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Technical guidelines on hazardous wastes: physico-chemical treatment (d9) and biological treatment (d8)
… is passed through a tank containing an established biomass-rich active sludge, which is agitated and aerated. During its residence in the tank the conditioned biomass metabolises biodegradable substrates in the effluent. … and a sludge which is recycled to the tank. Excess biomass is removed regularly to maintain the equilibrium of …