Two series of the experiment
were conducted and all treatments were replicated to ensure their consistency. In the first series, the wastewatersludge
ratios covered 1:1 (with sodium bi-carbonate addition), 1:1, 1:2 and 2:1. It was found that the ratios have a
strong effect on the biogas production and the ratio of 1:2 gave the highest biogas producing efficiency followed
by the ratio 1:1 (with sodium bi-carbonate addition). At 1:1 ratio, sodium bi-carbonate addition was required to
start anaerobic digestion at a workable pH range whereas at 1:2 ratio the initial pH is in the workable range
without the need of its addition. However, at the ratio of 2:1 the starting pH was too low to adjust pH
economically by adding sodium bi-carbonate. The second series was to confine experiments to a narrower ratio
range, namely: 1:1 (with sodium bi-carbonate addition), 1:1.5, 1:2, 1:2.5. In both sets of experiment, the ratio 1:2
gave the best biogas production potential of 76.62 and 78.52 ml of biogas/g COD removed respectively. In all
treatments, the process was able to remove more than 80% of wastewater initial COD.
Two series of the experimentwere conducted and all treatments were replicated to ensure their consistency. In the first series, the wastewatersludgeratios covered 1:1 (with sodium bi-carbonate addition), 1:1, 1:2 and 2:1. It was found that the ratios have astrong effect on the biogas production and the ratio of 1:2 gave the highest biogas producing efficiency followedby the ratio 1:1 (with sodium bi-carbonate addition). At 1:1 ratio, sodium bi-carbonate addition was required tostart anaerobic digestion at a workable pH range whereas at 1:2 ratio the initial pH is in the workable rangewithout the need of its addition. However, at the ratio of 2:1 the starting pH was too low to adjust pHeconomically by adding sodium bi-carbonate. The second series was to confine experiments to a narrower ratiorange, namely: 1:1 (with sodium bi-carbonate addition), 1:1.5, 1:2, 1:2.5. In both sets of experiment, the ratio 1:2gave the best biogas production potential of 76.62 and 78.52 ml of biogas/g COD removed respectively. In alltreatments, the process was able to remove more than 80% of wastewater initial COD.
การแปล กรุณารอสักครู่..
![](//thimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)