Post on 14-Apr-2017
1 Kanuwana,Ja-ela.
LANKEM CEYLON (PLC)ROBBIALAC PAINTS
Presented by :C.D.Karunasena Internal supervisor : Prof. R.M.G.RajapakseExternal supervisor : Mr. S.K.Fernando
2 Projects assigned
Determination of chemical oxygen demand Determination of biological oxygen demand Determination of total suspended solids
3 Wastewater treatment process• Industrial effluents should be well treated prior to
release in to water resources in order to prevent environmental pollution.
• Industries practice good wastewater treatment
• Waste water treatment process is employed.
4 Wastewater treatment process
Quantitative measures of wastewater condition
• Industrial effluents should be well treated prior to release in to water resources in order to prevent environmental pollution.
• Biological oxygen demand (BOD)• Chemical oxygen demand (COD)
• Total suspended solids (TSS)
• Industries practice good wastewater treatment
• Waste water treatment process is employed.
5 Wastewater treatment process
Components Preliminary treatment Secondary treatment Tertiary treatment Disinfection.
• Industrial effluents should be well treated prior to release in to water resources in order to prevent environmental pollution.
• Industries practice good wastewater treatment
• Waste water treatment process is employed.
6 Wastewater treatment process
Preliminary treatment
• In primary treatment, the incoming flow is slowed in large tanks which allow the dirt, gravel, and other heavier-than-water components of the waste stream to settle out. Grease, oil, and other floatables are also removed here.
• Coagulants and flocculants treated
7 Wastewater treatment process
Secondary treatment
• Removes the residual organics and suspended solids.
• Aerobic biological treatment processes.
• Aerobic biological treatment is performed in the presence of oxygen by aerobic microorganisms that metabolize the organic matter in the wastewater, thereby producing more microorganisms and inorganic end-products (principally CO2, NH3, and H2O).
8 Wastewater treatment process
Tertiary treatment
• This is employed when specific wastewater constituents which cannot be removed by secondary treatment must be removed.
• Individual treatment processes are necessary to
remove nitrogen, phosphorus, additional suspended solids, refractory organics, heavy metals and dissolved solids.
9 Wastewater treatment process
Disinfection
• Disinfection is the final step in the sewage treatment process and is designed to kill enteropathogenic bacteria and viruses that were not eliminated during the previous stages of treatment.
10 Wastewater treatment processWastewater treatment area in Lankem paints
Primary settling tanks
11 Wastewater treatment processWastewater treatment area in Lankem paints
Primary settling tanks
12 Wastewater treatment processWastewater treatment area in Lankem paints
Tube settler
13 Wastewater treatment processWastewater treatment area in Lankem paints
Sand filtration tank
14 Projects assigned
Determination of chemical oxygen demand Determination of biological oxygen demand Determination of total suspended solids
15 Projects assigned
Determination of chemical oxygen demand Determination of biological oxygen demand Determination of total suspended solids
16 Chemical oxygen demand determination of wastewater effluent sample
• Chemical oxygen demand (COD) is a measure of the organic matter content that is susceptible to oxidation by dissolved oxygen.
• Oxidative action of oxygen is resembled by the strong oxidant potassium dichromate K2Cr2O7
17 Chemical oxygen demand determination of wastewater effluent sample
The organic chemical content is oxidized by using dichromate resembling the action of oxidation by oxygen.
Known amount of dichromate is added in excess to a known volume of sample and allowed to react with all organic matter present.
After reaction remaining dichromate is determined by back titration with standard FAS(ferrous ammonium sulfate) solution in the presence of ferroin indicator.
Dichromate sulfate reflux method
18 Chemical oxygen demand determination of wastewater effluent sample
Standard potassium dichromate solutuion : 0.0417 M(primary standard grade)
Sulfuric acid reagent Standard ferrous ammonium sulfate(FAS) titrant :
Aproximately 0.25M Ferroin indicator HgSO4 (Mercuric sulfate) Potassiumhydrogen phthalate(KHP)
Reagents
19 Chemical oxygen demand determination of wastewater effluent sample
Dichromate reflux method A
fter cooling down the mixture was diluted to twice with distilled water
Procedure
Finally was titrated against standard FAS solution the color change from blue-green to reddish brown.
Similar procedure was performed for a blank solution.
20 Chemical oxygen demand determination of wastewater effluent sample
Dichromate reflux method
Organic matter + O2 ----------------->x CO2 + y H2O
If organic matter is oxidized by acid Cr2O72-
2/3 Cr2O72- + 4e +28/3H+ ---------->4/3Cr3+ + 14/3 H2O
Oxygen reduced to water oxidizing the organic matter O2 + 4e- + 4H+ --------------------->2H2O
21 Chemical oxygen demand determination of wastewater effluent sample
Dichromate reflux method
O2 + 4e- +4H+ ---------------> 2H2O
Cr2O72- + 14H+ +6e- ------>2Cr3+ + 7H2O
2/3 Cr2O7
2- = O2
22 Chemical oxygen demand determination of wastewater effluent sample
Dichromate reflux method
Back titration with FAS
Cr2O72-+ 14H+ + 6Fe2+ ------------->2Cr3+ + 7H2O + 6Fe3+
stoichiometric ratio Cr2O72- : Fe2+ = 1:6
23 Chemical oxygen demand determination of wastewater effluent sample
Dichromate reflux method
End point determined by Ferroin indicator
Color change blue-green to reddish brown.
24 Chemical oxygen demand determination of wastewater effluent sample
Dichromate reflux methodBurette readings obtained
Titrant with standard dichromate solution
Initial burette reading/cm3
Final burette reading/cm3
Difference/cm3
FAS 0.00 10.60 10.60
Blank 0.00 12.45 12.45Sample 0.00 22.20 22.20
25 Chemical oxygen demand determination of wastewater effluent sample
Dichromate reflux methodResults
The COD of effluent sample = 4084.91 ppm Maximum allowed(Central Environmental Authority) = 250.00 ppm
26 Projects assigned
Determination of chemical oxygen demand Determination of biological oxygen demand Determination of total suspended solids
27 Projects assigned
Determination of chemical oxygen demand Determination of biological oxygen demand Determination of total suspended solids
28 Biological oxygen demand determination of wastewater effluent sample
Biological oxygen demand is a quantitative measure of the presence of microorganisms in the water sample that are responsible for the consumption of dissolved oxygen for their metabolism.
29 Biological oxygen demand determination of wastewater effluent sample
Measured by using conventional titrimetric method oxygen demanded by microorganisms soon after the
sample was taken out was measured oxygen demanded by microorganisms after five days’
time in the water was determined BOD determined for 5 days by subtracting the oxygen
demand values
30 Biological oxygen demand determination of wastewater effluent sample
MnSO4 solution :4.80 g of MnSO4.4H2O and diluted upto 10 ml
Alkali-iodide–azide reagent: by dissolving 5.00 g of NaOH and 1.35 g NaI and adding it to
dissolved 0.01 NaN3 and diluted upto 10 ml water. Starch indicator Standard Thiosulfate solution of 0.025 M
Reagents:
31 Biological oxygen demand determination of wastewater effluent sample
Procedure:The amber colored bottle was allowed to incubate for five days without fixing and after that by adding MnSO4 solution and alkil-iodide-azide O2 was fixed.
Both the fixed solutions were treated with conc H2SO4 minimum amount to dissolve the precipitate
Finally were titrated against standard S2O32-
solution
32 Biological oxygen demand determination of wastewater effluent sample
2(Mn2+ ------------------------- > Mn4+ + 2e) in alkali O2 + 2H2O + 4e ------------- > 4OH- 2Mn2+ + O2 + 2H2O ------ > 2Mn4+ + 4OH-
Formed Mn4+ ions are then precipitated as MnO2.2H2O
Reactions:
33 Biological oxygen demand determination of wastewater effluent sample
By adding conc H2SO4 followed by KI this precipitate is dissolved generating I2 which can be then determined by titrating with Na2S2O3
MnO2 + 4H+ 2e- ----------- > Mn2+ + 2H2O2I- ------------------------------ > I2 + 2e-________________ MnO2 + 2I- +4H+ ---------- > I2 + Mn2+ + 2H2OI2 + 2S2O3
2- ------------------ > 2I- + 2S2O32-
Reactions:
34 Biological oxygen demand determination of wastewater effluent sample
Readings obtained:
Trial Initial burette reading/ml
Final burette reading/ml
Difference/ml
Standardization of S2O3
2-0.00 9.80 9.80
Colorless bottle
9.80 24.20 14.40
Amber colored bottle
24.20 31.00 5.80
35 Biological oxygen demand determination of wastewater effluent sample
Biological oxygen demand of the sample = 67.33 ppm
Maximum allowed(Central Environmental Authority) = 30.00 ppm
Results:
36 Projects assigned
Determination of chemical oxygen demand Determination of biological oxygen demand Determination of total suspended solids
37 Projects assigned
Determination of chemical oxygen demand Determination of biological oxygen demand Determination of total suspended solids
38 Determination of total suspended solids(TSS) in waste water sample
• TSS can be conveniently determined by using a glass microfiber filter paper.
• Sample along with suspended solids can be filtered to the filter paper and the dry mass increase quantitatively gives a measure for the TSS in ppm.
39 Determination of total suspended solids(TSS) in waste water sample
• TSS can be conveniently determined by using a glass microfiber filter paper.
• Sample along with suspended solids can be filtered to the filter paper and the dry mass increase quantitatively gives a measure for the TSS in ppm.
40 Determination of total suspended solids(TSS) in waste water sample
• TSS can be conveniently determined by using a glass microfiber filter paper.
Facilitates fine particle retention and high flow rate
Good loading capacity
Pore size 0.7 µm
41 Determination of total suspended solids(TSS) in waste water sampleProcedure:
Next the filter paper was dried again in oven for 20 min
The dry mass was weighed.
42 Determination of total suspended solids(TSS) in waste water sampleProcedure:
Filtration apparatus used for the filtering of suspended solids
43 Determination of total suspended solids(TSS) in waste water sampleReadings:Dry mass of filter paper before filtering/g
Dry mass of filter paper after filtering/g
Mass of suspended solids/g
0.0948 0.1120 0.0172
44 Determination of total suspended solids(TSS) in waste water sampleResults:
TSS of the effluent sample = 172.0 ppm
Maximum allowed (Central Environmental Authority) = 50.0 ppm
45 Determination of total suspended solids(TSS) in waste water sample
Conclusion
Current water treatment procedure employed is not sufficient and exceeds the maximum recommended by Central Environmental Authority
46 Suggestions for decreasing COD, BOD, TSS Moving on to a better primary treatment
Introduction of a new sand filtration method
47 Suggestions for decreasing COD, BOD, TSS Moving on to a better primary treatment• Usage of polyaluminium chloride instead of alum or ferric chloride
0.15 g/250.0 ml 0.15 g/250.0 ml 0.15 g/250.0 ml FeCl3 Alum PACl
48 Suggestions for decreasing COD, BOD, TSS Introduction of a sand filtration method
• Sand filtration greatly reduces COD,BOD and TSS
49 References
• Apha method for COD,BOD determination
• Kemmer, Frank N. (1979). The Nalco Water Handbook. Pages 230-238
• Patterson, James W. (1980). Wastewater Treatment Technology
• http://www.cea.lk/web/index.php/en
50
Thank you!
External supervisor : Mr. S.K.FernandoInternal supervisor : Prof. R.M.G.Rajapakse
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53 Projects assigned
Chemical oxygen demand determination Biological oxygen demand determination Total suspended solids determination
Water vapor permeability test for two weather coating products
54 Projects assigned
Chemical oxygen demand determination Biological oxygen demand determination Total suspended solids determination
Water vapor permeability test for two weather coating products
55 Determination of water vapor permeability of thin films of two Robbialac paint coating products
Water vapor permeability of thin paint films is determined using upright cup method.
Color of silica gel is used to detect water vapor passage through the film.
Dry silica gel is blue in color whereas it turns pink upon absorption of water.
56 Determination of water vapor permeability of thin films of two Robbialac paint coating products
Procedure Two coating products were taken and four thin films were made which are
2.5mm in thickness easysil 505 treated and the standard.
1. Aquatuff standard 2. Aquatuff trial(esasil 505 treated) 3. Weathercoat standard 4. Weathercoat trial(esasil 505 treated)
57 Determination of water vapor permeability of thin films of two Robbialac paint coating products
Procedure Silica gel was dried in oven for 4 hours and 10 g of blue beads were
placed in four identical 100ml beakers and was quickly covered airtight with the films 1 to 4 respectively.
Then all the four labeled beakers were sealed with grease and were placed in a water vapor saturated chamber for two days
The color change were noted qualitatively
58 Determination of water vapor permeability of thin films of two Robbialac paint coating products
Procedure
59 Determination of water vapor permeability of thin films of two Robbialac paint coating productsResults
Before After
Aquatuff
Weathercoat
60 Determination of water vapor permeability of thin films of two Robbialac paint coating products
Conclusion
• Weathercoat has more water vapor permeability than Aquatuff
• Adding easasil 505 additive increases water vapor permeability