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Aims The changes in chemical composition and metabolizable energy (ME) of both olive mill waste (OMW) upon fermentation by three potential probiotic Rhizopus oryzae strains and commercial feed (CF) upon its supplementation by fermented olive mill waste (FOMW) were investigated. The objective was to test whether there will be an enhancement in the nutritional value of OMW after fermentation and/or commercial broiler feed upon supplementation by potentially probiotic filamentous fungi. Methods and results A three Rhizopus oryzae strains (92/1, 236/2 and 284) isolated from agricultural soil that were proven to have good probiotic properties (non‐toxic, antimicrobial activity, antioxidant capacity and gastrointestinal tolerance) were used to ferment OMW, then the chemical composition was analysed after 7 and 14 days of fermentation. The FOMW with the R. oryzae 284 strain, which gave the best results, was added to a commercial broiler feed at 20%, 30% and 40% supplementation ratios. Then proximal analyses were done to compare non‐supplemented with supplemented CF. Chemical analyses included dry weight, crude protein, crude fats, crude fibres, crude ash, sugars and starch, and then ME was calculated from the given values. Conclusions Compared to non‐fermented OMW, the best results were obtained by the R. oryzae 284 strain allowing an increase in crude protein content by 23.4% after 7 days of fermentation, a decrease in crude fibre content by 9.8% after 14 days of fermentation and an increase in ME by 3.6% after 7 days of fermentation. Compared to non‐supplemented CF, the ME changes of 20%, 30% and 40% supplementation increased by 8.38%, 2.83% and decreased by 4.27%, respectively. Significance and Impact of the Study FOMW can be incorporated into broiler feed rations until 30% without causing any decrease in metabolizable energy. It can be a cheaper alternative with promising productivity and chicken health improvements.

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Developing nations must locate their manufacturing operations where available resources and facilities make them most efficient. The presence of more than one third of the Egyptian industries in urban Alexandria has placed an undue burden on natural resources and has aggravated pollution problems. The U.S. Environmental Protection Agency (EPA) is conducting a study to identify existing and future industries in Alexandria, estimate the solid wastes produced by these industries, examine methods of reusing solid and other wastes, and assess the feasibility of these methods from the technical, economic, and environmental points of view. This paper presents a summary of the first phase of the EPA project, which encompasses surveys of residues from industrial sources in Alexandria. Studies to date indicate that wastes from various industries can be recovered economically. Wastes such as tin cans, glass, wastepaper, and food residues from processing of fruits, starch, and beer are examples of reusable industrial wastes in Egypt. The results of experimental studies for reuse of residues from oil refining, starch and yeast processing, and steel pickling are presented. Spent clay from edible oil refining is currently discarded, causing both handling and disposal problems. This clay contains as much as 40% oil; 90% can be recovered by extraction. The recovered oil can be successfully used in soap production, and the spent clay can be reused in oil bleaching. Other examples include starch and yeast wastes, which can be used for animal feed, and spent pickling liquor, which can be used as a coagulant aid for treating paper mill wastewater. A centralized system for collecting and treating hazardous residues is proposed to permit economical recovery of valuable materials.

The water usage and waste loads were determined for ten unit operations in a modern poultry processing plant in Alexandria, Egypt. Concentrations of 10 wastewater parameters and 9 heavy metals, identification of 12 bacteria and enumeration of both total aerobic and coliform bacteria in the wastewater from these unit operations were determined to evaluate the potential for water reuse. In the scalder, washer and chillers, bacterial counts in the water and on the carcasses were directly related and increased with the length of water usage. Based on the study, countercurrent water use through the chillers and washer was planned after applying renovation measures for grease and bacterial reductions. Compressor cooling water quality was satisfactory for reuse in the scalder.