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Friday, April 5, 2019

Causes and Control of Concrete Pipe Corrosion




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Description
Sulfate reducing bacteria that thrive in sewers while reducing sulfur compounds to produce hydrogen sulfide . The hydrogen sulfide eventually escapes from the wastewater into the air space above the liquid, where sulfur oxidizing bacteria oxidize sulfide to sulfuric acid . In order to control the production of sulfuric acid and the corresponding corrosion, we investigated several aspects of the sulfur cycle.

This report consists of three parts. Part I describes the factors that control sulfur reduction in the sewer liquid and slime layers . The bacteriological, chemical, and physical aspects of sulfur reduction is summarized, and laboratory tests performed to measure hydrogen sulfide production rates, and the impact of additives on the hydrogen sulfide production rate . Part II describes an investigation into the microbiology of sulfur reducing bacteria, their growth requirements, and the impact of selected inhibitors on the growth characteristics of these organisms . Part III investigated the mass transfer of volatile compounds (such as hydrogen sulfide or other organic compounds) from the wastewater in a flowing sewer into the gas phase.

Content:-
SUMMARY
PART I. HYDROGEN SULFIDE PRODUCTION IN SEWERS OBJECTIVES AND APPROACH 1. HYDROGEN SULFIDE PRODUCTION IN SEWERS
2. MATERIALS AND METHODS
3. RESULTS AND DISCUSSION
4. SIGNIFICANCE OF RESULTS
5. NOMENCLATURE
6. REFERENCES
7. APPENDIX A. DATA
PART II. SULFATE-REDUCING BACTERIA IN CONCRETE SEWER PIPES MATERIALS AND METHODS
1. RESULTS AND DISCUSSION
2. PROPOSAL TO LA COUNTY ON SRB
3. REFERENCES
PART III. ESTIMATION VOLATILIZATION OF REDUCED SULFUR COMPOUNDS
OCCURRENCE AND SOURCES OF VSCs

1. MASS TRANSFER
2. CALCULATING VSC TRANSFER COEFFICIENTS
3. DESCRIPTION OF THE COMPUTER MODEL
4. REFERENCES

Author Details
"J .B . Neethling"

"R.A. Mah"

"M.K. Stenstrom"




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