IC --- Internal Circulation Anaerobic Reactor
Anaerobic microorganism treatment is an indispensable treatment section in the current high concentration organic wastewater sewage water treatment process. It is better that aerobic microorganism treatment not only has low energy consumption, but also can produce biogas as a secondary use of energy. The higher the anaerobic reaction volume load is, the higher the oxygen reaction is, and the lower the investment is for treating the same amount of COD anaerobic reaction.
At present, the commonly used anaerobic treatment processes include:
UASB --- Up-flow Anaerobic Sludge Bed/Blanket
EGSB --- Expanded Granular Sludge Blanket Reactor
CSTR --- Continuous Stirred Tank Reactor
IC --- Internal Circulation Anaerobic Reactor
ABR --- Anaerobic Baffled Reactor
UBF --- Upflow Sludge Bed Filter
AF --- Anaerobic Biofilter
AFBR --- Anaerobic Fluidized Bed Reactor
USSB --- Upflow Staged Sludge Bed
AAFEB --- Anaerobic Attached microbial Film Expanded Bed
USR --- Upflow solid anaerobic reactor
PPR --- Plug Flow Reactor
Two-phase Anaerobic Reactor
IC --- Internal Circulation Anaerobic Reactor
IC (Internal Circulation) Reactor, namely Internal Circulation Anaerobic Reactor, is used for organic high concentration wastewater, such as corn starch wastewater, citric acid wastewater, beer wastewater, potato processing wastewater and alcohol wastewater.
At present, the IC Reactor is widely used in the papermaking industry by papermaking enterprises that use various kinds of waste paper as raw materials. The purpose of treatment includes achieving the general standard discharge, and achieving the dual purpose of water saving and pollution control by reusing the treated wastewater.
Concept of IC Reactor
IC (Internal Circulation) Reactor is a new generation of highly efficient anaerobic reactor, namely Internal Circulation Anaerobic Reactor, which is similar to a two layer UASB reactor in series. It consists of upper and lower reaction chambers. Wastewater flows from bottom to top in the reactor, pollutants are adsorbed and degraded by bacteria, and purified water flows out from the upper part of the reactor.
Working Principle of IC Reactor
It is composed of two UASB reactors in series. According to the function, the reactor is divided into five zones from bottom to top: Mixing Zone, The First Snaerobic Zone, The Second Anaerobic Zone, Sedimentation Zone and Gas-liquid Separation Zone.
1.Mixing Zone: The influent at the bottom of the reactor, granular sludge and the sludge water mixture returned from the gas-liquid separation zone are effectively mixed in this zone.
2.The First Anaerobic Zone: The sludge water mixture formed in the mixing zone enters this zone, and most of the organics are converted into biogas under the action of high concentration sludge. The rising flow of mixed liquor and the violent disturbance of biogas make the sludge in the reaction area swell and fluidize, and strengthen the contact between the sludge and water surface, thus keeping the sludge highly active. With the increase of biogas production, part of the slurry mixture is lifted to the gas-liquid separation area at the top by biogas.
3.The Second Anaerobic Zone: The wastewater treated in the first anaerobic zone will enter the second anaerobic zone through the three-phase separator, except that part of the wastewater will be lifted by biogas. The sludge concentration in this area is low, and most organic matters in the wastewater have been degraded in the first anaerobic zone, so the biogas production is small. The biogas is introduced into the gas-liquid separation area through the biogas pipe, which has little disturbance to the second anaerobic area, providing favorable conditions for sludge retention.
4.Sedimentation Zone: The sludge water mixture in the second anaerobic area is solid-liquid separated in the sedimentation area, the supernatant is discharged by the outlet pipe, and the precipitated granular sludge returns to the sludge bed in the second anaerobic area.
5.Gas Liquid Separation Zone: The biogas in the lifted mixture is separated from the mud water and led out of the treatment system here. The mud water mixture returns to the mixing area at the bottom along the return pipe, and is fully mixed with the sludge and water at the bottom of the reactor, realizing the internal circulation of the mixed liquid.
It can be seen from the working principle of the IC reactor that the reactor realizes SRT> through a two-layer three-phase separator; HRT to obtain high sludge concentration; Through a large amount of biogas and the violent disturbance of internal circulation, the muddy water is fully contacted, and good mass transfer effect is obtained.
The IC tower uses the biogas generated by the first UASB reactor below as the internal power for lifting, which is a density difference between the mixed liquid of the riser and the return pipe, realizing the internal circulation of the mixed liquid at the lower part, so as to enhance the pretreatment of wastewater. The second UASB above conducts post-treatment (or precision treatment) of wastewater to make the effluent meet the expected treatment requirements. It is composed of the sludge area at the bottom and the gas, liquid and solid three-phase separation area at the middle and upper parts. Through the reflux and structural design, the wastewater has a high rising flow rate in the reaction area, and the granular sludge in the reactor is in the expansion state of the anaerobic reactor.
IC anaerobic reactor is an efficient multi-stage internal circulation reactor, which is the representative type of the third generation anaerobic reactor (UASB is the representative type of the second generation anaerobic reactor). Compared with the second generation anaerobic reactor, it has less land occupation, high organic load, stronger impact resistance, more stable performance, and simpler operation and management.
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