ENVIRONMENTAL WATER TREATMENT SYSTEMS
Environmental Wastewater Treatment Systems provides engineering, manufacture and installation for advanced, environmentally improved wastewater treatment systems using the Stahlermatic technology developed in Germany.
AWARD WINNING
The Society of Professional Engineers of Puerto Rico
(CIAPR) gave the "Outstanding Engineering Project of 1994"
to a Wastewater Treatment Plant using the Stahlermatic
Design. This was the first time in the history of the award that>
a wastewater treatment plant had been so honored. The plant>
has been operated by the Palmas del Mar Utility Corporation,
Palmas del Mar Resort in Humacao, Puerto Rico, for the
past ten years.
The same installation technology was given EPA's
Region II Award in 2004 for Outstanding Technology combining water treatment and
composting
NEW ENGINEERING CONCEPTS
Usually wastewater treatment plants are designed to comply to>
discharge standards and treat the product as waste. The concept of
wastewater treatment plants becoming instruments capable of
producing goods with economic value instead of waste while at the
same time providing the appropriate treatment is creating a new
approach in the wastewater industry in Puerto Rico and elsewhere.>
COMPOST
All treatment plants generate solids. The reality is that a
treatment plant is a great solid waste concentrator machine. The
more solids that we concentrate and dispose of, the better the
water effluent. This system uses the yardwastes (palm fronds,
coconuts shells, grass clippings, & shredded tree branches) in
combination with the generated stabilized biosolids in a open
windrow compost process to convert the same into soil conditioners.
The compost process is very simple but effective and occurs in
drying beds with very simple machinery, instead of using systems
for forced aeration and a sophisticated covered building.
The 200 cubic meters of material processed per month save
$60,000/year in yardwaste and dry sludge disposal expenses.
Savings in fertilizer purchases are in addition and are still
being compiled. The composting follows procedures of the
US Clean Water Act - CFR 40 Section 503 where windrows are
turned at least five (5) times in a fifteen (15) day period
uses a one (1) acre area for mixing and yardwaste processing
and another acre for curing. The curing takes 12 weeks and
it is stored for landscape applications in projects at the resort.
HIGH IN ENERGY CONSERVATION
Conventional treatment plants are great energy consumers.
One of the greate operational expenses is energy.
The Palmas del Mar system has been using with excellent
results the Stahlermatic submerged biological rotors that
allows energy efficiency in the biological stages.
This treatment plant has been processing with
a constant efficiency of 0.20 kWh for each Kg of BOD5 reduced.
If the treatment plant operates at peak capacity,
this ratio will be reduced to 0.05 kWh per Kg of BOD5 reduced.
In comparison, conventional activated sludge processes
need at least 1.5 kWh per Kg of BOD5 reduced.
MORE EFFICIENT TREATMENT
The Stahlermatic rotors combine activated sludge
and fix film processes in the same tank, This combination
of processes permits the volumetric load to attain the range
of 1.4 to 2.0 kg BOD5 for every cubic meter inside the reactor.
In comparison, the more common activated sludge process
used in the industry today uses 30 to 60 kg BOD5 per cubic meter.
Thus, the Stahlermatic combination of systems produces efficiency
increases of 273%. The means to achieve such high treatment
efficiency at low energy demands is by using submerged rotor aerators (SRA).
The Palmas del Mar treatment plant uses nine (9) such rotors
of four (4) meters diameter that are 3/4 submerged.
The 2.5 meter wide cylinder consists of pipes connected
to a metal frame wheel joined together by the pipes and the axis.
The axis never needs to be lubricated since it always remains submerged.
The pipes have slots that capture oxygen from the atmosphere
that escapes at the bottom of the tank due to the pressure
created by the water depth. The wheel is moved by a small
direct drive electric motor with a low gear transmission and
a 3.5 kWh connected load. Transfer from motor to rotor is
by a metal chain surrounding the outside edge of the wheel
which provides an excellent leverage and low torque demand.
Fix film surface area is created on propyline plastic media
located inside the periphery pipes. The (9) wheels produce
1.78 acres of fix film area.
A VERY LOW FOOT PRINT
Using smaller biological reactors saves valuable space.
This translates into lower construction and infrastructure cost.
So far, for example, the PDM has required an investment of $3.6 M for
a treatment capacity of 1.4 MGD. The $2.57 /gl of treated
water infrastructure cost is one of the lowest on the market today.
The rectangular basins are supported on piles and have been
planned in a modular set up. Every time an expansion is required
only three (3) walls are built. This applies for both the
biological reactors and the secondary clarifiers.
The ten (10) year old plant has so far received one 0.80 mgd expansion.
WATER RECYLING
Water is becoming a high price commodity. To discharge the
same water after all the expenditures to comply with the
receiving natural system and not reuse it is simply
a waste of energy, manpower and lack of understanding
of sustainable systems. At the Palmas del Mar Plant,
the water is reused and discharged into a polishing
tank which recharges a pond that irrigates the
18 hole golf course and irrigates other landscap
projects that have been developed in this tourist
and residential community resort of 6,000 people.
This water maintains the complex eco-ponds at
their designed levels and provides protection from
salt water intrusion from the nearby Caribbean Sea.
Water is then returned via the hydrological cycle
through infiltration and evapotranspiration.
The natural system accomplishes a more advanced
treatment than a mechanical secondary system found
at conventional wastewater treatment plants.
Environmental Wastewater Treatment Systems
believes that this integration of natural an
mechanical processes will become the trend
during the next century.
MANAGEMENT
MANAGING PARTNER - PETER H. GRELL
Mr. Grell was born in Hamburg, Germany in 1931. After studying Mechanical Engineering in post-war Germany and later Business Management at New York University, he has pursued a dedicated and illustrious career in the hotel industry serving in various engineering capacities at such hotels as the Stanhope in New York, the Baton Rouge Hilton, and most recently the Condado Trio in San Juan. For 10 years he was Vice President of Palmas del Mar, in charge of Engineering, Condominium Management, Communications and Energy. Mr. Grell is a Member of the Caribbean Hotel Association. Since 1992, he has represented the Stahlermatic technology in the Caribbean.
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Mini Systems available include single family (1,000 gallons per day) up to
multi family systems enough for up to 53 people. They are ideally used where
soil types or reduced area precludes drain field applications such as coral and
rocky surfaces or where very high water tables make drain fields impracticable.
Commercial systems can be container mounted for use inside buildings or
exterior instant set-up and come in sizes up to 300,000 gallons per day per
unit. The effluent from these systems easily surpass secondary water treatment
standards and can be directed to polishing ponds for irrigation use thus
eliminating the need for expensive and relatively inefficient drainfields.
Optional filtration for effluent water provide complete elimination of
sediment, chlorination or fluoridation and final filtration including UV
treatment at up to rates exceeding continuous15 gallons per minute output
Stahlermatic Systems are also ideal for treatment of Agricultural and
Aquaculture waste streams or can be economically used to aerate pond water and
reduce trapped nitrates that adversely affect growing fish populations.
Low power consumption (as little as 80 watts) permit solar power generation
and mini-wind turbine applications
"CLICK"
below to download more details
The NEW Stahlermatic Mini System Brochure
The Stahlermatic System Description Brochure
For specific quotes or detailed consultation for your needs contact:
PRRecycling@bellsouth.net
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