Wastewater treatment equipment extraction solvent extraction processing of industrial wastewater
Industrial wastewater, refers to the process to remove the production process wastewater and waste liquid, which contains over water erosion is the industrial production of materials, intermediate products, by-products and production process, the pollutants in the environment that is caused by pollution, especially the important reason of water pollution.
Tianyi extraction using solvent extraction processing of industrial wastewater and effective wastewater treatment of harmful substances, protect the environment.
mercury wastewater containing mercury wastewater mainly comes from non-ferrous metal smelting, chemical plants, pesticide plant, paper mills, dye factory and thermal instrument instrument and meter plant, etc.
Removal of inorganic mercury in waste water from the method of sulfide precipitation, chemical coagulation method, active carbon adsorption qie, metal reduction method, ion exchange method and microbial method, etc.
General alkaline wastewater containing mercury usually or sulfide precipitation treatment by chemical coagulation method.
Partial acidic wastewater containing mercury metal reduction method available.
Low concentration of waste water containing mercury available activated carbon adsorption method, chemical coagulation method or activated sludge method process, organic mercury wastewater more difficult, often organic mercury oxidation for inorganic mercury first, and then for processing.
all kinds of mercury compounds toxicity difference is very big.
Basic non-toxic element mercury;
The mercuric chloride in inorganic mercury is highly toxic substances, mercury decomposition organic mercury goes faster, little toxicity;
Methyl mercury enters the body is easy to be absorbed, not easy to degrade, the discharge is slow, especially easy to accumulate in the brain.
Toxicity, such as minamata disease is caused by methyl mercury poisoning.
oil-bearing wastewater oily wastewater mainly comes from petroleum, petrochemical, steel, coking, coal gas station, mechanical processing and other industrial departments.
More than 1, the rest of the relative density is less than 1.
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 droplets size between 10 a 100 microns, heartfelt floating in the water.
Emulsified oil, the oil drop diameter less than 10 microns, not easily separated from the wastewater.
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.
heavy metal waste water of heavy metal waste water mainly come from mining, smelting, electrolysis, electroplating, pesticide, medicine, paint, paint companies such as the wastewater.
The type, content and existing form of heavy metals in wastewater vary with different production enterprises.
Due to destruction of heavy metals cannot be separated, and can transfer their presence and shift their physical and chemical form.
After chemical precipitation treatment, for example, the heavy metal in waste water from dissolved into a difficult soluble ionic form of Taiwan and settling down, moved to the sludge from the water;
After ion exchange treatment, the heavy metal ions in waste water transfer to the ion exchange resin, after regeneration and moved to the regeneration of waste liquid from the ion exchange resin.
No or little use toxic heavy metals;
Followed by adopting reasonable process flow, scientific management and operation, reduce the amount of heavy metals and waste water runoff, to minimize the amount of waste.
Heavy metal waste water should be produced in situ treatment, different other mixed wastewater, so as not to complicate the process.
More should not be not treated directly discharged into urban sewage, so as not to expand the heavy metal pollution.
Handling of heavy metal wastewater, is usually divided into two categories;
Can be used methods such as neutralization precipitation, sulfide precipitation, floatation separation method, electrolytic deposition (
Method, the diaphragm electrolysis method, etc. ;
Second, the heavy metal in waste water without changing its chemical conditions for enrichment and separation of the form, method can be used in reverse osmosis, electrodialysis method and evaporation method and ion exchange method, etc.
These methods should be based on waste water water quality, water quantity, and so on and so forth alone or combined.