LEAN OIL EXTRACTION PLANT  

THE COMPANY

The Lean Oil Extraction Plant is located in the community of El Astillero on the Atlantic coast of Honduras. It began operations in 1993 and has an installed capacity of 60 tons per hour. Its products include fruit and nut oil, in addition to “coquito flour”, which are obtained through the cultivation and harvesting of the company’s own plantations of African Palm.

THE PROCESS

Operations start with the planting and maintenance of plantations. In the fourth year, the first fruit is harvested, and it is taken directly to the factory, where the oil manufacturing process begins. It involves ten steps:

1) Arrival of the fresh fruit. The clusters are weighed and sent to quality control, where they are loaded onto sterilization carts.

2) Sterilization of clusters. The fruit is put through special sterilizers for three different purposes:

  • Inactivation of lipase
  • Acceleration of the process of separation of fruit peduncles, or buttons
  • Preparation of nuts for cracking

3) Fruit removal.
Clusters are put through rotary fruit removers, which allow the fruit, but not the rachis or stems, to go through.

4)Processing of rachis. The rachis is pressed, and oily sludges are extracted from it that are used in the process. The remaining fiber is steam dried and used as fuel for the boiler.

5) Digestion of fruit. The fruit is put through a digester with agitator arms, and it is heated by steam.

6) Pressing of fruit. The fruit is crushed in double-screw presses, and the oil that is pressed out is taken to the clarification section.

7) Clarification. The impurities in the oil are removed to the greatest extent possible, through various means.

8) Sorting. The nut of the fruit is recovered by separating the fiber from the nut. The fiber is then sent to the boiler to be used as fuel, and the nuts are stored.

9) Extraction of nut oil. This involves different steps—including drying, cleaning, cracking, screening, cooking, pressing, and filtering of the fruit—which lead up to the actual extraction of the nut oil. A residue is obtained as a by-product, which is pulverized and stored until final disposal.

10) Waste handling. The process generates emissions and solid wastes that affect the atmosphere and watercourses.These wastes are given proper treatment until they meet allowable parameters under the environmental standards in effect.

Process Flow Diagra


 


ENVIRONMENTAL STRATEGY

From the time operations began, the plant processes had shortcomings, such as atmospheric emissions, wastewater, and solid wastes, and the company faced serious problems with the residents of nearby communities. After an exhaustive environmental audit was made, an environmental strategy was devised called the Environmental Corrective Plan. Designed to reconvert the process to environmentally friendly technologies, it included optimization of processes, proper handling of solid wastes, and regulation of emissions, with the goal of achieving allowable parameters under national and international environmental standards. The plan also included industrial and worker safety, occupational medicine, and a good-neighbor policy.

This strategy was subdivided into three different programs, with emphasis on the first in explaining the plan's main objective:

  • Reconversion of the Process
  • Health and Safety
  • Good-Neighbor Policy
Reconversion of the Process The goal of this program is to maintain the volume of emissions and solid wastes within the environmental standards that are in effect. The program seeks to improve the process to make it more efficient, while at the same time ensuring proper practices in handling and production through the purchase of environmentally friendly equipment, materials, and supplies. Health and Safety

The purpose of this program is to maintain continuous worker training, avoid work-related accidents, and encourage workers to do their jobs the right way by providing them with improved benefits and a safer working environment. All this is being done in accordance with the standards in effect for worker and industrial safety.

Good-Neighbor Policy

One of the company’s goals was to improve its relations with the community. In achieving this, it carried out a program that concentrated on open communications with the community at large and with its workers, in addition to providing support for a number of educational, reforestation, and environmental improvement programs.

ECOEFFICIENCY EXPERIENCES

This case documents the company’s experiences during the reconversion process. The problems that appeared during the implementation of this program are the following:

1) Poor knowledge of material flow in the process.

2) Massive generation of rachis or stem waste, which caused a proliferation of flies when it was sent to company yards.

3) Accumulations of large amounts of waste material in company yards.

4) Emissions of particulates into the atmosphere in excess of the standards in effect.

The following points show the solutions to these problems and the resulting benefits:

1) Solutions

  • Achievement of a material balance in the oil production process.
  • Implementation of the best practices in handling the process, with the goal of optimizing it.
  • Continuous training and supervision of personnel, as well as measures for industrial safety.

   Benefits

  • Full knowledge of material flow.
  • Decreased losses.
  • Optimization of the process.
  • Activities being performed with trained personnel.

2) Solution

  • Purchase and setup of a rachis press.

    Benefits

  • Recovery of more oil.
  • Extraction of enough moisture to enable quicker and more efficient use of rachis as a fuel in the generation of energy.
  • Self-sufficiency in generation and co-generation of energy during the peak season with the National Electric Power Company (ENEE). The energy generated is also totally clean because it comes from biological processes.
  • Utilization of organic matter residue in the African Palm plantations as organic fertilizer, after applying a proenzyme accelerator in the decomposition process.
  • Elimination of the proliferation of flies.

3) Solutions

  • Sales of recyclable material.
  • Donation of wood scraps to employees and residents living near the factory.
   Benefits
  • Strengthening of relations among the company, its neighbors, and its employees.
  • Improvements in the appearance of the plant.
  • Generation of additional income for the company.

4) Solutions

  • Purchase of an efficient boiler capable of making automatic adjustments within 30 seconds during the combustion process.
  • Implementation of a program that monitors emissions twice a year.
    Benefits
  • Compliance with environmental standards for emissions to the atmosphere.
  • Strengthening of the credibility of the process among neighbors and the governmental and non-governmental institutions involved.
RESULTS

Among the most important results are the following:

  • Self-sufficiency in the generation of clean energy due to the fact that it is generated by biomass boilers.
  • Co-generation of energy during the peak season (1,000 kW/h).
  • Reduction in emissions to below what is allowable by the standard.
  • Optimization of the process.

Reforestation, which has a significant impact due to the fact that it enables the pickup of some 84,000 tons of CO2 over 3,000 hectares planted with African Palm in the area surrounding the company. These lands were formerly either banana plantations or grasslands for cattle grazing (ratio used is 28 tons of CO2 per hectare planted).

The following tables show the monitored rates for atmospheric emissions and for wastewater discharges into receiving bodies after the reconvertion of the process. These rates are also compared with those accepted by the World Bank. It may be observed that the company rates are under the established maximum for all parameters.

Atmospheric Emissions
Parameter

Observed Rate

(mg/nm3)

Allowed Rate*

(mg/nm3)

NO2

93.3

  600

SO2

0

1,000

Total Suspended Solids(TSS)

33.3

  100

Particles Under 10 Micras (PM10)

                     13

    50

* World Bank

Wastewater Discharges into Receiving Bodies

Parameter

Observed Rate

(mg/l)

Allowed Rate*

(mg/l)

pH

6.6

6-9

Temperature

23°C

+/- 3°C environmental temperature

Biochemical Oxygen Demand (BOD5)

2

50

Chemical Oxygen Demand (COD)

10

150

Total Suspended Solids (TSS)

13

50

Oils and Fats

9

10

Coliforms

-

< 400 NMP

* World Bank

MAIN COMMITMENTS AND CHALLENGES

The company has a serious commitment to continuous improvement and the environment. One of its goals in the medium term is to achieve environmental certification. It also seeks to increase its production while at the same time ensuring proper environmental performance, which will enable it to diversify its markets.

GLOSSARY

Lipase: Enzyme that breaks down fats
Rachis: The shaft of a stem
Peduncle: Button or bloom of a leaf, flower, or fruit
Biomass: Mass of living matter that is in an environment

CONTACT

Ing. Daniel Ayes
Manager of Environmental Management Unit
Corporación Cressida
Blvd. Suyapa frente al Comisariato Popular
Apartado Postal # 684
Tegucigalpa, Honduras
Tel. (504) 232 8070/73 Ext. 300
Fax (504) 232 6127