Phenol adsorption on industrial activated carbon: evaluation of efficiency

Summary

The adsorption of phenol on activated carbon is considered one of the most efficient wastewater treatment systems. In this regard, the effectiveness of two Russian manufactured industrial activated carbon types in removing phenol from wastewater has been studied. The samples included powdered activated carbon (made from birch charcoal) and crushed activated carbon (made from coconut shells). The study was carried out under the conditions of pH variation and the effect of contact time and different initial concentrations of phenol on the adsorption process. The study was further expanded to clarify the adsorption kinetics and the Langmuir and Freundlich isotherm model. The results showed that activated carbon retained the maximum adsorption capacity over a wide pH range of 2 to 9. This fact proves the usability of coal for removing phenol from various wastewater types. The adsorption mechanism using both activated carbon samples followed the pseudo-second order and corresponded to the Langmuir isotherm model. The maximum adsorption capacity was 185.19 and 172.41 mg/g for powdered and crushed coal, respectively, suggesting a high efficiency of phenol removal from wastewater.

Key words

wastewater , phenols , adsorption , activated carbon , adsorption kinetics and isotherms

DOI 10.35776/VST.2022.09.07
UDC 628.16.081.32

Ahmed Sameh Abdelfattah Araby, Gogina Elena

Study of the competitive adsorption of a mixture of phenol and ammonia nitrogen on activated carbon

Summary

Phenol and ammonia nitrogen are considered typical pollutants present in industrial wastewater from various industries. Application of the response surface methodology (RSM) was used to develop a mathematical model for the simultaneous adsorption of phenol and ammonia nitrogen on activated carbon. The combined effect of pH, carbon doses, the initial concentration of phenol, and the initial concentration of ammonia nitrogen on the efficiency of adsorption was studied. Simulation using RSM gave a nontransformed quadratic model for phenol removal and a square root transformed linear model for ammonia nitrogen removal. The results of the study showed a positive effect of increasing the carbon dose on the adsorption of phenol, while an increase in the initial concentration of phenol had a negative effect on the efficiency of its adsorption. Almost complete removal of phenol was achieved within 90 minutes at pH4. In addition, the adsorption of ammonia nitrogen improved with increasing pH and carbon dose. The presence of ammonia nitrogen adversely affected the removal of phenol with pH increasing. However, the presence of phenol does not affect the adsorption of ammonia nitrogen.

Key words

wastewater , simulation , phenols , adsorption , ammonia nitrogen , activated carbon

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UDC 628.16.081.3:162.82

SMIRNOV A. D., Davlyaterova R. A., Tkachenko S. N.

Perspectivity of Application of Carbon Fibrous Sorbents for Water Treatment for Technogenic Pollutions

Summary

The main characteristics and properties of carbon fibrous sorbents for their application in sorption treatment of surface water for oil products and phenols are studied. It is established that the activated fibrous sorbent has considerably better kinetics of sorption than traditional granulated carbons. It is also established that the sorption capacity and coefficient of protective action of a layer of carbon fibrous sorbents by 6 times higher by phenol and efficiency of treatment by 1,5 times higher comparing with granulated activated carbons. The high efficiency and perspectivity of the use of carbon fibrous sorbents in combination with ozonization for removal of organic pollutants from surface water and wastewater are revealed. The technological decisions making it possible to reduce the size of equipment by 20–100 times are found. At the same time the sorption capacity by special-purpose biotoxicants increases by 1,5–3 times comparing with traditional materials at considerable reduction of costs for construction of large objects.

Key words

potable water , oil products , surface water treatment , phenols , carbon fibrous sorbent , granulated carbons , ozonsorption

DOI 10.35776/VST.2022.07.02
UDC 626.812

Lapin Pavel

Surface waters of the Orel Region rivers and their main pollutants

Summary

The results of a study of the qualitative composition of surface waters in the basin of the main rivers of the Orel Region (Oka, Dnieper and Don) that revealed critical pollution of the surface waters with phenols in most rivers, negligible – with nitrite nitrogen, no excess of MPC for iron was found, with the exception of the Dnieper River basin. To reduce the degree of pollution of the surface waters, a program of budgetary support of the water supply and wastewater disposal enterprises shall be provided to enhance the transition to the best available technologies for wastewater treatment; the cooperation with neighboring regions shall be improved; monitoring of the main pollutants of the water bodies in the Orel region shall be carried out; and the technological control of economic entities shall be executed considering their negative impact on the water bodies.

Key words

treatment facilities , wastewater , oil products , phenols , surface water , environmental protection

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