PROCESS OF MANUFACTURING ORGANIC FERTILIZER FROM WASTE WATER SEDIMENT (VARIANTS) Russian patent published in 2007 - IPC C05F7/00 

FIELD: environmental biotechnology.

SUBSTANCE: invention is directed to utilize waste water sediment with low heavy metal content in combination with brewing trade wastes (brewing grain) to produce low-cost organic fertilizer. Process of manufacturing organic fertilizer according to first variant comprises enrichment of 3 year-old mineralized waste water sediment by mixing it mechanically with organic component, namely brewing grain, at volume ratio (0.7-0.3):(0.3-0.7), respectively. Second variant comprises mixing relatively fresh (stored for less than 3 years) dehydrated waste water sediment with carbon-containing moisture-absorbing component (wood sawdust or peat) followed by aerobic composting of resulting mix. In this variant, brewing grain is additionally added to mix at volume ratio sediment/grain/sawdust (or peat) 0.5:0.25:0.25 or 0.6:0.3:0.1. Thus prepared compost is allowed to partially dry in air. Third variant mixing relatively fresh waste water sediment with carbon-containing moisture-absorbing component followed by aerobic composting in presence of additionally added brewing grain at volume ratio sediment/grain/sawdust (or peat) 0.5:0.25:0.25 or 0.6:0.3:0.1. Composting is initiated by bioactivator added in amount at least 15% of the volume of mix being composted and composting is followed by partial drying in air. Fourth variant involves relatively fresh waste water sediment mixed with brewing grain or sawdust, or peat at volume ratio 0.5:0.5 or 0.6:0.4 and addition of bioactivator in amount at least 15% of volume of the mix followed by partial drying in air.

EFFECT: accelerated formation of fertilizer with elevated content of organics.

4 cl, 3 tbl, 12 ex