Packaged Stp Ppt 162z3o

OPTIMA ENGINEERS & DEVELOPERS

PACKAGED SEWAGE TREATMENT PLANT

INTRODUCTION

• We undertake detailed engineering works for design, manufacture, supply, erection, testing and commissioning of water and wastewater Treatment Plants and Projects of Water Distribution as well as Waste Water Collection and Storm Water Disposal Systems. ▫ Our Environmental consultancy includes the following services, ▫ Treatability and Feasibility studies related to Sewage and Effluent treatment plants. ▫ Modifications and up-gradations in existing ETP/STP. ▫ Basic and detailed engineering for setting of new STP/ETP including tender documentation. ▫ Design of sewage/effluent collection and conveyance system ▫ Provision of packaged sewage treatment plants. ▫ Rainwater harvesting systems. ▫ Turnkey execution of RCC/MS sewage treatment plant with zero discharge concepts. ▫ Environmental clearance services for building projects.

CONVENTIONAL FLOW CHART FOR PACKAGED STP BASED ON ‘ASP’ TECHNOLOGY

PACKAGED SEWAGE TREATMENT PLANT BASED ON ACTIVATED SLUDGE PROCESS

• The Extended Aeration Process, a modification of the Activated Sludge Process, effectively treats the contaminants in wastewaters. The standard basis of design includes an aeration system, providing a 24-hour detention time and a final settling tank, with an effective 4-hour detention time. • Diffused air is introduced into the aeration tank. This provides the proper environment for the development of aerobic bacteria. These bacteria thrive on the materials contained in the wastewater. The prolonged period of aeration, in addition, oxidizes a portion of the solids in the system. Oxygenation by diffused aeration provides operating flexibility and standby reserve to meet the demanding requirements of the varied package plant applications.

• Separation of the solids from the mixed liquor developed in the aeration tank takes place in the settling compartment. The clarified effluent is withdrawn for reuse or discharged into a receiving stream from the top of the settling tank. The settled solids are rapidly pumped from the bottom of the settling tank back to the aeration system. These Extended Aeration Plants are proven workhorses, providing excellent Biochemical Oxygen Demand (BOD) and Total Suspended Solids (TSS) removal efficiencies. Only minimal routine housekeeping and operational tasks are required of the plant operator.

PACKAGED SEWAGE TREATMENT PLANT

Key Features

Sample Applications

• Economy • Ease of Installation • Simplicity of Operation & Proven Reliability • Fulfils Regulatory Requirements

• • • • • • •

Small Communities Schools Hotels and Resorts Housing Developments Hospitals Shopping Malls Industrial Parks & Factories

BASIC DESIGN PARAMETERS OF PACKAGED STP BASED ON ‘ASP’

• Since this unit is an extended aeration system, its (BOD5/MLSS) F/M loading is in the range of 0.042 to 0.153. This F/M ratio establishes the MLSS concentration in the range of 2500 to approximately 6000 mg/L. • Aeration compartment volume has been established to provide a detention period of 24 hours at design flow. • The clarifiers are designed to produce solids separation under all hydraulic loading conditions. • Air is supplied to the diffs by positive displacement blowers. These blowers are designed to provide sufficient air to ensure that the dissolved oxygen content of the aeration chambers can always be maintained within the range of 1.0 to 2.0 mg/L.

• • • • • • • • • • •

BASIC UNITS OF PACKAGED STP

Screen (optional) Oil & grease removal tank (optional) Equalization tank Primary settling tank (optional) Aeration tank Secondary clarifier Disinfection tank Pressure sand filters Activated carbon filters Treated water tank Sludge drying beds or filter press for sludge disposal

SCREEN 1. 2. 3. 4. 5. 6. 7.

Inlet Pipe Debris Muck Grill Screened Sewage Outlet Pipe Platform With Weep Holes

OIL & GREASE TANK 1.

2. 3. 4. 5. 6. 7.

T t (Avoiding the Disturbance by Falling Water) Level Till Which the Tank is Filled Fat and Scum Grit and Solids Baffle Plate Wastewater (Free from Oil) Outlet

EQUALIZATION TANK

1. Inlet Pipe 2. Sewage 3. Raw Sewage Lift Pumps (1w + 1s) 4. Delivery Pipe 5. Course Bubble Diffs 6. Air Supply Pipe Lines

PRIMARY & SECONDARY SETTLING TANKS

1. Inlet Pipe 2. Center feed well 3. Steeply sloped walls of the tank 4. Bacterial flocs 5. Sludge pipe 6. Sludge Pumps (1w + 1s) 7. Header Assembly 8. Clear water 9. Launders 10. Clarified water pipe

AERATION TANK

1. Inlet Pipe 2. Baffle Wall 3. Sewage Level (Which is Set by Top of the Launder 4. Outlet Launder 5. Net (Prevents the Entry of Debris) 6. Outlet Pipe 7. Fine Bubble Diffs 8. Header Pipe (Air Supply) 9. Sludge Recirculation Pipe

CHLORINE DOSAGE TANK

• Chlorine is Dosed in A Controlled Manner for the Disinfection of Treated Water • Separate Dosing Tank (HDPE) is Provided for the Chlorine Solution • Disinfected Effluent is ed Through PSF And ACF by Means of Pressure Pumps

PRESSURE SAND FILTERS

• The Filter vessel is designed as a pressure vessel (it consists of a straight cylindrical shell, with convex dishshaped ends welded to the top and bottom). A typical vessel is designed to withstand a pressure of 5 kg/cm2. • A set of pipes, valves, by line, backwash waste line etc. are also provided to facilitate operations such as filtration, by (during servicing), backwash etc. Pressure gauges are provided at the inlet and outlet, to monitor the pressure drop across the filter.

ACTIVATED CARBON FILTERS

• Activated carbon is typically manufactured from coconut shell or charcoal, the “activation” process creating a highly porous material with a very large surface area. Organic pollutant molecules are physically adsorbed and held fast within the catacomb-like porous structure of the activated carbon. Granular activated carbon is typically used for this purpose.

SLUDGE DRYING BEDS OR FILTER PRESS

• Quantity of sludge will be considered as ……….. For extended aeration technology. • Sludge drying beds are the cheapest and easiest way to dispose off the extra sludge. • Generally sludge drying beds are provided in multiple of two. • Filter press 1. Filter plates 2. End plate 3. Rails 4. Hydraulic jack 5. Plunger 6. Inlet pipe 7. Filtrate discharge pipe 8. Frame

PARAMETERS OF RAW SEWAGE AND EXPECTED PARAMETERS AFTER TREATMENT

Raw parameters of Sewage & Grey water Sr. No.

Parameters

1

pH

Inlet Characteristics (Values in mg/lit except pH) 6.0 – 8.0

2

COD

3

Expected parameters of wastewater after treatment Sr. No.

Parameters

1

pH

Outlet Characteristics (Values in mg/lit except pH) 6.5 – 8.5

350 - 450

2

COD

<100

BOD

250 - 350

3

BOD

<30

4

SS

150 - 250

4

SS

<10

5

Oil & Grease

10 - 20

5

Oil & Grease

<10

* Range mentioned for treated parameters are accepted by ‘MOEF’ for Gardening and flushing purpose.

TREATMENT SCHEME FOR PACKAGED ‘STP’

BLOCK DIAGRAM

Capital Cost

COSTING

• Cost will depend on following factors ▫ Make  RCC  MS  SS

▫ ▫ ▫ ▫ ▫ ▫

FRP coating Epoxy paint Automation Transportation Scope of work Degree of treatment

• Generally Rs. 30 to 40 per liter will be the installation cost for plants having capacity up to 100 KLD • Capital cost decreases if the capacity of plant increases

Running Cost

• Major cost of operation will be considered as electrical and power expenses • Running cost will depend on the capacity of Mechanical equipments • Maintenance cost is not even 2 % of capital cost per year.

SPACE REQUIREMENT

• Packaged sewage treatment plants are compact and based on the extended aeration system. • RCC plants can be flushed with the finished ground level by constructing under ground RCC tanks. • Approximately 1 Sq. Ft. is required for treating 1 Cum of sewage. • Sludge disposal space requirements will be reduced by providing filter press.

MAXIMUM AND MINIMUM CAPACITY

• Packaged Sewage treatment plants can be made up to capacity of 250 KLD in Mild Steel. • RCC sewage treatment plants can be made up to any capacity required. • In case of Mild steel plants (Pre-fabricated plants) transportation should be given due importance. • Practically minimum capacity of packaged sewage treatment plants should be 20 KLD.

MAJOR MECHANICAL, ELECTRICAL, PIPING & INSTRUMENTATION UNITS

Mechanical units Electrical units Piping units

Instrumentation units

Pumps

MCC

Pipes

Level Switches

Air Blowers

Cabling

Valves

Flow meters

Filters

Switches

Gates

UV filters

Fabricated water tanks

Elbows

Dosing pumps

Canopies

Bends

COMPUTERIZED MODEL

COMPLETED PROJECTS L & T, Baroda.

Agro Tech Foods, Jhagadia.

THANK YOU. (Queries are Invited if Any.)