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A Critical Review on Economical and Sustainable Solutions for Wastewater Treatment Using Constructed Wetland

Vishwakarma Smily, Dharmendra Dr

Civil and Environmental Engineering Reports

2022

Vol. 32, no. 3

260--284

Pollutant removal by the mechanism of constructed wetland has led to low cost, highly efficient wastewater treatment technology. Constructed wetlands (CWs) are artificial engineered systems that mimic like natural wetlands. CW’s have been used in previous research to treat a broad range of waste streams at large-scale for low-cost application in wastewater management. Generally, the most literature has targeted a particular class of mechanism or the other due to lack of generalized techniques for wastewater management using CWs. This work focuses on to introductory information and review on concept of CWs based on the latest mechanisms for the wastewater treatment to inspire economical and sustainable solutions to water based environmental problems. This research emphasis CW mechanism, construction, design, and applications of CWs as well as optimization of CWs for the treatment of wastewater. This review also highlights the study with different treatment stages of CWs for removing pollutants from different types of wastewaters.

Si-modified aluminide coating deposited on TiAlNb alloy by slurry method

Goral M., Moskal G., Swadzba L., Tetsui T.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 21, nr 1

75-78

Purpose: Increasing oxidation resistance of TiAl intermetallic alloy by depositing aluminide coating by slurry method and investigation of the influence of Si addition on structure of obtained coatings. Design/methodology/approach: The structure of coatings was investigated by light scanning microscopy. The chemical composition of coatings was investigated by EDS method and XRD phase analysis was used as well. Findings: The investigation has showed that the thickness of the coatings was 40 micrometres. The structure of the silicon-modified aluminide coatings is as follows: - the outer zone consisting of TiAl3 phase and titanium silicides, - the middle zone consisting of columnar titanium silicides in phase TiAl3 matrix, - the inner zone consisting of TiAl2 phase. The analysis of the average chemical composition of the outer zone exhibited the gradual increase of the silicon content along with increase of this element in the slurry. Practical implications: The slurry method can be applied in aerospace and automotive industry as low-cost technology of producing of aluminide coatings on intermetallics. Originality/value: New method of depositing of Si modified aluminide coatings on TiAl alloys.