Rajasthan Urban Drinking Water Sewerage And Infrastructure Corporation Tender

PRIMARY TREATMENT

Inlet Chamber: Designing, providing, and constructing RCC (M:30) inlet chamber for the peak flow as per CPHEEO Manual including necessary excavation in all types of strata including walkway all around the periphery. Inlet chamber having minimum HRT of 60 seconds, each compartment will have steel gates with extension rod, head stock operating wheels. Gl 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 including Sewerage Pumping (If required).

Screen Chamber: Designing, providing, constructing, testing and commissioning of Two approach channels (min 4.5 m long), mechanically cleaned bar rack screen (6 mm clear opening 10 mm the flats), Escalator screens, with 100% standby manual fine screen (10 mm clear opening) MOC: SS316, Cl sluice gates (one before screen & one after screen), designed as per CPHEEO Manual in RCC (M-30), 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 stair case of 1.2 m width from GL to screen chamber, with operating platform and belt conveyor system incl. panel & push bottom switch at local level as well as MCC room for two way control.

Grit Chamber: Designing, providing and constructing grit Chamber- Detritus or vortex type or aerated type (100% standby), mechanically operated in RCC ( M 30) capable of removing 100% of 0.2 mm size particle and above, having specific gravity 2.65, HRT of 1 minute at average flow (Detritus Tank), horizontal velocity not exceeding 0.30 m/sec (Detritus Tank) at peak flow 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 water tightness of structure having minimum FB of 0.3 m, wash out arrangement to Grit chamber and platform 1.2 m wide RCC walkway with Gl 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.

Parshall flume having head loss limited to 0.15 m with necessary flow measuring devices/meter consisting of digital indicator in LPS & MLD

SECONDARY TREATMENT

Distribution Chamber Distribution chamber with CI/DI sluice gates for each basin of MBBR and bypass chamber, min. 3m x 2m of required depth, operating platform with CI/DI pipe to connect to MBBR basins. Bypass pipe from distribution chamber upto inlet of CCT shall be provided in RCC pipe with manholes and DI sluice gates.

MBBR Tank Minimum Total HRT of 6.0 hours (at average flow with Aerobic Detention Time - 4.5 Hrs & Anoxic Detention Time -1.5 Hrs), Designing. providing & constructing in RCC (M-30) biological reactor tank for removal of BOD and T-N to handle the average flow & having hydraulics suitable to handle peak flow conditions with suitable 1.2m wide walkway, expansion joints as required, including foundation etc as per specifications. The tank shall be equipped with inlet & outlet arrangement, process air blowers for supply of air, fine bubble diffusers of EPDM material/Coarse bubble aeration grid in SS-304, PP (virgin plastic material of minimum 600 m2 specific surface areal m3) carrier bio media etc. FB of 0.5m & SWD as required should be complete as per detailed specifications. The outlet of tank shall be provided with strainer (SS-304) for preventing escape of Media from the tank. (One unit upto 10 MLD and two units for more than 10 MLD) Air pipe of GI and Sub water pipe of SS316 material. Volume of the bio media shall not be less than 20% of the volume of the tank. Process air blowers of rotary twin lobe shall be capable of providing adequate oxygen for biological process to maintain minimum DO of 2 mg/lit in MBBR basin and also to keep media in suspension. In addition there would be internal sludge recirculation facility from Aerobic Tank to Anoxic Tank as per standard Design practice.

Process Air Blowers or aeration Device The Plant should be based on Dissolved Oxygen/Oxygen Uptake Rate Control with VFD driven Aeration Device. The Aeration System shall be designed for 110% Capacity of the design Air requirement. The aeration Blower/Aeration Device shall be having 100% installed standby unit. Air diffuser shall be of disk/ tubular type, fixed/retrievable. The wetted part of the aeration system of non-corrosive materials such as UPVC. Blowers shall be housed in process air blower building. The minimum area of the building is 20 sq.m. and height of 5m (min). The surface Aerators are not acceptable.

Secondary Clarifier Designing, providing & constructing in RCC (M-30) water tight secondary clarifier as per design guidelines by CPHEEO manual. The settler shall be provided with a scraper mechanism in MS with epoxy painting for collecting the settled solids at the bottom. The sludge will be collected in sludge sump by gravity & supernatant will flow over a weir & will be collected in a launder. Return Sludge Pump House - wet well with minimum HRT of 60 minutes upto flow of 80% of return sludge capacity and depth of sludge to be limited to 2m, separate panel room outside wet well, 100% standby pumps.

Raw sludge pump house Sump with minimum HRT of 30 minutes & depth of sludge limited to 2 m, 4.5 m minimum diameter, separate panel room outside the wet well

TERTIARY TREATMENT Coagulant Dosing System/Flash Mixer + Flocculation + Setting Tank/ Clariflocculator. The design values of the tertiary treatment units are to be considered from CPHEEO Manual on Water Supply & Treatment

Flash Mixer Rapid mixing device design confirming to IS: 7090 of 1985. Detention time 60 sec, velocity gradient 300-400 sec-1 with fans gear and motor assembly as per design.

Coagulant Dosing System Dosing Tanks-2Nos. With mixing, carrying, dosing with piping arrangement. Chemical Storage area as per data/specifications

Flocculation Tank RCC Hopper bottom units having slope 45 Deg as per hydraulic and process design with detention period 20 minutes with flocculator paddles with gear and motor assembly as per design. Flocculator design conforming to IS: 7208-1974 (Type-C). Surface loading rate 8000 liters/hour/sq.m and depth 2.5m using PVC media with supporting arrangement and sludge collecting pipes as per detail specifications.

Filter Feed Sump & Pumps

Pressure Sand Filters for STP capacities less than 10MLD

Rapid Sand Gravity Filters with shed Applicable to plant capacity above 10MLD only. Filter House (RCC framed structure with infill brick masonry walls) and RCC filter beds with sand and gravel bedding as per hydraulic and process design adopting 6000 Liters/hour/sq.m. Filtration rate with 2m water above sand media with under drainage system and inlet, outlet, backwash (rate 600LPM per Sq.m.) piping, pipe gallery, platform min. 5.5m in width and valves/gates arrangement as per design and detail specifications.

a. Filter Sand

Effective size 0.45 to 0.7 mm, uniformity coefficient not more than 1.7 nor less than 1.3, depth of sand 0.75m, free board 50cm, gravel 0.45m in depth, sand and gravel confirming to IS: 8491 (i)- 77, backwash by air wash (if specified) and hard wash by water, standard appurtenances (to be specified), rate of flow controller, filter gauge, sand expansion gauge, etc.

Wash Water Tank Wash Water tanks of capacity equal to 2% of designed quantity of filtered water in a day (+) 10% with 8 to 10 Mtr. Head (as specified)

Wash Water Pumps Wash Water Pumps with 100% Standby

Air Blowers Capable of delivering 750 to 833 LPM per sq.m of free air flow area at 0.35 to 0.4 Kg/sq m at the under drains (100% standby) (For capacity of PF more than 10 MLD)

Valves/gates Inlet, outlet, wash water inlet-outlet and all types and sizes of valves/gates as per design of specified make/brand.

All types gauges and meters required for filter operatins and backwashing etc.

The filtration systme could also be well tested cloth media disk filtration

DISINFECTION

Chlorine Contact Tank Designing, providing and constructing chlorine contact tank of adequate capacity to deal with average flow. The CCT shall have baffle walls for enhancing mixing of chlorine. One unit of two compartments, contact time 30 minutes of average flow to achieve 99.99% reduction in coliform Chlorine dosage shall be minimum 5 ppm provision including designing, providing & constructing water supply system for chlorination, chemicals preparation, domestic use, gardening etc. complete.

Chlorinator & Chlorinator Room / Tonner Room Designing, providing and constructing vacuum type chlorinators having adequate capacity for dosage of adequate chlorine to ensure 99.99% coliform reduction as per obligatory provisions detailed specifications with necessary provision of having chlorinator room of adequate size The chlorinator (min. 1W+1SB) equipment shall include chlorine cylinders, tonners, piping, valves, measuring controlling equipments, safety devices, lifting equipment, chlorine booster pumps (min. 1W+1SB) etc. complete as per IS-10553 (Part-II). The tonner room should have min 3 MT capacity crane for loading & unloading facility, neutralization pit. Tonner storage should be distinctly isolated and should have min. storage space for 15 days as per the detailed specifications & as per gas law & factory act shall be provided. Chlorination room of minimum 25 m2 area shall be provided. All other matching amenities shall be provided, 5 MT gantry rail shall be provided for full length of tonner room a 6 m Ht from level of tonner room with outlet.

Sludge Treatment

Gravity Sludge Thickener Solids loading rate of 25-35 kg/m2/day, Designing, providing & constructing watertight of sludge thickener-gravity type (picket fence) in RCC (M-30) with inlet & outlet pipes, central feed well, sludge it & sludge removal arrangement, grouting wherever necessary with walkway all around of 1.20m with GI pipe railing interconnecting Cl pipes all complete as per specifications, having bottom slope 1:6 & min. 4.5m SWD with necessary fixed bridge scraper arrangement as per detailed specifications & necessary inlet & outlet arrangement. All other arrangement as per detailed specifications. (One unit upto 10 MLD and two units for more than 10 MLD). Min sludge concentration in thickened sludge shall be 5%.

Sludge Holding Sump Minimum HRT of 4 hours, Designing, providing and constructing of sludge holding sump and pump for discharging sludge to centrifuge using Cl pipe complete as per detailed specification. Agitators/Mixers shall be provided in sump for keeping sludge in suspension. The pump shall be of Helical Screw pumps, 100% standby.

Sludge Dewatering Equipment Room with Centrifuge or belt press or screw press or Filter Press or Combi-machine or Bag Type: Designing, providing constructing and installing including foundation etc. Centrifuge or belt press or screw press or Filter Press or Combi- machine or bag Type to handle the sludge flow as per specifications, with appropriate inlet and outlet provision, sludge dewatering unit drain etc. Complete as per specifications.

Sludge/filtrate Pumps

a) Capacity to pump sludge in 1 hour with 100% standby (20-25% efficiency, "C" value to be adopted 50% than that of water to calculate friction loss)

b) Filtrate from thickening and dewatering to be conveyed only by PVC 10 kg/sq cm

Valves/gates

Inlet, outlet wash water inlet-only CI D/F and minimum size of 200 mm as per approved make/brand.

All types gauges and meters required for O & M as per design of specified make/brand.

Dewatering during entire work using any technique.

Necessary Instrumentation and control as per specifications

Outfall Sewer It shal be designed for peak flows. Designing, providing, constructing appropriate sized outfall sewer of RCC (NP2 class) pipe to dicharge treated effluent to the local water body/nallah at the point shown on the drawing including necessary chambers for inspection & cleaning including excavation, dewatering, refilling including appropriate bedding.

Piping work including Valves and Gates Providing, laying and jointing plant pipes as per specifications, including interconnection bypass arrangement etc. of treatment units including adequate numbers of manhole chambers. The item includes excavations, refilling & hydraulic testing of pipes, valves, gates, accessories & cost of jointing materials. The item includes required channels with gates or interconnection of units, etc. for all units as directed etc. complete as per detailed specifications. Sludge pipes shall be sized for maintaining minimum velocity for prevention of solids.

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 and ground floor and at first floor complete as per specifications including necessary excavation, foundation in RCC M 200 framed structure B. 8 masonry (11- class in C.M. 1:6) 20 mm cement plaster in C.M 1:3 inside and outside painting. Aluminium door and window with glass panels & SS wire mesh, mosaic tile flooring and skirting and all other allied items, fixtures fastening electrification arrangement water supply arrangement etc complete.

a) Ground floor to accommodate administrative office & laboratory

b) First floor to accommodate Office of the Plant In Charge, air monitoring equipments to measure wind direction & speed, hydrogen sulphide concentration etc.

Laboratory equipments Laboratory equipment (as per specifications), beautification, telephone and intercom arrangement and wireless system

Furniture and Office Equipments, Office furniture (Make: Godrej/or similar approved quality) as per specifications.

Ventilation and Safety equipments as per specifications

Sanitary blocks Capet area-15 square meter minimum up to 25 MLD and 25 square meter above 25 MLD (or as specified)

Maintenance Workshop of size as per specification

Air blower Building with Air Blowers: Capable of delivering adequate free air for aeration device with suitable pressure (100% standby).

MCC Room of minimum 9 m x 6 m clear inside with safety measures, approval of various statutory/central/foreign authority as applicable

Electric Installation: Both internal and external including entire plant area as per technical specifications. DG set shall be provided for min. 50% of electrical load on average flow condition. DG room shall be provided. Instrumentation shall be provided in the plant which includes level sensors, DO sensor, residual chlorine analyser, pressure gauges, flow meters, level switches, pressure indicating and temperature transmitters, alarms, etc. Maintenance workshop of size 5m x 4m x 3.5m shall be provided.

General Infrastructure Development: Scope also includes, Designing, providing and constructing general infrastructure development such as internal roads of minimum 6 mtr wide, compound wall for STP site, internal street and building lightings, pathways of minimum 1 m wide to access all STP units and Entrance Gate in MS fabrication, etc. all complete as per specifications and directed by engineering in charge.

Internal roads Asphalt road (Minimum 4.5 ) to connect all units from main gate of plot.

Compound Wall as per the plant layout, lohng the boundary of STP site (considering plant layout for intermediate and ultimediate and ulimate build out capacity and 33% landscaping area).

Green Belt (33% Landscaping area) as per specification

Outlet Parameters shall also include (TN10 ppm, Nh3N2 ppm and TP1 ppm) with full automation including PLC-SCADA and Instrumentation, Reuse arrangement including Storage i.e GLR (2 Hours pumping on average flow) , OHSR (4 Hours pumping on average flow) and Pumps of required capacity with all necessary attachments.

1.0 MLD Sewage Treatment Plant based on MBBR technology

Fix Provision for O&M of all facilities created under this contract including but not limited to Sewer Line System, SPS/MWP and STP, and sewerage network for Ten Years as per Tender Document (yearwise payment amount is given in tender document) for Pokaran Town Bidder should fill amount Rs. 66983971.00 Bidder should fill this amount in case any other amount is filled then it will be consider as Rs. 66983971.00 only.

Provision of Provisional Sum to be used as per Tender Document (FIXED) for Pokaran Town Bidder should fill amount Rs. 10100000.00 Bidder should fill this amount in case any other amount is filled then it will be consider as Rs. 10100000.00 only.