COMPREHENSIVE MAINT OF SEWAGE TREATMENT PLANT A B AT INS RAJALI ARAKKONAM UNDER GE M ARAKKONAM

Comprehensive maintenance of sewage Treatment plant of cap 280 KLD installed at Site 'A' at Arakkonam comprising the following assets, including all associated civil structures, chambers, connected equipment, control panels, cabling, complete all as specified and as directed: Raw Sewage collection well - 01 No, Equity tank - 1 No, Bar screen chamber - 1 No, MBBR based Aeration tank- 1 No, Primary clarifier tank - 1 No, Secondary clarifier tank - 1 No, Filter feed tank - 1 No, Treated water tank - 1 No, Sludge holding tank - 1 No, Sludge drying bed with 04 compartment - 1 No, Submersible sewage cutter pump – 3 HP, 3 phase, 415 V – 04 Nos, Air blower – 7.5 HP, 3 phase, 415 V – 02 Nos, Rake arm Assembly with Gear Box and motor of cap 2 HP each in primary and secondary clarifier - 02 Nos, Reactivated Sludge monoblock pumpset of cap 1 HP - 2 Nos, Filter feed monoblock pumpset of cap 05 HP - 02 Nos, Filter press feed pumpset 1.5 HP - 02 Nos, Hydraulic filter press system with motor 01 HP - 1 No, Treated water monoblock pump set – 15 HP, 3 phase, 415 V – 02 Nos, Pressure Sand filter unit – 01 No, Activated carbon filter - 01 No, Chlorine dosing pump - 2 Nos, and Including maintenance of all electrical, mechanical, instrumentation components, control panel boards including MCCBs, starters of any type & size, cables, connected accessories, and all incidental works necessary for proper functioning of the STP.

Comprehensive maintenance of sewage Treatment plant of cap 1250 KLD installed at Site 'B' at Arakkonam comprising the following assets, including all associated civil structures, chambers, connected equipment, control panels, cabling, complete all as specified and as directed: Raw Sewage collection well - 01 No, Bar screen chamber - 1 No, Settling tank - 1 No, MBBR based Aeration tank- 1 No, Primary clarifier tank - 1 No, Secondary clarifier tank - 1 No, Filter feed tank - 1 No, Treated water tank - 1 No, Sludge holding tank - 1 No, Sludge drying bed with 04 compartment - 1 No, Submersible sewage cutter pump – 7.5 HP, 3 phase, 415 V – 02 Nos, Air blower – 12.5 HP, 3 phase, 415 V – 04 Nos, Rake arm Assembly with Gear Box and motor of cap 2 HP each in primary and secondary clarifier - 02 Nos, Reactivated Sludge monoblock pumpset of cap 2 HP - 2 Nos, Filter feed monoblock pumpset of cap 10 HP - 02 Nos, Filter press feed pumpset 2 HP - 02 Nos, Hydraulic filter press system with motor 1.5 HP - 1 No, Treated water monoblock pump set – 10 HP, 3 phase, 415 V – 02 Nos, Pressure Sand filter unit – 01 No, Activated carbon filter - 01 No, Chlorine dosing pump - 2 Nos, and including maintenance of all electrical, mechanical, instrumentation components, control panel boards panel boards including MCCBs, starters of any type & size, cables, connected accessories, and all incidental works necessary for proper functioning of the STP.

The following scope of comprehensive maint is as under for item No 01 & 02 above:- (a) The parameters of input and output shall be maintained as under :- Inlet parameters: (i) BOD - 250-275 mg/ltr (ii) COD - 400-550 mg/ltr (iii) TSS - 400 mg/ltr (iv) PH - 7 to 7.5 (v) Fecal Coliform - < 230

Parameters for treated sewage effluent required are as:- (i) BOD -Less than or equal to 10 mg/Itr (ii) COD -Less than or equal to 150 mg/ltr (iii) TSS -< 30 mg/ltr ` (iv) PH -7 to 8 (v) E coli - Less than or equal to 100 counts/100 ml (vi) Residual chlorine ->0.5mg/Itr (iv) DO (Dissolved oxygen level - 2 to 4 mg/ Itr in biological system to be maintained)

(b) The following weekly maintenance to be carried out STP system is inspected weekly and the following points attended to :- (i) Inspect Equalisation Tank/Entry to system for blockages, plastics etc and remove. (ii) Inspect Aeration, recirculation flow and if any mal odour, it is to be treated. (iii) Inspect Secondary clarifier and note visual appearance of final effluent and absence (or otherwise) of sludge build up. Check the outlet of the system for blockage etc. (iv) Grease the bearings (v) Grease all chain couplings through casing nipples. (vi) Check oil level in air blower, gear boxes and hydraulic system and top up if required. (vii) Check shaft for wear and alignment (viii) Check bearings for wear and tear and check holding down bolts for tightness (xi) Check chain coupling and check bolts for tightness.

(c) The following monthly maintenance to be carried out- i) Check motor for overheating (by touch) and remove dust etc. from air fins. ii) Grease all bearings through nipples. iii) Grease all chain couplings through casing nipples. iv) Check oil level in air blower and replace. v) Apply light lubricating oil in small quantities to locks and hinges. vi) Sludge disposal outside the campus atleast once in a month. vii) check dozing pump and repair/service if necessary. (viii) Inlet and outlet analysis parameter report tested by NABL approved lab once in a month to be submitted as per designed parameters / CPCB norms

(d) The following items for routine maintenance shall be provided in plant :- (i) Liquid chlorine with suitable % of chlorine concentration as recommended by manufacturer Per year - 3360 ltrs for Site 'A' and 15650 ltrs for Site 'B' (ii) Blower Oil - 24 ltrs for site 'A' and 120 ltrs for Site 'B'. (iii) Gear box oil - 24 ltrs for site 'A' and 24 ltrs for site 'B' (iv) Hydraulic 68 oil - 80 ltrs for site 'A' and 80 ltrs for site 'B' (v) Grease - 15 kgs for Site 'A' and 15 Kgs for Site 'B' (vi ) Hand gloves, Consumable [Including Lab Chemicals] (vii) Cleaning of treated water tank shall be done once in a year

(e) The following items shall be replaced as and when required or as directed by the Engr-in-Charge :- (i) Gaskets and gland packing (ii) O-rings (iii) Drive belts for air blower and clarifier. (iv) Minor Electrical accessories viz indication lamps, fuses etc or any other spares left out as required. (v) Blades (vi) Pasting materials (vii) Consumables like gloves, Safety jackets, helmets, respirators etc. (viii) Cleaning chemicals, reagents and lubricants etc. (xi) Contractor shall ensure the filter media particles are upto the level in ACF and PSF, if the quantity level reduces due to loss during filtration and back wash, the same should be top up during routine maintenance.

(g) The following tests shall be carried out and maintain the record of treated sewage as per frequency mentioned below :- Ser no Description of Parameters Periodicity (i) Ph Weekly (ii) TSS Weekly (iii) Residual chlorine Weekly (iv) Dissolved Oxygen Weekly

Taking down existing monoblock / non‑clog self‑priming / centrifugal pump motor of following capacity by disconnecting all electrical and mechanical connections; dismantling pump and motor assembly; cleaning, inspecting, and replacing unserviceable gaskets, fasteners, and consumables; lubricating bearings; reassembling, aligning, reconnecting suction and delivery pipelines; making electrical connections; testing and commissioning to ensure smooth operation, complete all as specified and directed. Note: Replacement of any major items will be measured and paid for separately.

a) upto 2 HP

Supply only in repairs deep groove ball bearings for drive-end and non-drive-end of monoblock / non‑clog self‑priming / centrifugal pump motor of following capacity, complete all as specified and directed.

a) upto 2 HP

Supply only in repairs dynamically balanced bronze/stainless-steel impeller suitable for centrifugal pump of following capacity, complete all as specified and directed.

a) upto 2 HP

Material and labour for rewinding of monoblock / non‑clog self‑priming / centrifugal pump motor of following capacity, including removal of burnt‑out winding, cleaning stator slots, providing new super‑enamelled copper winding wire of suitable gauge, inserting insulation materials, varnishing with Class F/H insulating varnish, oven baking, assembling motor with new gaskets and fasteners, testing insulation resistance and performance, reconnecting and commissioning, complete all as specified and directed.

a) upto 2 HP

M & L for painting of existing pumpsets, motors and panels including primer and two coats of synthetic enamel paint, complete all as specified.

M & L for replacement of existing air diffusers in aeration tank including removal and fixing of new diffusers, complete all as directed.

M & L for repair / servicing of existing hypochlorite dosing pump including calibration and testing, complete all as specified.

M & L for repair / servicing of existing primary clarifier rake arm gearbox, complete all as directed.

M & L for repair / servicing of existing secondary clarifier rake arm gearbox, complete all as specified.

M & L for repair / servicing of existing filter press hydraulic system – STP-A including oil and seal replacement, testing and commissioning, complete all as specified.

M & L for repair / servicing of existing filter press hydraulic system – STP-B including oil and seal replacement, testing and commissioning, complete all as specified.

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