DVZ Biomaster PLUS Series Final Documentation Download

Page: 58 / 145

Issue: 16.08.2010

Instruction Manual DVZ-SKA “BIOMASTER“-PLUS

Page 8 of 39

The pre-treated ”sewage” flows through a special overflow into the bioreactor tank

containing the submerged fixed bed, which is positioned at the centre of the reactor tank.
The microbes are sitting on the suface the submerged fixed bed, as so called “biological
rasen” (immobilized biological reactor). The sewage has continiously circulate through the
submerged fixed bed. For that reason, a ring-aeration-tube is installed around the
submerged fixed bed. This aeration tube produced an upstream around the fix bed, for
continuous lift up the sewage and send over the reactor bed.
Fine air bubbles blown in and keep the sewage in suspension and supply the micro-
organisms with necessary oxygen.
Remaining activated sludge is fed back into the pre-treatment tank

(11)

, by using a sludge

lifting pump (Mamut pump principle) for continoues force the process.
The biologically cleaned sewage is send via a inner guide system and a rising pipe to the
pre control tank

(16)

The pre treatment tank have a free floating level and act as control tank for control the
STP. The level sensor

05,

with three set points (

L, H

, and

) activate the following

BMSU loading pump

(P2)

and the over fill alarm.

The discharge pump (

08 or P6)

have a double funktion, deliver flush water for clean the

modul head and foot and empty the STP.
In some cases an optional three-way-valve (Holding tank valve) for direct the STP filling to
holding tank.

Stage 2: BMSU post treatment System:

Separation system (BMSU)

The concept of

SKA “BIOMASTER” PLUS

series is an arrangement of conventional SKA

sewage treatment plant, type approved acc. to

IMO Resolution MEPC 2.( VI)

with adding

a BMSU system for polishing up the clean water and producing higher quality permeate
according to

IMO Resolution MEPC. 159 (55).

Separating biomass from treated water will be done by

“cross flow”

method by using an

from

DVZ-Services GmbH

developed membrane module (DVZ-BMSU, module).

This BMSU have a compact 100% welded module construct without any seals or plastic
parts, with St. St. diaphragm tubes.
The “BMSU- over flow pump”

(P1)

generates a permanent high membrane over flow. In

these high speed over flow loop, the biological treated water/biomass mixture will be
delivered through the “BMSU- loading pump”

(P2)

As a result of feeding, an over pressure will be created on the feed side of membrane.
Thereby, permeate flux will be forced through the membrane and the bio-sludge -all solids
and bacteria- will be send back to the STP. The “BMSU- loading pump” (P2) will be limited
by pressure holding valve (PHV). A part of flow (reject) will be fed back to the bioreactor
via the pressure holding valve. The ratio of the amount of loading to feed backing (reject)
will define the sludge concentration in the modules.

The amount of produced water (permeate) is controlled by adjusting the pressure holding
valve

(PHV)

and will be indicated by the flow indicator

(FI 1)