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Submerged Membrane Module For MBR TORAY "MEMBRAY"

Toray Industries, Inc.

Water Treatment Division 8-1, Mihama 1-chome, Urayasu, Chiba 279-8555 Japan Tel: +81-47-350-6223 Fax: +81-47-350-6225 URL: http//: www.toray.co.jp

Published: August 2005

Preliminary Ver

I.

Introduction

"MEMBRAY" is the submerged membrane module suitable for the membrane bioreactor (MBR)

that has been developed based on the polymer science and the membrane fabrication technologies accumulated for along time in Toray Industries, Inc. 1. Features of MBR The process flows in the traditional activated sludge method (ASM) and in MBR are shown in Fig.I-1 and Fig.I-2, respectively. Unlike the traditional ASM, which employs a sedimentation process using a sedimentation tank, MBR separates sludge using membranes. The latter method has the following advantages: (1) Compact processing system Capable of handling activated sludge at a high concentration of MLSS, 7,000 to 18,000 mg/L, MBR can carry out biological treatment more efficiently, thus attaining better processing performance and a reduced size of the activated sludge tank. Because MBR does not need a sedimentation tank, it also enables space savings. (2) High quality of treated water The adoption of membranes eliminates the possibility of suspended solid (SS) leakage that could occur in the sedimentation process. MBR can also virtually reject microorganisms such as Escherichia coli and Cryptosporidium.

Waste water Activated sludge tank Sedimentation tank

Discharge

Fig. I-1

Waste water Membrane Submerged Tank

ASM Flow

Submerged membrane module "MEMBRAY"

Discharge or reuse

RO membrane

Reuse

Fig. I-2

MBR Flow

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2.

Outline of "MEMBRAY" "MEMBRAY" is a module composed of an element block and an aeration block. The element block

contains a number of membrane elements stacked at equal intervals, each of which has flat sheet membranes attached on both sides of a supporting panel. Each element is connected via a tube to a permeated water manifold. The aeration block consists of air diffusers used to supply air (see Fig.I-3). This module is used in an activated sludge tank. The following shows the features of "MEMBRAY".

Tube

Permeated water manifold

Element block

Element

Aeration block

Module

Air diffuser

Fig. I-3

Appearance of "MEMBRAY"

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(1) Shape of Element The element is of a simple flat sheet membrane construction as shown in Fig.I-4. The membrane surface is cleaned effectively by an upward stream of water generated as air is diffused below it (Fig.I-5). This mechanism ensures stable filtration because the membrane does not easily admit of sludge adherence to its surface. In addition, thanks to the long element design (1.6 m), a larger membrane area is achieved per footprint, allowing effective use of diffused air.

Supporting panel 0.5 m Permeated water nozzle

Membrane

1.6 m

Fig. I-4 Structure of Element

Element Permeated water

Air Air

Membrane Supporting panel

Membrane Activated sludge particle

Fig. I-5

Filtration Principle of Activated Sludge

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(2) Membrane materials The use of PVDF (Polyvinylidene Fluoride) for the membrane and PET (polyester) non-woven fiber for the base makes this membrane superior in physical strength and chemical stability. (3) Membrane structure Numerous small-diameter pores are distributed evenly over the membrane surface with a sharp diameter distribution. This structure gives an outstanding high treated water quality and an excellent water permeability, making the membrane highly resistant to clogging (see Fig.I-6 and Fig.I-7) compared to other membranes.

3.0 micron

3.0 micron

Toray PVDF Membrane Fig. I-6 1.5

Other Membrane

Membrane Surface (photo)

Number of pore (1012/m2)

Toray PVDF Membrane 1.0 Other Membrane

PVDF

BF014

0.5

0 0 0.2 0.4 0.6 0.8

Pore diameter (micron)

Fig. I-7 Pore Diameter Distribution

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II. SPECIFICATIONS AND PERFORMANCE OF "MEMBRAY"

1. Specifications of Element TableII-1 and Fig. II-1 shows the specifications and the appearance of the element, respectively. TableII-1

Model name Membrane configuration Application Filtration method Nominal pore diameter (µm) Effective membrane area (m2) Dimensions (mm) Total width Total height Thickness Weight (kg) Main material Dry Wet (Reference) Membrane Supporting panel

Specifications of Element (TSP-50150)

TSP-50150 Flat sheet Filtration of activated sludge Suction filtration 0.08 1.4 515 1,608 13.5 4.8 8.0 PVDF and PET non-woven fiber ABS resin

515 mm

Permeated water nozzle

50 mm

1608 mm

Fig. II-1

Appearance of Element

2.

Specifications of Tube Table II-2 shows the specifications of Tube. Table II-2 Specifications of Tube

TPU-ARET*1 8/12/360

Material Inside diameter / outside diameter / total length (mm) *Allowable temperature limit: 60°C *1 The material name due to the ISO-18064.

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3.

Specifications and Performance of Module Table II-3 shows the specifications of Module. Table II-3 Specifications of Module

TMR140-100S 100 1 deck 1 row 810 1,620 2,100 695 65 630 1,240 TMR140-200W 200 1 deck 2 rows 840 3,260 2,100 1,430 150 1,280 2,480 TMR140-200D 200 2 decks 1 row 810 1,620 4,160 1,365 65 1,300 2,500

Model name Number of membrane elements Element block structure Dimensions*1 Width (mm) Length (mm) Height (mm) Weight kg Module (dry) Aeration block (dry) Element block (dry) Element block (sludge clogging)*2 Diffuser, Flame, water manifold Manifold Air diffuser Temperature (°C) pH of liquid MLSS (mg/L) Trans-membrane pressure (kPa ) Cleaning chemicals feed pressure (kPa ) Cleaning chemicals and chemicals concentration Scouring Air Flow rate (NL/min/Module) *1 *2 *3 *4 *

*4

TMR140-050S 50 1 deck 1 row 810 950 2,100 400 40 360 690 Permeated JIS 40A JIS 32A

Material Connection flange*3 Operating Range

304 stainless steel JIS 50A JIS 40A 5-40 5-10 Not higher than 18,000 Not higher than 20 Not higher than 10 Sodium hypochlorite (effective chlorine concentration) 2,000-6,000 mg/L(pH is around 12) Oxalic acid Citric acid 650 - 1,000 0.5-1.0wt 1.0-3.0wt 1,300 - 2,000 2,600 - 4,000 1,800 - 2,000 JIS 80A JIS 50A JIS 50A JIS 40A

Indicates the maximum size (excluding the connection tube). The maximum weight is assumed for a case of sludge clogging between elements. For flange dimensions, see the drawings at the end of this manual. Excludes chemical cleaning of the elements using a designated chemical. Comply with the above operating range.

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Preliminary Ver

Table II-4 shows the performance of Module. Table II-4

Model name Permeated water quality*1 Filtration capacity*4 *1 *2 *3 *4 TSS (mg/L)

*2

Module Performance

TMR140-100S TMR140-200W TMR140-200D

TMR140-050S

Not more than 1.0 Not more than 1.0 42 84 168 143

Turbidity (NTU) *3 Reference Quantity of water treated (m3/d)

This value can be attained when operated under the standard operating conditions as specified in this Instruction Manual during a period specified separately by Toray. Measuring method of TSS is complied with Standard Method of Examination of Water and Wastewater 20th Edition (1998), Section 2540D, Total Suspended Solids Dried at 103-105°C or ISO 11923. Measuring method of NTU is complied with Standard Method of Examination of Water and Wastewater 20th Edition (1998), Section 2130, Turbidity or ISO 7027. Reference value, not a guaranteed value, for treatment of ordinary sewage.

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