Integrated mechanical, biological and physico-chemical treatment of liquid manure streamsстатья

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[1] Integrated mechanical, biological and physico-chemical treatment of liquid manure streams / S. a. Kalyuzhnyi, V. a. Sklyar, J. a. Rodriguez-Martinez et al. // Water science and technology. — 2000. — Vol. 41, no. 12. — P. 175–182. The results obtained during the first year of execution of a joint Russian-Dutch project.’The development of integrated anaerobic-aerobic treatment of liquid manure streams with maximisation of production of valuable by-products (fertilisers, biogas) and re-utilisation of water’ (1999-2001) are discussed. The application of a straw filter was an effective means to separate the solid and liquid fractions of diluted pig manure wastewater and resulted in the removal of a significant part of the dry matter, total nitrogen and phosphorus (65, 27 and 32%, respectively). From the filtrate generated, 60-80 % of the COD was removed in a UASB reactor operating at 20-30oC. Up to 66% of phosphate was precipitated after air stripping of the CO2 from the anaerobic effluents. Ammonia was efficiently removed (>99%) from the anaerobic effluents using zeolite (ural laumantite) as an ion exchanger. However, the N-content of the resulting zeolite was too low to be used as a fertiliser. A feasible alternative for nitrogen elimination involved nitrification of the anaerobic effluent followed by denitrification in a UASB reactor using the COD of the filtrated manure wastewater as carbon source. The results obtained during the first year of execution of a joint Russian-Dutch project ‘The development of integrated anaerobic-aerobic treatment of liquid manure streams with maximization of production of valuable by-products (fertilizers, biogas) and re-utilization of water’ (1999-2001) are discussed. The application of a straw filter was an effective means to separate the solid and liquid fractions of diluted pig manure wastewater and resulted in the removal of a significant part of the dry matter, total nitrogen and phosphorus (65, 27 and 32%, respectively). From the filtrate generated, 60-80% of the COD was removed in a UASB reactor operating at 20-30 oC. Up to 66% of phosphate was precipitated after air stripping of the CO2 from the anaerobic effluents. Ammonia was efficiently removed (>99%) from the anaerobic effluents using zeolite (Ural laumantite) as an ion exchanger. However, the N-content of the resulting zeolite was too low to be used as a fertilizer. A feasible alternative for nitrogen elimination involved nitrification of the anaerobic effluent followed by denitrification in a UASB reactor using the COD of the filtrated manure wastewater as carbon source. Data are presented from the first year of operation of an integrated anaerobic-aerobic treatment system for treating liquid manure streams. The joint Russian-Dutch project was aimed at maximizing the production of valuable byproducts and the re-utilization of water. Data are presented on the operation of a straw filter for separating the solid and liquid fractions, COD elimination using an upflow anaerobic sludge-blanket reactor, the performance of a zeolite to remove ammonia from the anaerobic effluents, nutrient precipitation from the anaerobic effluents, start-up of a nitrifying biofilter to treat the anaerobic effluents, and denitrification of the aerobic effluents in an upflow anaerobic sludge-blanket reactor. The data show that NH3 was efficiently removed, and up to 66% of phosphate was precipitated from the anaerobic effluents using air stripping. (from Netherlands Biotechnol Soc/et al 4th Int Symp on Environ Biotechnology, Noordwijkerhout (Apr 10-12, 00)).

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