Enhancement of biological treatment of petrochemical industry wastewater

Summary

Possible utilization of water conditioning wastes of thermal power plants – carbonaceous sludge – for the enhancement of biological treatment of petrochemical industry wastewater is considered. The sorption capacity of carbonaceous sludge in relation to organic and inorganic admixtures in wastewater – phenols and ammonia nitrogen in standardized test solutions was determined. The results of experimental studies of wastewater of «Nizhnekamskneftekhim» PJSC showed that dosing of 600 mg/dm³ of carbonaceous sludge into aeration tanks provided for improving the efficiency of wastewater treatment in relation to COD by 36%; BOD5 by 15% ammonia nitrogen by 28% owing to the sorption component. Under contact conditions the kinetic dependencies of COD, BOD and ammonia nitrogen reduction were obtained. With biotesting method it was stated that aqueous extract of carbonaceous sludge did not produce any adverse toxic effect on fish (guppies) and crustaceans (daphnia). The potential of using carbonaceous sludge of water conditioning at the thermal power plants for the enhancement of wastewater biological treatment processes is shown.

Key words

wastewater , ammonia nitrogen , phenol , carbonate sludge , adsorption-biological treatment , sorption capacity

Removal of oil products from industrial wastewater with the use of modified carbonate sludge-based sorption materials

Summary

Activated carbon adsorption is one the efficient methods of removing oil products from wastewater. This method provides for ensuring water quality that meets the requirements to the discharges into the surface water or the conditions of using in closed-loop water supply systems at the industrial plants. The data on the use of solid waste products as sorption materials in wastewater treatment are presented. Development of new cheap waste products-based sorption materials is of big scientific and practical importance. Utilization of granulated hydrophobous carbonate sludge-based sorption material (wastes of thermal power plants) as oil products adsorbent is suggested. Process characteristics and adsorption capacity of the material received were studied; express-testing of the quality of aqueous extract of the developed granulated adsorbent on the acute lethal toxicity for Daphnia Magna Str. crustaceans and Poecillia Reticulata Pet fish was carried out. The process flow scheme of wastewater treatment at «Nizhnekamskneftekhim» OJSC is presented. The calculations of an adsorption filter retrofitted into the scheme of tertiary treatment of conventionally clean effluents with new hydrophobous sorption material were carried out. It is suggested to use the outspent sorbent as an additive to construction ground coat.

Key words

adsorption , industrial wastewater , carbonate sludge , hydrophobous sorption material , adsorption equilibrium , outspent material utilization