The MBR Book: Principles and Applications of Membrane

Table 3.8 Feedwater quality, PLWTP
Parameter (mg/L) Raw sewage Advanced primary
treated sewage
Ammonia-N 27.3 26.6
BOD 5 213 97
COD 463 216
TOC 40 44
TKN 42.9 44.8
Ortho-phosphate-P 0.61 0.46
Table 3.9 Design information, PLWTP
Design 139
Kubota USFilter Zenon Mitsubishi Rayon
Screening 3.2 mm travelling 1.0 mm wedge 0.75 mm 0.75 mm
band screen wire slotted perforated perforated rotary
Tank sizes (m
rotary screen rotary drum
screen
drum screen
3 )
Denitrification 6.42 3.79* – –
Nitrification 12.5 5.7 4.92 6.06
Membrane – 0.34 0.7 0.95
Recycle ratio
Membrane
4 (303 l/min) – – –
Type 510 B10 R ZW500d Sterapore SUR
Configuration 100 panels/deck, 4 modules 3 modules 50 modules/
double deck bank, two banks
Total membrane
area (m
160 37 69 100
2 )
*Not used in trial.
oxygen from fine bubble aeration than the other technologies (Table 3.10). This being
said, the data for specific aeration demand appear to demonstrate that, for this trial:
(a) The Mitsubishi Rayon system had a significantly higher specific aeration
demand with respect to membrane aeration (SAD m and SAD p), reflecting the
somewhat lower permeability of the membrane material.
(b) There was little difference in the figures for the total specific aeration demand
(TSAD p) of all those technologies operating without denitrification under the
most optimum conditions, the figures ranging from 51 to 62.
The latter point is interesting in that it suggests one of two things: (a) that the air
from fine bubble aeration somehow ameliorated membrane fouling, or (b) that the
coarse bubble aeration contributed substantially to the DO.
The permeability data also provides interesting information on system operation
and maintenance. The Zenon system was the only one operated with regular (three
times a week) maintenance cleans by backpulsing with chlorine (250 ppm) or citric