Waste water detoxification
The wastewater detoxification is for environmental protection must-chemical process, the waste water to free from any chemical waste and foreign substances. It is an essential part of wastewater purification and treatment in industry.
The construction of wastewater detoxification plants , which used to be very controversial and costly, is now a matter of course for many industrial companies.
The wastewater from chemical plants as well as from other industrial plants such as hardening shops , metal pickling shops and electroplating plants often contain poisonous ions such as the cations Cd 2+ , Zn 2+ , Pb 2+ or the anions CrO 4 2− ( chromates ), CN - ( cyanides ), NO 2 - ( nitrites ). They have to be removed from the wastewater before it is returned to the natural water cycle . For this purpose, after mechanical and biological treatment, the wastewater passes through a single-column mixed-bed ion exchanger as the last treatment step . In it, cation and anion exchange balls are mixed to form a bed . The poisonous ions are bound there in exchange for H + or OH - ions. The loaded ion exchange bulk must be disposed of as hazardous waste.