M.Sc
Islamic Azad University
Science and Research Campus
Thesis for Master Degree in Environmental
Water and Weast Water Engineering
Title: The technical and economic comparison of in the industrial treatment plant
in the Tehran industrial estate
Supervisors Professor :
Dr Borghei Mahdi
Dr Hasani Amir hesam
Advisors Professor :
Dr Mir Bagheri Seyed Ahmad
Dr Javid Amir Hossein
By: Reza Mirzaee
Feb 2010
......
........
............................................................................................................
(EA-AS)
(AB)
MBBR
(SBR)
(ICEAS)
(IFAS)
USBF
(UASB)
(UAFB)
(UABR)
(Contact Process)
SAGB
(
ICEAS
USBF
UASB
BOD5
COD
TSS
BODCODTSS
BOD5
COD
TSS
BOD5CODTSS
BOD5
COD
TSS
BOD5CODTSS
COD
TSS
BOD5
COD
TSS
BOD5CODTSS
BOD5
COD
.
TSS
..
BODCODTSS
BOD5
COD
TSS
BOD5CODTSS
BOD5
COD
BOD5COD
BOD5
COD
TSS
BOD5CODTSS
COD
TSS
COD
TSS
CODTSS
COD
TSS
BOD5
COD
TSS
BOD5
COD
TSS
BOD5
COD
TSS
BOD5
COD
TSS
BOD5CODTSS
COD
TSS
BOD5
COD
TSS
COD
TSS
BOD5
COD
TSS
BOD5CODTSS
BOD5
COD
TSS
pH
BOD5
COD
TSS
pH
BOD5
COD
TSS
pH
COD
TSS
pH
BOD5
COD
TSS
pH
BOD5
COD
TSS
pH
BOD5
COD
TSS
pH
BOD5
COD
pH
BOD5
COD
TSS
pH
COD
TSS
pH
COD
TSS
pH
BOD5
COD
TSS
pH
BOD5
COD
TSS
pH
BOD5
COD
TSS
pH
BOD5
COD
TSS
pH
COD
TSS
pH
BOD5
COD
TSS
pH
COD
TSS
pH
BOD5
COD
TSS
pH
UAFBPH
PHUAFB
UAFB
AB
PHUAFB
PH
PH,COD,BOD,TSS
QCOD,BOD,TSS,
UAFB
PH PH
PH
PHPHPH
PH
PH
PH PH
PH
ON-LINE PHSupernatant PH
PH
PH
PH AB
The technical and economic comparison of in the industrial treatment plant
in the Tehran industrial estate
By : Reza Mirzaee Supervisors :
Dr Borghei Mahdi
Dr Hasani Amir hesam Advisers :
Dr Mir Bagheri Seyed Ahmad
Dr Javid Amir Hossein
Abstraction
Based statistical analysis and site viewing it could be declared in this research that all the waste water treatment processes which applied in waste water treatment plants of industrial cities are combined and biological treatment approaches. At the present time all plants are in service with a reasonable efficiency. So consequently we can say that anaerobic reactors have good efficiency and reliability in encountering Hydraulic shocks and organic loads and also economic, but they are weak and inefficient in acidic effluents so it is recommended:
The acidic effluents shall be neutralized prior to discharge to anaerobic reactors or anaerobic reactors mustn t used for acidic effluents. Also it can be neutralized or be raised to
pH or beyond in equalization tank. The Low pH on line alarm system must be installed in entrance of plant. A recycle stream must be applied
Supernatant - from aerobic more than
pH - to entrance of system . The volume of this recycle line has to be calculated in designing process to avoid lack of retention times.
Lime or alkaline dosing shall be installed prior to equalization tank for neutralization.
The acceptable waste water draining limitations for plants in industrial cities is
.
it shall be upgraded to 7 or upper.
In case of low organic loads it is recommended to use extended aeration or AB reactors
The main criteria for discharging the output of water treatment plants to surface waters or for irrigation are the standards of Environment Organization of Iran. These qualitative and quantitative criteria are pH, COD, BOD, and TSS. The basic fact witch designers use to design the industrial cities waste water treatment plants is the organic load. It means the designs and calculations are in the base of Flow, TSS, BOD, COD and the volumes of reactors are neither huge (noneconomic) and nor small (not capable). Though using high efficiency anaerobic reactors - up stream
powered by media ( UAFB ) in the first stage of plants is very common. This kind of design is very powerful against organic and hydraulic shucks. The second stage is usually an aerobic or activated sludge system. The combination of these two stages has a very high recovery
%. The main disadvantage of this system is the poor resistivity against low pH waste water, because the volume of anaerobic reactors has not any significant roll against acidic streams. The organic reactions in anaerobic reactor decrease the pH approximately one degree. This occurs due to acid production reactions. So when a low pH
less than
effluent enters to anaerobic reactor reduces the pH to less than
and stops the methane producer bacteria s activity and consequently the reactor will work malfunction. For example in Aq Qala waste water treatment plant anaerobic reactor eliminated and only the aerobic reactor employed , this system has a powerful resistance to acidic shocks because the reactor has always
or higher pH and an efficient equivalence with air to remain neutral. So consequently we can say that anaerobic reactors have good efficiency and reliability in encountering Hydraulic shocks and organic loads and also economic, but they are weak and inefficient in acidic effluents so it is recommended:
The effluent s pH shall be noticed carefully, if it has an acidic situation it must be neutralized or another approach must be chosen, prior to discharge to anaerobic reactors. With reference to stated facts the effluent must has a
pH or beyond in equalization tank prior to discharge to anaerobic tank.
The following steps are proposed for neutralization: The Low pH on line alarm system must be installed in entrance of plant.
A recycle stream must be applied
Supernatant - from aerobic more than
pH - to entrance of system. The volume of this recycle line has to be calculated in designing process to avoid lack of retention times.
Lime or alkaline dosing shall be installed prior to equalization tank for
neutralization.
The acceptable waste water draining limitations for plants in industrial cities is
it shall be upgraded to 7 or upper.
In case of low organic loads it is recommended to use extended aeration or AB reactors
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