Sludge Production and Management for Recirculating Aquacultural Systems
Tóm tắt
Waste discharge from recirculating aquacultural systems is typically in the form of sludge composed of partially stabilized excreta, uneaten food particles, and bacterial growth. The amount of solids produced can be estimated using an equation presented in this paper. In a typical recirculating system, total suspended solids (TSS) is the major pollutant of the sludge produced. The production of TSS ranges from 10 to 30% of the feeding rate on a dry weight basis. The ratio of 5‐d biochemical oxygen demand to total suspended solids (BODS/TSS) of the sludge ranges from 0.10 to 0.2, the total Kjeldahl nitrogen (TKN) content of the TSS ranges from 4 to 6%, and total phosphorus ranges from 0.2 to 2%.
The nature of the waste and the economics of the treatment processes dictate the disposal of aquacultural sludge. Effective clarification of aquacultural waste is critical in reducing sludge volume. Using lagoons for stabilization and storage is the most practical option. While direct disposal by land application seems feasible for rural areas with dry climates, additional stabilization/storage in a lagoon with eventual disposal through land application seems most feasible for a variety of conditions. The effluent produced from the sludge treatment processes can be used for irrigation or for direct discharge after further polishing (treatment).
Từ khóa
Tài liệu tham khảo
APHA (American Public Health Association)., 1989, Standard methods for the examination of water and wastewater
Brune D. E., 1991, Engineering aspects of intensive aquaculture, 118
Chen S., 1991, Sludge management for recirculating aquaculture systems. Workshop on Design of High Density Recirculating Aquaculture Systems
Chen S., 1993, Techniques for modern aquaculture. Proceedings of an Aquacultural Engineering Conference, 21–23 June 1993, 16
Chen S., 1996, Proceedings from the Conference “Successes and Failures in Commercial Recirculating Aquaculture,” July 19–21, 421
Chen S., 1994, Engineering design and management of aquaculture water reuse systems, 61
Chudoba J., 1985, Production, degradation, and composition of activated sludge in aeration systems without primary sedimentation, Journal of Water Pollution Control Federation, 57, 201
Coffin D. E.1993.Impact of solids retention time on sludge production from low density media expandable granular biofilters.Master's thesis.Department of Civil and Environmental Engineering Louisiana State University Baton Rouge Louisiana USA .
Silva S. S., 1994, Fish nutrition in aquaculture
EPA., 1975, Process design manual for suspended solids removal. U.S. EPA technology transfer publication
Gordon J. A., 1974, Water characterization studies for high‐density raceway production of catfish‐The Galatin Project
Hammer M. J., 1996, Water and wastewater technology
Hochheimer J. N., 1991, Proceedings from the Aquaculture Symposium, Cornell University, Ithaca, New York, 4–6 April 1991, 57
Hopkins T. A., 1989, Feed conversion, waste and sustainable aquaculture, the fate of the feed, Aquaculture Magazine, 15, 32
Idaho DEQ (Division of Environmental Quality)., 1995, Idaho waste management guidelines for aquaculture operations (draft)
Kugelman I. J., 1991, Proceedings from the Aquaculture Symposium, Cornell University, Ithaca, New York, 4–6 April 1991, 80
Loehr R. C., 1974, Agricultural waste management: Problems, processes, and approaches
Losordo T. M., 1991, Engineering aspects of intensive aquaculture. Proceedings from the Aquacultural Symposium. Cornell University, Ithaca, New York, 4–6 April, 1991, 32
MacMillan R., 1992, National livestock, poultry and aquaculture waste management, 185
Malone R. F., 1988, Design of recirculating soft crawfish shedding systems
McLaughlin T. W., 1981, Bio‐engineering symposium for fish culture, 167
Metcalf and Eddy, Inc., 1991, Wastewater engineering, treatment/disposal/reuse
Middlebrooks E. J., 1982, Wastewater stabilization lagoon design, performance and upgrading
Mudrak V. A., 1981, Bio‐engineering symposium for fish culture
Ning Z.1996.Characteristics and digestibility of aquacultural sludge.Master's thesis.Department of Civil and Environmental Engineering Louisiana State University Baton Rouge Louisiana USA .
NRCS (Natural Resources Conservation Services)., 1992, Agricultural waste management field handbook. Natural Resources Conservation Services
Olson G. L., 1992, National livestock, poultry and aquaculture waste management, Proceedings of the National Workshop, July 29–31,1991, Kansas City, Missouri. American Society of Agriculture Engineers, St, 198
Overcash M. R., 1983, Livestock waste management
Overcash M. R., 1983, Livestock waste management
Page J. W., 1974, Chemical composition of effluents from high density culture of channel catfish, Water, Air and Soil Pollution, 3, 365, 10.1007/BF00226467
Pillay T. V. R., 1992, Aquaculture and the environment
Poon C. P. C., 1986, Handbook of environmental engineering,, 305
Reynolds T. D., 1995, Unit operations and processes in environmental engineering
Sims J. T., 1995, Animal waste and the land‐water interface
Smith R. R., 1989, Fish nutrition, 1
Stewart J. E., 1997, Environmental impacts of aquaculture, World Aquaculture, 28, 47
Westerman P. W., 1993, Techniques for modern Aquaculture, 35
Weston D. P., 1996, Principle of salmonid culture
Wimberly D. M.1990.Development and evaluation of a low‐density media biofiltration unit for use in recirculating fish culture systems.Master's thesis.Louisiana State University Baton Rouge Louisiana USA .