Integrated Odour Removal and Waste Water Treatment
As a result of their involvement with landfill leachates and the successful integration between the waste water treatment and the dust and odour removal scrubbing process (which was referred to in the Solid Wastes section) RPA has maintained an interest in the biodegradability of the more complex and/or refractory organics that are associated with some difficult odours, with some leachates and with some industrial waste waters.
A key feature of the integration between the odour control system and the effluent treatment process was the arrangements which ensured that the scrubbing fluid always had a high bio-activity, irrespective of the odour load. This meant that whenever there was a sudden increase in the rate of release of odour, the odour would always be taken out.
In the situation where a suitable integration with an associated waste water treatment is not feasible or not adequate, RPA have evolved techniques whereby a combination of processes can produce adequate odour removal without incurring excessive reagent consumption. These techniques are not universally applicable, but they do considerably extend the range of application.
One of the techniques involves the use of specific augmentation of the waste water treatment processes using proprietary bioactive/bio-enhancing additives. Unfortunately, many of these augmentations achieve little more benefit than would be achieved by proper attention to appropriate design details and operating controls. However, RPA have identified additives, which are particularly effective in the lagoon environment for breaking down refractory COD’s, for removing odours and for both the reduction in sludge production and the digestion of existing sludges within operating lagoons. These have been effective in a number of areas where naturally developed bio-populations have become very slow and/or other additives have been inadequate
In relation to these additives, RPA’s experience has been with:-
- lagoons and sludge residues containing effluents and residues from coke ovens and coal tar processing
- lagoon and sludge residues containing mineral oils and animal fats in the presence of large concentrations of heavy metals
- lagoons with high ammonia, cyanide and ammoniacal nitrogen contents
- lagoons with high levels (from an odour production perspective) of organic sulphur compounds.
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