Sewer is one of the largest Wastewater Problems. Remote Locations create Problems - Here is a Solution

By Bjorn Sundbakken
February 1999

The Author is the President of Environmental Equipment Consulting & Production Inc. (EEC) in Newport Beach, USA

How can small Local Communities, Island, and Industrial Plants unload from existing Sewer Plants (if any), enhance the Environment and Recycle the Water?

If you are located in a remote area with no sewer system and strict regulations, the cost of hooking up to municipal sewer lines will be astronomical, or maybe even impossible. The next choice is to build your own biological plant, this can be expensive and time consuming, and you have to comply with strict regulations. With this in mind, EEC has developed compact containerized Bio plants that is fully automated and will meet or surpass any effluent standard.

These Biosystems are able to handle 10 times the loading in 1/5 the time compared to activated sludge systems. This will allow Industrial plants, Schools, Camps, Hotels, Military, Resorts, Golf Courses, and local, or remote communities to treat their own sewer or waste economically. These ready to be operated systems allows remote communities to have their own plants for a fraction of the cost compared to conventional industrial or municipal plants. The effluent water can be used for irrigation and / or be recycled for other purposes. Sludge will be neutralized and used as fertilizer.

EEC recently signed a one million-dollar contract for nine (9) such systems with the Fil-Estate Group, the largest land developer in the Philippines. One of Fil-Estates latest developments, "Forest Hills" a Golf Course designed by "Facio", has nine condominium complexes spread around this Golf Course. Each outfall will be treated separately with a compact biosystem from EEC.

These systems offer a perfect solution for this and similar project, as one of Fil-Estate's engineers said, "This is a win, win situation for all. We will save on engineering time, construction time, cost and footprint of these systems is much less compared to ordinary activated sludge systems. The EEC systems also allow irrigation directly from each outfall. Now we can offer our clients an economical solution and a clean environmental community, the water can be recycled, we love it".

EEC is using a proprietary media that offers up to 850 m² per m. The systems are clog-free, not sensitive to bio "up-set" (causing activated sludge systems stop function and thereby polluting the ocean). These compact Biosystems are becoming more and more popular and have been purchased by large companies like "Bechtel Engineering", and have been delivered to a wide variety of industries with biological waste problems.

General Description of the EEC HS BIO-TEC Condominium Sewage Treatment Plant

The EEC Condo STP system is based on the EEC High-Speed Bio-Tec biodegradation and sedimentation technology which is unique due to its compactness and performance in respect of volumetric efficiency. These technologies are combined in a prefabricated, skid mounted and standardized tank system with variable length, suitable for overseas transportation in ISO freight containers.

Standard systems are designed for indoor location in closed rooms with draft ventilation. Smaller systems may be placed outdoor under shelter with natural ventilation. Since the systems are excessively aerated, the smell caused by anaerobic rotting is negligible.

  1. Dimensional Criteria
    Any treatment plant should be based on actual measurements of the waste stream to be treated in respect of hydraulic load, suspended and dissolved organic material, and the applicable local effluent requirements. However, sufficient statistical information is available for small community municipal waste waters, related to the term "Person equivalents" Pe.
    A system specifically designed for condominiums and smaller residential areas, this plant is based on the following data:
    Waste water flowQw114 l/ Pe/ day30 GPD/Pe
    Suspended solidsTSS60 g/Pe/ day.13 #/day/Pe
    Organic matterBOD40 g/Pe/ day.09 #/day/Pe
    NitrogenN7 g/Pe/ day.015#/day/Pe
    PhosphorousP.6 g/Pe/ day.001#/day/Pe

  2. Capacities
    The Condo STP system is manufactured in lengths of 2 feet increment in order to suit any particular need. The basic 15', 21', 27', 33' and 39' length systems with 3 chambers, have following nominal capacities at a guaranteed effluent of 30 ppm BOD as daily average:
    Model15CON321CON327CON333CON339CON3
    Capacity400 Pe600 Pe800 Pe1000 Pe1200 Pe
    For a 2 chamber systems with a guaranteed effluent of 80 ppm BOD as daily average, the capacities are:
    Model15CON221CON227CON233CON239CON2
    Capacity600 Pe900 Pe1200 Pe1500 Pe1800 Pe
    Systems with requirement to effluent COD will normally require longer retention time and will consequently have lesser capacity then above. Such systems will be designed as customized systems based on the customers influent analysis.
     
  3. Pre-Sedimentation System
    It is assumed that the sewage piping system ends in a customer provided three-chamber combined sedimentation/buffer/pump well tank system which separates paper, sanitary binds and settleable solids. The buffer capacity must be sufficient to level out the daily peak flows. The combined holding capacity of the system should be 12-16 hours, depending of the flow profile. 5/8 of the volume is for primary sludge sedimentation, 2/8 of the volume is for secondary sedimentation and 1/8 is for the pump well. The total buffer capacity is 1/2 of the total volume, the remaining is for sludge storing.
     
  4. Biological Treatment System
    The treatment plant will take suction from the pump well by its own feed pump. The pump is level controlled and has a capacity which is 2-3 times the average daily flow. The plant has therefor an intermittent working mode in terms of hydraulic flow, while the air blower supplying air to the bioreactors is continuously running.
    The biodegradation reactor comes in one or two stages depending on required cleaning efficiency. Plants with higher cleaning efficiency than 80-85 % need a two stage system. The bioreactors are degrading the dissolved organic matter by oxidation into carbon dioxide which escapes to the air, and to produced biomass which act as activated sludge. A suspended, free floating biofilm carrier medium is providing a large, protected biofilm surface as host for the bacteria and is simultaneously accumulating the active biosludge inside the reactors.
    The biodegraded water is flowing into a clarification stage where the suspended solids settles by gravity. The water is directed through a skim well to a plate settler system which provides the final clarification of the effluent For systems with high cleaning efficiency, the sedimentation may be enhanced by addition of polymers.
     
  5. Sludge Separation System
    The sludge pump is activated each time the feed pump stops, with suction from the clarification stage. The pump is discharging through a hydrocyclone with the overflow back to the bioreactor, while the underflow is discharged to the primary sludge storage. When necessary, the sludge is emptied by a vacuum truck and hauled away for external treatment.
     
  6. Equipment Specification
    The basic system comes with following standard equipment:
    • A mild steel tank consisting of a framework of square pipes and vertically stiffened sides and partitions. The tank is internally coated with tar epoxy and externally painted in white with EEC name and logo in one feet high letters on two sides.
    • A free floating plastic biofilm carrier medium in each bioreactor. 2/3 filling rate as standard, with 100 square foot biofilm surface per cubic foot reactor volume.
    • A plate separator system of 60 degree inclined PVC plates in the settling tank. Three plates per foot length, projected area 5 square foot per square foot tank surface.
    • One separate drive regenerative blower with air header in galvanized steel and air distribution system in stainless steel. Air filter/silencer on the blower inlet, muffler on the outlet for flow regulation.
    • Two open impeller, stainless steel, close coupled centrifugal process pumps with carbon/ceramic mechanical seal and viton elastomers. Waste water pipes in galvanized steel and/or PVC as required.
    • One multifunction chemical dosing pump for foam control during start up, pH adjustment or nutrient supply as required. Normally, none of these functions are required when the system is stabilized.
    • One main electrical switchboard/control panel with start/stop buttons and running lights. Automatic start/stop of process pump on high/low level

  7. Features
    • Self-Cleaning non-clogging media with 20 years warranty
    • 10 Times the Loading in less than 1/5 the time
    • Easy to Relocate and Install
    • Water can be used for Irrigation
    • Fully Automatic and easy to Operate

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Copyright © 1999, ECO Services International