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- Title
RECYCLING OF SEWAGE PHOSPHOROUS THROUGH AZOLLA CULTIVATION FOR BIOFEED AND BIOFERTILIZER.
- Authors
Padmavathy, P.; Manimaran, Baskaran; Srinivasan, A.; Manimekalai, D.
- Abstract
Physico-chemical characteristics of sewage has been studied, the same is aerated and utilized as phosphorus source in mass cultivation of azolla. Mass cultivation experiments have been conducted both in the fodder plot and cement cisterns. Azolla double its mass once in four days. The estimated rate of removal of phosphate was 0.62mg PO4/g wt./day. A biomass production of 600-650kg / 1000m2/week have been documented with a phosphorus input - nitrogen output ratio of 1:4. Such sewage cultivated azolla was further recycled as biofertilizer in fish ponds and as cheap protein source in fish feed. 1 ton of azolla is able to provide 2.5 kg of nitrogen and 625 g phosphorus to fish pond. Compounded fish feed of 40% protein was prepared using dried azolla powder (27% protein). Feed trials were conducted using common carp Ciprinus carpio and the recorded gross growth efficiency (5.8) and net growth efficiency (6.9) affirmed the food value of azolla as component of fish feed.
- Subjects
PHOSPHOROUS acid; AZOLLA; BIOFERTILIZERS; SEWAGE purification; NITROGEN
- Publication
Biochemical & Cellular Archives, 2017, Vol 17, Issue 2, p745
- ISSN
0972-5075
- Publication type
Article