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Vegetable Oil Processing Sub-sectoral Environmental and Social ab0cd Guidelines: Vegetable Oil Processing PROCESS DESCRIPTION are used in food applications, animal feed, cosmetics, detergents, paints, plastics, candles, Vegetable oils are extracted from seeds, beans, pharmaceuticals, biofuels and many other fruits and nuts. The basic steps in the process are technical applications. shown in the figure below. SUMMARY OF KEY ENVIRONMENTAL, Seeds/ Beans HEALTH AND SAFETY RISK/LIABILITY ISSUES Cleaning/Drying/ Sorting/Dehulling Solid Waste Crushing/Heating Filtration Vegetable oil processing can generate significant quantities of organic solid waste such as empty fruit stalks and waste palm kernels. The waste Solvent Degumming Extraction products can normally be used for animal feed. Wet Cake Miscella* Other solid wastes may include: Desolventing Solvent Removal Toasting by Distillation Pressed • Spent bleaching earth: activated clay, silica and Extracted Crude Oil carbon are used in the bleaching process and Crude Oil will contain pigments and residues of other Refining (Physical Drying Cooling undesirable substances such as gums and or Chemical) metals; Semi-refined oil Meals quality • Soap stock and spent acids from chemical refining; Hydrogenation Interestification • Deodoriser distillate; Deodorisation • Mucilage1 from degumming; Fully Refined • Spent catalysts and filtering aid from Product hardening; *Miscella is a mixture of oil and solvent • Sludge arising from the wastewater treatment The extracted crude oil will be refined either by plant which may be contaminated with chemical/alkali refining or by physical means. hazardous chemicals or have a high pH and The primary purpose is to separate the free fatty therefore require careful disposal. acids and remove other unwanted substances. Vegetable oils and fats are an important ingredient in a vast number of products 1 Gelatinous substances secreted by plants providing flavour, texture and structure. They Vegetable Oil Processing Sub-sectoral Environmental & Social Guidelines Page 1 August 2009 Sub-sectoral Environmental and Social ab0cd Guidelines: Vegetable Oil Processing Solid wastes should be stored in adequate • Sulphuric acid – used to subsequently free the containers and segregated where possible to fatty acids from the soap stock; encourage recycling. Solid wastes will need to be disposed of regularly to avoid odour, litter, fly • Phosphoric acid – used in degumming; and rodent problems. • Spent bleaching earth – this material presents Volatile Organic Compounds (VOCs) a fire risk; Solvent is used to separate oil from the vegetable • Hydrogen; matter. Solvent emissions arise from several steps in the process such as the solvent recovery • Other solvents; plant, volatisation during refining and leaks in piping and vents. • Cleaning agents such as detergents. The most common solvent used is hexane, which The transport, storage and handling of such is a colourless volatile liquid, soluble in water and materials provide opportunities for spills and highly flammable and may cause explosions due other releases to the environment and present a to the volatisation of the solvent dissolved in the risk of fire and explosion. oil. Exposure to hexane may cause impaired fertility. Acute inhalation of high levels of hexane Water Supply can cause mild central nervous system (CNS) depression and irritation of the skin and mucous Edible oil extraction can use a relatively large membrane. Prolonged exposure may cause quantity of water throughout the process serious health damage. Hexane is also harmful in primarily for: low concentrations to aquatic organisms. Strict controls are required to prevent a build-up in • Raw ingredient cleaning; working areas and discharges to the environment. • Cooling water in crude oil production; Processors within the EU must comply with the Council Directive 88/344/EEC on extraction • Chemical neutralisation; solvents in foodstuffs and the solvents emissions directive 1999/13/EC. • Washing and deodorisation; Exposure to Other Hazardous Substances • Cleaning process areas; In addition to solvents, a range of other • Steam production. potentially hazardous materials may be used during processing and cleaning, including: Water can be wasted when much of it can be treated and reused in the process. It is typical for • Caustic soda – used to convert free fatty acids abstraction or water use permits to detail volumes into soap stock; of water abstraction allowed as over abstraction can impact local communities. Whenever Vegetable Oil Processing Sub-sectoral Environmental & Social Guidelines Page 2 August 2009 Sub-sectoral Environmental and Social ab0cd Guidelines: Vegetable Oil Processing changes take place in product volumes this associated emissions of gases such as carbon should be reflected in the permit. dioxide. Wastewater Treatment Dust and Aerosols Large volumes of wastewater containing high Dust may arise from storage, handling and drying organic loads, organic nitrogen, oils and fats, activities; aerosols typically arise from the use of cleansing agents, solvents and suspended solids compressed air and high-pressure water for may be produced. The wastewater may also be cleaning. contaminated with pesticide residues. • Workers may inhale or ingest the dust and The main production processes producing aerosols exposing them to biological hazards wastewater are the refinery, deodorisers and which present a risk of occupational lung boilers. The wastewater will require treatment disease. When combined with high levels of before it can be discharged to a municipal humidity they may give rise to skin irritation wastewater treatment system or to the or allergic reactions; environment. Many facilities have on site wastewater treatment plants which may utilise • A dust cloud of any flammable material will mechanical and chemical means of treatment. A explode where: permit with specific discharge parameters from the regulatory authorities will normally be o The concentration of dust in air falls required. within the explosive limits; Energy o A source of ignition. Large quantities of energy are consumed in oil Dust emissions can be controlled by enclosing processing in two ways: processing and transport equipment, which also reduced product losses and the installation of • Thermal energy in the form of steam and hot extraction equipment. water used for distillation, cleaning, and sterilising. Frequently an auxiliary boiler is OTHER ENVIRONMENTAL , HEALTH used to generate steam; AND SAFETY RISK/LIABILITY ISSUES • Electricity for machinery operation, Packaging refrigeration, lighting and production of compressed air. Minimum refrigeration Extracted oil is typically packaged in plastic, cans requirements are normally determined by and glass. Where possible companies should regulation. attempt to recover packaging or should ensure that the packaging is easy to recycle. Solid waste Energy usage has a direct correlation to the will arise from the packaging process in the form operating costs of the company and energy of discarded packaging offcuts. Waste oils generation and consumption may be regulated or should be recovered and reprocessed, e.g. into taxes/levies applied to reduce energy use and biofuels. Vegetable Oil Processing Sub-sectoral Environmental & Social Guidelines Page 3 August 2009 Sub-sectoral Environmental and Social ab0cd Guidelines: Vegetable Oil Processing Companies operating with the European Union well as manoeuvring trucks can be a nuisance (either as a manufacturer or as a supplier into if the site is located close to residential areas European Union countries will be subject to the and other sensitive receptors. European Union Packaging and Packaging Waste Directive (94/62/EC), which aims to reduce the • Noise induced hearing loss can occur from amount of packing that is being introduced into working in noisy areas, e.g. internal transport, waste streams. conveyors, boilers, pumps, fans, and steam and air leaks; Permitting Machinery & Sharp Edges Operations within the EU with a finished food product production capacity greater than 300 All equipment should have safety guarding and tonnes per day will be subject to national workers should be issued with appropriate regulations under the Integrated Pollution personal protective equipment to protect against Prevention and Control Directive (2008/1/EC), unavoidable sharp items and edges. Particular which requires the use of the best available attention should be paid to conveyors, mills and techniques and a programme of continuous packaging machinery; environmental improvement. Other smaller facilities within the EU and operations outside Manual Handling & Repetitive Work the EU will still be subject to local regulation but this will generally set less stringent requirements Lifting, repetitive work and posture injuries occur on the techniques to be adopted. as a result of lifting and carrying heavy or awkward shaped items and solid wastes. Storage Issues Repetitive tasks can lead to musculoskeletal injuries; Bulk storage facilities will be used for the storage of oil seeds and beans, gas and liquid chemicals Slips, Trips & Falls used in the production process and for cleansing and disinfection, and fuel oils for energy Slippery floors and surfaces caused by oil and fat production. These storage facilities should be deposits present a high risk of slips, trips and falls provided with satisfactory containment (concrete where spills have not been cleared up or effective walls/bunds, recessed drainage gullies connected
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