Disclaimer & Copyright Notices; Optimized for the MS Internet Explorer

Ecological impacts of nutrients from sewage treatment plants (STP/WWTP)

Credible scientific modus operandi for appraisal prior to (not after) regulatory approval

Soil & Water Conservation Society of Metro Halifax (SWCSMH)

July 26, 2006                                        Sewage Management

For several years there has been wide concern among our member-professionals all over HRM with respect to the long term impacts of STPs (sewage/wastewater treatment plants). NSDEL does not have any established scientific criteria for approvals. The probable impact of an STP on a freshwater lake can be quite significant, especially during the summer months when the lakes do not flush appreciably.

While the design of an STP is the domain of a professional engineer, the only professional who has the credibility in the scientific evaluation is a limnologist/professional lake manager. It is unethical and unprofessional for a professional engineer to impinge into the domain of a professional limnologist.

Inserted below is a 12-page published paper of a leading chemical limnologist, Joe Kerekes PhD, Scientist-Emeritus with Environment Canada Atlantic, Dartmouth. Dr. Kerekes was also one of the leading scientists who headed the international OECD (Organization for Economic Co-Operation & Development) peer consensus standards-development.

In this published paper, Dr. Kerekes carries out an intensive scientific analysis of the impact of a proposed secondary-level package STP prior to its installation at a development site which drains into Freshwater Lake, Cape Breton Highlands National Park. He warns against secondary treatment as that would result in the Freshwater Lake becoming `Mesotrophic’, its management objective being `Oligotrophy’!!

(cf. Kerekes, 1983)

[Img- Kerekes_1983-1]
[Img- Kerekes_1983-2]
[Img- Kerekes_1983-3]
[Img- Kerekes_1983-4]
[Img- Kerekes_1983-5]
[Img- Kerekes_1983-6]
[Img- Kerekes_1983-7]
[Img- Kerekes_1983-8]
[Img- Kerekes_1983-9]
[Img- Kerekes_1983-10]
[Img- Kerekes_1983-11]
[Img- Kerekes_1983-12]

Sewage Management                     Soil & Water Conservation Society of Metro Halifax (SWCSMH) Master Homepage

We salute the Chebucto Community Net (CCN) of Halifax, Nova Scotia, Canada for hosting our web site, and we applaud its volunteers for their devotion in making `CCN' the best community net in the world