What are the applications of coalescers in the water treatment industry
Information summary：1、 Oil and gas extraction/oilfield water treatment
1. Depth degreasing of produced water (formation produced water)
Crude oil extraction is accompanied by a large amount of formation water, which contains a large amount of dispersed emulsified oil. Conventional oil separators cannot remove oil droplets below 10 μ m. The coalescer is arranged after the first stage gravity separator to coalesce an
1、 Oil and gas extraction/oilfield water treatment
1. Depth degreasing of produced water (formation produced water)
Crude oil extraction is accompanied by a large amount of formation water, which contains a large amount of dispersed emulsified oil. Conventional oil separators cannot remove oil droplets below 10 μ m. The coalescer is arranged after the first stage gravity separator to coalesce and float oil droplets in the water, reducing the oil content in the effluent to less than 10ppm, meeting the formation reinjection standards, and avoiding oil pollution blocking formation pores and corroding water injection pipelines.
2. Water treatment for offshore platform production
The platform space is narrow, and a pry mounted coalescer replaces a large flotation tank to treat the produced water in a short process. After meeting the standards, it can be reinjected or discharged near the sea; Simultaneously separating and recovering crude oil to reduce resource consumption.
3. Supporting oil removal for ballast water treatment
The ballast water of ships/offshore platforms is mixed with fuel and lubricating oil, and the oil pollution is removed before the aggregation unit to protect the subsequent sterilization and filtration modules, avoiding membrane and filter blockage caused by oil pollution.
2、 Wastewater treatment for refining, petrochemical, and coking industries
1. Pre treatment of electric desalination wastewater
Desalination of crude oil produces highly emulsified oily wastewater, which is first subjected to pre oil removal by a coalescer, significantly reducing the amount of air flotation (DAF) agent added in the rear end, reducing the production of floating slag, and lowering the load on the biochemical tank.
2. Coking/cracking acid water de oiling
The coking wastewater contains heavy tar and emulsified hydrocarbon. The coalescer breaks the stable water in oil lotion, separates the tar for recovery, and protects the downstream stripper and sulfur recovery unit from coking and blockage.
3. Purification and reuse of process condensate water
The condensed water from the heat exchanger and distillation tower of the device leaks and mixes with oil products. After removing trace amounts of oil stains through coalescence, the purified water can be reused for circulating cooling water and boiler makeup water to avoid oil film adhesion to the heat exchanger, reduce heat transfer efficiency, and prevent boiler tube bursting and corrosion.
4. Initial rainwater and ground flushing water treatment in the factory area
The rainwater in the tank area and loading and unloading area carries floating oil, and the coalescer quickly separates the floating oil. After the rainwater meets the standard, it is discharged into the municipal sewage pipe network.
3、 Water treatment in the power industry
1. Cooling drainage and shaft seal drainage oil removal of steam turbine unit
Turbine lubricating oil leaks into the cooling water, and trace amounts of oil in the water can clog the packing of the circulating water cooling tower and breed microbial sludge; The online oil removal of the coalescer ensures the long-term stable operation of the circulating water.
2. Pre protection of boiler feedwater
If the boiler feedwater contains oil, it will carbonize and scale at high temperatures, blocking the heat exchange tubes; Agglomeration serves as a pretreatment to intercept trace hydrocarbon impurities and extend the service life of boilers and reverse osmosis membranes.
3. Treatment of gas turbine fuel flushing wastewater
The wastewater from fuel cleaning contains a large amount of diesel and lubricating oil, which are collected and separated to recover fuel. The tailwater is discharged in compliance with standards.
4、 Wastewater treatment for mechanical manufacturing and metallurgical processing
1. Machining cutting fluid/grinding fluid wastewater treatment
Emulsified cutting fluid wastewater is generated during milling and grinding processes. The oil droplets are stable and difficult to separate, and they coalesce efficiently to break down and remove oil. The cutting oil is recycled and reused, greatly reducing the COD of the wastewater and alleviating the pressure of biochemical treatment.
2. Oil containing circulating water for steel rolling and cold rolling
Rolling emulsion wastewater contains rolling oil, which is separated and recovered by a coalescer, and purified water is reused in the production line; The discharged tail water is stable and meets the standard.
3. Waste water from component cleaning
Ultrasonic cleaning and spray cleaning wastewater contain mineral oil, cleaning agent emulsified oil, and coalesce as pre-treatment units.
5、 Ship and Port Maritime Water Treatment
1. Core unit for ship bilge water treatment
The leakage of fuel and hydraulic oil in the engine room forms bilge water, and the International Maritime Organization (IMO) requires the discharge of water with an oil content of less than 15ppm; The oil-water separator is equipped with a coalescing filter element to remove emulsified oil and meet the requirements of ocean discharge regulations.
2. Port and dock cleaning water, oil tank cleaning wastewater
The washing wastewater from the dock is high in oil content, and it is treated centrally by a pry and aggregate device to recover oil products. The tail water is connected to the park's sewage station.
6、 Chemical, pharmaceutical, chemical water treatment
1. Solvent water separation in the extraction section
The extraction process of pharmaceuticals and pesticides generates solvent emulsified wastewater, which is then separated and recycled as organic solvents to reduce hazardous waste production.
2. Deep degreasing of chemical production wastewater
The wastewater from auxiliary agent and resin production contains surfactant stabilized lotion, which can be coalesced and physically demulsified without a large number of demulsifiers, reducing the operation cost.
7、 Treatment of wastewater from food and oil processing
1. Wastewater from vegetable oil refining and slaughter cleaning
Animal and vegetable oils and fats in wastewater form emulsions, which aggregate and float up for recovery, reducing effluent COD, ensuring microbial activity in the back-end biochemical tank, and avoiding sludge floating caused by oil wrapping.
2. Centralized oil-water deep treatment in catering
Large canteens, kitchen wastewater, and small coalescers are installed at the back of the grease trap to remove dissolved emulsified oils and prevent blockages in the municipal pipeline network.
8、 Reclaimed water reuse, membrane system pre protection (universal water treatment matching)
1. RO reverse osmosis and ultrafiltration system security pre installation
If industrial recycled water or reclaimed water contains trace amounts of oil, it will irreversibly contaminate membrane components; As a pretreatment, the coalescer intercepts emulsified oil in water, greatly extending the membrane's service life and reducing cleaning frequency.
2. Circulating cooling water bypass oil removal
After the oil leakage in the circulation system, the bypass coalescence device continuously removes the oil film from the water, preventing the growth of algae and sludge, and reducing the consumption of corrosion and scale inhibitors.
9、 Comprehensive sewage treatment for municipal and industrial parks
1. Centralized pretreatment of comprehensive oily wastewater in industrial parks
Collect wastewater from mechanical, chemical, and automotive repair enterprises, aggregate and remove oil before entering the biochemical system, and stabilize the effluent to meet standards.
2. Wastewater from car wash spaces in auto repair and gas stations
Car wash wastewater contains engine oil and gasoline emulsion, which can be treated on-site by small coalescing equipment to prevent oil pollution from entering the municipal pipeline network.
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