Ha, Thi Quyen and Le, Thi Minh Thanh
(2020)
Using cassava waste of the cassava starch processing as food for raising African Nightcrawler (Eudrilus eugeniae) to obtain vermicomposting and earthworm biomass.
Journal of Vietnammese Environment, 12
(2).
pp. 169-176.
ISSN 2193-6471
Abstract
The raising earthworms by cassava waste is a useful solution to reduce environmental pollution caused by cassava starch
processing. In this study, cassava waste (including cassava peel, cassava pieces and soil) was used as a food source for
raising African Nightcrawler (Eudrilus eugeniae) with experiments as follows: Experiment 1: earthworms were raised in
crushed cassava waste right after being discharged; Experiment 2: earthworms raised in crushed cassava waste that had
been incubated with organic matter decomposing microbiological preparation for the previous two weeks; Experiment 3:
earthworms were raised in crushed cassava waste that had self-decomposed naturally for the previous two weeks. The
cassava waste was decomposed naturally for 4 weeks for the control. Besides, the crushed cassava waste was also
incubated by organic matter decomposing microbiological preparation for 4 weeks for getting more data for comparison
between experiments (Experiments 4). The experiments were followed for 4 weeks. The results showed that the content of
organic matter, humic acid and total nitrogen in organic cassava humus obtaining from experiments increased comparing
to the control: total organic matter content reached from 10.4%-15.7%, higher than the control (8.2%) from 1.27-1.92
times, humic acid content reached 0.6 - 0.8% and total nitrogen reached 0.3%. In which, the experiment 3 had the highest
quality of humus (organic matter content 15.7%, total nitrogen 0.3%, humic acid 0.7% and fulvic acid 0.5%). The
experiment 3 also had the highest earthworm biomass (3.6kg), increasing 30.5% comparing to experiment 1 and 19.4%
comparing to experiment 2. Therefore, experiment 3 was proposed for application in treatment of cassava waste in larger
scale. The organic humus obtaining from raising earthworms by cassava waste can be used as raw materials for producing
vermicompost. The earthworm biomass can be used as protein rich food for domestic animals (such as chicken, tortoise,
eel, fish...) or used as nutritious fertilizer.
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