Concept and Experiences of wastewater treatment In Cakung Slaughterhouse PD Dharma Jaya - PowerPoint PPT Presentation

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Concept and Experiences of wastewater treatment In Cakung Slaughterhouse PD Dharma Jaya

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Fixed bed digester degrades 70 % of dissolved COD. Over all efficiency of WWTP 80 % of COD-total. Actual condition of wastewater ... – PowerPoint PPT presentation

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Title: Concept and Experiences of wastewater treatment In Cakung Slaughterhouse PD Dharma Jaya


1
Concept and Experiences of wastewater
treatmentIn Cakung SlaughterhousePD Dharma Jaya
  • PUSAT PENGKAJIAN DAN PENERAPAN TEKNOLOGI
    LINGKUNGAN
  • Badan Pengkajian dan Penerapan Teknologi
  • UTEC

2
The 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

3
Concept 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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Table 1. The most important equipment of the WWTP
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The 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

14
Actual condition of wastewater
  • Total amount of wastewater 100 200 m3 /day
  • COD total 6000 8000 mg/l
  • COD dissolved 1600 - 2200 mg/l

15
Figure 5. Mass balance and efficiency of component
16
Fixed Bed Digester Performance
  • Amount of wastewater 353 m³/d
  • Gas production 220 m³/d
  • Methane content 75
  • Amount of sludge 5 m³/d

17
Figure 6. Feeding rate of digester during start
up period
18
Figure 7. Biogas production of digester during
start up period
19
Calculation 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
  •  
  • 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

21
RESUME 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.

22
RESUME 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.

23
RESUME 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.
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