scholarly journals Potential for Production of Biochar-Based Fertilizers from Olive Mill Waste in Mediterranean Basin Countries: An Initial Assessment for Spain, Tunisia, and Greece

2020 ◽  
Vol 12 (15) ◽  
pp. 6081 ◽  
Author(s):  
Evan A.N. Marks ◽  
Vasiliki Kinigopoulou ◽  
Hanene Akrout ◽  
Ahmed Amine Azzaz ◽  
Charalampos Doulgeris ◽  
...  

Olive mill wastes continue to be a management challenge due to the large volumes produced, particularly due to their toxicity and impacts on the environment. Thermal conversion through pyrolysis or hydrothermal carbonization techniques can detoxify wastes while conserving nutrient contents. In this work, we produced up-to-date data on olive mill waste flows in Spain, Tunisia, and Greece and characterized representative samples in the laboratory. Assays of thermal conversion of olive mill wastewaters and solid wastes were also performed to understand biochar yields and final properties, and the total quantities of nutrients contained were estimated. Of particular note were the quantities of potassium in Tunisian wastewaters, representing 0.6% of the total mass and an annual flow of approximately 5000 t, and in the Spanish solid wastes, an average of 1.7% of the total mass is potassium, representing an annual flow of approximately 23,000 t. Concerning phosphorus, Spanish solid wastes had the highest contents (0.1%), double that of other countries’ wastes. Annually, olive mill wastes from the three countries are estimated to contain approximately 35 × 103 tons of potassium and 2.6 × 103 tons of phosphorus. With this resource converted to biochar, each year more than 700 km2 of soils could be enriched in 0.2% carbon with biochar at an application rate of 7 t ha−1.

2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
Spyridon Ntougias ◽  
Kostas Bourtzis ◽  
George Tsiamis

Olive mill wastes (OMWs) are high-strength organic effluents, which upon disposal can degrade soil and water quality, negatively affecting aquatic and terrestrial ecosystems. The main purpose of this review paper is to provide an up-to-date knowledge concerning the microbial communities identified over the past 20 years in olive mill wastes using both culture-dependent and independent approaches. A database survey of 16S rRNA gene sequences (585 records in total) obtained from olive mill waste environments revealed the dominance of members ofAlphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Firmicutes,andActinobacteria. Independent studies confirmed that OMW microbial communities’ structure is cultivar dependant. On the other hand, the detection of fecal bacteria and other potential human pathogens in OMWs is of major concern and deserves further examination. Despite the fact that the degradation and detoxification of the olive mill wastes have been mostly investigated through the application of known bacterial and fungal species originated from other environmental sources, the biotechnological potential of indigenous microbiota should be further exploited in respect to olive mill waste bioremediation and inactivation of plant and human pathogens. The implementation of omic and metagenomic approaches will further elucidate disposal issues of olive mill wastes.


2020 ◽  
Vol 143 ◽  
pp. 105875
Author(s):  
Marianela Gimenez ◽  
Manuel Rodríguez ◽  
Laura Montoro ◽  
Fabiana Sardella ◽  
Guillermo Rodríguez-Gutierrez ◽  
...  

Planta Medica ◽  
2014 ◽  
Vol 80 (16) ◽  
Author(s):  
K Vougogiannopoulou ◽  
H Pratsinis ◽  
R Grougnet ◽  
M Halabalaki ◽  
D Kletsas ◽  
...  

2019 ◽  
Vol 18 (6) ◽  
pp. 1297-1309
Author(s):  
Antonis A. Zorpas ◽  
Maria K. Doula ◽  
Vassilis J. Inglezakis ◽  
Jose Pedreno Navvaro ◽  
Dimitrios J. Bilalis

2021 ◽  
pp. 1-17
Author(s):  
Anna Assimakopoulou ◽  
Ioannis Salmas ◽  
Aikaterina Tsikra ◽  
Alexandros-Iasonas Bastas ◽  
Maria Bakea ◽  
...  

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