CHOLA AQUA TECHNOLOGIES & SERVICESNEW #34, 2ND FLOOR, ST.MARY’S ROAD, MANDAVELI, CHENNAI – 600 028.

PHONE: 044-2461 0789 / +9194443 03293

ABOUT 40 KLD SEWAGE TREATMENT PLANTREPAIR AND RENOVATION PROGRAMME @

THE STANDARD CHARTERED BANK, NUNGAMBAKKAM, CHENNAI.

DATE: 05.08.2013

OBJECTIVEPurpose of this report is, justifying our proposal about existing sewage plant overhauling, repair and renovation.

AIM

The ultimate goal of this work is Renovate the STP and also establish a system for reuse the treated water. Ensure the legal compliance of TNPCB Ensure cost effective solution, easy to operate and reduce the O & M Cost..

EFFLUENT CHARACTERISTICS

BACKGROUND

The Standard Chartered Bank, located at Nungambakkam, produced per day maximum 40KLD domestic waste water from their domestic activity. Presently they have own system, that was not suitable for achieve the compliance of TNPCB and their reclamation water requirement.

OBSERVATION

The time of our site visit, we are found and observe the following matters.EXISTING PLANT LAYOUT

S.No. Description of the Parameter Raw Effluent Treated Effluent Characteristics (After Renovation)

1. pH 6.5 – 8.5 6.5 – 8.5

2. BOD (Biological Oxygen Demand) 450mg/lit <30mg/lit

3. COD (Chemical Oxygen Demand) 500mg/lit <250mg/lit

4. TSS (Total Suspended Solids) 300mg/lit <10mg/lit

5. Oil & Grease 50mg/lit <10mg/lit

PARAMETERS PRESENT CONDITION ACTUALLY REQUIRED

CAPACITY 40 KLD to 60 KLD 40 KLD

Treatment Type Cacoo Filter method Cacoo filter method

Collection cum Equalisation Tank

Collection tank Available, Tank capacity data not available

As per standard procedure minimum 2X of daily flow

Biological Activity Not adequate Must in Collection tank & Cacoo filter

Primary Filter Available Primary Filter available, but not adequate in performance

Cacoo Filter Available -

Air blower Available, but not adequate airflow (Time of observation) Minimum 50m3/hr @0.4kg/cm2 pressure

Air Distribution System In fully damaged condition (Time of observation)

Cacoo Filter Media support In damaged condition -

Air Distribution System (Air Diffusers)

Not working, fully damaged condition It is must for sewage treatment

Cacoo media (graded pebbles & sylex)

Not in adequate quantity, fully chocked condition Minimum 1 to 1.25m height maintained

Cacoo media – Carbon Not in adequate quantity Minimum 300 liters Carbon maintained

Cacoo media – Anthra cite Not in adequate quantity Minimum 300 liters maintained

Recirculation mechanism Not available / damaged condition Recirculation mechanism should be provide with 1HP pump with adequate plumbing

OBSERVATION

OBSERVATION CONTINUE…REASONS:Strong strength sewage inflow with FOG. There is no control provision in existing system.Biological activity is disturbed, due to fat & oil. It is affected and damaged the Cacoo system.Aeration: - Blowers are not in working conditions. Present air distribution is not working.High inflow of BOD affect the Cacoo filter efficiency, lackness of recirculation system in the existing system.RECOMMENDATIONS: Improve the Aeration Efficiency – Replace the existing blower and installed Aeration recirculation pump and sufficient diffusers for

nutrient removal (BOD). Biological activity should be developed – inoculate beneficial bacteria. Provide sufficient media in Cacoo system.PROPOSED REPAIR & RENEVATION STRATEGY:The proposed STP renovation program is designed for utilizing maximum available facility and improve the treatment quality of the waste water (capacity of 40 KLD) through the installation of new blower, recirculation system with pump, Cacoo media replacement & installed the air distribution system with support and accessories.

REPAIR & RENOVATION ACTIVITY ABSTRACT

CONCLUSION: The proposed scheme is help to produce the reclamation water(for Gardening) and conforming to the standards stipulated by

Tamil Nadu Pollution Control Board. Ensure cost effectiveness, easy to operate and reduce the O& M Cost.

DESCRIPTION Recommendations IMPLEMENTATION ACTIVITY

Improvement of Aeration System Install the new Air Blower & Air Distribution System with Cacoo media support

YES

Cacoo filter efficiency improvement Provide new suitable media with carbon & Andhra cite YES

Primary Filtration System Provide new media & multiport valve / repair YES

Cacoo Filter Recirculation System Provide recirculation system along with 1HP sewage pump with adequate piping system

YES

Biological Activity Improvement Inoculate beneficial bacteria , oil and fat digesting bacteria

YES