Waste Water Exam 3

Principal sources of wastewater

Residential/Domestic

Industrial

Commercial

Institutional

Inflow/Infiltration

Peak hourly flow

Highest sustained hourly flow

Inflow

Unpolluted water

Infiltration

Ground Water Seepage through defects

Fecal Coliforms

Specific to Ecoli

Indicator Organisms

Organisms that show the presence of a pathogen

Pathogens

Disease causing organisms

BOD

Biochemical oxygen demand

TOC

Total Organic Carbon

COD

Chemical oxygen demand

NPDEs

National Pollution Discharge Elimination System

A permitting system created under the CWA to control pollution going into surface waters.

SWD

Surface Water Discharge

Part of CWA and control how pollutants enter bodies of water.

CWA

Regulates water pollution and protects bodies of water.

TMDL

Total Maximum Daily Load

The max amount of a pollutant that a body of water can receive in one day and still meet quality standards

Secondary 30d avg/7d avg/30d % removal

BOD5 - 30/45/85%

CBOD - 25/40/85%

TSS - 30/45/85%

pH 6<pH<9

Reasons for Grit Removal

Prevent wear on pumps

Accumulations in aeration tanks

Clogging of sludge piping

Type I settling

Discrete, particles are independent, uses stokes law

Example - Sand particles settling in grit chamber

Type II Settling

Particles flocculate, large particles settle faster, primary sedimentation

Example - Primary settling of wastewaters

Type III Settling

High SS, zone or hindered settling

Example - Settling that occurs at intermediate depths

Type IV Settling

High SS and compression settling where secondary clarifiers thicken

Example - Compression settling that occurs in lower depths of a final clarifier.

Types of organisms in a WWTP

Fungi

Algae

Protazoa

Bacteria