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Design of a Wastewater Treatment Plant. By Danny Dehon Monique Magee Melissa Wason Shreya Purohit. Over view. Introduction Objective Criteria General flow chart Design Detailed flow chart Cost analysis References. Introduction. What is waste water?

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design of a wastewater treatment plant

Design of a Wastewater Treatment Plant

By

Danny Dehon

Monique Magee

Melissa Wason

Shreya Purohit

over view
Over view
  • Introduction
  • Objective
  • Criteria
  • General flow chart
  • Design
  • Detailed flow chart
  • Cost analysis
  • References
introduction

Introduction

What is waste water?

It is a combination of liquid wastes from industries, commercial and residential areas. It also includes storm water, ground water and surface runoff

Why do we need to treat waste water?

Why do we need to treat waste water?

objective
OBJECTIVE
  • To design a waste water treatment plant for a town of 10,000 people, which treats 1 million gallons of waste water per day.
  • The characteristics of the effluent water are in compliance with current regulatory standards.
general flowchart
GENERAL FLOWCHART

Pre-treatment

slide8
Main sewer linediameter=14 inchesflow 1MGD= 1.54 ft 3/svelocity 1.3ft/sQ=VAmade of stainless steel
pumping of water to bar screens
Pumping of water to bar screens
  • Water is pumped 70 ft
  • 880kw power needed
  • Vertical Turbine Solids-Handling Pumps VTSH® Series pump- specially designed to handle solids
  • Head:70 feet and this pump has a head of up to 110 ft
  • Pump Capacity:30,000 GPM
  • Impeller:non-clogging, blunt, and made of cast iron,
  • Shaft: stainless steel
calculation bernoulli s equation
CalculationBernoulli’s equation

Where h2= 70 ft, V2= .8ft/s, and V1= 1.1ft/s

bar screens
Bar screens
  • Removes sticks, glass, small rocks etc
  • Climber type bar screen
  • Spacing ¼ inches
  • Fine screening
  • Stainless steel to prevent corrosion
  • Mechanically scrapped
  • Solids collected in hopper and disposed
pre treatment calculations
Pre Treatment Calculations

Aerated grit removal chamber

Volume

Skimming tank

Volume

Tank dimensions

Volume = 4x3

primary sedimentation tanks
Primary Sedimentation Tanks

Retention time

  • 90 min

Water velocity

.665ft/s

Dimensions

  • width 15.8 ft
  • length 52.77 ft
  • Depth 10 ft.
calculations
Calculations
  • Water velocity
  • Dimensions
trickling filters
Trickling Filters

Tipping tray

Retention time: 5 minute

Dimensions: h=r =7.04ft

Filter

Dosing cycle : 5 min

Retention time: 25 min

Dimensions h=r=13.04ft

Drainage = 5o slope

ventilation

calculations17
Calculations.
  • Volume
  • R=h=x
secondary sedimentation tanks
Secondary Sedimentation Tanks

Retention Time:

  • 20 minutes

Water Velocity:

  • drop rest of solids out of suspension
  • 1/3 of the velocity in the pipes, or .44 ft/s.

Dimension:

  • Required R: H = 2: 1,
  • R: H =10.57 : 5.29 ft.

Skimmer:

  • fence with extremely small square holes, .5 inches by .5 inches
  • Catches waste

Scraper:

  • mechanically operated
  • 5 arms.
  • Scrape off material from the bottom
calculation
Calculation
  • Water velocity
  • Dimensions
  • R=2h
calculations21
Calculations
  • Retention time
  • = 68 minutes
de chlorination chamber
De –chlorination chamber
  • Remove residual chlorine using SO2- above standards .0058 lb/gal
  • The ratio of the reaction is 2.43 x 10-6 lb sulfur dioxide for every 2.20 x 10-6 lb of chlorine.
  • .017 lb/ gal chlorine – neutralized with .012/gal of SO2
calculations23
Calculations
  • Basic chemistry
  • X = 0.012
total cost
TOTAL COST

INITIAL

  • $236,100

DAILY

  • $4981.23
references
References
  • Al-Layla, M. A., Ahmad, S., & Middlebrooks, E. J. (1980). Handbook of Waste Water Collection and Treatment. (G. l. culp, Ed.) Garland STPM Press.
  • Droste, R. L. (1997). Theory and Practice of Water and Wastewater. Hoboken: John Wiley & Sons.
  • Jern, W. (2006). Industrial Waste Water Treatment. New York: World Publishing Company.
  • Metcalf, L., & Eddy, H. P. (1935). American Sewerage Practice. New York: McGraw-Hill Book Company.
  • Metcalf, L., & Eddy, H. P. (1930). Sewerage and Sewage Disposal: A Textbook. New York: McGraw-Hill Book Company.
  • Metcalf, L., & Eddy, H. P. (1972). Wastewater Engineering. New York: McGraw-Hill Book Company.
  • Noyes, R. (1994). Unit Operations in Environmental Engineering. New York: William Andrew Publishing/Noyes.
  • Sanks, R. L. (1998). Pumping Station. London: Butterworth Heinemann.
  • Note: Some of the pictures are not referenced because they were taken by the authors of these papers during a visit to the Baton Rouge Wastewater Treatment Facility.