what is the anaerobic wastewater treatment?

Answer 1

ANAEROBIC BASICS
Anaerobic treatment converts the organic pollutants (COD, BOD) in wastewater into a small amount of sludge and a large amount of biogas (= methane gas + carbon dioxide), while leaving some pollution unremoved. In contrast, aerobic processes produce a lot of excess sludge, and no biogas, while also leaving some pollution, though less than after anaerobic treatment, unremoved. The main advantages of anaerobic treatment, particularly for bigger plants, are:
1. Low operating costs
2. Low space requirements
3. Valuable biogas production
4. Low sludge production

Aerobic processes use bacteria that need oxygen to live, anaerobic bacteria do not. In the absence of oxygen, many different groups of anaerobic bacteria "work" together to degrade complex organic pollutants into methane and carbon dioxide (biogas). The microbiology is more complex and delicate than in case of aerobic processes, were most bacteria "work" individually.
The biological degradation of complex organic compounds takes place in several consecutive biochemical steps (chain reaction), each performed by different groups of specialized bacteria. In practice, the acetogenic (acetate building) and methanogenic phases are most often the rate limiting steps. On the other hand, the generation of methane gas can only happen as fast as methane bacteria receive their substrates. Methane bacteria only use acetic acid, hydrogen gas (H2) and carbon dioxide (CO2), or methanol as a substrate.

Answer 2

Anaerobic treatment is a process in which microorganisms convert organic matter into biogas in the absence of oxygen. Anaerobic treatment is an energy-efficient process that is typically utilized to treat high-strength industrial wastewaters that are warm and contain high concentrations of biodegradable organic matter (measured as BOD, COD, and/or TSS). An anaerobic system can be used for pretreatment prior to discharging to a municipal wastewater treatment plant or before polishing in an aerobic process.

Answer 3

anearobic wastewater treatment is as already stated the treatment of wastewaters in the presence of zero oxygen, indeed oxygen is a poison to the bacteria that digest the dissolved waste in the water. the process goes on in huge sealed digestors that have been initiated with a sludge seed. A very useful by product of this process is methane. The digestion of solubles in the wastewater of an average sized papermill effluent stream can develop enough methane to save 250k powering the boilers. Tropical fish also benefit greatly from the anaerobic digestion of their waste though they havent quite found as good a use for the methane yet.

Answer 4

anaerobic means without air

anaerobic water treatment methods utilize bacteria that can live in a low oxygen environment

these bacteria can breakdown many organic wastes

many water treatment systems have an aerated section where aerobic bacteria do their thing, and also an anaerobic section

this provides for more complete treatment in some wastewater systems

there are also treatment ponds sometimes called "facultative"
these often have aerated surface waters aerobic bacteria flourishing and anaerobic conditions at the bottom of the pond where anaerobic bacteria flourish

Answer 5

Anaerobic means that it works without oxygen.

For wastewater treatment, it refers to types of bacteria that breakdown organic waste in an environment without oxygen.

This process is also comparable to what is done naturally in swamps, bogs, and other types of wetlands where similar bacteria prosper naturally.

Answer 6

two good answers here. Though I would add that anaerobic digestion also leads to the formation of Hydrogen Sulphide. It can be very difficult to abate this nasty odour, therefore, aerobic treatment is preferred in populated areas - to cut down on nasty smells

Answer 7

anaerobic is a type of bacteria used in waste water treatment plants to help "eat" or digest the unsanitary solids

Answer 8

wdmc got this one right.