Lift Station New Scents or Non-Scents?

Transcription

1 Lift Station New Scents or Non-Scents? MWEA IPP Seminar September 25, 2008 Presented By: John C. Rafter, Jr., P.E., DEE AKA: Jack the Sniffer Fishbeck, Thompson, Carr & Huber, Inc. engineers scientists architects constructors

2 How I Got Here

3 So, what s this all about? What is an odor? Where to start? What are the options? Will it go away?

4 What is an odor? Odor is a sensation Odorous compounds stimulate smell and taste Trivia: The human nose has 1 million odor receptor cells

5 Why minimize odors? Health issues Environmental effects Nuisance complaints Regulations Odors are sometimes good to have, they are a sign of things happening eminent failure

6 What do people smell? Organic and inorganic gases or vapors fishy pungent, fruity rotten cabbage putrid garlic putrid, fishy ammonia fecal decayed cabbage rotten eggs nauseating irritating skunky Basic compounds: hydrogen sulfide, ammonia, CO 2, methane, also organic sulfide, amines, and mercaptans

7 Tom Fitzpatrick What do people smell? You walk out of the Amphitheatre after watching the Rolling Stones perform and suddenly the Chicago Stockyards smell clean and good by comparison.

8 So, where do we start?

9 Steps to Identify an Odor Odor Detected Investigation Begins Odor Not Identified Odor Identified

10 Steps to Identify an Odor Odor Not Identified Sample Odor Odor Panel Odor Analysis

11 Steps to Identify an Odor I don't know what that gas is made of, but it can't smell any worse than Ernie Johnson 's gym bag. Charles Barkley

12 Steps to Identify an Odor Odor Identified Treatment Strategy Odor Masking Odor Abatement

13 Steps to Identify an Odor Conduct a preliminary survey Dissolved oxygen (DO) Oxidation-reduction potential (ORP) Total sulfide Gas tubes or electronic gas detector meters

14 Steps to Identify an Odor When do I survey? When it smells! Usually during hot summer days

15 Steps to Identify an Odor Generally, what are the causes? Long detention time Warm wastewater (temperature) Long dry spells Industry

16 Steps to Identify an Odor Guests, like fish, begin to smell after three days. Benjamin Franklin

17 Steps to Identify an Odor Liquid Stream Flow, DO, temperature, ORP, total sulfide, dissolved sulfide 2 to 6 hours Oxygen uptake rate 4 to 8 hours Sulfate, BOD 5 /COD, SS composite Gas Phase H 2 S, mercaptans 2 to 4 hours Other compounds (gas chromatography or mass spectrometry) as needed Odor intensity Effective dose (ED 50 )

18 What are the options? What is important to you? Capital Operation and maintenance Non-monetary items

19 What are the options? What non-monetary items are important to you? Safety and containment Transporting Chemicals Expected life Performance Reliability

20 What are the options? The first condition of understanding a foreign country is to smell it. Rudyard Kipling

21 What are the options? How can you minimize odors? Reduce sulfide concentration Equalize the flow pattern Work with your industrial customers Minimize splashing in MHs Clean em!

22 Speaking of cleaning out a line...

23 What are the options? Control Options Liquid Phase Oxygen using air or pure O 2 injection (aka: superoxygenation) Sodium hypochlorite injection Hydrogen peroxide, ferrous or ferric salts, or potassium permanganate injection. Nitrate salts Proprietary compounds

24 What are the options? Gaseous Phase Masking Agents Essential oils Other

25 What are the options? I judge people on how they smell, not how they look. Jennifer Lopez

26 What are the options? Gaseous Phase Vapor phase treatment: Biofiltration Scrubbing Adsorption Condensation Catalytic oxidation Thermal oxidation

27 What are the options? Biofilters Treat large flows Low pressure requirements No chemicals required

28 What are the options? Activated Charcoal Filters Treat a variety of compounds Common use Increase range with additive compounds

29 What are the options? Wet Scrubbers Widely used Handles large gas flows Can handle varying concentrations

30 What are the options? Ionize Air System Compact Oxidizes organic odors

31 What are the options? Biotrickling Filter Modular design Low-profile design Factory assembled

32 What are the options? UV Chamber Specific frequencies of UV light Compact Pass ambient air through system

33 Case History: Saline WWTP Odors at 7 a.m. and 5 p.m. Plant flow negligible at night Already had an odor scrubber

34 Case History: Saline WWTP

35 GH-SL Lift Station Periodic odors Affected condos Localized

36 GH-SL Lift Station Began with an odor control study Reviewed mechanical technologies versus chemical additions Identified controlling factors Currently using a combination approach: chemical additive and customized activated carbon filter

37 NO Will it go away?

38 Thank You engineers scientists architects constructors