Accepted Papers - 3.pdf - UNESCO

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3. Sewage Water Recycling System The objective of industrial liquid Sewage treatment plant (STP) is to treat the canteen waste and sewage from the power plants to meet environmental regulations and use the treated water for horticulture, thus reducing the load on the raw water from the river and the residue for land filling as a manure. In NALCO CPP, for an employee strength of 3000 (including Contract worker) and for nearly 100 quarters in the Vidyut Nagar Township around 18 M 3 /hr sewage water is generated. The internal canteen and kiosks are generating around 3 M 3 /hr of canteen waste. The sewage Water recycling system is installed to recycle back 8 M 3 /hr of water from this area . After primary treatment at the source of their generation of the canteen waste by Garbodrain , the effluents are sent to the STP for further treatment along with the sewage. The composite liquid effluent treatment plant has been designed to treat all liquid effluents, which originate within the power station and re-circulation of the treated effluent for various plant uses mainly for coal yard fire quenching and Horticulture purpose. The Capacity of the system is as below - a) FLOW : i) Canteen Waste - 3 M3 / hr ii) Sewage Flow - 18 M3 / hr Total - 21 M3 / hr b) RAW EFFLUENT CHARACTERISTICS : i) Canteen Waste Water BOD 500 mg/lit SS 600 mg/lit Oil & Grease 50 – 100 mg / lit ii) Combined Waste Water BOD 600 mg/lit SS 1000 - 1500 mg/lit Oil & Grease 600 mg / lit 410 c)TREATED EFFLENT CHARACTERISTICS: pH 7 – 7.5 BOD < 30 mg/lit COD < 250 mg /Lit SS 100 mg/lit Oil & Grease < 10 mg / lit DO 0.20 mg/ Lit Residual Free Chlorine 1 mg/ Lit Process Description The canteen waste is processed through a GARBODRAIN, where the screened solids, grits and other kitchen waste are ground and then led to the BAR SCREEN –I. There, the Canteen wastewater is screened off and the floating matter is collected in a channel fitted with fine bar screen. The bar Screen consists of equispaced parallel bars inclined to horizontal. The screenings arrested on Bar Screens are raked manually at intervals. The raked screenings are collected on perforated platform to allow effluent to drip in to the channels. The semi-dried screenings are then carted out for land filling or incinerated. The canteen waste water is then conveyed to the GRIT REMOVAL CHANNEL, designed to remove grit consisting of sand, gravel or other heavy solids. The GRIT REMOVAL CHANNEL constructed in RCC is designed to maintain horizontal velocity close to 0.6 m/sec. so as to settle the grit particles to bottom of the channel. Settled grits are scooped manually from bottom and collected in a wheel barrow and disposed off as land filling. The degrited canteen waste water is then passed to OIL REMOVAL UNIT for removal of oil. It consists of baffles and an Oil skimming pipe to skim off the floating oil into an oil drum. The raw sewage along with preliminary treated canteen waste water is screened Off in the BAR SCREEN-II .As in BAR SCREEN -1,,the screenings are arrested on bar screen and raked manually at interval depending on clogging frequency. The raked screenings are collected on perforated platform to allow sewage to drip in to the channels. The semidried screenings are then carted out for land filing or incinerated. The waste water is then
Canteen Waste Garbo-drain Bar Screen -1 Grit Removal Channel-1 Chemical Dozing (Chlorine) Oil Removal unit V NOTCH Treated Water 8 cub M/hr conveyed to the GRIT REMOVAL CHANNEL- II, where grit consisting of sand, gravel, cinder or heavy solids are allowed to settle and are scooped out manually and used for land filling. Waste water is then led by gravity to the underground equalization Tank, where the contents are equalized by mixing action of FLOATING AERATOR and then led to AERATION TANK. In the Aeration tank, the microbes, biodegrades, the organic matter collected thus populating themselves and partly converting it Sewage From Toilets Sewage Collection Chamber BAR SCREEN - II GRIT REMOVAL CHANNEL _II Equalization Tank Raw Sewage Pump Aeration tank Secondary Clarifier 411 Sludge Pump SDB to end products like CO 2 , H 2 O etc, thus reducing BOD of the settled waste water. The Floating aerator spurge the water in air, there by producing droplets, which absorb the oxygen from atmosphere. The contents of the aeration tank is lead to the SECONDARY CLARIFIER for removal of suspended solids (MLSS).The underflow of the secondary clarifier is recycled back to aeration tank by SLUDGE RECYCLE PUMPS
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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
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Table 3 : Seasonal water use (mm) i
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pinnata) Aquatic plants are represe
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Page 31 and 32: SUDS (Sustainable Drainage Systems)
Page 33 and 34: Figure 3 : Cascade model of constru
Page 35 and 36: National Seminar on Rainwater Harve
Page 37 and 38: H eff = H R - H aq - H f ……..
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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
Page 53 and 54: farms and industries hope to get ad
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 and 74: CASE STUDY The Salem Municipality i
Page 75 and 76: After analyzing the characteristic
Page 77 and 78: 1. Ash Pond water recycling System
Page 79: Poly Electrolyte Dosing RAIN WATER
Page 83 and 84: SERVICE WATER FOR SPAYING COAL CRUS
Page 85 and 86: In coastal areas of Gujarat, the vi
Page 87 and 88: Water diversion Channel The work fo
Page 89 and 90: 04. Natural Water harvesting at Sol
Page 91 and 92: Work Done Storage No. of Area No. o
Page 93 and 94: Conclusions The process of rainwate
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Page 105 and 106: Ground Water Conservation Technique
Page 107 and 108: anging from 37-60% of recommended d
Page 109 and 110: given priority before implementatio
Page 111 and 112: was having potential to irrigate 15
Page 113 and 114: water, use of improved seed and bal
Page 115 and 116: the result of the success they have
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Page 121 and 122: harvest will certainly solve the wa
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Page 125 and 126: echarging , A study of world wide f
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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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Accepted Papers - 3.pdf - UNESCO

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