RECOVERY OF ALGAE FROM POND TREATMENT SYSTEMS

Werribee Treatment Plant
Melbourne, Australia

Waste Stabilization Ponds are used extensively for sewage treatment in moderate and
tropical climates, and represent one of the most cost-effective, reliable and easily
operated processes for the treating domestic and industrial wastes. One of the biggest
problems associated with pond treatment, however, is the high algae concentrations in the
effluent. In many cases algae are not a desirable by-product and are themselves a source
of secondary pollution, rich in carbonaceous and nitrogenous algae matter. This puts an
environmental strain on the receiving waters. One of the recently improved ways to
control algae is to use trickling filters with a heterotrophic biofilm created by augmenting
readily available sustenance to the filter media. This paper examines some of the hybrid
facilities being used that combine existing stabilization ponds with trickling filters or
activated sludge for enhanced biological degradation and polishing of the final effluent.

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Posted: May 20th, 2011 | Filed under: >1M, Waste Water Treatment | Tags: Algae Removal, Improved Plant Effluent, Improved Water Quality, Plant Sustainability, Reduced Carbon Footprint, Reduced Nitrogen Load, Reduced Nutrients, Reduced Solids | No Comments »

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Introduction of Solar Drying Technology to Trinidad and Tobago

Malabar Wastewater Treatment Plant
Trinidad and Tobago

Sustainable wastewater solids management constitutes a serious challenge to the overall initiative of improvement of the wastewater systems by the local authorities in Trinidad and Tobago. The solids treatment approaches must be focused on the effectiveness of the processes and its durability. The selected approach must also integrate local and regional settings, as well as current and future environmental limiting conditions. It is concluded that the proposed process of solar drying will allow measurable scientific, environmental and economic benefits. Based on the analysis of the local weather conditions and estimated solids production rate of 17,600 tonnes per year, a total of 6 solar dryer cells covering an area of 7,450 m2 are required. The biosolids produced from the process is expected to have a minimum solids content of 70% and to have a significant vector attraction reduction. This fully automated and simple technology will enable minimum operator’s attention. Source: WEFTEC 2009 Proceedings

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Posted: August 27th, 2010 | Filed under: Waste Water Treatment | Tags: Cost Savings, Energy Savings, Environmental Impact, Reduced Carbon Footprint, Reduced Solids | No Comments »

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