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CONSTRUCTION WORLD
NOVEMBER
2015
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PRODUCTS AND SERVICES
Water harvesting
The need for municipalities to upgrade water supply infrastructure and
to supply hygienic water to all communities has never been more para-
mount. Additionally, commercial and residential entities are looking to
use grey water wherever possible to cut back on potable water usage
and the associated costs.
Rocla offers the ecoRain rainwater harvesting tanks, which are
used for water catchment and recycling or attenuation, offering long
lasting water storage systems. These underground concrete tanks
ensure a constant temperature with no sunlight entering the system
which constitutes considerably more hygienic conditions compared to
above ground plastic alternatives where micro-organism growth occurs
due to fluctuating and warm temperatures and light. Additionally, the
concrete also has the added benefit of neutralizing the normally slightly
acidic rainwater.
The concrete tanks are designed complete with manhole access
chambers, a sediment filtration system, velocity reducing inlet and
outlet overflow control. Top-up systems, pumps and electrical control
system (if required) can be supplied by the installer.
The system is recommended for roof water only and connects to
downpipes capturing the water for filtration and storage. This captured
water supply can be re-used for toilet flushing, laundry, gardening
activities and washing of equipment, dustbins, vehicle, etc. EcoRain
systems are easy to install and maintain with limited annual mainte-
nance requirements.
Manna Hoogenboezem from Use-Rainwater, who partners with
Rocla on the ecoRain system design and installation, said “The Rocla
ecoRain concrete water storage tanks have generated a great deal of
interest not only from the private sector but also at municipal level. The
increase in interest from privately established developments as well
as architects for future projects shows a keen desire to select the most
suitable and long lasting water harvesting solution. Although more
expensive, the Rocla technology is the most effective and has been
successfully utilised in Australia”.
Justin Kretzmar, sales engineer for ISG, added that “a Rocla
ecoRain system comprising 50KL storage has already been detailed
and specified by the relevant architects and engineers on a municipal
building currently under construction in the Western Cape. The tanks
are expected to be installed January/February 2016.”
Oil separators of strict standards
The catastrophe associated with oil and petrochemical contamination
from small quantities up to large spills on the natural environment and
the associated high clean-up costs can be prevented with the
ecoLine-b, ecoSep and ecoStop separator technology which is
available from Rocla.
These underground oil and petrochemical separators, far exceed
both SA and European standards which require separation to 10 ppm.
The ecoSep, ecoStop and ecoLine-b range of separators are rated at
5 ppm and perfectly positioned to comply with future, more stringent
standards, allowing for tighter environmental discharge compliance
guidelines to be met with little or no modifications required.
The oil/water separators are designed to separate non-emulsified
light liquids or low-water-soluble fluids with a specific gravity below
0,95 (gasoline, diesel, heating oils and other mineral oils) from effluent
discharge. The two-step separation process; gravity separation and
removal of small oil/petrochemical particles by coalescing media
elements, produces high removal efficiencies.
Separators without an oil draw-off, such as the ecoLine-b unit,
accumulate the separated light fluids on top of and in direct contact
with the water surface.
EcoSep permanently separates the oil from water by transferring
this oil into its own self-contained tank, thereby allowing virtually no
oil emulsion formations to develop. A standard version of ecoSep is
equipped with a manual oil draw-off, a valve that can be opened and
closed from ground level to collect oil in the independent oil recipient.
An Automatic Draw Off device (ADD) is also available.
The ecoStop Spill Control System is designed to control failures at
any site where there is risk of a large potential spill due to mechanical
failure of the holding tank, pipes or hoses. A spill situation results in
closure of the ecoStop valve, preventing the discharge of free oil to
municipal sewers or direct discharge outfalls. Ecostop maintains the
Specialised
SUSTAINABLE
technologies
In order to service the growing trend for
owners/developers of new building and
construction projects to specify the use of
environmentally friendly and carbon foot-
print reducing products and technologies
as a priority requirement, Technicrete
ISG, Ocon Brick and Rocla, part of the
Infrastructure Specialist Group (ISG) of
companies, offer paving, bricks, oil separators
and water attenuation and harvesting
technologies that offer environmentally
friendly and cost saving options for
commercial and residential developments.
These underground oil and petrochemical
separators, far exceed both SA and European
standards which require separation to 10 ppm.
Recycled non potable water required for activities such as sanitation
and landscaping can easily be captured via the Aqua permeable
paving technology from Technicrete.