The use of mixed effluent liquid wastes as a source of valuable nutrients (original) (raw)

The utilisation of anaerobic digester effluent streams as a potential source of nutrients

Proceedings ,Venice 2012, Fourth International Symposium on Energy from Biomass and Waste, 2012

Valuable nutrients can be recovered using filtration technology from complex waste effluent sources, allowing carbon based materials to be recycled and reused. Nutrients such as phosphate , ammonia and carboxylic acid can be directly applied in a wide range of fields in presents day industry including their use in the fertilizers production industry, textiles, cosmetics in the food industry. To address this challenge, effluents deriving from anaerobic digestion, were utilized for the recovery of these materials using filtration technology. This neutral process will consist a valuable carbon neutral waste processing strategy that is highly beneficial for the environment while providing industry with materials and reasonable cost.

Nutrient recovery from anaerobically digested organic wastes

Linnaeus Eco-Tech

Effluents (digestates) resulting from anaerobic digestion of wet organic wastes can berecycled as fertilizers. Separation of such digestates into a wet and a dry fraction is common.The solid fraction is often sold as a soil enhancement product while the liquid fraction isusually discarded as wastewater. A large portion of the digestate nutrients is dissolved as ionsin the liquid. The aim of this study is to establish an efficient way to convert this into a liquid"organic fertilizer". Enhancement of the nutrient concentration is necessary in order to makethe final product commercially acceptable. Direct evaporative concentration is not suitable asit would lead to a significant loss of ammonia due to the fact that most of the availablenitrogen in these digestates is present in the ammonium/ammonia form. Thus stabilizing theproduct by partial nitrification prior to evaporation is proposed based on a series ofexperiments conducted to evaluate the appropriateness of this approa...

Energy Recovery from Residual Waste by Means of Anaerobic Digestion Technologies

Anaerobic digestion is largely based on a sequence of biochemical steps (hydrolysis, formation of volatile fatty acids and acetic acid, conversion into methane and carbon dioxide) and is hence a relatively slow process that can be seriously retarded by inhibitors and toxicants. Moreover, part of the organics (plastics, rubber, wood, lignin in board & paper…) do not degrade and, depending on process conditions, the bacteria responsible for various stages in the process show quite distinct growing rates, yet must still cohabitate harmoniously. Large molecules and hydrophobic substrates either require special pre-treatment for rendering digestion possible, or remain almost unchanged in a moist residue, the digestate. Treatment technology is subdivided into batch and continuous processes, continuous single step and double or multiple step (staged) digestion, vertical and horizontal treatment units, with various flow arrangements and mixing methods, meso- and thermophilic processes, and ...

Innovative Processes and Technologies for Nutrient Recovery from Wastes: A Comprehensive Review

Sustainability

Waste management is necessary for environmental and economic sustainability, but it depends upon socioeconomic, political, and environmental factors. More countries are shifting toward recycling as compared to landfilling; thus, different researchers have presented the zero waste concept, considering the importance of sustainability. This review was conducted to provide information about different well established and new/emerging technologies which could be used to recover nutrients from wastes and bring zero waste concepts in practical life. Technologies can be broadly divided into the triangle of nutrient accumulation, extraction, and release. Physicochemical mechanisms, plants, and microorganisms (algae and prokaryotic) could be used to accumulate nutrients. Extraction of nutrient is possible through electrodialysis and crystallization while nutrient release can occur via thermochemical and biochemical treatments. Primary nutrients, i.e., nitrogen, phosphorus, and potassium, are...