Kelair-Blivet™ NR
Biological Nutrient Removal Plant
‘When Pump Knowledge Matters’
Call 1300 789 466
PROCESS OUTLINE
The treatment plant layout is based on the well established
Modified Ludzck Ettinger (MLE) process. The process
includes the addition of an anoxic zone, followed by an
aerobic zone. Additional rotor length is provided within the
treatment plant to provide for the conversion of ammonia to
nitrate (nitrification) and an internal recycle within the
treatment plant back to the anoxic zone to provide for the
conversion of nitrate to nitrogen gas (de-nitrification). The
removal of BOD is catered for within the aeration zone.
PROCESS DESCRIPTION
The treatment plant layout has 6 sections all of which
are accommodated within one to two Fibre Reinforced
Plastic (FRP) tanks depending on the effluent loadings.
The treatment plants are divided into the following
zones:
 PRIMARY SETTLEMENT
 DENITRIFICATION ZONE: Anoxic Zone
 AERATION ZONE: BOD Removal & Nitrification Zones
 SPLITTER BOX
 FINAL SETTLEMENT
 SLUDGE STORAGE
The harmful effects of eutrophication due to excessive
nitrogen and phosphorus concentrations in the aquatic
environment in many parts of the world have been well
documented. Discharges from wastewater treatment
plants have, in many cases, been significant
contributors to this problem. In addition to stimulating
eutrophication, nitrogen in the form of ammonia can
exert a direct demand on dissolved oxygen (DO) in a
waterway and can be toxic to aquatic life. A negative
impact on waterways may still remain even when a
treatment plant converts ammonia to nitrate by a
biological nitrification process, as the resultant nitrate
can stimulate algae and phytoplankton growth.
Phosphorus also contributes to the growth of algae.
Due to these documented problems, many regulatory
authorities around the world have responded with
more stringent discharge standards for sewage and
effluent treatment plants.
The Kelair-Blivet™ NR includes the option of biological
nitrification and denitrification while still maintaining
the advantages of the “All-in-one Packaged SewageTreatment Plant Design.” Phosphorus removal can
also be partly catered for by biological removal and
with the addition of chemical dosing for more stringent
discharge requirements .
Kelair-Blivet™ NR
Biological Nutrient Removal Plant
Call 1300 789 466
‘When Pump Knowledge Matters’
Sizing:
The sizing of the Kelair-Blivet™ NR is dependent on loadings:

Hydraulic

BOD

Suspended Solids

Ammonia
Please contact Kelair for appropriate sizing of all Kelair-Blivet™ NR.
Primary Settlement:
Each Kelair-Blivet NR unit is capable of receiving raw sewage and settling the gross solids without recourse to mechanical means. It incorporates lamella or parallel plates to enhance efficiency and utilisation of space. The Primary Settlement zone reduces the Suspended Solids
by 75% and the BOD by 25% to 30%. This zone is relatively maintenance-free and contains no moving mechanical or electrical devices.
Lockable FRP covers with easy man access and sufficient ventilation are provided.
Denitrification Zone:
Effluent from the Primary Settlement zone is mixed with recycled flow from the end of the Aeration zone. These
two streams are mixed in a ratio of 1: 2 (or higher in some cases) and then enter the Denitrification zone. The
Denitrificaiton zone is composed of plastic media which provides a surface on which the denitrifying bacteria
adhere. The denitrifying bacteria convert the Nitrate (NO3) from the recycled flow to Nitrogen (N2) Gas. The BOD
in the incoming effluent provides the carbon that is required for the bacteria to grow. This also has the advantage of reducing the BOD load to the aeration zone by approximately 20%.
Aerobic Zone:
The combined flows from the Denitrification zone is treated by means of an efficient and compact system (the Aerotor Biozone) requiring
minimal power input and maintenance. It is a combined fixed film reactor and active aeration system mounted on a horizontal shaft. The
rotational media is a spiral formation enclosed in an outer drum to provide active aeration, intense surface area and net hydraulic lift. The
Biozone is self-cleansing and no extraneous pumping or sludge returns are required. For process efficiency it is, in effect, a plug flow system.
The BOD is removed to low levels in the first rotor/s as carbonaceous bacteria are more robust than nitrification bacteria. Once the BOD has
been reduced to low levels, the nitrification bacteria begin to grow on the remaining rotor/s.
Splitter Box
An important aspect of treating the effluent down to low nutrient levels is the recycle of flow back to the Denitrification zone. The splitter box
can be adjusted to recycle different flow ratios depending on the outlet effluent requirements.
Final Settlement
The Final Settlement or Humus Tank is a discrete compartment denying ingress of untreated or partially treated liquor. The design is similar
to the Primary Settlement Tank on an upward flow basis. This zone has frequent automatic removal of sludge-to-sludge storage by means of
a timed submersible pump. It also has a pump designed to return sludge to the aeration zone to maintain the concentration of nitrification
bacteria within the Aeration zone.
Sludge Storage:
Sludge Storage is provided in the base of the units. Depending on the load applied there is approximately 12 weeks capacity provided.
Normally desludging is carried out by suction-tanker.
Kelair Pumps Australia Pty Ltd
A Mace Group Company
ABN 28 001 308 381
E-mail: [email protected]
www.kelairpumps.com.au
PUMPS
HEAD OFFICE & FACTORY
211-215 Walters Road Arndell Park NSW 2148
Toll-free within Australia 1300 789 466
Ph +612 9678 9466
Fax +612 9678 9455
BUILDING & FIRE
ENVIRONMENTAL
VIC
TAS
WA
QLD
Fax 03 9768 2907
Fax 03 6331 9102
Fax 08 9248 2255
Fax 07 3805 7309 Brisbane
Fax 07 4952 1097 Mackay
SERVICE
BNR-Mar14