What is the ideal temperature of waste water in bio-reactor?
A membrane bioreactor (MBR) is a system that combines membrane processes. The activated sludge process, a biological wastewater treatment method, is combined with the ultrafiltration (UF) or microfiltration (MF) process. The MBR sewage treatment process is primarily used to treat industrial and municipal wastewater.
A Bioreactor system is made up of 10-11 subsystems, as well as membrane zone and fine screening result also shows. The membranes' primary function is to separate organic matter from water. This is typically accomplished using clarifiers and filters found in activated sludge facilities. The first step in weakening contaminants is the membrane zone. These contaminants are then filtered using a series of membrane elements.
Benefits of waste water treatment
· It produces high quality effluent.
· Easy Retrofit
· It is an upgrade of old waste water treatment plants.
· Sludge removal cost is low.
· Very easy to operate.
Waste water treatment in bioreactor
Operators are aware that if the temperature of the wastewater entering the bioreactor is too high, the microorganisms in the activated sludge system will suffer. The wastewater entering a biological reactor should have a maximum temperature of 95°F (35°C). It should be noted that many wastewater treatment systems are unable to keep their wastewater at or below this temperature. Nonetheless, the literature appears to be consistent in establishing 95°F as the maximum limit, beyond which the biological system and solids settling in the clarifiers will start to suffer.
Bacteria temperature ranges
Bacteria are classified into one of four temperature ranges or classifications:
4) Hyperthermophillic or extreme thermophilic
The mesophilic temperature range is agreed upon for microorganisms in aerobic biological wastewater treatment systems. The disagreement over the actual temperature ranges that define each classification surprised me.
Fortunately, the upper temperature limit that establishes the boundary for optimal conditions in a biological wastewater treatment system is widely accepted. This limit is reached at 95°F (35°C). The experience evaluating and auditing wastewater systems serving "warm" industries like refinery, chemical, steel, and paper, as well as municipal plants in warmer regions, the upper limit for optimal treatment conditions is closer to 90°F (32.2°C).
Temperature fluctuations throughout the year can have a significant impact on the composition of microbial communities. As with pH, each species has a minimum, optimum, and maximum temperature that will support growth.
Psychrophiles grow best at temperatures ranging from 0 to 20°C (32 to 70°F), with an optimum of 10 to 15°C (50 to 60°F).
Mesophiles, which comprise the majority of the species commonly found in wastewater treatment processes, grow at temperatures ranging from 10 to 45°C (50 to 115°F), with an optimum temperature of around 30 to 35°C (85 to 95°F).
Thermophiles, which can be found in compost piles and other high-temperature environments, grow at temperatures ranging from 40 to 75°C (105 to 165°F), with an optimum growth rate at 55 to 65°C (130 to 150°F).
Extreme thermophiles are heterotrophic bacteria that can grow at temperatures above 100°C (212°F). These organisms are found in highly specialised environments, such as geothermal vents on the ocean floor, and have not been linked to wastewater treatment processes.
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