1、What is phenol wastewater hazards, what to do?
 Phenol wastewater mainly from the coke plant, gas, petrochemical plants, insulation materials plant and other industrial sectors as well as oil cracking ethylene, synthetic phenol, polyamide fibers, synthetic dyes, organic pesticides and phenolic resin production process. Phenolic wastewater in phenolic compounds such as phenol, cresol, xylenol and nitro cresol and so on. Phenolic compound is a protoplasm poison, can protein coagulation. Concentration of phenol in water to 0.1 of a 0.2mg / L, the fish that smell, can not eat; increased concentration of 1mg / L, will affect fish spawning, phenol 5-10mg / L, fish Will be a large number of deaths. Phenol in drinking water can affect human health, even if the concentration of phenol in water only 0.002mg / L, chlorine disinfection will produce chlorophenol odor. Usually the concentration of 1000mg / L of phenol wastewater. Known as the high concentration of wastewater, waste water to be recycled this phenol, and then processed. Concentration of less than 1000mg / L of wastewater, known as the low concentration of phenolic wastewater. Usually this type of waste recycled, the phenol concentration and recovery after treatment. Methods of recovery of phenol solvent extraction, steam stripping, adsorption, closed loop method. Phenol concentration in the 300mg / L below the water available biological oxidation, chemical oxidation, chemical oxidation and other methods of physical treatment before discharge or recycling.

2、How to control mercury-containing waste, mercury compounds, what characteristics?
 Mercury-containing waste water mainly comes from non-ferrous metal smelters, chemical plants, pesticide plants, paper mills, dye works and other thermal instruments Instrument Factory. Removal of inorganic mercury from wastewater methods are sulfide precipitation, chemical coagulation, activated carbon adsorption of confidence, metal reduction, ion exchange and micro-law. Generally alkaline chemical commonly used mercury-containing waste water condensation method or sulfide precipitation method. Acidic metal reduction of mercury-containing waste water treatment available. Low concentrations of mercury-containing waste water can be activated carbon adsorption, chemical coagulation or activated sludge process, organic mercury waste more difficult, usually first oxidized to inorganic mercury organic mercury, and then processed.
 The toxicity of various mercury compounds vary greatly. Basic non-toxic elemental mercury; inorganic mercury in the mercuric chloride is highly toxic substances, organic mercury in the rapid decomposition of phenyl mercury toxicity is not; Methylmercury is easily absorbed into the body, not easily degradable, excretion is very slow, particularly It is easy to accumulate in the brain. Most toxic, water Minamata disease is caused by the methylmercury poisoning.

3、What characteristics of oily waste water, how to rule?
 Oily waste water mainly comes from petroleum, petrochemicals, steel, coking, gas stations, machinery processing and other industrial sectors. Oil pollutants in wastewater, in addition to the relative density of heavy tar more than 1.1, the rest of the relative density of less than 1. Oils in wastewater are usually exists in three states. (1) floating on the oil droplets size greater than 100μm, easy-to-separated from the wastewater. (2) dispersed oil. Droplet size range between 10 to 100μm, Ken floating in the water. (3) emulsified oil droplets size smaller than 10μm, easily separated from the wastewater. The different industrial sectors in the oil concentration wastewater vary widely, such as waste water produced during oil refining, oil is about 150 to 1000mg / L, tar content in the coking wastewater is about 500 a 800mg / L, gas stations in the waste water The tar content of up to 2000 a 3000mg / L. Therefore, the oily wastewater treatment should first use of grease traps, oil slick or heavy oil recovery, processing efficiency of 60% to 80%, the water of oil is about 100 to 200mg / L; wastewater emulsified oil and dispersed oil is more difficult Treatment, it should be to prevent or reduce the emulsification. One way is to note that in the production process to reduce waste oil emulsion; the other is in the process to minimize the number of waste water pump upgrade, to avoid increasing the degree of emulsification. Treatment usually flotation and emulsion breaking method.

4、Sources of heavy metals in wastewater treatment principles?
 Heavy metal waste water mainly from the mining, smelting, electrolysis, electroplating, pesticides, pharmaceuticals, paints, pigments and other enterprises wastewater. Heavy metals from wastewater types, with different content and production enterprises existing form to another. Because heavy metals can not break down damage, but can only transfer them to change their position and the existence of the physical and chemical form. For example, the chemical precipitation treatment, waste water from the dissolved ions of heavy metals into insoluble forms of property and settle down in Taiwan, transferred to the sludge from the water; by ion exchange treatment, the wastewater in the transfer of heavy metal ions into the ion Exchange resin, the regeneration of ion exchange resin and then transferred to the regeneration of waste liquid. Therefore, the heavy metal wastewater treatment principles are: first, the most fundamental is the reform of the production process. No or little use of heavy metal toxicity; followed by a reasonable process, scientific management and operation, to reduce the amount of heavy metals with water loss and to minimize the amount of water efflux. Heavy water production sites should be in situ treatment, wastewater is mixed with different other, so as not to deal with complications. Shall not be treated less directly into the city sewer, so as not to expand the heavy metal pollution. Of heavy metal waste water treatment, can generally be divided into two categories; one that was dissolved in waste water of heavy metals into insoluble metal compounds or elements, the precipitation and removal from wastewater floating. And can be applied to methods, such as in precipitation, sulfide precipitation, floating separation, electro-deposition (or float) method, diaphragm electrolysis, etc.; Second, the heavy metals in wastewater without changing its chemical form and concentration under the conditions Separation method can be applied to reverse osmosis, electrodialysis, evaporation and ion exchange method. These methods should be based on wastewater quality, quantity, etc. alone or in combination.

5、How to deal with cyanide wastewater?
 Mainly from the electroplating wastewater containing cyanide, gas, coking, metallurgy, metal processing, chemical fiber, plastics, pesticides, chemicals and other departments. Wastewater containing cyanide is a toxic industrial waste water, stable in the water, easier to break down organic cyanide and inorganic cyanide and are all highly toxic substances, human ingestion can cause acute poisoning. Human lethal dose of cyanide 0.18, potassium cyanide is 0.12g, the fish died of cyanide concentration of 0.04 of a 0.1mg / L. Cyanide wastewater treatment measures are: (1) reform process, to reduce or eliminate the discharge of wastewater containing cyanide outside, such as cyanide-free electroplating method can be used to eliminate industrial waste electroplating workshop. (2) high levels of waste water containing cyanide should be used to recycling, low waste water containing cyanide should be purified before discharge. Acidification aeration recovery methods - alkali absorption method, steam desorption method. Alkaline chlorination treatment methods, electrolytic oxidation, hydrolysis pressure, biochemistry, biological ferric sulfate, ferrous sulfate method, air-stripping method. Including wider application of alkaline chloride, ferrous sulfate treatment is not complete nor stable, the air stripping only pollute the atmosphere, water and reach the emission standards. Less used.