Welcome . Introduction to Environmental Engineering. Code No. (PE389) . Lec . 6. Dr.Khaled ali. Wastewater Treatment. Wastewater Treatment. WASTEWATER CHARACTERISTICS. Discharges into a sanitary sewerage system consist of domestic wastewater (sewage), industrial discharge .
Introduction to Environmental Engineering
Code No. (PE389)
Discharges into a sanitary sewerage system consist of domestic wastewater (sewage), industrial discharge.
Industrial discharges vary widely with the size and type of industry and the amount of treatment applied before discharge into sewers.
The following basic criteria should be satisfied in the design and operation of any wastewater disposal system:
1. prevention of microbiological, chemical, and physical pollution of water supplies and contamination of fish and shellfish intended for human consumption;
2. prevention of pollution of bathing and recreational (activity) areas;
3. prevention of unpleasant odors;
4. prevention of human wastes and toxic chemicals from coming into contact with humans, animals, wildlife, and food chain crops or being exposed on the ground surface accessible to children and pets; and
5. strict adherence to standards for groundwater and surface-water protection and compliance with federal, state, and local regulations governing wastewater disposal and water pollution control.
For any given wastewater in a specific location, the degree and type of treatment are variables that require engineering decisions.
Often the degree of treatment depends on the capacity of the receiving water. DO sag curves can indicate how much BOD must be removed from wastewater so that the DO of the receiving water is not depressed too far.
The amount of BOD that must be removed is an effluent standard and dictates in large part the type of wastewater treatment required.
The effluent from this wastewater treatment must meet the following effluent standard:
1. Primary treatment
2. Secondary treatment
3. Tertiary treatment
The settling tank that immediately follows screening and grit removal is called the primary clarifier.
The solids that drop to the bottom of a primary clarifier are removed as primary sludge.
Primary sludge generally has a powerfully unpleasant odor, is full of pathogenic organisms, and is wet,
After primary treatment the wastewater may move on to secondary treatment.
Mention three important parameters should be recognized in order to caterorize wastewater.
Draw a simplified flow diagram for primary treatment stages
Explain all the processes involved within the primary treatment
TYPES AND SOURCES OF GASEOUS AIR POLLUTANTS
nongaseous air pollutants
GLOBAL AND ATMOSPHERIC CLIMATE CHANGE