Analysis of wastewater of (A.N.) leather industry

Category: Entertainment

Presentation Description

No description available.


Presentation Transcript

Analysis of wastewater of (A.N.) leather industry:

Analysis of wastewater of (A.N.) leather industry Presented by: Pankhury Tyagi (o34) Shilpi Mittal (046) Shushant (048) Shweta Singh(049) Vivek kr. Gupta(058)


WORKING OBJECTIVE Analysis of waste water produced Treatment of wastewater Preparing a case study Our suggestions


INTRODUCTION Leather industry is an ancient craft in India and has been practiced for many centuries at the village level. The leather and its related downstream industries can claim to be the world's largest industrial sector based upon a by-product. In the case of leather, the raw material is a by-product of the meat industry. The industry flourishes in conditions of natural advantage offered by a large cattle population, which supplies raw material(Hides and skin) accounting for 15% of cattle, 46% of buffalo, 17% of goat and 4% of sheep of the world. Hides and skins and their downstream products are vital earners of foreign exchange and they compare very well with the other agricultural commodities and, in fact, with any internationally traded commodities


ENVIRONMENTAL IMPACT The significance of the tanning industry to the environment is the high volumes of wastewater discharged in the process of converting a putrescible animal by-product into a stabilized and marketable material . The polluting nature of tanneries is evident from the notorious odor that characterizes tanneries and tannery zones. High in organic and inorganic suspended solids content accompanied by propensities for highoxygen demand and containing potentially toxic metal salt residues. At this high level water usage globally by the tanning industry is of the order of about 350 million m3/a .

Physical characteristics :

Physical characteristics

Solid content:

Solid content

Other physical characteristics :

Other physical characteristics

Chemical characterstics:

Chemical characterstics


pH The usual means of expressing the hydrogen-ion concentration is pH, which is defined as the negative logarithm of the hydrogen-ion concentration. pH = -log[H+] Observed pH = 8.7


B.O.D Biochemical oxygen demand It is the measure of biologically degradable organic matter. Reason of B.O.D test Oxygen required to stabilize organic matter. Determination on size of treatment facilities. Compliance with waste water discharge permits. B.O.D. = (Doi- Dof) df


C.O.D Chemical oxygen demand. It is the measure of oxidizable organic matter The COD test is used to measure the oxygen equivalent of the organic material in waste water that can be oxidized chemically using dichromate in an acid solution. COD(mg/l)=[ (A-B)*M*1000]/ml of sample


ALKALITINITY Alkalinity results from the presence of hydroxides, carbonates and bicarbonates of calcium, magnesium, sodium, potassium and ammonia. Alkalinity as CaCo3 = (3 meq * 50 mg CaCo3)/ (L * meq CaCo3)

Observed chemical characteristics :

Observed chemical characteristics CHROMIUM= 200mg/l

Standards for leather industry(as per cpcb):

Standards for leather industry(as per cpcb ) Inland Surface Waters Public Sewers Land irrigation Marine costal area Suspended solid mg/l 100 00 200 100 BOD mg/l 30 350 100 100 pH 6-9 6-9 6-9 6-9 Chloride as Cl mg/l 1000 1000 200 - Hexavalent chromium mg/l 0.1 .0.2 0.1 1.0 Total chromium as cr mg/l 2 2 2 2 Sulphides mg/l 2 5 - 5 Sodium % - 60 60 - Oil & grease mg/l 10 20 10 20

PowerPoint Presentation:


PowerPoint Presentation:

SOLID REMOVAL Most solids can be removed using simple sedimentation techniques with the solids recovered as slurry or sludge. Very fine solids and solids with densities close to the density of water pose special problems. In such case filtration may be required. Although flocculation may be used, using alum salts or the addition of polyelectrolysis.


ACTIVATED SLUDGE PROCESS Activated sludge is a biochemical process for treating sewage and industrial waste that uses air(or oxygen) and micro-organisms to biological oxidize organic pollutants,producing a waste sludge(or floc) containing the oxidizing material.


TRICKLING FILTER PROCESS A trickling filter process consists of bed of rocks,gravel,slag,peat moss or plastic media over which wastewater flows downwards and a contacts a layer of microbial slims covering the bed media. Aerobic conditions are maintained by forced air flowing through the bed or by natural convection air.The process involves adsorption of organic compounds in wastewater by the microbial slime layer, diffusion of air into the slime to provide the oxygen required for the biochemical oxidation of organic compounds.

Various uses of treated effluent :

Various uses of treated effluent Irrigation purpose washing of hide and skin Use to run the different units It can also be used as coolant.

PowerPoint Presentation:


PowerPoint Presentation:

As leather industries are one of the major causes of pollution in YAMUNA RIVER some innovative ideas like recovery of cromium, which, otherwise, poses great danger for YAMUNA can help in minimising their effect on water resoures including YAMUNA.

PowerPoint Presentation:

The process involve the chemical precipitation of chromium in the form of Cr(OH)3, with lime at a PH of 6.6 and separation of Cr(OH)3 either by filtration and generation of chrome sulphate solution. About 90% recovery of Cr. The recover chrome liquor is very well comparable to the freshly prepared liquors. The cost of recovery of Chromium is less then the cost of the fresh chrome powder. It cosiderably reduces the pollution load of tannery waste and save some amount of foreign exchange,as commercial chromium is usually imported from abroad.


CONCLUSION Water conservation : Reducing the usage of water through low float processing and operating batch rather than running washes does not perforce reduce the pollution load . It is also possible to preserve raw material for several weeks after irradiation by electron beam or gamma rays . It has been recognised that 'good housekeeping', process modification, reuse and recycling systems yield cost savings, while effluent treatment creates on-costs

authorStream Live Help