Em Novembro passado aconteceu um evento nos EUA denominado “2013 Direct Potable Reuse”, organizado pela “Water Reuse Association” ( http://www.watereuse.org/association ), onde o foco foi o reuso DIRETO de efluentes para fins potáveis.
Foi uma conferencia de altíssimo nível técnico e, ao que tudo indica, trata-se de um assunto que vai crescer muito, seja pela diminuição da disponibilidade de água bruta de boa qualidade nos grandes centros consumidores, seja pelo aumento da população urbana ( demanda ).
O website www.wateronline.com publicou hoje esta notícia abaixo que também trata do mesmo tema e reitera nossa percepção sobre essa tendência.
É bom irem se acostumando com este assunto, pois ele estará cada vez mais em evidência. Também é bom nos prepararmos para uma nova legislação que permita a aplicação das tecnologias para reuso de alta qualidade.
Para nós, técnicos do setor, cabe a responsabilidade de tratar o assunto de forma responsável e realista, sem opiniões pré-concebidas e preconceituosas.
Eng. Eduardo Pacheco
Portal Tratamento de Água
Industrial Heat Used To Make Waste Water Drinkable
Engineers from Siemens are exploring methods for recycling the surfeit heat generated by industrial processes and using it to convert waste water into potable water.
Engineers from Siemens in Germany have built a demonstration plant which is capable of employing the low-temperature waste heat emitted by industrial processes for the conversion of waste water into potable water for consumption.
The waste water flows into the prototype via insulated piping, where it traverses a series of heat exchangers which employ the excess heat generated by industrial equipment to bring the water to a higher temperature.
The waste water then enters an evaporator where it is converted into steam and channeled upward into a condenser via the use of an electric fan. The condenser will then be able to convert the steam back into pure water which is potable, as well as concentrated waste water which can be more conveniently disposed of.
The chief advantage of the new prototype devised by the German engineers is its ability to utilize industrial waste heat lying within the low-temperature range of between 70 to 120 degrees Celsius, which is difficult to employ in an efficient manner despite containing valuable energy which can be applied to ancillary processes.
The key to this ability is the development by Siemens engineers of a heat pump which makes use of a special process fluid for the heat cycle and which is capable of pushing the temperature of moderate waste heat to as high as 140 degrees Celsius, thus increasing its range of potential applications.
The heat pump can be used to give a boost to geothermal sources of heat as well as industrial waste heat, and for other purposes such as the provision of warmth to building.
Potential applications for the water purification technology include the purification and conversion of waste water generated by the brewing industry or oil drilling operations.
Researchers now plan to expand the scale of the prototype with the construction of a pilot facility capable of processing 25 cubic metres of water per hour – enough for the technology to be used for the treatment of the large volume of waste water generated by certain industrial processes, such as bottling in brewery operations.
SOURCE : Siemens - http://www.wateronline.com/