Abstract
Slaughterhouses produce a large amount of wastewater, therefore, with respect to the increasing water scarcity, slaughterhouse wastewater (SWW) recycling seems to be a desirable goal. The emerging challenges and opportunities for recycling and reuse have been examined here. The selection of a suitable process for SWW recycling is dependent on the characteristics of the wastewater, the available technology, and the legal requirements. SWW recycling is not operated at a large scale up to date, due to local legal sanitary requirements as well as challenges in technical implementation. Since SWW recycling with single-stage technologies is unlikely, combined processes are examined and evaluated within the scope of this publication. The process combination of dissolved air flotation (DAF) followed by membrane bioreactor (MBR) and, finally, reverse osmosis (RO) as a polishing step seems to be particularly promising. In this way, wastewater treatment for process water reuse could be achieved in theory, as well as in comparable laboratory experiments. Furthermore, it was calculated via the methane production potential that the entire energy demand of wastewater treatment could be covered if the organic fraction of the wastewater was used for biogas production.
Highlights
Providing all people with drinking water, food and energy are three of the central challenges of modern times
In this study, recycling possibilities of treated wastewater were classified into four categories which are namely: wastewater discharge, process water reuse, reuse without product contact, agricultural irrigation
Requirements related to the quality of the wastewater were presented for each category according to the state of the art
Summary
Providing all people with drinking water, food and energy are three of the central challenges of modern times. Due to the increasing growth of the world population and the rising standard of living, the demand for resources is rising, in particular the consumption of fresh water [1,2]. According to the Food and Agriculture Organization of the United. 1.8 billion people are expected to live in countries or regions with absolute water scarcity (
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