What are the 3 stages of wastewater treatment PDF?
Wastewater is treated in 3 phases: primary (solid removal), secondary (bacterial decomposition), and tertiary (extra filtration).
What are the main steps of treatment of municipal wastewater?
The Wastewater Treatment Process
- Stage One — Bar Screening.
- Stage Two — Screening.
- Stage Three — Primary Clarifier.
- Stage Four — Aeration.
- Stage Five — Secondary Clarifier.
- Stage Six — Chlorination (Disinfection)
- Stage Seven — Water Analysis & Testing.
- Stage Eight — Effluent Disposal.
Which of the following are the main goals of municipal wastewater treatment?
prevent the pass-through of toxic pollutants into surface waters receiving discharges of treated wastewater effluent; and. enhance opportunities to recycle treated municipal wastewater and sludge (EPA, 1993b)
What is bod a measure of?
Biochemical oxygen demand, or BOD, is a chemical procedure for determining the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period.
What is aeration in wastewater treatment?
Aeration is the process of adding air into wastewater to allow aerobic biodegradation of the organic materials. This is where the sewage gets pumped into an aeration tank, where it is mixed with air and sludge loaded with bacteria.
What is conventional wastewater treatment?
Conventional wastewater treatment consists of a combination of physical, chemical, and biological processes and operations to remove solids, organic matter and, sometimes, nutrients from wastewater.
What is BOD to COD ratio?
BOD is oxygen demand for oxidation of organic matter by micro organism. COD is oxygen demand for oxidation of organic and non biodegradable organic matter. COD is always greater than BOD hence the ratio will be always greater than 1. If BOD/COD is 0.92 to 1, waste water is fully biodegradable.
