Open AccessEffect of Digestate from Rubber Processing Effluent on Soil Properties
Author(s) -
Muniratu Maliki,
Ikhazuagbe H. Ifijen,
Mulu Emmanuel Khan
Publication year - 2021
Publication title -
uganda journal of agricultural sciences
Language(s) - English
Resource type - Journals
eISSN - 2410-6909
pISSN - 1026-0919
DOI - 10.4314/ujas.v19i2.3
Subject(s) - digestate , effluent , amendment , biogas , anaerobic digestion , environmental science , soil fertility , soil water , pulp and paper industry , soil conditioner , soil test , chemistry , agronomy , waste management , environmental engineering , soil science , methane , biology , political science , law , organic chemistry , engineering
Anaerobic digestion of rubber processing effluent (RPE) was conducted at 1:1 Effluent to Inoculums ratio to obtain biogas at a 40–day retention time. The physicochemical properties of the RPE were determined before and after anaerobic digestion. Digestate obtained thereof was used as soil amendment to investigate its bio-fertility potential. To study the effects, three kilograms (3Kg) of soil samples were separately treated with 0, 200, 400, 600 of the digested RPE. The effluent applied were thoroughly mixed with the soil, watered regularly and left for eight weeks for adequate mineralisation and equilibration. The soil physicochemical properties were determined before and after the amendment. The results from the amended soils showed that application of the digestate enhanced soil quality (as soil organic carbon, N, P, K, Ca, Na and % base saturation were significantly higher than in the control). However, the soil pH remained in the acidic region and the soil exchangeable acidity reduced.
Keywords: Digestate, soil properties, biogas, RPE.