cwl type centrifugal extraction machine industrialized treatment of oily wastewater
Oily wastewater including oil field wastewater, oil refinery and chemical plant wastewater, oil tankers of ballast water, washing water, engine room, oil tank,
Car wash water, etc.
This is caused by oil pollution environment, especially Marine oil pollution (
See the oil pollution)
The main source.
Coal tar is contained in gas plant, coking plant wastewater, tanneries, food processing plant wastewater containing animal and plant oil.
These also belong to oily wastewater, but the proportion is not big.
oil substances in the waste water usually exist in three states.
Floating oil: oil droplets size is larger than 100 microns and is easy to be separated from the wastewater.
Oil in the wastewater dispersed particles is bigger,> = 100 microns in size, easy to separated from the wastewater.
In the oil sewage, this oil accounted for the total oil content in water of 60 ~ 80%.
Particle size of the dispersed oil: oil droplets between 10 a 100 microns, suspended in the water.
Emulsified oil: oil droplets size less than 10 microns, the oil in the wastewater dispersed particle size is small, emulsified state, not easily separated from the wastewater.
Dissolve oil: � � class dissolved in water.
oily wastewater contained oil substances, including crude oil, oil products, tar and extractant, and consumption of animal and plant oil and fat.
From the water body pollution, mainly oil and tar.
Due to different industrial sectors the wastewater in oil concentration difference is very big, such as during the process of refining waste water, the oil content is about 150 an 1000 mg/L, the tar content in the coking wastewater is about 500 an 800 mg/L, the gas occurrence station are the tar content in effluent can reach 2000 a 3000 mg/L.
Oily waste water management, therefore, should first USES the separation tank, recovery of oil or heavy fuel oil, processing efficiency is 60% 80%, oil content in produced water about 100 an 200 mg/L;
Of emulsified oil wastewater and dispersed oil is more difficult, therefore, should prevent or mitigate emulsifying phenomenon.
One way, it is in the process of production attention to reduce the medium oil emulsion wastewater;
Second, is in the process, as far as possible to lower the number of pump ascending wastewater, so as not to increase emulsification degree.
Treatment usually adopt air flotation and demulsification method.
oily wastewater if not be recycled, will cause waste;
Discharged into rivers, lakes or the gulf, polluted water, affecting aquatic creatures;
Can jam is used for agricultural irrigation, the soil, obstruction of crops.
of oily waste water treatment should first consider recycle oil substances, and make full use of the treated water.
Oily wastewater treatment, therefore, can use first separation tank, recycling oil or heavy fuel oil.
Separation tank is suitable for the separation of larger particles in waste oil, processing efficiency is 60 ~ 80%, and the oil content in water is about 100 ~ 200 mg/l.
Wastewater in small oil and emulsified oil is difficult to remove.
centrifugation is to make the containers of oily waste water at high speed, centrifugal force field, due to the density of solid particles, oil bead and waste water, under the centrifugal force is different also, achieve to remove solids from the wastewater, oil bead method.
The used equipment is hydrocyclone separator.
Although the solid-liquid separation and the basic principle of liquid-liquid separation are the same, but larger difference in the geometrical structure of the equipment.
Special instructions. cwl type centrifugal extraction machine belongs to the typical liquid-liquid extraction separator, applies only to liquid liquid separation.