Presentation on theme: "Results of BOC’s Fog (Fats,Oils,Grease) Reduction Program at a WWTP-62 MGD (234,696 m 3 /Day)"— Presentation transcript:
Results of BOC’s Fog (Fats,Oils,Grease) Reduction Program at a WWTP-62 MGD (234,696 m 3 /Day)
BOC GOAL To prove EcoCatalyst ® would solubilize incoming influent fog’s, along with the daily grease trucks (14 to 18 per day). Most significantly, reduce fog’s that have accumulated on the bar screens, wet wells, grit building plenum, distribution box, primaries (flight and chains),etc. BOC FOG reduction demonstration program ran 11/04 thru 11/17/05.
The Influent Loadings Conditions Average influent CBOD 5 is 230 mg/L. Influent flow averaged was 62 MGD (234,696 m 3 /Day). Peak flows of 77-82 MGD (291,477- 310,404 m 3 ) occur between 12 to 5 pm daily. Truckloads of outside Fog’s are received from 7:30AM to 4:30 PM Monday thru Friday. Aver number trucks received per day was 13.85, with a peak number of 18. The aver. GPD (m 3 ) of Fog’s was 35,381 GPD (134 m 3 ), with a peak of 40,800 gpd (154 m 3 )
The average: mg/L of FOG’S is 511.The peak loading is mg/L is 590. The incoming truck Fog loading does not reflect measurement of incoming influent mg/L of Fog’s which is normally 50 to 80 mg/L
EcoCatalyst ® Injection Method EcoCatalyst ® was injected directly into the influent well from 11/4 thru 11/14. EcoCatalyst ® was injected by a single speed chemical feed pump. The feed rate was ~.2 ppm or 12 gpd (45.4 Lpd). ~ 20 gallons were used to pre-treat the wet wells and grit building plenum.
Nassau County Bay Park, NY WWTP- BOC FOG- Reduction program demonstration- 11/04/05 Thru 11/17/05 Secondary Settling Treated Water Discharge Influent (60-80 MGD) Screening Grit Chamber Building Primary Settling Aeration Blower Aeration Blower Sludge Storage Anaerobic Digester To sludge belt press and land application Bio-Organic Catalyst Injection Return \ Sludge Wasted Sludge Power Generation Aeration Tanks BOC Injection Point Wet Well Distribution Box FOG Tanks 1 234 5
The Bar Screening Equipment There was 1 inch build up of encrusted FOG on the stainless steel support shafts, sprockets and chains This build–up requires constant cleaning and must be maintained to prevent jumping of chains over sprockets. 2
Bar Screening Equipment-the “Before” on11/4/05 Note-The build-up of FOG on support shafts and equipment
After only 4 days of BOC treatment-11/08/05 Note: The cleanup of support shafts
Condition Of Wet Well The 15’x 15’ wet well was encrusted with built up fog’s. There was layer of fog’s coating the walls 14” to 18” thick and 24 to 30 inches deep. On the surface there was layer of fog ~ 4 to 6 inches thick with a free surface water flow in an area ~,24” wide by 24 inches long. The various stand pipes were severely encrusted with fog’s. 3
Wet Well 11/4-There was layer of fog’s coating the walls, 14” to 18” thick and 24 to 30 inches deep. NOTE: The encrusted fog’s around the stand pipe.
Progress In Wet Well Four Days Later on 11/08) NOTE: The encrusted fog’s. around the stand pipe are gone.
Wet Well Walls 11/4-There was layer of fog’s coating the walls 14” to 18” thick and 24 to 30 inches deep.
Wet Well Surface On 11/4-Note the layer of fog’s ~ 4 to 6 inches thick coating the well surfaces.
Progress in Wet Well after four days- on 11/08 Note: The cleanup of well surfaces and the diminution of fog’s on the side walls.
Progress In Wet Well 7 Days Later, on 11/11 Note: The cleanup of well surfaces and the diminution of fog’s on the side walls.
The Conditions In Grit Building The grit/gravity thickener plenum is ~ 90’ long x 8’ wide x 6’ deep. The grit/gravity thickener plenum is ~ 90’ long x 8’ wide x 6’ deep. The plenum was severely impacted with fog build up. The plenum was severely impacted with fog build up. The fog build up began ~ 10’( 4-6” thick) to the left of the center tank bridge work, extending to the far right tank ~ 45’ to the wall(16 to 24” thick). The fog build up began ~ 10’( 4-6” thick) to the left of the center tank bridge work, extending to the far right tank ~ 45’ to the wall(16 to 24” thick). 4
Gravity Thickener Plenum-The Beginning On 11/4- Far Right Tank Fog’s have severely impacted the plenum and are 16 to 24” thick.
Comparison of Progress in GRAVITY THICKENER PLENUM -7 DAYS LATER ( 11/11) 11/4- Note the encrusted fog’s. 11/11 The majority of fog’s are solubilized,but built up ledge still exists
PROGRESS IN GRAVITY THICKENER PLENUM 11/14-The majority of fog’s are solubilized and the built up ledge surrounding the access ladder is becoming smaller. The ledge was spot treated with EcoCatalyst ®. 11/17- Top view of access ladder after spot treatment
11/17- Note Incoming Fog’s and their re- accumulation after EcoCatalyst ® treatment ended on 11/14
On11/28-Note the re-accumulation of FOG’s in Gravity Thickener Plenum- far right tank Product injection ended 11/14, note the fog build up in two weeks!
Progress in Gravity Thickener Plenum- center tank 11/4-View ~ 10’ Left of center tank. Note fog build up 11/11- 7 days later
Flow Distribution Box To Primaries 11/4-the box was severely encrusted with fog’s with very little free flowing water. 11/11-the box opened up much like the front of the primary influent gate or grit building plenum. 5
Primary Influent Gates The primary influent gates were encrusted with fog’s. There was layer approximately 10” to 12” thick in front and rear of the gates. In the front, there was some free water flow in an area, 3” wide by 4 ” inches long. The rear of the gates were severely encrusted with very little free flowing water.
The “Before View” - Front view of Primary Influent Gate- 11/04/05 The Fog build up is 10 to 12 inches thick and had some free water flow in an area approx.,3”wide by 4” long.
Progress After 4 Days-The Front Of Primary Influent Gate-11/08/05
Progress After 6 Days -The Front Of PRIMARY INFLUENT GATE- 11/11/05
The “After” Of The Progress At Front Of Primary Influent Gate-11/14/05 The Fog build up is almost completely gone!
The Start-The Primary Influent Gate-Rear View on 11/04/05 The rear of the gates were severely encrusted with very little free flowing water.
Progress After Four Days At The Rear Of Primary Influent Gate- 11/08/05 The rear view of the gate, It is beginning to loosen up and to have free flowing water.
Progress At The Rear Of Primary Influent Gate- 11/11/05 The build up at the rear of the gate is beginning to loosen up and BOC is solubilizing the Fog’s
PROGRESS AT THE REAR OF PRIMARY INFLUENT GATE- 11/14/05 The rear of the gate has loosen up and note the free flowing water
Fog Build Up On Primary Flight Drive Chains And Sprockets There was a build up of fog’s on the primary drive chains and sprockets. This build up is generally indicative of fog’s covering primary, flights,walls,surfaces and rotary dunking discharge valves. This build up can lead to the electrical limit switch to stop the flight chain drive motors creating a maintenance condition. Or can cause the chains jump the sprockets which can lead to broken primary chains or flights.
The “Before” Of Primary Flight Drive Chains And Sprockets-11/4/05 Note: This build up of fog’s on chains and sprockets was typical condition of all the primary’s
After 7 Days,NoteThe Cleanliness Of Primary Flight Drive Chains And Sprocket-11/11/05
BOC Product Injection Ended On 11/14/05, 3 Days Later There Was Fresh Fog Build –Up On The Chain And Sprockets On 11/17/05
The “Before” Condition Of Primary Tanks, Flights, Effluent Discharge, And Effluent Weirs The primary tank surfaces were covered with large particles of fog’s. The primary flights were encrusted with fog/bio- film build up. The rotary dunking valves were encrusted with fog build up of 2-3 inches thick. The effluent discharge weirs were covered with a fog/bio-film build up.
11/04/05 -The “Beginning”- The Primary Tank Surfaces Were Covered With Large Particles Of Fog’s.
The Primary Flights Were Encrusted With Fog/Bio-film Build Up. 11/04/05 The “Before”, Note: The Fog/Bio film build up 11/14/05 -The “After” The removal of the Fog/Bio film build up- 11/14/05
Primary Rotary Dunking Valve Effluent Discharge The “Before picture” of the rotary dunking valve which were encrusted with fog build up of 2-3 inches.- 11/04/05 The “After picture” of the rotary dunking valve. Note: The beginning of the cleanup of valve and the clear water behind it. Also, the scum/fog layer has been reduced to ½ inch. - 11/11/05
Primary Rotary Dunking Valve Effluent Discharge On 11/04/05,the scum/fog line was typically 1-2 inches thick and extended 5-7 feet toward the point where the flight would submerge. 6 days (11/11/05) later, this was typical reduction in thickness of the scum/fog line. The scum/fog layer had been reduced to ¼ to ½ inch and the length in front of rotary was reduced to 2 to 3 feet.
Primary Effluent Weirs On 11/4/05,the beginning, Note the FOG/Bio-Film build up. Note:7 days later, the beginning of the cleanup of FOG/Bio-Film build up on the weirs
Bio Film /Fog Deposits On Walls And Dunking Valves Of Final Contact Tanks- 11/14/05 PLANT EMPLOYEES REPORTED THE ½ TO ¾” BUILD UP WAS GONE !
OBSERVATIONS The incoming fog truck loading is very high, ( 2.5 to 5 times more) as compared other plants in the tri-state area.(NY,CT and NJ) Based on our experience, we expect that the difficult area ( the wet wells, primary’s, grit building, distribution boxes) could be solubilized in 3-5 weeks, without employee labor for mechanical clean up ( Vac trucks, fire hoses, etc.
After this clean out period, the EcoCatalyst ® injection daily injection rate would be optimized (lowered) to a maintenance dosage ( 4-8 GPD). The most cost effective injection of EcoCatalyst ® would be to use a two speed pump flow paced to the incoming loads of fog’s, i.e. A faster injection rate from 7 am to 5 pm.And a minimal rate for the balance of the 24 hours.