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Plant Trouble-Shooting chart <br /> Equipment Aeration Tank Settling Tank Effluent Comments and Corrections <br /> Operation <br /> 1. All Air bubbles rising. Surface clear to a Clear,sparkling. All good-continue same <br /> equipment Little or no foam. depth of 18 or more No solids. More operation <br /> operating 20%-50%solids. inches. than 1 ppm Q.O. <br /> properly More than 1 ppm <br /> D.O. <br /> 2. Same Few or no air Dark and murky Murky. Odor. High Check for major air leaks. <br /> bubbles rising. solids Check pressure gauges. When <br /> Black color. No corrected aerate continuously <br /> D.O. until proper color and D.O. <br /> return.Then return to time clock <br /> operation <br /> 3. Equipment Same Same Same Check for: power outage,fuses <br /> not operating blown-replace. Reset circuit <br /> (Check time breaker. Motor overloaded- <br /> clock first-may push reset button. Check <br /> be on "off'cycle overload heaters if reset does <br /> not start motor. Check V-belt <br /> drive <br /> 4. All Air bubbles rising. Murky, no visible Murky, high solids Over aeration-plant is running <br /> equipment Too much foam. sludge blanket. too much. Reduce running time <br /> operating 5%-15% solids. Floating sludge in to minimum necessary to <br /> Murky supernatant, some areas maintain brown color. Common <br /> poor separation of during start-up period. Use <br /> liquids and solids. commercial defoamer if <br /> necessary. <br /> 5. All Air bubbles rising. Murky, large Murky. High solids Probably due to inadequate <br /> equipment 10%-25%solids. 1- chunks of floating sludge return -scrape tank more <br /> operating 3 ppm D.O sludge often-check return pump <br /> properly (should be returning 1/3 pipe <br /> full). (See Special Maintenance <br /> Section)Also, see Item 4 on <br /> check list <br /> 6. Same Air bubbles rising. Clear at surface, Not murky. May be due to excessive sludge <br /> 20%-50%solids. 1- visible sludge Excessive solid return and/or skimming (See <br /> 3 ppm D.O blanket 12"or so particles. D.O. Special Maintenance Section). <br /> below surface approximately 1 Possibly due to inadequate <br /> ppm return(See Item 5). Also may <br /> check B.O.D. and flow-plant <br /> may be overloaded <br /> 7. All Same Much floating Clear, no solids. May be due to clogged or <br /> equipment material D.O. more than 1 improperly set skimmer-adjust <br /> operating ppm or unclog. (See Special <br /> properly except Maintenance Section) <br /> skimmer <br /> 8. All Same Same as Item 5 Same as Item 5 Probably due to clogged sludge <br /> equipment return-check air supply lines <br /> operating (See Special Maintenance <br /> properly except Section). <br /> sludge return <br /> um <br /> 9. Equipment Same as Item 2 Same as Item 2 Same as Item 2 Possible failure of time clock- <br /> will work on have electrician check. <br /> manual but not Overload may be released-push <br /> on automatic reset buttons <br /> 10. All Air bubbles rising. Murky. Brownish- Murky. Excessive Possible excessive amounts of <br /> equipment Yellow foam, yellow floating solids grease coming into aeration <br /> operating grease balls. No greasy sludge. tank-check to assure removal of <br /> properly D.0 Excessive grease grease before it gets to the <br /> plant. <br /> c,/okn-irouhle-;hoot(wade-i-2 <br />