efficiency assessment of effluent treatment plant in a paper ant industry, unit: tribeni
TRANSCRIPT
PROJECT ON :
Efficiency Assessment of Aeration Tank.A Case study in a paper and pulp industry, Unit: Tribeni.
Report for partial fulfillment of M.Sc in Environmental Science of University of Kalyani.
Presented by:Priyabrata Roy.
M.Sc, 4th SemesterDepartment of Environmental
ScienceUniversity of Kalyani.
Email: [email protected]
IntroductionIndustry is one of the major source of Waste Water in this civilized era. It is continuously polluting our environment. Minimization of pollution load of discharging waste & waste water is the primary goal. Most effective treatment for this purpose is Effluent Treatment Plant installation in the industry. I have carried out my project at a Paper and pulp industry, Unit: Tribeni. I have chosen this because: Paper industry is under RED category Industry.Discharging huge amount of waste water. Aeration process & activated Sludge Treatment are being followed by the industry.
Aims & Objectives. My aim is to study The Efficiency of Aeration Tank operation & The Overview of Environmental management System at the Paper mill, Tribeni.To achieve the aim following objectives are taken:
Understanding the Papermaking process. Effluent Treatment Plant Operation. Assessment the efficiency of Aeration Tank & its further modification.
EMS
An Overview of the ITC Ltd.(PSPD)
Study Area &Unit Profile Industry Unit: Tribeni is set up near the bank of Hooghly river, under Chandrahati G.P.2•A Specialty Paper Mill•Three Paper Machines ( PM:1,3&4)•Production 2012-13: 30387 MT•Annual Turnover = $ 240 Million•Certified ISO 9001, ISO14001 and OHSAS 18001
Specialty Papermaking Process.( Flow Chart)
Imported pulp & Broke paper.
Refiner
Head box
Forming & Press Section
Drier & Calender.
Refilling & Rewinder
Ro
bb
in Slitti
ng
Packing Despatch
Following Wastewater Treatment has been adopted by the paper mill.
Classification of Methods
Physical Processes
Chemical Processes
Biological Processes
ScreeningEqualization TankSedimentation
Alum DosingChlorination
Aerobic Waste Water Treatment( Aeration Tank).
ETP Operation Flow Chart.
Waste water Bar Screen Equalization Tank
Primary Clarifier Clarifloculator
Aeration Tank
Final Clarifier (1&2)
Discharge. Secondary Sludge
Primary Sludge
Retu
rn Slu
dge
A GENERAL STRUCTURE OF CLARIFIER
ETP Plant Picture.
Sampling Site.
Target Set by Paper Mill to maintain effluent discharge….Name of the Parameter.
WBPCB Benchmark.
Concentration in Waste Water.
pH 6.5-8.5 6.5-8.5
DO (mg/l) 3.5-4.5 3.0-3.5
MLSS (mg/l) 2000-4000 1500-3500
MLVSS Unknown 60
SVI <50 <75-100
BOD(mg/l) 30 25
COD(mg/l) 350 200
Waste water discharge (cu.M/T)
200 100 (by2007).
Results & Discussion.
Study of Aeration Tank pH.9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
19/3 20/3 21/3 22/3 24/3 25/3 26/4 27/3 28/3 29/3 30/3 31/3
7
7.2
7.4
7.6
7.8
8
8.2
WBPCB Standard.
pH of Inlet
pH of Outlet
TIME →
pH
Study of Aeration Tank D.O(mg/Lt).
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
19/3 20/3 21/3 22/3 24/3 25/3 26/3 27/3 28/3 29/3 30/3 31/3
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Mill Standard.
DO(mg/Lt) of Inlet
DO(mg/Lt) of Outlet
TIME
Con
c. in
mg/
Lt
MLSS STUDY OF AERATION TANK
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
19/3 20/3 21/3 22/3 24/3 25/3 26/3 27/3 28/3 29/3
0
1000
2000
3000
4000
5000
6000
INLET MLSS/SS(mg/Lt)
0UTLET MLSS/SS(mg/Lt)
MILL STANDARD 3000
MLSS IN mg/Lt OF AERATION TANK INLET vs OUTLET.
TIME
Conc, in mg/Lt
SVI Study of Aeration Tank.9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
19/3 20/3 21/3 22/3 24/3 25/3 26/3 27/3 28/3 29/3 30-Mar 31-Mar
0
50
100
150
200
250
300
350
400
SVI OutletSVI InletMILL STANDARD
SVI of Aeration Tank (Inlet vs Outlet).
SVI
Time
MLVSS study of Aeration Tank.9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
19/3 20/3 21/3 22/3 24/3 25/3 26/4 27/3 28/3 29/3 30/3 31/3
0
10
20
30
40
50
60
70
80
MLVSS(%)of InletMLVSS(%)of OutletWBPCB Standard
MLVSS (%) INLET vs OUTLET.
Time
% o
f M
LVS
S
Graph of BOD in Final effluent with respect to WBPCB & Mill Standard.
19/3
21/3
23/3
25/3
27/3
29/3
31/3
0
5
10
15
20
25
30
35
BOD OutletWBPCB StandardMILL Standard
BOD(mg/Lt) of final effluent
Con
c.
Time.
Graph of COD in Final effluent with respect to WBPCB & Mill Standard.
19/3
21/3
23/3
25/3
27/3
29/3
31/3
0
50
100
150
200
250
300
350
400
COD Outlet
WBPCB Standard
MILL Standard
COD(mg/Lt) of final effluent
Con
c.
Time
Determine the Efficiency of Aeration Tank in Respect to DO(mg/Lt).
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
9:3
0A
M
2:0
0P
M
19/3 20/3 21/3 22/3 24/3 25/3 26/3 27/3 28/3 29/3 30/3
0
10
20
30
40
50
60
70
80
90
100
Efficiency in respect to DO in Aeration Tank.
Efficiency in respect to DO in Aeration Tank.
% o
f E
ffic
ienc
y
Time
Environmental Management System at Paper Industry, Unit: Tribeni
ITC strictly follows their own EHS Policy. This unit certified by ISO 9001, ISO14001 and
OHSAS 18001
Conclusion.
Different tests were performed in various sites with particular time inter time interval. After the experiment, I have got the result that,: pH is regularly maintained by Alum dosing. SVI in some case is higher than Mill Standard. Aeration process is 80%-85% efficient to increase the desired DO level. In respect to BOD & COD the Aeration process is 90% efficient to keep the desired level.So, the Aeration process in the said paper mill seem to be one of the best solution for treatment of effluents containing pulp & cellulosic mater.
Recommendation
Liquid dosing may be adopted instead of Solid DAP and Ammonia.Treated water can be used for regular purposes in Industries’s guest houses & Quarters.Try to maintain the concentration of MLSS with in 3000 mg/Lt. to get desired DO level.In every shift One Aerator may be stopped sequence wise to decrease energy consumption.DAP & Urea should be used in 5:1 ratio for obtaining better result & efficiency.
References.ENVIRONMENTAL CHEMISTRY-B.K.SHARMAENVIRONMENTAL ENGINEERING – G.N PANDEY & G.C CARNEYENVIRONMENTAL SCIECCE- S.C SANTRAA TEXT BOOK OF ENVIRONMENTAL SCIENCE- GUHA BAKSHI , SEN, BANERJEEINDUSTRIAL WATER POLLUTION CONTROL, 3RD edition – W.WESLEY ECKENFELDERSulfate reduction at low pH to remediate acid mine drainage Sánchez-Andrea, I.ab , Sanz, J.L.a, Bijmans, M.F.M.c, Stams, A.J.M.bd Journal of Hazardous Materials Volume 269, 30 March 2014, Pages 98-109Treatment of effluents from palm oil mill process to achieve river water quality for reuse as recycled water in a zero emission systemOthman, M.R.a , Hassan, M.A.b , Shirai, Y.c , Baharuddin, A.S.a , Ali, A.A.M.c , Idris, J.d Journal of Cleaner Production Volume 67, 15 March 2014, Pages 58-61Removal of dye and chemical oxygen demand (COD) reduction from textile industrial wastewater using hybrid bioreactorsKatal, R.a, Zare, H.b, Rastegar, S.O.a, Mavaddat, P.a, Darzi, G.N.b Environmental Engineering and Management Journal Volume 13, Issue 1, 2014, Pages 43-50
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