Extended
Aeration
Modular Design
Capacities up to 500,000 GPD
DOWNLOAD HEI BIOLOGICAL PACKAGE TREATMENT
PLANT SPECS (pdf)
The
HEI “BIO-PAC” modular package treatment plant
utilizes the proven process commonly known as “Extended
Aeration” to cost effectively treat incoming organic
waste streams. The BIO-PAC system is conservatively designed
to treat a wide variety of domestic, municipal, and industrial
wastewaters. HEI’s modular design allows for ease of
installation and transportability. The BIO-PAC system is
designed to be a complete weather resistant, package plant
that satisfies strict state discharge requirements. An optional
HEI Sand Filter may be easily incorporated to meet strict
effluent requirements.
Bio-Treatment
Systems (Design Worksheet)
Hoffland
Environmental manufactures custom designed biological treatment
systems to remove organic contamination from wastewater.
In the case of sanitary waste, HEI manufactures a complete
line of package treatment plants varying from 1000 gallons
per day to 500,000 gallons per day. Units up to 50,000
gallons per day are shipped as factory assembled modular
units. Units over 100,000 gallons per day are usually assembled
on site. Tertiary filters are included when the discharge
limitations are very stringent.
For industrial wastewater containing high levels of soluble
organic products, it is usually more economical for the
generator to pre-treat the wastewater, reducing the COD
level to less than 500 and significantly reducing the city
imposed surcharge. HEI customizes its system for each particular
customer.
In one case to compensate for large surges of wastewater
containing a significant level of organic contamination,
the system included biotreatment in the equalization tank
before secondary treatment. By treating the waste as it
accumulated, adequate time was gained for the microbial
culture to populate and consume the organic constituents.
Secondary treatment then removed the suspended solids,
filtered the water and adsorbed all remaining organic components
as the water passed through a carbon adsorption vessel.
All hydrocarbons were economically removed and load on
the carbon was so low that carbon has not been replaced
in over two years of service.
It is usually far more economical to remove organic contamination
by active biological oxidation rather than carbon adsorption.
In addition, most hydrocarbons that are highly water soluble
are not readily adsorbed by carbon. These same compounds
that are not adsorbed by carbon are easily decomposed by
biological oxidation.
At a groundwater remediation facility, the collected water
was initially processed through an oil water separator
and a dissolved air flotation unit to remove all solids
and insoluble organic material. Then the bio-oxidation
unit removed the remaining soluble organic compounds. The
excess biofloc was removed by a secondary clarifier, before
filtration by a sand filter and further filtration by carbon
adsorption. The prudent use of the bio-oxidation unit dramatically
extended the life of the carbon adsorption media.
Hoffland Environmental custom designs its systems to include
oil water separation and suspended solids removal before
bio-oxidation if the added equipment is economically justified.
HEI manufactures the entire system including not only the
bio-oxidation unit but also oil water separator, clarifiers
and solids separation and solids compaction equipment.
For examples of several turn-key projects please "click" on
the Significant Customers List.
