a hydrophobic filter 8, which in turn is connected to the oil storage 9.

The filter washing system 5 and 6 contains a washing pump 10 and a washing water settler 11. The sewage sludge is removed from the averaging tank 1, hydrocyclone 3, the washing water settler 11 and enters the sludge pads 12 equipped with a drainage system. Drainage water is pumped out by the drainage pump 13 into the “head” of the structures.

The electroflotator with a catalytic unit 4 comprises a flotation chamber 14 separated by a vertical baffle 15 from the catalytic unit 16 and separated by a horizontal baffle 17 from the anode chamber 18. The mesh cathode of the electroflotator 19 is located in the flotation chamber 14, the graphite anode 20 is located in the anode chamber 18. In the chamber the flotation device is a foam collecting device 21. The electrodes 19 and 20 are connected to a constant current source 22.

The construction of oily wastewater treatment works as follows. Wastewater enters the averaging tank 1, in which large suspended solids are deposited and are removed to the sludge pads 12. From the averaging tank 1, water is taken by a pumping station 2 and fed to a three-product hydrocyclone 3, in which emulsified oil products and suspended solids are separated from the water. Suspended matter is removed to the sludge pads 12, and the watered petroleum products enter the hydrophobic filter 8, in which they are concentrated and fed to the reservoir 9, and the extracted water enters the “head” of the structures. Further, the wastewater must be finely cleaned on an electroflotator 4. Purification of water from suspended solids and oil products occurs in the flotation chamber with 14 hydrogen bubbles generated by electrolysis of water. At the vertices of the pyramids of the foam collecting device 21, a foam is formed containing the recovered contaminants, called sludge. The flotation sludge is fed into a hydrophobic filter 8 for the concentration of petroleum products.

The water purified from dispersed contaminants in the flotation chamber enters the catalytic unit 16 loaded with a granular material of a fraction of 2-5 mm, which has a catalytic property. As a catalytic material used alumina-manganese catalyst AOK-75-41.

The same catalytic unit receives water from the anode chamber 18, containing gaseous oxygen generated by electrolysis of water on the anode 20 made of graphite. Oxygen oxidizes organic substances dissolved in water, and its oxidative power increases significantly due to the catalytic activity of the catalyst located in the catalytic block 16. The oxidation products are carbon dioxide and water, as well as water-soluble aldehydes, ketones and insoluble organic substances in the form of colloidal particles.

Further deep purification of water from colloidal particles and dissolved difficult-to-oxidize organic substances occurs in the electrochemical filter 5 and sorption filter 6, while the value of chemical oxygen consumption (COD), normalized when wastewater is discharged into water bodies, and the concentration of oil products are reduced.

The regeneration of filters 5 and 6 is carried out by backwashing with clean water, taken from the clean water tank 7 by the washing pump 10. The washing water settles in the sump 11, and then returns to the “head” of the structures, and the sludge is dehydrated on the sludge sites 12 equipped with a drainage system. Drainage water is pumped out by the drainage pump 13 into the “head” of the structures.

Example. Petrochemical production wastewater containing petroleum products, suspended solids, organic acids, anionic surfactants was purified. The results of chemical analysis of the source water before and after purification are shown in the table.

Table Pollutant Concentration, mg / L According to the prototype By utility model source the ultimate Effect, % source the ultimate Effect,% Oil products 180 0.05 99.97 180 0,03 99.98 Suspended matter 965 12 98.7 965 8 99,2 Anionic surfactants 36 26 27.8 36 0.2 99,4 COD 534 38 92.9 534 12 97.8

From the above results it follows that the effect of wastewater treatment from petroleum products and suspended solids according to the prototype and utility model is approximately the same, however, for surface active hardly oxidizable substances and for COD, the treatment effect for the utility model is significantly higher.

Claims (2)

1. The construction of oil-containing wastewater treatment, including a drive-averager, a three-product hydrocyclone, an electrochemical filter, a sorption filter, a hydrophobic filter and sludge pits, characterized in that it additionally contains an electroflotator with a catalytic unit separated from the flotation chamber by a vertical partition, and the anode chamber located at the bottom of the electroflotator and is separated from the flotation chamber by a horizontal partition, and the output of the flotation chamber and the anode chamber is connected to the input of the catalytic sky block. 2. The structure according to claim 1, characterized in that the catalytic unit is loaded with granules of aluminum-manganese catalyst material of a fraction of 2-5 mm.