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					      MODULAR UASB FOR ANAEROBIC TREATMENT OF
               SOLUBLE WASTEWATERS

Anaerobic treatment                                     the country and has to be imported. RRL has
                                                        developed start-up process know-how, to
Anaerobic treatment is established as the best          produce granular sludge from non-granular seed.
technology for the PRIMARY TREATMENT of
high-COD mainly soluble industrial effluents.
                                                        The Gas-solid-separator system
New anaerobic technology, with high-rate
anaerobic reactors extends the benefit of                          The heart of RRL UASB reactor
anaerobic treatment to low and medium strength          consists of a specially designed modular gas
effluents, substantially reducing the cost of           collection system made from corrossion-free FRP
treatment. In an anaerobic treatment reactor, a         and steel.. Designed on computer for optimum
variety of micro-organisms work together to             cost-performance, it is uniquely combines 3
convert organic pollutants into biogas. Biogas          FUNCTIONS:
contains 50 to 80% methane.                                       GAS COLLECTION
                                                                  SLUDGE RECYCLE
High-rate anaerobic reactors and                                  EFFLUENT COLLECTION
                                                                  INFLUENT DISTRIBUTION
the UASB concept
High-rate reactors enable efficient removal of          The reactor itself is RCC in modern rectangular
BOD in small hydraulic retention times. This is         space-saving design, or as circular low-cost
very important in reducing plant cost in the            design. The reactor may be constructed
treatment of low and medium strength effluents          underground where soil conditions permit
which are usually discharged in large quantity.         considerable cost-saving.
This is possible because the micro-organisms
that perform the reactions are retained in the          Technical specifications:
reactor for a longer period than the liquid effluent.              Area of coverage per module: 7.5 m 2
                                                                   Gas collection nozzle per module: one
The UASB reactor is an economical solution for                     Liquid collection system: Integral, 3
the treatment of industrial effluent which have                     individually adjustable weir plates
substantially dissolved pollutants. It combines                    Feed Liquid inlet system: Integral, gravity
modern high-rate treatment technology with                          flow system
                                                                   Materials of construction: FRP, PVC, steel
simplicity of design. In the UASB reactor, special                  (epoxy coated)
GAS-SOLID-LIQUID            SEPARATORS         are                 Weight: 455 kg
mounted which enable collection of biogas and                      Mounting: above reactor liquid sur face on
recycle of anaerobic biomass. The avoidance of                      RCC wall
internal packing in the reactor greatly reduces the                Maintenance: Individual module may be
cost of reactor construction.                                       removed by blinding gas collection and
                                                                    liquid outlet nozzles while reactor is
                                                                    operating
The UASB reactor works best when desirable                         Transportation and assembly: Stackable
micro-organisms are retained as highly active                       components (box, baffles, frame) for easy
and fast settling granules. Granular seed sludge                    transpor tation and fast assembly at site.
as it is known is required for start-up of such
reactors. Granular sludge is unavailable within

 REGIONAL RESEARCH LABORATORY, CSIR, THIRUVANANTHAPURAM 695 019
               RRL - UASB reactor                                       Fixed film reactor

    High-rate operation                                      High-rate operation
    Safe atmospheric-pressure design                         -Reactor vessel pressurised
    Low power consumption                                    High circulation rate- high power
                                                                 consumption
    No internal structures, no clogging             -        Packing gets clogged on prolonged
                                                                 operation
    RCC construction for protection from                     -Steel reactor requires regular corrosion
       corrosion                                                  proofing, cannot prevent internal
                                                                  corrosion
    Space-saving rectangular design reactor                  -Circular reactor occupies more space
        integrated with auxiliary facilities such
        as sumps, pump rooms, control room
        and laboratory. Common wall
        construction for multiple reactors in
        large ETP.
    Option of elegant and cost-saving semi-                  Above ground design only
        underground structure for reactor where
        soil condition is favourable.
    FRP/PVC gas-liquid-solid separators                      All steel components
        corrosion proof
    Modular GAS-LIQUID-SOLID SEPARATOR.                      Modular designs not available. Internal
       Repairs may be carried out without shut-                 repair only after shutdown
       down.
    Self-cleaning inlet manifold design                      -No self cleaning system
    Open-design for access to inlet and outlets              Closed design

    Complete accessibility walkways -                        -Flow distribution cannot be monitored
    Individually aligned stainless steel notch
        plates for perfect flow distribution.
    Full 3-D Computer design; FEM design of
        gas solid separator.
    - Skilled operator requiref                              Stable at lower operator skill


Estimated cost per module: Rs.40,000. This              For more info rmation, contact:
includes feed distributor. Gas and liquid headers       Ajit Haridas, Scientist – Environmental
required are equal to one length of reactor only.       Technology, Regional Research Laboratory,
RRL provides basic and detailed engineering             CSIR, Thiruvananthapuram 695019,
package (except RCC structural design)                  Fax: 0471-2491712 Phone: 0471-2490674, e-
                                                        mail: tvm_ajithari@sancharnet.in




 REGIONAL RESEARCH LABORATORY, CSIR, THIRUVANANTHAPURAM 695 019

				
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posted:4/9/2011
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