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of waste water generated. Hence the waste water treatment plant is designed for a capacity of treating 75 kld per day. EXPERIMENTAL PROGRAMME • At the first step, the waste water discharged from the various points are collected and transported to the common collecting tank. • The floating material and foreign particles in the raw water are removed by means of installing bar screens before the collecting tank. • The raw water is collected in the equalization tank after regular screening is over. • The homogenous effluents is pumped into the aeration tank, where surface fixed aerator is provided for aeration purpose. • The outlet from the aeration tank is fed into the settling tank by gravity. • The settled biomass is again recirculated back into the aeration tank to maintain the mixed liquor suspended solids. If the biomass is excess, it is sent to the sludge drying beds for dewatering. • The dewatered effluent is again collected in the collection cum equalization tank for further treatment. • The supernatant clear effluent from settling tank flows by gravity and collected in the semi treated effluent collection tank. • From the semi treated effluent tank, the effluent is pumped through the Pressure Sand Filter followed by Activated Carbon Filter for removal of fine suspended particles and colour present in the treated effluent. • The outlet from the activated carbon filter is found to meet the standard limits and let out for collecting in the storage tank. • The collected water is pumped for utilizing gardening purpose. The method of treatment of effluent is shown in flow chart. 404 WASTE WATER TREATMENT PLANT FLOW CHART BAR SCREEN COLLECTION TANK AERATION TANK SETTLING TANK TREATED EFFLUENT SUMP PRESSURE SAND FILTER ACTIVATED CARBON FILTER TREATED EFFLUENT GARDENING Re-cycle SLUDGE DRYING BED LABORATORY ANALYSIS The sample of raw water was collected from the collecting tank to analyze the basic characteristic of sewage. The sample of water collected was given to the Tamilnadu Water Supply and Drainage Board testing laboratory for analysis. The results are given in the Table 1. Table 1 : CHARACTERISTIC OF RAW WATER No. Parameter Characteristics Raw Sewage 1 PH 7.40 2 Total suspended solids 86 3 Total dissolved solids 1722 4 COD 184 5 BOD 75
After analyzing the characteristic of raw waste water, the treatment system was so designed and layout of effluent treatment plant is shown below. LAYOUT OF EFFLUENT TREATMENT PLANT 1 6 6 2 1. Inlet Chamber 6. Sludge drying bed 2. Collection cum 7. Pressure sand filter equalization tank 8. Activated Carbon 3. Aeration tank Filter 4. Settling tank 9. Storage sump 5. Treated effluent sump The sample of treated effluent was collected from the outlet of Activated Carbon Filter to analyze the characteristics of treated effluent. The tests are carried out and the results are given in Table 2. Table 2 CHARACTERISTIC OF TREATED WATER EFFLUENT No. Parameter Result TNPCB Standards 1 PH 7.2 6.5-7.5 2 Total suspended solids 26 < 30 mg/l 3 Total dissolved solids 1505 2100 mg/l 4 COD 108 250 mg/l 5 BOD 25 30 mg/l 3 9 4 5 7 8 � � � 405 CONCLUSION Comparing the actual results of treated effluent with Tamilnadu Pollution Control Board Standards, the treated effluent is meeting the standards of TNPCB and hence it is not harmful to the environment. The treated water can be used for gardening purpose and this will save the ground water from depletion and thus resulting effective usage of waste water. As water demands and environmental needs grow, water recycling play a greater role in our overall water supply. Water recycling has proven to be effective and successful in creating a new and reliable water supply. By working together to overcome obstacles, water recycling along with water conservation, can help us to conserve and sustainably manage our vital water resources ACKNOWLEDGEMENTS The authors are thankful to the Sona group of Institutions ( Thiagarajar Polytechnic College & Soan College of Technology ), Salem, Tamilnadu and Tamilnadu Water Supply and Drainage Board, water testing lab for their kind support for carrying out this case study. REFERENCES 1. Suresh.K. Dhameja, Environmental Engineering and Management, Published by S.K.Kataria and Sons, New Delhi.-pp110. 2. Ronald L. Droste, Theory and practice of water and wastewater treatment, John Wiley & sons publications- pp 219-234 3. Howard S. Peary, Donald R. Rowe, George Tehobanoglous, Environmental Enginneering, Mc Graw Hill Book Company- pp 302-314 4. Santhosh Kumar Garg- Sewage disposal and Air Pollution Engg. – Khanna publisher, New Delhi-pp 275-287
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National Seminar on Rainwater Harve
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once subsoil water starts draining
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The plantation process starts with
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DOLASANE , SANGAMNER RANGE I, SANGA
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Table 1. Present land use of waters
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the determination of specification
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Hydrological Parameters (mm) 140 12
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Drainage Engineering, 129(3): 184-1
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March to July, 2004 in the field si
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mm in 4 lph drip followed by 755.25
Page 23 and 24: Table 3 : Seasonal water use (mm) i
Page 25 and 26: National Seminar on Rainwater Harve
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Page 29 and 30: the base of the trench to assist dr
Page 31 and 32: SUDS (Sustainable Drainage Systems)
Page 33 and 34: Figure 3 : Cascade model of constru
Page 37 and 38: H eff = H R - H aq - H f ……..
Page 39 and 40: • Layers of gravel/media laid hor
Page 43 and 44: 1.3 % annually, and the total energ
Page 45 and 46: Figure 1a. Schematic diagram of sol
Page 47 and 48: Figure 5. Cross-section of partitio
Page 51 and 52: Fig. 1 (a) - (d) : Water Level Soun
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Page 57 and 58: Geology of Area The area is a part
Page 59 and 60: ground water recharge, which includ
Page 61 and 62: Table - 3 : Salient features of the
Page 69 and 70: eing 6.08, pH value of AB 3 and AB
Page 71 and 72: Table 2 : Tolerance limit for metal
Page 73: CASE STUDY The Salem Municipality i
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Page 79 and 80: Poly Electrolyte Dosing RAIN WATER
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Page 87 and 88: Water diversion Channel The work fo
Page 89 and 90: 04. Natural Water harvesting at Sol
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echarging , A study of world wide f
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these villages, the people themselv
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improve the quantity and the qualit
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The opinion of the public for the q
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in fact the base of energy in Tajik
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end of 80’s building of Roghun’
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consumption of oil on 11 times more
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change waterness charge o Vakhsh m
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are following: a) Compound of const
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for subsequent use of water for irr
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years. These beels can also be conv
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ody through water conservation and
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contribute to increased fish produc
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Figure 1 : Map of Bangladesh showin
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end uses and the intentional manage
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INTRODUCTION Indian water sector is
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ut definitely they are not substitu
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having the height greater than 50m
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ain. There is no conducive evidence
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chase food self sufficiency as a go
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REPORTB OF WORLD COMMISION ON DAMS
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