Title: Concept and Experiences of wastewater treatment In Cakung Slaughterhouse PD Dharma Jaya
1Concept and Experiences of wastewater
treatmentIn Cakung SlaughterhousePD Dharma Jaya
- PUSAT PENGKAJIAN DAN PENERAPAN TEKNOLOGI
LINGKUNGAN - Badan Pengkajian dan Penerapan Teknologi
- UTEC
2The main functional areas of Cakung Slaughterhouse
- ü Stabling of cattle
- ü Slaughtering in main slaughterhouse
- ü Slaughtering in traditional slaughterhouse
- ü Power supply, workshop
- ü Administration
- ü Sanitary facilities
3Concept of the Wastewater treatment
- Low running costs, means low demand for
manpower, - energy and chemicals, even if the
investment cost might - be higher
- Simple and clear operation procedure to
simplify the work - for operators and minimize the risk of
miss management - Minimization of sludge production and
demand of sludge - handling
- Utilization of renewable energy and
nutrients -
- Energy production in form of biogas
and current production as - benefit
- Utilization of sludge in composting
process
4 Figure 3. The system plan for waste and
wastewater treatment process
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6Table 1. The most important equipment of the WWTP
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13The main requirements
- Step screen eliminates suspended solids gt3 mm
particle size - Fine screen separates suspended solids gt1mm
particle size - Pre-sedimentation eliminates gt90 of suspended
solids - Fixed bed digester degrades gt70 of dissolved
COD - Over all efficiency of WWTP gt 80 of COD-total
14Actual condition of wastewater
- Total amount of wastewater 100 200 m3 /day
- COD total 6000 8000 mg/l
- COD dissolved 1600 - 2200 mg/l
15Figure 5. Mass balance and efficiency of component
16Fixed Bed Digester Performance
- Amount of wastewater 353 m³/d
- Gas production 220 m³/d
- Methane content 75
- Amount of sludge 5 m³/d
17Figure 6. Feeding rate of digester during start
up period
18Figure 7. Biogas production of digester during
start up period
19Calculation of current production
- Power output 35 kW
- Gas uptake 15.6 m³/h
- Gas production 220 m³/d
- Current production 495 kWh/d
20- Balance of demand and production
- Demand 122 kWh
- Production 495 kWh
- Surplus 373 kWh
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- Benefit
- The benefit from electrical generation by Biogas
is - Current tariff (December 2002) 578.00 Rp/kWh
- Surplus current 373 kWh
- Benefit 215,541 Rp/d
- 6,466,218 Rp/month
21RESUME I
- The presented system is very suitable to treat
the wastewater from slaughterhouse and stable
area. - - All components of the plant are dimensioned by
hydraulic load and flow rates. Therefore it is in
general very important to minimize the amount of
waste- water to reduce the size/capacity of
equipment and investment costs.
22RESUME II
- - The volume of the storage and mixing tank
might be chosen smaller, because the fixed bed
digester is able to handle discontinuous flow,
furthermore it was found out that a part of
dissolved COD is already degraded during the
storage time. The consequence is a lower
production of biogas. - - The digester is dimensioned for minimum
hydraulic retention time of 3 days. It might be
possible to reduce the minimum retention time to
less than 2 days. High load tests showed that
the digester is very flexible and is able to
handle shock loads.
23RESUME III
- - The final sedimentation eliminates only 0,5
of pollution, but is an expensive component. It
might be suitable to drive a system without final
sedimentation. - - In general very important to increase the
amount of slaughtering of cattle to increase the
performance of wastewater treatment plant.