Assessment of wetland treatment performance under high salt conditions

Name: Pantip Klomjek

Organization : King Mongkut's University of Technology Thonburi. The Joint Graduate School of Energy and Environment. Environmental Technology

keyword: Constructed wetlands

; Kinetics

; Biochemical oxygen demand

; Soils, Salts in

Abstract: This research investigated the feasibility of using wetlands for high saline wastewater treatment by identifying appropriate wetland plants, operating conditions and treatment efficiencies. A kinetic model was also proposed for prediction of wetland performance based on BOD5 removal. Eight emergent plants namely cattail, Asia crabgrass, sedge, Amazon, watergrass, vetiver grass, salt meadow cordgrass and kallar grass which are either salt tolerant species or wetland plant were investigated in salt-affected treatment wetland. The system was fed with municipal wastewater spiked with NaCl and operated under intermittent flow with 5 days wet and 2 days dry cycle. Cattail and Asia crabgrass were found to be superior for saline wastewater treatment up to 16 mS/cm of EC based on their survivability, growth, residual waste production and capability for nutrient uptake and treatment performance. Variation of salt concentrations in the range of 4 to 32 mS/cm affected treatment performance of CW operated as continuous surface flow system at HRT of 0.5 to 5 days. Average reductions were in the range of 44.8-81.7 % for BOD5, -25.9-79.5 % for SS, -7.8- 54.5 % for NH3-N, 17.7-57.3 % for TKN and 2.3-24.6 % for TP. The results showed the potential of CWs for saline wastewater treatment though their performances were limited. The unexpected poor performance was probably due to nutrient enrichment in the system thereby inducing the growth of algae causing DO depletion at night and the partial failure of the system. A mode1 based on first order kinetic and growth inhibition model was formulated to predict BOD5 removal rate in salt-affected wetland. The predicted rate fitted well in comparison to the observed rate within tested conditions. Paired t-test analysis indicated that the difference between both removal rates was small enough to ignore.

King Mongkut's University Technology Thonburi. Library

Address: Bangkok

Email: info.lib@mail.kmutt.ac.th

Name: Suwanchai Nitisoravut

Role: Advisor

Created: 2003

Issued: 2007-07-16

Modified: 2013-11-27

วิทยานิพนธ์/Thesis

ISBN: 9744563761

CallNumber: JGSEE70

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Environmental Technology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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