CD Skripsi
Penyisihan Cod Dan Amonia Dari Limbah Cair Domestik Menggunakan Microalgalbacterial Granular Sludge (Mbgs) Dengan Variasi Konsentrasi Mikroalga
ABSTRACT
The rate of population growth in Indonesia every year is categorized as
high, this causes a greater need for the use of water consumption which is in line
with the amount of domestic wastewater produced. Domestic wastewater contains
high organic matter, so it can reduce water quality if it is directly discharged into
water bodies without prior treatment. One alternative treatment used to treat
domestic wastewater is using Microalgal-Bacterial Granular Sludge (MBGS).
MBGS has advantages compared to other alternative treatments, namely having a
dense and compact microbial structure, capable of simultaneously degrade
pollutants with high COD and ammonia loads, ability to withstand good levels of
shock loading, and short hydraulic residence times. This study aims to study the
effect of variations in the concentration of microalgae Chlorella sp. in MBGS on
the reduction of COD and ammonia in domestic wastewater using a
Photobioreator. This study used 3 ratio variations (MA/AS), namely PBR 1 (2:5),
PBR 2 (3:5), PBR 3 (4:5) and Control (Activated Sludge). During the 23 days of
the experimental period, MBGS was formed at PBR 1 (2:5) with a granular
diameter of 0.88-1 mm, VSS of 6.2 g/L, SVI5 of 31 mL/g, and high COD and
ammonia removal efficiencies of 98% and 94%. Meanwhile, in PBR 2 and 3 no
MBGS was formed. This is due to the fact that the nutrient content in the liquid
waste is not sufficient to sustain the two types of microorganisms growing
together if the concentration ratio between microalgae and bacteria is equally
high, as well as the high intensity of light from direct sunlight which interferes
with the growth of bacteria.
Keywords: Microalgal-Bacterial Granular Sludge (MBGS), Chlorella sp.,
domestic wastewater, pollutant removal, photobioreactor
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