Septage Treatment Plant, Brgy. San Roque Baliwag, Bulacan, Philippines

Scale of service	City  level	Area of installation	2800 m2
Inlet	Faecal sludge / Septage	Outlet	Treated Water / Soil conditioner
Year of Installation	2013	Designed capacity	30 KLD
No. of Users/people affected	28347 Residential Households & 636 Commercial and Institutional Establishments	Construction and O&M responsibility	Baliwag Water District

Location of the technology:

The Septage Treatment Plant is located in Brgy. San Roque, Baliwag in Bulacan province of Philippines. This city is located in the western part of the Bulacan province and is 50 kms from Manila.

Need for technology

To provide sanitation service within the service area in the form of septage management system in the most cost effective, healthy work environment and environmentally responsive method.

System description

 

1. Bar Screening:  Remove / traps big trashes. Trashes are racked out into bags for final disposal
2. Maceration: Grinds / cuts trash that are fed into the rotating cutters into smaller size allowable to screening section.
3. Primary Screening: Solid particles are removed, washed and compacted by two mesh rotating screens. Compacted solid particles are dropped into waste bins while free oil and grease are skimmed by an integrated oil skimmer and stored in a separate container for disposal.
4. Holding Area: A storage tank holds and equalizes the screened water to attain a uniform quality or consistency before it is pumped out to the flocculation process.
5. Sludge thickening: The slurry is mixed with a sludge thickner (polymer) to separate water from solid parts. Solid particles agglomerate and bind with each other and increase their size so that they can be filtered or removed easily during the separation process. Also known as solid-liquid separation process. After the addition of the polymer, thickended sludge is pumped to a scres press tp separate water from sludge. Sludge is pushed to a filter screen. Filterate water passes through small passage while leaving the solid particles behind. These either go to the sludge treatment tank or directly to a bagging system for disposal.
6. Equalization tank: Water coming from the screen press is temporarily held to allow mixing to attain a uniform quality before it is pumped to the SBR initial aeration.
7. Aeration (Sequential Batch Reactor): Introduces air (oxygen) from a blower through the submerged diffuser. It supports the activities of the bacteria for efficient consumption of biochemical-oxygen demand (BOD).
8. Decantation: After aeration, the aeration tank is put to idle and allows the solids to settle down. The clear water at the upper portion is then pumped out using a decanted and sent to disinfection tank.
9. Disinfection (Chlorine Dioxide Contact Tank): Biologically Treated water from the SBR (biological treatment) gets in contact with Chlorine Dioxide for disinfection. Bacteria, viruses, pathogens are oxidizer chlorine dioxide without leaving toxic residues that may harmfully affect marine life.

Effluent Holding Tank: Treated and disinfected water is held and discharged to either recycled water tank or directly to irrigation canal.

Contact:

Engr. Ma. Victoria E. Signo

Manager - Sewerage and Sanitation Division

Baliwag Water District

Landline: +6344-766-2618