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Information about AlanKirby

Published on January 8, 2008

Author: Mercede



CONSTRUCTED WETLANDS Tertiary Treatment of Wastewater:  CONSTRUCTED WETLANDS Tertiary Treatment of Wastewater By: Alan Kirby, MEng, PEng. Environmental Technology College of the North Atlantic WETLAND DEFINATION:  WETLAND DEFINATION DEFINED AS AN AREA WHERE THE LAND IS SATURATED BY WATER LONG ENOUGH TO PROMOTE CONDITIONS OF POORLY-DRAINED SOILS, WATER-LOVING VEGETATION, AND BIOLOGICAL PROCESSES SUITED TO WET AREAS CLASSIFICATION SYSTEM:  CLASSIFICATION SYSTEM Bog: 18 forms and sub-forms Fen: 17 forms and sub-forms Swamp: 21 forms and sub-forms Marsh: 20 forms and sub-forms Shallow water: 24 forms and sub-forms CONSTRUCTED WETLANDS:  CONSTRUCTED WETLANDS Two basic types Surface flow systems open water 2m depth Sub-surface flow system water table at soil surface very shallow water CONSTRUCTED WETLANDS:  CONSTRUCTED WETLANDS Considered tertiary wastewater treatment Secondary treatment options Mechanical treatment options Fixed growth systems Suspended growth system Stabilization ponds Influent wastewater must be of a secondary quality BOD 20 mg/L or less TSS 30 mg/L or less High nutrients levels BENEFITS OF CONSTRUCTED WETLANDS:  BENEFITS OF CONSTRUCTED WETLANDS Suspended solids will settle in the slow moving waters Natural and bacterial processes convert and remove nitrogen Phosphorus is consumed by plants Algae and bacteria feed on organic matter Habitat for a wide variety of microscopic organisms Attracts waterfowl River Hebert Marsh:  River Hebert Marsh Constructed Wetlands for Wildlife and Improved Wastewater Treatment River Herbert Marsh:  River Herbert Marsh Summary Results Percent Removal, June 96 - July 98 :  Summary Results Percent Removal, June 96 - July 98 Slide10:  May 96 Jun 96 Jul 96 Aug 96 Sep 96 Oct 96 Nov 96 Dec 96 Feb 97 Mar 97 Apr 97 May 97 June 97 July 97 Aug 97 Sep 97 Oct 97 Nov 97 Dec 97 Jan 98 Feb 98 Mar 98 Apr 98 May 98 Jun 98 Jul 98 Aug 98 Date 1 10 100 1000 10000 100000 Colonies per 100 ml Lagoon Effluent Segment 1 Outflow Fecal Coliform Bacteria Slide11:  Biological Oxygen Demand Slide12:  Suspended Solids Slide13:  Total Phosphorous Slide14:  Total Nitrogen

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