scholarly journals Investigation of the growth of Chlorella vulgaris and Chlamydomonas reinhardtii cultivated in pre-treated palm oil mill effluent (POME) as the culture medium

2021 ◽  
Vol 945 (1) ◽  
pp. 012077
Author(s):  
Y K Phang ◽  
L-H Tey ◽  
M Aminuzzaman ◽  
M Akhtaruzzaman ◽  
A Watanabe
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Palm Oil ◽  
Chlorella Vulgaris ◽  
Culture Medium ◽  
Environmental Changes ◽  
Light Condition ◽  
Post Treatment ◽  
Palm Oil Mill Effluent ◽  
Lag Phase ◽  
Palm Oil Mill

Abstract The application of microalgae in wastewater treatment has attracted the attention of researchers since a few decades ago. Palm oil industry is one of the lucrative main exporting industry in Malaysia which has drawn the attention of researchers in mitigating the polluting impacts caused by the palm oil mill effluent (POME) released from the oil palm processing. In this study, the growth of the green algae Chlorella vulgaris and Chlamydomonas reinhardtii in the pre-treated POME was studied for 7 continuous days. The number of microalgae cells, chlorophylls and carotenoids contents were monitored throughout the cultivation period. The potential of both strains of microalgae as the water polisher for post-treatment of POME was investigated as well. The findings revealed that both microalgae showed lag phase at the beginning of cultivation and grew exponentially later. When monitoring the chlorophyll content, chlorophyll a and chlorophyll b played a role in photosynthesis when the microalgae detected environmental changes. The carotenoids in the microalgae acted as the accessory pigments which assisted in light harvesting under poor light condition and as the antioxidant protecting the cells when there was excess light. C. vulgaris was able to remove 98.1 % of phosphate and 53.1 % of ammoniacal nitrogen while C. reinhardtii removed 90.1 % and 37.3 %, respectively. This study indicated that two microalgae species have a high potential to be integrated in the post-treatment for POME.

scholarly journals Aerobic Post-treatment of Different Anaerobically Digested Palm Oil Mill Effluent (POME)

2016 ◽  
Vol 7 (7) ◽  
pp. 511-515 ◽  
Author(s):  
Kian Weng Chou ◽  
◽  
Siew Wei Tan ◽  
Norhashimah Morad ◽  
Teng Tjoon Tow ◽  
...  
Keyword(s):  
Palm Oil ◽  
Post Treatment ◽  
Palm Oil Mill Effluent ◽  
Palm Oil Mill

Post-Treatment of Anaerobically Digested Palm Oil Mill Effluent by Polymeric Flocculant-Assisted Coagulation

2014 ◽  
Vol 567 ◽  
pp. 116-121 ◽  
Author(s):  
Amirhossein Malakahmad ◽  
Sim Yeong Chuan ◽  
Mahdieh Eisakhani
Keyword(s):  
Palm Oil ◽  
Post Treatment ◽  
Palm Oil Mill Effluent ◽  
Optimum Conditions ◽  
Rapid Mixing ◽  
Coagulation Process ◽  
Effluent Discharge ◽  
Palm Oil Mill ◽  
Slow Mixing ◽  
Flocculation Process

Typically, palm oil mill industries use conventional anaerobic ponds for treatment of palm oil mill effluent (POME). But, this method alone cannot produce effluent discharge to an allowable limits set by the authorities. This study aimed to investigate further treatment of anaerobically digested POME (COD = 682±14 mgL-1, TSS = 29±7 mgL-1 and turbidity = 106±3 NTU) by coagulation-flocculation process. Alum, an industrial-accepted coagulant and OC 100 and PC 100W as two industrial-based polymeric flocculants were used in coagulation-flocculation process. Results indicate coagulation process in its optimum conditions (pH = 6, alum dosage = 1800 mgL-1, rapid mixing = 5 min, and slow mixing = 20 min) reduces the COD, TSS and turbidity by 59%, 80% and 86%, respectively. Flocculants OC 100 and PC 100W caused further reduction of TSS (85–88%) and turbidity (97–98%). By application of post treatment, the POME characteristics reached to an acceptable discharge level enforced by Malaysian department of environment (DOE).

Post-treatment of palm oil mill effluent (POME) using combined persulphate with hydrogen peroxide (S2O82−/H2O2) oxidation

2016 ◽  
Vol 74 (11) ◽  
pp. 2675-2682 ◽  
Author(s):  
Chia Ken Lin ◽  
Mohammed J. K. Bashir ◽  
Salem S. Abu Amr ◽  
Lan Ching Sim
Keyword(s):  
Hydrogen Peroxide ◽  
Palm Oil ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Post Treatment ◽  
Palm Oil Mill Effluent ◽  
Operation Conditions ◽  
H2o2 Oxidation ◽  
Palm Oil Mill ◽  
First Time

The aim of the current study is to evaluate the effectiveness of combined persulphate with hydrogen peroxide (S2O82−/H2O2) oxidation as a post-treatment of biologically treated palm oil mill effluent (POME) for the first time in the literature. The removal efficiencies of chemical oxygen demand (COD), ammoniacal nitrogen (NH3-N), and suspended solids (SS) were 36.8%, 47.6%, and 90.6%, respectively, by S2O82− oxidation alone under certain operation conditions (i.e., S2O82− = 0.82 g, pH 11, and contact time 20 min). Nevertheless, the combined process (S2O82−/H2O2) achieved 75.8% and 87.1% removals of NH3-N and SS, respectively, under 2.45/1.63 g/g H2O2/S2O82−, pH 11, and 20 min oxidation. Moreover, 56.9% of COD was removed at pH 8.4.

MODELING OF BATCH AND CONTINUOUS ANAEROBIC DIGESTION OF PALM OIL MILL EFFLUENT: THE EFFECT OF WASTEWATER-SLUDGE RATIO

2016 ◽  
Vol 78 (5-6) ◽  
Author(s):  
Hathaikarn Thongpan ◽  
Rachadaporn Thongnan ◽  
Nirattisai Rakmak ◽  
Chairat Siripatana
Keyword(s):  
Anaerobic Digestion ◽  
Palm Oil ◽  
Production Efficiency ◽  
Biogas Production ◽  
Wastewater Sludge ◽  
Palm Oil Mill Effluent ◽  
Lag Phase ◽  
Type Model ◽  
Initial Ph ◽  
Palm Oil Mill

In this work, both models for batch and continuous anaerobic digestion of palm oil mill effluent were developed based on Monod’s kinetics. Then the authors attempt to understand the effect of wastewater-sludge (WW:S) ratio on the biogas production efficiency in batch digesters. The experiments were carried out at a controlled temperature of 35±0.5 °C. Two series of the experiment were conducted. In the first series, the wastewater-sludge ratios covered 1:1 (add sodium bi-carbonate), 1:1, 1:2 and 2:1. It was found that the ratio of 1:2 gave the highest biogas producing efficiency followed by the ratio 1:1 (add sodium bi-carbonate). 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 (add sodium bi-carbonate), 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. The modified Gompertz equation was used to estimate the maximum specific biogas production rate (MBPR or Rm/S0). It was also found that the ratio of 1:2 gave the best MBPR in both experimental series (26.87 ml biogas/g COD-day). A modified Monod-type Model was also developed to describe the microbial growth, substrate consumption and biogas production in continuous operation. In general, sludge recycle provided active biomass which can use the substrate in the wastewater instantly without significant lag phase or delay. Furthermore, continuous-flow model developed, with parameters estimated from batch experiments, predicted the experimental kinetics of the actual continuous experiments satisfactory.  

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