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 20–30°C. 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.
Integrated mechanical, biological and physico-chemical treatment of liquid manure streams
S. Kalyuzhnyi, V. Sklyar, J. Rodriguez-Martinez, I. Archipchenko, I. Barboulina, O. Orlova, A. Epov, V. Nekrasova, A. Nozhevnikova, A. Kovalev, P. Derikx, A. Klapwijk; Integrated mechanical, biological and physico-chemical treatment of liquid manure streams. Water Sci Technol 1 June 2000; 41 (12): 175–182. doi: https://doi.org/10.2166/wst.2000.0266
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