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Extra resources for Degradation of Whey in an anaerobic fixed bed (AnFB) Reactor

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A higher OLR tended to lower the specific methane production. -1 Methane Production (ld ) 35 30 25 20 15 10 5 0 0 5 10 15 HRT (days) Figure 14 Methane production at different HRT. 35 l CH4 per g COD removed. The specific methane production, which was close to the theoretical yield of methane per 1 g of COD that was degraded was reached at an OLR lower than 10 g COD·l-1·d-1. Increasing the organic loading up to 35 g COD·l-1·d-1 reduced the specific methane production to les then 40% of the theoretically expected amount.

The residual non-degraded fatty acids in the effluent of the methane reactor contribute significantly to the remaining COD in the reactor effluent. Figure 11 shows the relationship between concentration of fatty acids and remaining COD in the effluent. Higher concentrations of acetate and propionate in the effluent corresponded with higher COD values in the effluent. Chap. 3 Results 45 150 Conc. Fatty Acid (mM) Acetate (mM) Propionate (mM) 100 50 0 0 5 10 15 20 25 30 -1 COD effluent (gl ) Figure 11 Residual volatile fatty acids concentrations at different COD in the effluent of the whey reactor.

Anaerobic contact reactors are used to remove soluble organic matter under anaerobic condition by sludge recycling to increase the 28 Chap. 1 Introduction active biomass concentration in the reactor. These reactors are also used to treat waste containing a mixture of soluble and suspended organics. Anaerobic digestion reactors without sludge return are used for stabilizing suspended organic matter at high concentrations and containing a high initial population density. 1 Anaerobic Fixed Bed Reactors An anaerobic fixed bed reactor is a bioreactor in which the anaerobic organisms grow as a biological film on the surface of a non-moving supporting material.

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