Research School for Socio-Economic and
Natural Sciences of the Environment
Research School for Socio-Economic and
Natural Sciences of the Environment
Agenda

Thomas Vincent Wagner

Date: 25 February 2020
Location: Amsterdam

Dissertation title: 

The removal and transformation of conditioning chemicals in constructed wetlands treating cooling tower water

Group: Environmental Technology, Wageningen University

Promotors: Prof. Pim de Voogt; Prof Huub Rijnaarts
Copromotors: John Parsons; Alette Langenhoff

Abstract:

The reuse of cooling tower water in the cooling tower itself requires desalination of the cooling tower water. In this thesis, the pre-treatment before desalination of cooling tower water by constructed wetlands was studied, with a special focus on the removal and transformation of conditioning chemicals in these constructed wetlands. Conditioning chemicals are used to prevent processes that lower the cooling efficiency of cooling towers, such as scaling, corrosion and fouling. The outcomes of the research performed in this thesis show that i) conditioning chemicals are removed by different removal processes, such as adsorption, biodegradation and photodegradation; ii) conditioning chemicals can have a toxic effect on fauna in the constructed wetland and can hamper proper constructed wetland functioning; ii) the optimal constructed wetland design for cooling tower water treatment consists of a vertical-flow constructed wetland followed by a surface-flow constructed wetland and a subsequent horizontal subsurface flow constructed wetland.





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