Up
Biosolids Management
Commissioning
Odour Control Services
SCADA
Security
Solidwaste Services
Wastewater Services
Water
Trenchless Tech.
Stormwater

 

Providing 

Innovative Solutions 

for Our Clients 

since 1965

Services - Odour Control

Dayton & Knight Ltd. can assess your odour control requirements and provide recommendations on a variety of odour mitigation methods.           
Odour treatment may be required for any treatment plant and is often subject to climatic conditions and siting.  Dayton & Knight Ltd has the expertise and experience in controlling and correcting odour problems in wastewater treatment processes.

 To Left: Odour Control - Wet Chemical Scrubber at City of Salmon Arm WPCC
The main types of odour problems generated in wastewater treatment facilities are:
Hydrogen Sulphide (rotten egg smell), 
Dimethyl Sulphide (rotten vegetable smell), 
Methyl Mercaptan (rotten cabbage or garlic smell), 
Dimethyl Disulphide (rotten organic matter smell) and 
Ammonia.

Some of the methods that Dayton and Knight utilizes in controlling odour are:

  • Odour surveys - air quality measurements, soap bubble tests, and smoke bomb testing;

  • Chemical addition (ferrous chloride, ferric chloride, hydrogen peroxide, potassium permanganate, sodium hypochlorite);

  • Chemical masking agents;

  • Covering and venting of structures;

  • Septage dilution techniques;

  • Biological scrubber towers (nitrifying and/or caustic);

  • Trickling filter media for use as a biological scrubber;

  • Compost biofilters (for scrubbing wastewater treatment process offgases and sewage pumping station wet well offgases);

  • Exhaust ducting and stacks

  • Ozone generation for vapour phase oxidation.

Typical Odour Quality Objectives

 

Standard

 H2S Concentration  Significance
SHE, WCB Appendix A

15 ppm

 

 

10 ppm

Allowable Worker Exposure up to 15 minutes

Allowable Worker Exposure up to 8 hours
Emissions after treatment

< 0.1 ppm

 Treatment Objective
Property Line

< 0.005 ppm

 10 X Olfactory Threshold
Olfactory Threshold

0.00047 ppm

(0.47 ppb)

(not yet measurable with meter)

  • The olfactory threshold is the concentration of substance that is recognizable by a lay person to be present where no presence was recognizable before its introduction

  • Allowable ammonia concentrations for worker exposure are 25 ppm for eight hours and 35 ppm for 15 minutes.

For more information on Dayton & Knight Ltd.'s capabilities and experience on odour control, please visit our Projects page or contact:

 

John Boyle (jboyle@dayton-knight.com)

or

Harlan Kelly (hkelly@dayton-knight.com)

 

 


Back to Top
 

 Copyright © 2000 - 2008 Dayton & Knight Ltd.