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Invitation for Proposal for the Rehabilitation of the Existing Sewage Treatment Plant

 

TERMS OF REFERENCE

SCOPE OF WORK

The scope of work consists of the following:

  1. Process design, process engineering and process equipment for the rehabilitation of the existing sewage treatment plant with design capacity as indicated in the Basis of Design. The treatment facilities shall be capable of reducing the Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), pH and 0/G to meet the Dept. of Environment & Natural Resources (DENR) prescribed effluent standards. The existing system is a SEQUENCING BATCH REACTOR SYSTEM.
  2. Engineering design incorporating related disciplines from process, electro-mechanical, controls and instrumentations.
  3. Prior to the installation of new equipment and accessories, the rehabilitation shall include but not limited to the following:
  4. Desludging and cleaning of all existing tanks,
  5. Dismantling of all existing equipment
  6. Minor civil works and painting
  7. Supply and installation of all electromechanical equipment, piping work, electrical and instrumentation controls and wirings. Where applicable and feasible, the re-use of existing equipment and attendant accessories shall be considered.
  8. Testing of process equipment and start-up of the sewage treatment plant and its appurtenances using clean water (owner supply).
  9. Preparation and submission of three (3) sets of operation and maintenance manuals. The manual shall include a list of suggested spare parts, equipment suppliers complete with address, telephone and contact person(s).
  10. Provision of at least one month hands on training to Client-assigned operators after acceptance by the Owner/Owner’s Representative. The rehabilitated plant shall have ran continuously for two (2) weeks within the desired parameters with no upsets and with minimal human intervention.
  11. Submission of two (2) sets of as-built drawings (signed and sealed).
  12. Assistance in the application and processing of sewage treatment plant’s DENR “Discharge Permit” with Department of Environment & Natural Resources (DENR). All requirements for the application of the Discharge Permit shall be submitted and provided by the Client as per checklist provided by the contractor.

The process and equipment design of the proposed sewage treatment plant shall be based on the following recommended design criteria and parameters:
BASIS OF
THE DESIGN

  1. Design Flowrates

Parameter

Unit

Value

Design Capacity

m3/ day

160

  1. Influent Characteristics

Parameter

Unit

Value

Biochemical Oxygen Demand, BOD5

mg/L

190

Chemical Oxygen Demand

mg/ L

210

Suspended Solids

mg/L

50

pH

 

6.92

Oil and Grease

mg/L

1

*

 

 

PERFORMANCE GUARANTEE

The STP Contractor guarantees that the performance of the STP will meet the DENR set standards at all times. This guarantee is valid only if all the design parameters and flowrate are strictly observed at all times.

 

Parameter

Unit

DENR Effluent
Standards

SBR System
Effluent Quality
for water reuse

Biochemical Oxygen Demand, BOD5

mg/L

Less than 50

Less than

Chemical Oxygen Demand, COD

mg/L

Less than 100

Less than 70

Total Suspended Solids

mg/L

Less than 70

Less than 10

pH

 

6.5 – 8.5

6.5 – 8.5

Oil and Grease

mg/L

Less than 5

Less than 5

Note: The treated water can be reused or recycled for irrigation and watering, or for other non-potable purposes.

SEWAGE TREATMENT PROCESS DESCRIPTION

The proposed sewage treatment plant (STP) will consist of physical and biological treatment processes. The sewage treatment facility consists of screening, influent tank and grease trap, sequencing batch reactors, chlorine contact chamber. The sludge treatment will consist of aerobic sludge digester.

  1. Manual Bar Screen

Incoming sewage enters the bar screen by gravity. Raw sewage which contains large objects over than 1/2 inch will be removed by screening. A manual rake shall be provided for cleaning purposes.

 

  1. Influent Tank and Grease Trap

The sewage will flow by gravity into the influent tank. The influent tank will balance the wastewater flow and equalize the incoming sewage before it enters the SBR tank. The tank is also provided with two (2) transfer pumps, acting on duty and standby, to pump sewage to the secondary biological treatment process, the sequencing batch reactor.

 

  1. Sequencing Batch Reactor (SBR)

The SBR process is an activated sludge process popularly used today. It is a biological waste treatment system that operates by batch and allows large number of suspended microorganisms to biodegrade the organic matter and convert them to useful and stable gases such as carbon dioxide, nitrogen and water under various conditions i.e. aerobic, anoxic and anaerobic. It combines carbon oxidation and nutrients removal (i.e. nitrification and de-nitrification) in one same reactor ensuring complete biological treatment of wastewater and preventing odor problem. The SBR reactor/s are usually equipped with non clog air diffusion system that provide superior mix-oxygen transfer rate.

The basic modes of operation in the sequencing batch reactor are FILL, REACT, SETTLE, DECANT and IDLE. Other advanced sequencing mode options are also available The biological process allows organic pollutants to undergo a complete reaction cycle, from aerobic oxidation to anaerobic degradation.

  1. Chlorine Contact Chamber

Treated wastewater is then efficiently decanted from the SBR reactor/s and disinfected with simultaneous dosing of a 7% sodium hypochlorite solution. The design of the disinfection chamber provide adequate contact time to kill-off pathogenic microorganisms and coliform.  The sodium hypochlorite solution shall be filled in day tank and pumped by chemical metering pump. The chlorine dosage rate ranges from 2 mg/L to 4 mg/L.

  1. Aerobic Sludge Digester

Excess sludge is pumped from each SBR to the aerobic sludge digester by a sludge waste pump. The tank shall be aerated by a positive displacement blower through non-clog air diffusers. After digestion, the volume of volatile suspended solids (digested sludge) shall be reduced/oxidized to stable forms by about 40 to 50%. Digested sludge shall be disposed offsite by accredited DENR hauler.

  1. PLC Control System

The operation of the process equipment as well as the biological process controls are carried out with a programmable logic controller (PLC) installed inside a NEMA control panel enclosure. Also, the PLC is designed to detect any equipment failure and will set off corresponding alarms. A Reset button is provided for easy restart, it will automatically take action for the system to resume operation using the remaining basic/equipment as programmed in the PLC. The unit control of each equipment is also provided with a manual override for auto/ manual controls.

ADVISORY:

Please be informed that Baguio Country Club and Celebrity Sports Club do not have any reciprocity agreement nor is Baguio Country Club an offsite destination of Celebrity Sports Club. 

“Obra ni Nene II” Painting Exhibit

Join us for the opening of “Obra ni Nene II” painting exhibit on Oct 12, 5PM, at the Club’s lobby. These paintings are made by Cribs Foundation, Inc’s new beginnings and after-care girl survivors. All acrylic paintings are up for sale & proceeds will go directly to the artist & the legacy funds to support the continuity of the Therapeutic Art Classes. Exhibit will run from Oct 12-28, 2018. See you there!

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Fitness Gym closure

ADVISORY: The Fitness gym will be temporarily closed from Oct. 1-7, 2018 for facility improvement. We apologize for any inconvenience.

Space for Lease

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Members’ Night for September

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Be entertained with their music from the 60’s up to the 80’s and let your feet do their thing on the dance floor! ….. Spirit of 67, the retro band for your retro fun!

Catch them live on Sept. 14 at the Club’s Members’ Night.

Members’ Night for August 2018

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July Members’ Night / Anniversary celebration

lampost 2_42 x 60 inches

Sports Events (June – December 2018)

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Advisory on Trunk line upgrade

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