Table of Contents
What makes up activated sludge?
Activated sludge consisting of suspended flocs of active bacteria is mixed with the wastewater. The organic pollutants are used for growth by bacteria and thereby transformed to water, CO2 and new cell material.
What is the composition of sludge in the wastewater?
As shown in Table 1，plant sludge contains large amounts of organic matter and N, P, K and other nutrients. In dry sludge, there contains 13.8\%-17.9\% organic matter, 16g/kg-31.8g/kg TN,6.8g/kg-13.1g/kg TP and 2.2 g / kg -3.1 g / kg total TK, with an average content of 15.65\% , 23.76 g/kg,9.9g/kg,2.58 g/kg respectively.
What are all three sources of wastewater?
There are three types of wastewater, or sewage: domestic sewage, industrial sewage, and storm sewage.
What is complete mix activated sludge?
Complete mixing activated sludge systems are those activated sludge systems where the incoming wastes are uniformly mixed with the activated sludge to maintain all suspended solids in suspension with a uniform oxygen uptake rate throughout the entire aeration tank and a mini- mum dissolved oxygen concentration of 0.5 …
What is the composition of sewage?
Chemically, the sewage consists of approximately 99\% water and 1\% inorganic and organic matter in suspended and soluble forms.
What is CMAS in wastewater treatment?
A very important characteristica of the BNR plant is the flow pattern in the various reactors, which may vary between plug flow (PF) and completely mixed activated sludge (CMAS) reactors.
What are the two components present in activated sludge systems?
7. An activated sludge system consists of two components, an aerator and ________ Explanation: Aerator and clarifier are the two components present in activated sludge systems. An activated sludge system consists of two components such as aerator and clarifier.
What is the concentration of mixed liquor in activated sludge?
Typically, dry solids concentrations of mixed liquor (MLSS) range from 3 to 6 g/L. With all activated sludge plants, the concentration of biodegradable components present in the influent is reduced due to biological (and sometimes chemical) processes in the aeration tank.
Why is pre-treated sludge treated in an activated sludge reactor?
Explanation: Pre-treated sludge is treated in an activated sludge reactor. This helps to reduce a load of treatment on the activated sludge process. 3. After the treatment, the BOD demand ______
What is the physical mechanism for mixing of sewage and sludge?
The rising oxygen and injected return sludgeprovide the physical mechanism for mixing of the sewage and sludge. Mixed sludge and sewage is decanted at the surface and separated into supernatant and sludgecomponents.