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DESIGN OF SMALL SCALE WASTE WATER (GREY WATER) TREATMENT PLANT

KrishiKosh

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Title DESIGN OF SMALL SCALE WASTE WATER (GREY WATER) TREATMENT PLANT
 
Creator JUVEKAR, PRANATI RAMESH
 
Contributor Patil, S. T.
 
Subject null
 
Description India is facing a water crisis and by 2025 it is estimated that India‟s population will be suffering from severe water scarcity. There is a great challenge ahead to produce more food for increasing population using less water as agriculture sector has to release fresh water to meet the enhanced requirement of other sectors such as domestic and industrial. Contrarily, increasing urbanization is resulting in increased domestic waste water generation, which is mainly disposed as untreated. Currently, partially treated and untreated waste water is discharged into rivers or on lands causing various environmental problems. On the other hand, waste water would be beneficial in case it is scientifically used for irrigation as it can act as an important source of water and nutrient (Pescod, 1992).
The present investigation was carried out on the grey water of Jayaprabha girl‟s hostel of DBSKKV, Dapoli. The capacity of Jayaprabha girl‟s hostel is 350 girl‟s in 150 rooms in two wings. The average daily consumption of water is around 10,000 liter per day for each wing. The grey water is carried through pipe drain up to disposal of natural drain. The elevation difference from Jayaprabha hostel and natural drain is 1.5m and length of pipe drain is 110 m, respectively. The present investigation was undertaken with view to study physical and chemical parameters of domestic grey water and to design small scale waste water treatment plant for Jayaprabha girl‟s hostel of Dr. BSKKV, Dapoli. The treated water can be used for irrigating horticultural crops as well as gardens. The grey water generated from bathrooms, basins and kitchen of the Jayaprabha hostel were analyzed by using different media during December to February, 2015.
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Grey water sample filtered through individual filtration media which were easily available such as gravel, grit, sand and broken brick at the depth of 45cm, 30cm and 15 cm respectively. These results were analyzed for individual filtration media at the depth of 45cm, 30cm, and 15cm for selection of media and its efficient depth. After selection of efficient depth of layers installed small scale filtration unit. This grey water treatment plant is a combination of natural and physical operations. All the natural and easily available low cost materials were used for the treatment process. After that analyzed physical and chemical properties of treated grey water for combination of filtration media, along with charcoal, water quality was decided.
The physical and chemical properties of untreated and treated water were determined. Under physical properties, temperature, color, turbidity and odour were studied. The effect of media and depth on various chemical properties as pH, EC, TDS, potassium, calcium, carbonates and bicarbonates, magnesium, nitrogen, sodium, SAR, RSC, oil and grease, BOD and COD were fund out. The results of analysis were used for design of small scale waste water treatment plant.
The small scale grey water filtration model was designed by using engineering parameters as porosity (ɳ), voids ratio (e), dry bulk density (ƍb) and wet bulk density (ƍw), hydraulic conductivity and interstitial velocity (Va). The media used were sand (0.42 mm), grit (6-8mm), gravel (15-25 mm), broken brick (25-30 mm) and charcoal (12-16 mm). As sand had fine particle size among all media. The particle size was decided on effective size d10 i.e. 0.42 mm and uniformity coefficient (Cu) 2.2 for uniform filtration. The porosity of sand, grit, gravel, broken brick and charcoal were 39, 37, 32, 31 and 38 per cent respectively. The depth of the media were determined by filtering grey water through selected media at 15, 30 and 45 cm and its effect on physical and chemical properties of grey water were determined. The most effective combination of media found were 45 cm sand, 45 cm grit, 15 cm gravel, 30 cm broken brick and 30 cm charcoal respectively. The designed model was tested by gradient 0.83m. The estimated interstitial velocity of flow through combination of media considering particularly for sand was 9.7 m.day-1. The capacity of designed model was 0.022 m3.day-1 for filtration area of 6.35×10-3 m2 and 1.8 m depth of media. The depth sequence and particle size of media will be constant for design of higher capacity filter. The only surface area will increase or decrease according to capacity.
This filtration unit or model showed the better and effective performance by the experiment and balances the advantages and disadvantages of the system. As per the
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Indian Standards, the treated water can use for landscaping, gardening and irrigation on horticultural crops.
 
Date 2017-11-15T06:10:52Z
2017-11-15T06:10:52Z
2015-09
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/5810035737
 
Language en
 
Format application/pdf
 
Publisher DBSKKV., Dapoli