Specifications for Units in Cyclic Actvated Sludge Process
1. Inlet Chamber
Designing, providing, and constructing RCC (M-250) inlet chamber for the peak low of 2 DWF including necessary
excavation in all types of strata including walkway all around the periphery.
Each compartment will have phosphor bronze steel gates with extension rod, head stock, operating wheels, GI pipe
railing, etc. The work includes providing and making necessary arrangements to connect the flow to screen chamber by
approach channel as directed and as per specifications.
2. Screen Chamber
Designing, providing, constructing, testing and commissioning of screen chamber, designed for average 1 DWF
and maximum peak flow of 2 DWF in RCC (M-250), including inlet pipe / channel from inlet chamber, outlet pipe
channel to detritus tank, free board of 0.5 m minimum, RCC walkway 1.2 m wide with GI pipe railing, RCC staircase
of 1.2 m width from GL to screen chamber.
3. Detritus Tank
Designing, providing and constructing continuous grit removal type Detritus Tank, mechanically operated in RCC
(M-250) capable of removing 100% of 0.2 mm size particle and above, having specific gravity 2.30, designed for one
peak 2 DWF with suitable arrangement of separation of grit from putrescible solids. Inlet and outlet channels of
required sizes as may be required to connect the flow to connecting unit etc. complete including hydraulic testing for
watertightness of structure having minimum FB of 0.3 m, washout arrangement to grit chamber and
platform 1.2 m wide RCC walkway with GI pipe handling shall be provided. A pit for collecting grit conveyed by conveyor
shall be provided. It should be suitable to handle the grit for carting. All arrangements shall be as detailed specifications and as directed.
4. CASP Basins
Designing, providing and constructing in RCC(M-250) CASP basins for biological removal of BOD along with nitrification, denitrification, Bio-P removal in compartments to handle combine flow of 1 DWF incoming flow and recirculation flow including construction of selector compartments and providing 1.2 m wide clear approach walkways, expansion joints wherever necessary, including foundations, etc as per specifications.
Peak factor shall be 2, F/M ratio shall be 0.15, complete with air blowers, fine diffused aeration grid / equipment and FB 0.5 m and SWD as required. DO level in basin to be minimum 2 mg/l complete with‘Oxygen Uptake Rate control system and all related instruments, stainless steel decanters and automation works MLSS concentrations shall be 2000-5500 mg/l or more. MLVSS to MLSS ratio to be 0.8. HRT shall be between 12 to 13 hrs and SRT suitable for fully digested sludge. It should have all other related works as per detailed specification. In case CASP is designed to achieve N,P removal HRT shall be between 15-18 hrs and SRT shall be suitably provided to a
5. Chlorine Contact Tank
Designing, providing and constructing chlorine contact chamber of adequate capacity to deal with 1 DWF average
flow. The chlorine contact tank should be 30 min capacity, during average flow to achieve 99.99% coliform reduction.
Chlorine dose shall be maintained as per standard provisions, including designing, providing and constructing
water supply provision for chlorination including providing dewatering and bypass arrangement, jointing to final effluent mains and outlet weir, etc complete. The effluent quality should match with the standards laid down by Maharashtra Water Pollution Control Board and as per obligatory provision and as detailed specification and as
directed by Engineer-in-charge.
6. Chlorinator and Chlorinator Room / Tonner Room
Designing, providing and constructing chlorinators vacuum type 2 Nos. with auto switchover facility and having capacity for dosage of adequate chlorine to ensure 99.99% coliform reduction as per obligatory provisions and detailed specifications with necessary provision of having chlorinator room of adequate size. The chlorinator equipment shall include cost of chlorine cylinders / tonner piping, valves, measuring and controlling equipments, safety devices, lifting equipments, etc. complete as per IS- 10553 (Part II) 1982. The tonner room should have minimum 3 MT capacity hoist for loading and unloading facility Tonner storage should be distinctly isolated and should be for minimum storage space as directed in the design specification and as per Gas Laws 1981 and Factory Act shall be provided. All other matching amenities shall be provided. 5 MT gantry rail shall be provided for full length of tonner room at 6 m height from level of tonner room, with outlet chamber and treated effluent outlet channel, etc. complete as per detailed specification.
7. Sludge Sump
Designing, providing and constructing of sludge sump and pump house of appropriate size with pumps, ceiling
height minimum 6 m over sump for discharging sludge to centrifuge using CI pipe, etc. complete as per detailed
specification.
8. Sludge Centrifuge Platform with Centrifuges
Designing, providing, constructing and installing including foundation etc sludge centrifuge to handle the sludge
flow of 1 day in 20 hours per unit with sludge dewatering unit, drain etc. complete as per specification. Sludge
centrifuges with the necessary arrangement as per detailed specification mentioned in tender and
obligatory provisions to be provided with satisfactory functioning.
9. OutfaIl Sewer
Designing, providing and constructing appropriate outfall sewer of RCC NP2 pipe, to discharge treated effluent from
outlet chamber after chlorination tank to the local nallah at the point shown on the drawing including necessary
chamber for inspection and cleaning including necessary excavation, dewatering, refilling, concrete encasing
/ bedding concrete steps to reach the nallah bed level, pitching and energy dissipation chamber in nallah portion,
etc. complete upto 50 m length RCC NP2 pipe line and including all above items.
10. Piping Work in CI-LA class including Sluice Valves, Reflux Valves, MS Gates
Providing, laying and jointing pipes other than those already included in the above items for interconnection, bypass
drains, etc. of all units including adequate number of manhole chambers.The item includes excavations, refilling and hydraulic testing of pipes, valves, gates accessories and cost of jointing
materials. The items includes required channels with gates for interconnection of units, bypass drains, etc. for all units
as directed, etc complete as per detailed specifications.
11. Administrative Building cum Laboratory (G+1)
Designing, providing and constructing administrative building, office cum laboratory including stores. This shall be a building having appropriate carpet area at ground floor and at first floor complete as per specifications including necessary excavation, foundation in RCC M-200 framed structure BB masonry (IInd class in C.M. 1:6), 20 mm cement plaster in CM 1:3 inside and outside painting. Aluminium door and window with glass panels, mosaic tile flooring and skirting and all other allied items, fixtures, fastening, electrification arrangement, water supply
arrangement, etc. complete
The building will have laboratory on upper floor of administrative building and should be so centralized that it should not be attached with any unit but should have complete control of every unit as per laboratory equipment,
beautification, telephone and intercom arrangement and wireless system.
