Method for treating and obtaining sub-products from residues proceeding from olive mills

Summary of the technology

UGR has developed a procedure for treating residues from olive mills allowing to obtain sub-products with high added value for industry, through the use of clean technologies, without addition of external solvents or other agents during the process avoiding to generate additional residues. Along with residues treatment, the revalorization of effluents is achieved as a potential and profitable source of high-value antioxidants in the market and agro-food, cosmetic, pharmaceutical and biotechnological industries.

University of Granada (OTRI)
University of Granada (OTRI)

Details of the Technology Offer

The present invention tries to solve the problem of the sub-products or solid and liquid wastes from olive mills. Olive pomace, “alpeorujo”, olive pit, “alpechín”, water used for washing olives , water used for washing oil and brine are considered as residues from olive mills.

The residues obtained in the treatments used in olives in olive mills for obtaining olive oil do not accomplish the regulations to be spilled in public courses or sewage systems, nor used for irrigation activities due to the highly contaminant charge. Those wastewaters show a high amount of residues, such as dust, soil, oils and fats, carbohydrates, nitrogenated substances, organic acids, polyalcohols, polyphenols, etc. Among them, polyphenols and fats are the ones that show bigger problems, due to their polar and hidrophobic properties, respectively. The way for eliminating those polyphenols is through a physical-chemical process, due to the inhibition activity that show over microbiological processes.

The traditional way for treating waste products has been the storage in ponds, where the residue is being reconcentrated through time, so the contaminant power progressively increases. Another problem is that the capability of the ponds is limited, leading to build new ponds, which entails associated problems such as possible overflows, penalties and paralyzation of activities, slowing down the implementation of quality management systems, air pollution and plagues of several insects species.

The present invention depicts a new procedure for treating these residues, comprising the mixing of solid and liquid residues, a extraction without additional solvents at room temperature and without high pressure and a final solid-liquid separation phase. Later, sustainable filtrations steps allows to attain biomass, clean water and a extract highly loaded with polyphenols

Another invention is a system for treating residues proceeding from olive mills and obtaining sub-products of industrial interest that comprises the means for carrying out the procedure in any of the possible implementations:

  • Retirement of olive pits
  • Mixture tank
  • Hydrolysis reactor
  • Agitator
  • Centrifuge
  • Mechanic system for retiring the oil phase
  • Membrane equipment for nanofiltration
  • Spray-drying equipment

Advantages and Benefits

  • Simple and safe procedure. It uses clean or “green” technologies, avoiding at any time using external reagents throughout the process.
  • Allows the reutilization of the equipment and currents of the olive mill, thus requiring a minimal investment for the membrane equipment.
  • Technically, energetically and economically efficient.
  • The process and exploitation of sub-products allows to make profitable the olive oil mill throughout the year.
  • The procedure uses the currents of sub-products to obtain a stream rich in high-added value antioxidant compounds where polyphenolic compounds are plentiful.
  • A reduced organic current is obtained, which can be used either for watering or can be discharged.
  • The other organic current obtained has high concentrations of hydroxytyrosol and other added-value products, with antioxidant, antimicrobial, anti-inflammatory and anticarcinogenic properties.
  • Availability of natural antioxidants instead of artificially obtained antioxidants

Recovery of the polyphenolic fraction contained in wastewaters of oil industry can reduce the toxicity of those wastewaters and boost the purification, thus fostering their sustainability and management of them (environmental and agroalimentary industry)

Current development status

Experimental technologies

Desired business relationship

Technology selling

Patent licensing

Technology development

Intellectual property status

  • Patent already applied for
  • Patent application number :P201730477

Related Keywords

  • Industrial Technologies
  • Clean Industrial Technologies
  • Agrofood Industry
  • Protecting Man and Environment
  • Waste Management
  • Industrial Products
  • membrane technology
  • olive oil
  • effluents
  • residues
  • polyphenol
  • advanced oxidation
  • antioxidants
  • valorization
  • olive mill

About University of Granada (OTRI)

The mission of the Research Results Transfer Office (OTRI, for its initials in Spanish) of the University of Granada (UGR) is to identify and valorize R&D results for their commercialization by industry and entities worldwide.
The OTRI is integrated into the Vice-Rector’s Office for Research and Technology Transfer, which activities are aimed at:

• UGR researchers for the valorization of their knowledge in the socio-economic environment;
• Companies, by building strategic bonds with the university to improve their competitiveness;
• Entrepreneurs of the academic community for the setting up of spin-off companies.

University of Granada (OTRI)

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