Physicochemical Treatment of Dyes and Pigment Manufacturing Industrial Waste-Water- A Review

A lot of water is used and lot of wastewater generated from industries due their processes and washing purpose. A large number of chemicals are used for the production of potable water and in the treatment of wastewater effluents. Potable water treatment chemicals such as inorganic salts and polymeric organic coagulants are used for primary coagulation, as coagulant aids and for sludge dewatering; lime and soda ash allowed for pH correction and water stabilization; Ca(OH)2 is used for pH adjustment, powdered activated carbon (PAC) can remove taste and odour compounds and micro pollutants. dyes and pigment manufacturing industrial waste water having high NH3 –N of 5712mg/L and COD of 42000mg/L. Flocculation in chemical treatments by Ca(OH)2, increasing the PH has provided a most favourable condition for waste water treatment. Then coagulation is done by chemicals with Polly-Aluminium Chloride and Fentons Reagent and find an optimal and economic treatment method Coagulation is one of the most important physicochemical operations used in water, and wastewater treatment can be achieved by chemical and electrical means Coagulation and flocculation occur in successive steps intended to overcome the forces stabilizing the suspended particles, allowing particle collision and growth of floc. Coagulation has been defined as the addition of a positively charged ion of metal salt or catalytic polyelectrolyte that results in particle destabilization and charge neutralization. Coagulation targets the colloid particles of size 10-7 to 10-14 cm in diameter. The colloid particles exhibit Brownian movement through the water; their surface is negatively charged so they repel one another, and they form a stable dispersed suspension. The main object of review is focused on research work done as well as the basic concept behind treatment and application by the researcher on different industrys waste-water treatment.