Development of aerobic granular sludge using industrial latex wastewater
An attempt of developing aerobic granules using industrial latex wastewater sludge was conducted. Optimization of cycling time were investigated and assessment of the effect of fluctuating organic loading was performed. Subsequently followed by investigation of physical characteristics of a stable a...
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| Format: | Thesis |
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| Language: | English |
| Subjects: | |
| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78182/5/Page%201-24%20%28Najihah%29.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78182/2/Full%20text.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78182/3/Declaration%20Form.pdf |
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| Summary: | An attempt of developing aerobic granules using industrial latex wastewater sludge was conducted. Optimization of cycling time were investigated and assessment of the effect of fluctuating organic loading was performed. Subsequently followed by investigation of physical characteristics of a stable aerobic granules under inconsistent and constant organic loading. Finally, aerobic granular sludge produced was then characterized by a height to diameter ratio (H/D) of 2.7 and 14. Experimental
investigation was conducted in sequencing batch reactors R1, R2, R3 and R4 with
cycling time of 4 hours after selection of cycling time was conducted based on
preliminary investigation. Four batches of experiment were performed to support the
objectives of this study. Similar size of sludge flocs was inoculated to all four reactors
with reactor configuration of 2.7 and 14 together with various organic loading rate. R1
and R3 was introduced to real latex wastewater with varying chemical oxygen demand
(COD) loadings from as low as 0.01 to 0.28 kgCOD/m3/d. However, granules in R1
were cultivated with superficial air velocity (SAV) of 4.25 cm/s, whereas granules R3
utilized SAV of 1.1 cm/s. R2 and R4 was fed with synthetic wastewater with consistent
COD loadings of 0.07 kgCOD/m3/d but with different application of SAV. All four
reactors achieve granulation, although granules developed in R1 and R3 is bigger and
denser than in R2 and R4. But when compared to granules grown in R1 and R3, R2 and
R4 granules were less compact and smaller in size. R2 and R4 granules can reach
granule size of 0.2 to 0.6 mm within 210 days, compared to R1 and R3 granules that can
only developed up to 4.75 mm within 150 days. This result shows significant difference
between R1 and R3 with R2 and R4 granules, and that COD loadings appear to be a
crucial factor for complete granulation. When R1 granules were compared to granules
in R3, an apparent difference of granules characteristics were observed with a high
average settling velocity (SV) value in R3 than in R1. On the other hand, R2 and R4,
displayed unstable development of granules throughout the study but stable reactor
performance after formation of granules. Utilization of a constantly low organic loading
rate (OLR) does not seem to favour a stable granules formation, although high height to
diameter ratio was applied to enhance the SAV within the reactor in order to intensify
shear force optimizing the formation of a more stable and compact granules. |
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