TREATMENT OF OIL CONTAMINATED WASTE
The main components of oil-contaminated wastewater are mineral oil, in addition, there are rubbish, sediment, clay, surfactants, ... It is a viscous liquid with a characteristic odor, lighter than water, oxidized slowly, can last up to 50 years.
1. Properties of oil-contaminated wastewater
Water pollution is one of the most serious state of the natural environment destruction caused by modern civilization. To develep the socio-economic along with environmental protection, the treatment of oil-contaminated wastewater is the concern of many countries in general and Vietnam in particular.
The main components of oil-contaminated wastewater are mineral oil, in addition, there are rubbish, sediment, clay, surfactants, ... It is a viscous liquid with a characteristic odor, lighter than water, oxidized slowly, can last up to 50 years.
2. Existing forms of oil in wastewater
- Oil exists in the free form: in this form, after floating to the surface, it will become oil slicks, free oil will emerge on the surface of the water because its specific gravity is less than water’s.
- Oil exists in chemically emulsified form: is the form formed by chemical agents or asphatene chemicals that alter the surface tension and stabilize the dispersed oil chemistry.
- Oil exists in mechanically emulsified form: the diameter of the oil drop will define the stability is low or high.
Insoluble oils will form a film surrounding suspended solids, which affects the ability of suspended solids to settle or float, making it difficult to treat oil-contaminated wastewater Oils exist in dissolved form: molecules that dissolve as aromatic substances
3. Sources of oil-contaminated wastewater
The source of oil-contaminated wastewater is mainly from the following sources:
- Sources of oil-contaminated wastewater from oil rigs: synthetic wastewater contaminated with oil arising from the ship deck, equipment and machinery in the production process, cleaning machinery, equipment, dirty water of the ship bottom, ... .
- Source of oil polluted wastewater from oil spill: oil pollution caused by oil tanker sinks; equipment when having problems. Also due to oil eruptions in oil fields.
- The source of wastewater is contaminated with oil from petrochemical plants
- Sources of oil-contaminated wastewater generated from petroleum storage activities: wastewater generated from the rinsing and cooling of tanks; cleaning machines and equipment; gasoline spills, ...
- Source of oil-contaminated wastewater generated from the use of petroleum: it is difficult to avoid the loss of petroleum in the environment during use.
4. Oil-contaminated wastewater treatment technology
Treatment of oil-contaminated wastewater by biological methods
- Wastewater treatment by aerobic biological method
- Treatment of wastewater by anaerobic biological method
- Treating wastewater by biological methods without gas
Advantages: bio-oil-contaminated wastewater treatment method, which treats oil with high organic matter concentration; simple design and equipment; The system is easy to adjust to the concentration and flow of busy contamination.
Disadvantages : large investment costs; increase the generated wastewater flow, need a large area.
Treatment of oil contaminated wastewater by physical and chemical methods
- Filter through trash rack
- Concentration
- Filter
- Coagulation and flocculation
- Floatation
- Adsorption
- Ion exchange
- Reverse osmosis
- Ultrafiltration
- Dialysis and electrolysis
- Electrochemical methods
Advantages : The method of treating oil contaminated wastewater by physiochemistry has many advantages such as: higher treatment efficiency; occupies less area; can be completely automated; can recover various substances; capable of removing organic toxins that are not biologically oxidized; No need to monitor microbiological activity.
Treatment of oil contaminated wastewater by chemical methods
Advantages : chemical oil-contaminated wastewater treatment methods often use chemical agents, so the cost is high. Often uses chemical oil-contaminated wastewater treatment to remove solvents and in closed water supply systems and used for pre-treatment before biological or final wastewater treatment. when discharging water into the receiving source.
Van Lang Environment Company
Address: 1/1, Street 5, Ward 7, Go Vap District, HCMC.
Hotline: 0946 758 660 - Mr. Hieu or 0918 203 065 - Mr. Long
Email: vanlang@vlc.vn - congtymoitruongvanlang@gmail.com
Website: vlc.vn
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