DOST-PCAARRD T to P: Promoting the R&D Gains of 2018 on Seaweeds Drying


By Estrella Z. Gallardo

The Department of Science and Technology – Philippine Council for Agriculture, Aquatic and Natural Resources Research and Development (DOST-PCAARRD) in an effort to promote the R&D Gains of 2018, conducted a Technology to People (T to P) presentation at the Elvira O. Tan Hall, PCAARRD Headquarters, Los Banos, Laguna on February 27, 2019.

Other than the topics presented, Improvement of Microalgae Paste Production for Aquaculture titled Juan Algae, microalgae paste, is a cost effective feed for milkfish hatcheries, discussed by Project Leader Ms. Saledad S. Garibay, University of the Philippines in the Visayas, (UPV), Iloilo City, the Drying system for seaweeds developed was likewise discussed by Dr. Ronnel S. Pangan, Engineer III Center for Agri-Fisheries and Biosystems, Mechanization (BIOMECA), UPLB, College, Laguna).


Drying system for seaweeds developed


Seaweed farming is a good source of income especially for the people living in coastal areas. However, seaweeds grown by the farmers must undergo drying before these are sold to the processors for carrageenan production. The drying process is crucial in order for them to command a better price. The usual drying practice employed by the farmers is to sun dry the harvested seaweeds in open areas which exposes the seaweeds to sudden changes in weather, particularly rain. The quality of the seaweeds is greatly affected when exposed to rain. This is the reason why the seaweeds are covered when there is a probability of rain or collected and placed in a temporary storage area and wait for good weather. To address this problem, it is imperative to develop a drying technology appropriate for our local seaweed farmers in order for them to readily dry their harvest and be assured of better price.

Floating-type seaweed drying system which uses a drum floatation device (Image credit: Marine Resources Research Division (MRRD), PCAARRD)

A seaweed drying system was developed by the University of the Philippines Los Baños (UPLB) – Center of Agri-Fisheries and Biosystems Mechanization (BIOMECH) under the leadership of Dr. Ronel S. Pangan. The design was based on the survey conducted in the different seaweed growing areas of the country.

The developed drying system, which can likewise be utilized for air drying, ensures that the seaweeds being dried will not be exposed to sudden downpours that can damage the seaweeds.

There are two types of drying system that were developed based on the structural foundation used, namely: a) the floating-type seaweed drying system which uses drum floatation device and can be towed near the farmers’ production areas and b) the permanent-type seaweed drying system constructed permanently inland using concrete footings. The mobility of the floating-type dryer is an advantage especially for seaweed farms located far from the community. Reduction in hauling time is achieved since, instead of hauling fresh seaweeds from production site to shore where traditional drying is undertaken, dried seaweeds is now transported. The permanent-type dryer on the other hand which is equipped with sturdier foundation posts constructed near the shore provides easy access for the farmers.

Results of the field testings showed that this drying system was capable of drying newly harvested seaweeds at a much faster rate compared to the existing drying practices of the farmers and that the technology can be used even in the absence of solar heat and can continually dry even during rainy or cloudy days by using air drying technique.

 (MegaManila Science Journalists)

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