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Use of Clinoptilolite Zeolites for Ammonia-N Transfer and Retention in Integrated Aquaculture Systems and for Improving Pond Water Quality before DischargeNatural zeolites are aluminosilicate minerals found in volcanogenic sedimentary rocks worldwide (Mumpton, 1999). Natural zeolites possess several important properties including adsorption, cation-exchange, dehydration-rehydration, and catalysis. Considerable scientific research in the last few decades has identified broad applications for natural zeolites in construction materials, soil improvements for water and nutrient retention, treatment of water and wastewater for removal of heavy metals and nutrients, dietary supplements for farm-raised animals, health care, and other beneficial uses (Mumpton, 1999).
Appropriate Technology Research 5 (10ATR5)/Experiment/Thailand
Collaborating Institution
Asian Institute of Technology, Thailand
Amrit Bart
Michigan State University
Ted R. Batterson
Donald L. Garling
Christopher F. Knud-Hansen
Objectives
The ultimate goal of this proposed research is to adapt existing technologies using natural clinoptilolite zeolites to provide a more socially acceptable and efficient way to integrate animal manures in pond fertilization, conserve and recycle on-farm resources, and lessen environmental impacts.
Fertilization Efficiency Objectives
- Determine the relationship between ammonia absorption/saturation by clinoptilolite from fresh swine and liquefied chicken manures versus exposure time to the manures.
- Determine the rate of release of ammonia from ammonia-enriched clinoptilolite when used as a nitrogen fertilizer for stimulating natural food production in an outdoor aquaculture system.
- Determine the ability of clinoptilolite to moderate ammonia concentrations in a fertilized outdoor culture system.
Pond Water Discharge Objectives
- Evaluate the effectiveness of clinoptilolite for removing nitrogen and phosphorus from pond discharge.
- Evaluate the potential utility of nutrients reclaimed by clinoptilolite for recycling in pond fertilization.
Natural zeolites are aluminosilicate minerals found in volcanogenic sedimentary rocks worldwide (Mumpton, 1999). Natural zeolites possess several important properties including adsorption, cation-exchange, dehydration-rehydration, and catalysis. Considerable scientific research in the last few decades has identified broad applications for natural zeolites in construction materials, soil improvements for water and nutrient retention, treatment of water and wastewater for removal of heavy metals and nutrients, dietary supplements for farm-raised animals, health care, and other beneficial uses (Mumpton, 1999).
Clinoptilolite zeolites, (Na3K3)(Al6Si 30O72)•24H2O, are one of the 40+ types of naturally existing zeolites. Clinoptilolites possess a cation-exchange capability of about 2.25 meq g-1, and are able to exchange ammonium-N with sodium (Na) and potassium (K) (Mumpton, 1999). One gram of clinoptilolite can take in about 2.2 mg ammonium-N. This cation-exchange capability has been utilized effectively for terrestrial agriculture, where clinoptilolites are first saturated with ammonium-N and then incorporated into crop soils. In this way they act as a slow-release fertilizer, with plants able to extract the sequestered ammonia from the clinoptilolite (Barbarick and Pirela, 1984; Lewis et al., 1984; Dwairi, 1998). Not only does clinoptilolite improve nitrogen fertilization efficiencies, it also reduces nitrate leaching by inhibiting the nitrification of ammonium to nitrate (Perrin et al., 1998). Most of the manure-ammonia sequestered in the zeolite is unavailable to nitrifying bacteria because of the small (4-5 angstrom) pore size of the crystal lattice structure (Mumpton, 1999). Furthermore, clinoptilolites are also used for animal waste management. Clinoptilolites are replacing clays in the cat litter market, and are being used to create an odorless, nitrogen-rich compost from farm livestock manures.
The use of clinoptilolites in aquaculture has focused on ammonia removal for the aquarium industry and freshwater culture systems (Bower and Turner, 1982; Dryden and Weatherley, 1987). The research below, however, proposes an analogous use of clinoptilolite for aquaculture as currently used for terrestrial agriculture and animal waste management: i.e., as a vehicle for ammonia absorption and subsequent fertilization to stimulate algal productivity.
Applying clinoptilolite technologies for livestock-fish integrated systems should improve sustainability by increasing nutrient utilization efficiencies while reducing undesirable farm outputs. Most of the nitrogen entering a farm as animal feeds ends up as ammonia in manure, which is either volatilized creating noxious odors or leached out as nitrate. By capturing this ammonia-N before it gets either volatilized or nitrified, and using that nitrogen to promote algal productivity in ponds, the farmer not only improves the farm environment by reducing noxious odors and nitrate leaching, but recycles an otherwise lost nutrient for increased farm productivity. Incorporating clinoptilolite with fresh animal manures may also improve the social acceptability of integrated aquaculture.
Furthermore, by transferring ammonia from animal manures to clinoptilolite, and then applying the ammonia-enriched clinoptilolite to ponds, the farmer can fertilize ponds with manure-N without adding additional BOD (biochemical oxygen demand). The major environmental risk of adding manure to ponds is the creation of anoxic conditions in the water. Research clearly shows that both algal and fish productivity can be quite high in ponds without the risk of pond water deoxygenation if no additional organic matter is added (Knud-Hansen et al., 1993). Using clinoptilolite to transfer manure ammonia turns animal manure into a source of inorganic nitrogen, and should eliminate associated risks of adding manures to ponds.
Clinoptilolites are also increasingly being used for wastewater treatment (Holman and Hopping, 1980; Ciambelli et al., 1985). For example, 18 municipal wastewater treatment facilities in Brisbane and other cities in Australia use zeolites for ammonia removal and for the flocculation, settling, and removal of phosphates in domestic wastewater (Oláh et al., 1989; Charuckyj, 1997). The research proposed below is a simple application of this existing clinoptilolite technology for cleaning pond water before being discharged into streams and canals. By removing soluble nitrogen and phosphorus before discharge, receiving waters are at less risk of eutrophication. By capturing these nutrients, they can be recycled back into ponds for stimulating algal productivity. Nutrients which would otherwise be lost from the farming system and degrade surrounding environments are instead recycled to increase farm productivity. Furthermore, clinoptilolites are renewable, since regeneration can be simply accomplished through heating or immersion in a salt solution. And since clinoptilolites are natural, inert, do not degrade, and even used in animal feeds (Pond and Yen 1984), they have no associated environmental risks.
Quantified Anticipated Benefits
Anticipated benefits are discussed generally above in the "Significance" section. More specifically, anticipated benefits to the farmer will be:
- Economic savings with reduced need for purchasing additional fertilizers through the retention and recycling of nutrients on farm;
- Improved quality of life with reduction of noxious odors from animal manures;
- Reduced risk of deoxygenation of ponds when integrating animal manures with pond aquaculture; and
- Economic savings if there are legal liabilities associated with downstream impacts from pond water discharges, particularly from intensive aquaculture systems.
- Improved quality of life and social acceptability with the reduction of noxious odors from animal manures and
- Reduced risk of environmental contamination and downstream eutrophication from ammonia volatilization, nutrient leaching, and pond water discharge.
All research will take place at the Asian Institute of Technology (AIT), Thailand, within their Agriculture, Aquatic Systems and Engineering Program. Mr. Yuan Derun, a doctoral student within the graduate program, will be responsible for conducting the research under the direction of Dr. Knud-Hansen. The clinoptilolite to be used in all studies originates from Potosí, Mexico, and has an exchangeable K:Na ratio of about 8:1. Statistical analyses will include Analysis of Variance (ANOVA) for comparison of treatment means, and correlation and regression analyses for identifying relationships. The economic viabilities of the proposed clinoptilolite technologies for rural farming systems will also be evaluated as part of the overall research analysis.
Standard cost-benefit analysis at the farm level: costs include materials, time, labor, alternative sources of pond nutrients (i.e., fertilizers and manures), etc.; benefits include savings on fertilizer costs by recycling nutrients otherwise lost to the farming system, perhaps increased marketability of fish not raised directly on animal manures, etc. Economic analysis will focus on the potential for zeolite technology as applied for rural integrated farms in Thailand. Exact details will develop as the technology evolves through the proposed research.
- Relationship between Clinoptilolite and Ammonia-N Absorption from Animal Manures
- Release of Ammonia from Ammonia-Enriched Clinoptilolite in a Fertilized Pond
Based on the results from the two bench studies described above, an 8-week grow-out experiment will be conducted in 2.5 m x 2.5 m x 1 m outdoor concrete tanks located at AIT. Nile tilapia fingerlings, about 10 g fish-1, will be stocked at 3 fish m-2. There will be a total of 13 treatments, with three replicate tanks (experimental units) per treatment assigned randomly in a completely randomized design. Nine of the treatments will examine the transfer of ammonia-N from zeolite into tank water. There will be three different amounts of clinoptilolite enriched with ammonia from three different sources: swine manure, chicken manure, and concentrated solution of urea. The ammonia-enriched zeolite will be in plastic mesh bags (about 1 kg zeolite/bag), with the three different numbers of bags per treatment. With all of the above nine treatments, bags will be replaced weekly. The actual number and size of bags will be determined based on results from the preliminary bench studies described above.
TSP will be added to all tanks at about 1.0 g TSP-P m-2 wk-1 to provide enough soluble P to prevent P-limitation of algal productivity. The last four treatments will be a dose-response evaluation of clinoptilolite's ability to moderate ammonia concentrations in culture water. One treatment will have no bags of clinoptilolite, while the other three will have increasing numbers of bags. All four treatments will be fertilized with urea at 3.0 g urea-N m-2 wk-1 and 1.0 g TSP-P m-2 wk-1. These fertilization rates correspond to rates established by previous MSU/AIT research found to be very productive without excessive fertilization. The treatment without any bags will serve as the control for the other 12 treatments. Changes in algal biomass will be monitored weekly with a hand-held fluorometer which measures chlorophyll a, net algal productivities will be monitored weekly by diel changes in dissolved oxygen, tilapia growth will be measured at the start and end of the grow-out experiment by length and weight measurements. Mid-afternoon water temperatures, turbidities, and ammonia-N will be monitored weekly in all 39 tanks.
- Reclamation of Nutrients from Pond Water Discharge
Regional Integrations
AIT also has a well-established Training and Consultancy Unit which gives regional workshops on various aspects of aquaculture production systems. The knowledge generated from the proposed research can be readily incorporated into the appropriate workshop(s). There will also be five regional workshops on using pond dynamics to promote sustainable aquaculture included as a separate activity in this proposal. In addition to AIT, the other workshop locations will be at aquaculture research institutes and stations located at Bangladesh, Cambodia, Laos, and Vietnam where AIT and the PD/A CRSP have established formal relationships. Information generated from the above research will be incorporated into these proposed workshops. Strengthening ties between these countries and AIT and the PD/A CRSP is an important component of the Regional Plan For Southeast Asia.
Schedule
All proposed research is scheduled to take place between January and May 2002. Knud-Hansen will make two trips to AIT, of approximately three weeks each (excluding periods away from AIT to give workshops). During the first trip the bench studies on ammonia absorption by clinoptilolite and subsequent release into culture water will take place, and the grow-out study initiated. During the second trip the grow-out study will be completed and the nutrient reclamation study on pond water discharge will be conducted. Final report will be submitted no later than 31 July 2002.
Literature Cited
Barbarick, K.A., and H.J. Pirela, 1984. Agronomic and horticultural uses of zeolites: a review. In: W.G. Pond and F.A. Mumpton (Editors), Zeo-agriculture: Use of Natural Zeolites in Agriculture and Aquaculture. Westview Press, Boulder, Colorado, pp. 93¬103.
Bower, C.E., and D.T. Turner, 1982. Ammonia removal by clinoptilolite in the transport of ornamental fresh-water fishes. Progressive Fish-Culturist, 44(1):19¬23.
Charuckyj, L., 1997. Brisbane water zeoflocc performance report. Zeoflocc process selected by Queensland government. Zeolite Australia Ltd., Brisbane.
Ciambelli, P., P. Corbo, C. Porcelli, and A. Rimoli, 1985. Ammonia removal from wastewater by natural zeolites. I. Ammonium ion exchange properties of an Italian phillipsite tuff. Zeolites, 5(3):184¬187.
Dryden, H.T. and L.R. Weatherley, 1987. Aquaculture water treatment by ion-exchange: I. Capacity of Hector clinoptilolite at 0.01-0.05N. Agricultural Engineering, 6:39¬50.
Dwairi, I.M., 1998. Evaluation of Jordanian zeolite tuff as a controlled slow-release fertilizer for NH4+. Environmental Geology, 34(1):1¬4.
Holman, W.F. and W.D. Hopping, 1980. Treatability of type A zeolite in wastewater, II. Journal of Water Pollution Control Federation, 52:2887¬2905.
Knud-Hansen, C.F., T.R. Batterson, and C.D. McNabb, 1993. The role of chicken manure in the production of Nile tilapia (Oreochromis niloticus). Aquaculture and Fisheries Management, 24:483¬493.
Lewis, M.D., F.D. Moore, 3rd, and K.L. Goldsberry, 1984. Ammonium-exchanged clinoptilolite and granulated clinoptilolite with urea as nitrogen fertilizers. In: W.G. Pond and F.A. Mumpton (Editors), Zeo-agriculture: Use of Natural Zeolites in Agriculture and Aquaculture. Westview Press, Boulder, Colorado, pp. 105¬111.
Mumpton, F.A., 1999. La roca majica: Uses of natural zeolites in agriculture and industry. Proceedings of the National Academy of Science, USA, 96:3463¬3470.
Oláh, J., J. Papp, Á. Mészáros-Kiss, G. Mucsy, and D. Kalló, 1989. Simultaneous separation of suspended solids, ammonium and phosphate ion from wastewater by modified clinoptilolite. Stud. Surf. Sci. Catal., 46:711¬719.
Perrin, T.S., J.L. Boettinger, D.T. Drost, and J.M. Norton, 1998. Decreasing nitrogen leaching from sandy soil with ammonium-loaded clinoptilolite. Journal of Environmental Quality, 27:656¬663.
Pond, W.G., and J.-T. Yen, 1984. Physiological effects of clinoptilolite and synthetic zeolite A in animals. In: W.G. Pond and F.A. Mumpton (Editors), Zeo-agriculture: Use of Natural Zeolites in Agriculture and Aquaculture. Westview Press, Boulder, Colorado, pp. 127¬142.
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