RO/NFUFMBR

Chemicals

CAS E STUDY
RO | UF | MBR

Wastewater Treatment
British Columbia, Canada

Toray MBR Modules Help Achieve Sustainable Management of Wastewater onVancouver Island
BACKGROUND
In 2006, Toray began a successful relationship with the Cowichan
Valley Regional District (CVRD) in beautiful Vancouver Island,Canada. Two membrane bio-reactor (MBR) systems werecommissioned that year at CVRD at the Lambourn Estates and theSentinel Ridge Sanitary Sewer Systems. Both systems incorporated
Toray's TMR140 series MBR modules.
The Lambourn Estates system treats an average daily flow (ADF)of 140 m3/d with a peak daily flow (PDF) of 350 m3/d. The
effluent is further treated by ultraviolet (UV) then discharged tothe ocean. The ADF at Sentinel Ridge plant is 180 m3/d.
CVRD later installed several new MBR plants, including Twin Cedars(137 m3/d ADF) in 2007; Woodland Shores (200 m3/d) in 2008;
and Arbutus Ridge (350 m3/d) in 2016.
MBR systems are proven to produce a high-quality effluent witha compact footprint, low maintenance, and modular design thatmakes it easy to upgrade. Table 1 below shows the typical MBR
effluent quality when treating municipal sewage. An analysis
performed in June 2020 at the UV outlet of Sentinel Ridge shows
the MBR modules are still producing excellent treated water
quality (Table 2).

Figure 1: Installation of original Toray MBR

Table 1 — Typical MBR effluent quality
Parameter

Units

Effluent
quality

Notes

BOD

mg/L

<5

Typically, non-detectable

TSS

mg/L

<5

Typically, non-detectable

NH3-Nmg/L<1

Typically, <0.5 mg/L

TNmg/L<10Typically, <3 mg/L in warm climates

TPmg/L<0.5

Typically, <0.1

Turbidity

NTU≤1Typically, <0.2, 95% of the time

Table 2 — Effluent quality at Sentinel Ridge

Figures 2 & 3: Operation of NHP210-300S at Arbutus Ridge

03-CA-MB3-BritishColumbia-202205

1 of 2Parameter

Units

MBR effluent quality

Fecal coliform

CFU/100 mL<1

Nitrate-N

mg/L

0.22

Total N

mg/L

5.37

BOD

mg/L

<4TSS

mg/L

<2Turbidity

NTU

0.4

CASE STUDYToray MBR Modules Help Achieve Sustainable Management of Wastewater on
Vancouver Island

RO | NF | UF | MBRPERFORMANCE

Figure 4: Influent and Effluent TSS(note: all non-detect permeate samples were assumed to be 0.2 mg/L)

At Sentinel Ridge, the influent BOD is 350 mg/
L and operates at an MLSS between 9–15 g/L.
The only pretreatment includes two equalization
tanks that are hydraulically connected and a2 mm screen. The MBR system operates at anaverage flux rate of 11 gfd with a transmembranepressure (TMP) between 1.0 and 1.5 psi andcleaning intervals of once every six months.
The graph in Figure 4 illustrates the influent andeffluent total suspended solids (TSS). Effluent TSS
was 1 mg/L on average.
HIGH PACKING DENSITY MBR
In 2016, Toray introduced the 'New High
Performance' (NHP) MBR module (Figure 5).
The NHP uses the same durable polyvinylidene
fluoride (PVDF) flat-sheet membrane of theTMR modules. However, one TMR140-100S
module consists of 1,507 ft2 in membranearea, while an NHP210-300S holds 2,260 ft2 inmembrane area, giving the NHP module a 50%
higher packing density. The additional surface
area allows the end-user to treat higher flows
or operate at a reduced flux rate. Furthermore,
the unique construction of the NHP module
has reduced the weight by 70% for easiershipping and handling. TMR modules are easily
retrofittable with the NHP.
CVRD installed several of its MBR plants with thislatest technology. The MBR system at Arbutus
Ridge was able to expand its capacity from 350
m3/d using two rotating biological contractors
to 650 m3/d using six NHP210-300S modules.
The Twin Cedars plant installed four NHP210300S modules by retrofitting the TMR140-100S
model and utilizing spare spaces available in theMBR tank. The capacity tripled from 137 m3/d to450 m3/d. Lambourn Estates also installed four
NHP210-300S modules.

Figure 5: Toray flat-plate and flat-sheet MBR Modules

TORAY INDUSTRIES, INC.
Head Office: Nihonbashi Mitsui Tower 24th Floor, 1-1, Nihonbashi-Muromachi 2 chome, Chuo-ku,Tokyo, 103-8666, JAPANwww.water.toray+81 3 3245-4540

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All information presented herein is believed reliable and in accordance with accepted engineering practices. Toray makes nowarranties as to the completeness of this information. Users are responsible for evaluating individual product suitability forspecific applications. Toray assumes no liability whatsoever for any special, indirect or consequential damages arising from thesale, resale or misuse of its products. © 2022 Toray Industries, Inc. Subject to change without notice.
03-CA-MB3-BritishColumbia-202205

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