Sludge Drying Beds 11 55 Sludge Drying Beds 11 Indawo lapho komiswa khona udaka Indawu yokomisa udaka Indzawo lapho kumiswa khona ludzaka Matamo a o omisa seretse Tula ya go omisa seretse Tulo tsa so omisa leraga Ndhawu laha ku omisiwaka ndzhope Fhethu ha u omisa matope Slykdroogbeddings ^
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Sludge Drying Beds 11 - dwa.gov.za · Sludge drying beds Underdrain returns liquid to process Inlet from anaerobic digester ... Sludge Drying Beds 11 The operator dispose of the dried
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Indzawo lapho kumiswa khona ludzakaMatamo a o omisa seretse
Tula ya go omisa seretseTulo tsa so omisa leraga
Ndhawu laha ku omisiwaka ndzhopeFhethu ha u omisa matope
Slykdroogbeddings
^
Sludge drying beds
Underdrain returns liquid to process
Inlet from anaerobic digester
Splash slab
The operator makes sure that the sludge is wastedto the recommended depth of 300 mm
The operator must make sure that the sludge dryingbeds are not filled to the brim
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The purpose of the sludge drying beds
Sludge drying beds are provided to allow surplus sludge that is withdrawn fromthe process to dry for easier handling. Sludge drying relies on an undergrounddrainage system as well as sunshine. Liquid from the underdrains should bereturned to the sewage treatment process for further treatment.
Wet sludgepumped from the anaerobicdigesters
Dry sludgeready for removal
Drying bed not in use
Wet sludge
Sludge Drying Beds 11
The operator should remove the dried sludge fromthe drying beds to make space for wasting sludgefrom the anaerobic digester
If the dry sludge in the drying beds gets wet again,there might be no beds to waste sludge from theanaerobic digester
The operator removes the dried sludge, taking carenot to disturb the top sand layer on the drying bed
The operator calls the supervisor in case the topmedia layers has been disturbed
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Dried sludge
Sludge Drying Beds 11
The different layers of sand, gravel and stone in the bed
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c c c c c c c cccccccccccccccccc c c c c c c c
b b b b bbbbbbbbbbbbb b b b b b
d d d d ddddddddddddd d d d d d
a a a a aaaaaaaaaaaaa a a a a a
c c c c ccccccccccccc c c c c c
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Dried sludge
100 mm Fine river sand
50 mm Pea gravel
75-125 mm Stone
DO NOT disturbthe bottom layerswhen removingthe dried sludge
The operator puts the dried sludge in a designated area forcomposting
Lime
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Sludge Drying Beds 11
The operator dispose of the dried sludge in anexcavated trench. The sludge is then covered with alayer of soil (see page 8)
The operator is responsible for the general upkeeparound the sludge drying beds
The operator takes regular readingsThe operator calls the supervisor when there is aflashing orange light on the board. This is an indicationthat a pump has tripped
The hour metershows the timethat the pump hasbeen working
ON/OFF-switch
The reading must not
be higher than the marked line on the meterIf the reading is higher, switch OFF the pumpand call the supervisor
amp-meter
Red lightnon-working pump
Green lightworking pump
Orange lightpump has tripped
The operator records the various readings on the board
How to read the electrical board
!
ON OFF OFFON
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The operator notes that all the pumps are switchedon, but that one of the pumps switches on/off atirregular intervals. This might be an indication thatthere is an obstruction in the pump. He switches thepump off at the emergency button and then goes to theelectrical board
The operator switches the pump off at the appropriateswitch
The operator reports this to the supervisor The operator removes any obstruction from the non-returnvalve or a pipe bend
!The operator notes that there is excessive waterleaking from the gland or pipe connections(not the normal slow drip from the gland)
The operator reports all leaks to the supervisor
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If there is no flow, it is usually an indicationof a blockage
The operator and supervisor make sure that thereis flow at the inlet and discharge at the outlet
The pump station
GRRRR!!
!The operator notes that the pump is overheating andmaking a noise. He calls the supervisor
Correct flowNo flow
OFFICE
Pump Stations, Electrical Boards, Store Room 13
The operator checks that the water from the leaks runs downthe sloped floor towards the drainage sump. The drainagesump pump removes the water to avoid flooding inside
The operator cleans the floor with clean water
The operator makes sure that the drainage sump pumpis operational. If it is not operational the drainagesump pump and the entire pump station can be flooded
Call the supervisor in case of any emergency
Waste water is usually collected in a sump. The operatorchecks that the sump does not overflow and checks thelevel control installation
The operator hoses and cleans the level control installation
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Pump Stations, Electrical Boards, Store Room 13
!
The sump
OFFICE
The operator cleans the sump and collects any debris. Thedebris is disposed of with the screenable material at theinlet (see page 8)
Do not leave any food stuffs in the pump stationroom
Contaminated food can lead to illness
The operator washes before eating The operator eats in the designated area
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EATINGROOM
Safety tip - No eating near the equipment
BATHROOM
SOAP
Pump Stations, Electrical Boards, Store Room 13
The operator must not wear any loose clothing near thepumps. Operators must button up any loose clothing nearmechanical equipment
Accidents might happen and injuries might occur
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Always keep the store room neat and tidy
STOREROOM
STOREROOM
Coupling coverlying on floor
Button up!
An untidy store room can lead to injury
Hth
Safety tip - No loose clothing near the equipmentCoupling coverlying on floor