A WASTE-TO-PRODUCT MODULE FOR MARINE RECIRCULATION SYSTEM Hii, Yii Siang Faculty of Agrotechnology and Food Science, University Malaysia Terengganu 21030 Kuala Terengganu, Terengganu
Background • World population: 10 billion (6.6 billion July, 2007) • Demand for seafood protein increases significantly. • Capture fisheries at its current stage is believed to be imminent maximum sustainable yield (FAO, 2005).
Aquaculture, a potential solution to cover shortage of the seafood supply. • Aquaculture is not a totally effective solution. • Aquaculture is reported to have potential environmental effect (GESAMP, 1996)
“Development that meets the needs of the present without compromising the ability of future generations to meet their own needs” --- Brundtland commission, 1983 United Nation, 1987
Sustainable aquaculture should cover at least four major aspects: • Environment • Economics • Food safety • Technical viability (NACA/FAO, 2001)
Most of the aquaculture activities; especially in Asia are not in a "sustainable" manner.
High cost • Immature system development • Fluctuating market price • Risk of Investment Need for a technically viable technology for sustainable aquaculture • Aquaculture nowadays focuses on production methods those independent from the influences of external factors • Marine recirculation aquaculture system (RAS) is environmental friendly, free from the external influences and bio-secured.
Project Scope & Objectives • The principle of the module is to utilize excessive nutrients for cultivation of high value marine microalgae • The microalgae are confined in immobilized beads which comprises of immobilized microbes.
Nutrients Nutrients The immobilized microbe utilized excessive nutrients from the marine recirculation system and converted the waste into biomass. The immobilized cells could be harvested and processed to become nutrient supplementary
Objectives • The objectives of the module are: • To remove excessive nutrients from the marine RAS and hence stabilized water quality of the system • To recycle waste from the RAS for production of high value microalgae. • To produce high quality microbes within the immobilized cells
Biological filtration Aeration and oxygenation Ornamental as well as food fish Gas-exchange unit Proposed module culture vessels (fish, shrimp, oyster, etc) waste and solid removal Disinfection System Design & Activities • This module is an add-on module • It does not require re-engineering of the RAS. • The immobilized beads will be installed at the pre-biofiltration The viable cells will be captured inside polymerized capsules and packed in a handling cartridge. The handling cartridge with water driven force for re-suspension of the polymerized capsules maximized total reaction area of the capsules.
Preliminary Results The microbe is able to grow and survive in the polymerized capsules. The microbes utilized excessive nutrients from the water under simulation. Results revealed that the immobilized cell is able to stabilize water quality and production high omega-3 cell. Polymerized capsules with viable cell at day-0. Polymerized capsules with viable cell at day-3
PARTNERSHIP • Underwater World Langkawi is one of the largest marine and fresh water aquaria in South East Asia. The gigantic 15-meter long walk-through tunnel consisting of 500,000 liter seawater is ideal for in-situ assessment of the module for marine ornamental aquaria. • Kembang Subur Sdn. Bhd. is one of the largest shrimp PL (post larvae) suppliers in Malaysia. The 3 hectares hatchery situated at Pantai Berserah, Kuantan provides an ideal testing venue for the add-on module in a food-fish production system.
Financial Needs • Financial supports is needed for pre-protoytpe optimization. • Duration of project: 1 year
Concluding Remarks • Marine recirculation system is one of the potential solutions for sustainable aquaculture. • The add-on module provides not only extra incomes but also diversify the risk of investment in the RAS. • Removal of the excessive nutrients from the marine RAS enable longer water residential time in the system. In other words, less water usage for the system (sustainable usage of water resources). • On top of that, the module also reduces nutrients load from the culture system on the environment.
THANK YOU “ The Earth Charter is important as an expression of the commitment of people throughout the Earth to ensure a sustainable future for those who inhabit the Earth now and those who will follow us on the Earth ... ” Maurice F. Strong