Industrial wastewater treatment methods are introduced:

1、what is the harm of phenol-containing wastewater, how to deal with?

Phenol-containing wastewater mainly comes from coking plants, gas plants, petrochemical plants, insulating material factories and other industrial sectors, as well as petroleum cracking ethylene, synthetic phenol, polyamide fibers, synthetic dyes, organic pesticides and phenolic resin production process.

Phenol-containing wastewater mainly contains phenol-based compounds, such as phenol, cresol, dimethylphenol and nitrocresol. Phenol-based compounds are protoplasmic poisons that can coagulate proteins. The mass concentration of phenol in the water reaches 0.1-0.2mg/L, the fish that is odor, can not be eaten; the mass concentration increased to 1mg/L, will affect the fish spawning, containing phenol 5-10mg/L, the fish will be a large number of deaths. Drinking water containing phenol can affect human health, even if the water contains phenol quality concentration of only 0.002mg / L, chlorine will also produce chlorophenol odor.

Usually the quality concentration of 1000mg / L of phenol-containing wastewater. Called high concentration of phenol wastewater, this wastewater must be recovered phenol, and then treated. Phenol wastewater with a mass concentration of less than 1000mg/L is called low concentration phenol wastewater. Usually this kind of wastewater is recycled and the phenol is concentrated and recovered for treatment. Methods of phenol recovery include solvent extraction, steam blowing off, adsorption, closed loop method, and so on. Wastewater with phenol concentration below 300mg/L can be treated by biological oxidation, chemical oxidation, physico-chemical oxidation, etc. and then discharged or recycled.

2、How to treat mercury-containing wastewater and what are the characteristics of mercury-containing compounds?

Mercury-containing wastewater mainly comes from non-ferrous metal smelters, chemical plants, pesticide factories, paper mills, dyestuff factories and thermal instrumentation factories.

Methods to remove inorganic mercury from wastewater include sulfide precipitation, chemical coagulation, activated carbon adsorption, metal reduction, ion exchange and microbiological methods. General alkaline wastewater containing mercury is usually treated by chemical coagulation or sulfide precipitation. Acidic wastewater containing mercury can be treated by metal reduction method. Low concentration of wastewater containing mercury can be treated by activated carbon adsorption method, chemical coagulation method or activated sludge method. Organic mercury wastewater is more difficult to treat, and organic mercury is usually oxidized to inorganic mercury first, and then treated later.