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HINDUSTAN UNILEVER LIMITED TATAPURAM FACTORY.
HINDUSTAN UNILEVER LIMITED TATAPURAM FACTORY.
INTRODUCTION Effluent treatment plant treats all domestic and process effluents. The treatment basically involves removal of fat oil & grease soap, Biological and chemical sludge using bacteria by aerobic treatment. Treated water is used for makeup in cooling tower and for gardening. TREATMENT PROCEDURE Domestic and lab effluent is collected in Equalization tank 2 (E-2) & Process effluent is collected in Equalization tank 1 (E-1). Process effluent from E-1 is transferred to E-2 so as to achieve a pH of 6 in E-2.Air is continuously bubbled using air blower for through mixing. From E-2 the pH corrected effluent is pumped to Aeration tank – 1 (A-1) with a constant flow. First stage of biological treatment takes place here. Aeration in the tank is provided by mechanical aerators (3 Nos), which are mounted on a platform. Effluent which over flows from A-1 reaches the Clarifier –1 (C –1). A scrapper pushes the sludge to the central sludge chamber. Return sludge pump from C-1 takes the sludge from the sludge chamber to A-1. Overflow from C-1 reaches Aeration tank –2 ( A-2) where the secondary biological treatment takes place which takes care
HINDUSTAN UNILEVER LIMITED TATAPURAM FACTORY. of the organic matter escaping from A-1. Three aerators are used in A-2 for aeration.
Over flow from A-2 reaches Clarifier –2 (C-2), a sludge return pump pumps back the sludge from the sludge chamber to A2. Overflow from C-2 enters a Flash mixer where provision for Alum and Poly electrolyte addition is provided. Over flow from the flash mixer flows by gravity in to Clarifloculator (CF). Effluent is agitated with paddles in the floculator rotated inside the clarifier. A rotating scrapper is used to push the sludge in the central sludge chamber. Sludge from CF is pumped to sludge drying bed using a pump everyday to remove the biological matter settled. Treated effluent from CF overflows to a collection tank. Water from the collection tank is filtered through pressure sand and carbon filters and used for makeup in cooling tower and gardening.
Eq. Ef f luent Via ac id Pit Tank Receiving PH 3.5 to 4.0 1 Sump FLOW = 132 m3/day pH = 5.0 t o 9.0 COD = 1992 m g/lit HCD = 1219 m g/lit T SS = 75 m g/lit Final effluent Ph – 6.5 -9.0
Eq. Tank 2
PH 8.5 - 9
San Ac tiv ated C arbon F ilter
Sle dge Drying
HINDUSTAN UNILEVER LIMITED TATAPURAM FACTORY. Chem ical L ab E ffluent = 1.0 cum /day Tank farm condensate 2 5 C UM /day
10 0 cum /hr @ 0.4 K g/C m 3
D FA plant E fflue nt.= 45 c um /day
10 0 cum /hr @ 0.4 K g/C m 3 A cid D ozing tank
- C ondensate from sm a ll and b ig ble eding tank = 20 cum /da y G lycerine e vapo rator Co ndensa te = 8 cum /day. - D FA coo ling Tow er bleed a nd pum p w ashing = 10 cum /da y. -
12 m 3/hr @ 12 2.0 HP m o to r
FAT T R AP
5 m 3/hr @ 16.0 hea d. 2.0 HP m o tor 2 nos.
6 m 3/hr.
BO D CO D
S oap P lant E fflue nt = 2 5 cum /d ay
F AT TR AP S .P C T Blee d = 1 0 cum /d ay S P W ashing = 5 cum /da y S crap s oap m elting = 4 cum /day M isc ellane ous E fflue nt = 6 cum /d ay
S w eage fro m w ork ers To ilet and C anteen E ffluent = 25 cum /da y.
FL O W - 132 m 3/day pH = 5.0 to 9.0 C O D = 19 92 m g/lit HC D = 12 19 m g/lit TS S = 7 5 m g/lit.
6 m 3/hr.
S e ptic tank
12 m 3/hr @ 12 2.0 HP m o to r B oile r blow dow n = 6 cum /day
R e frige ration C T = 5 cum /day
NaO C l D o sing 6 m 3/hr @ 30 .0 head 3 .0 HP M o tor - 2 nos,
10
TO O UT _L E T BO D < 50 m g/lit CO D < 25 0 m g/lit TSS < 50 m g /lit O il & g reas e < 10 m g /lit
6
9
13
7 8
F/m = 0 .050 L a = 24 4 m g/lit X t = 25 00 m g/lit V = 2 59 .7 7 m 3 DO = 2 m g /lit.
5.0 HP A era to rs - 3 no V 500 HD P 1 5 R ad ic on M ake
