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Adsorptive Optimization of Abamectin from Aqueous Solutions by Immobilized Eichhornia crassipes

Shihab Mohammed Salim, Ismail Hanan Haqi, Ibrahem Abdullah Ismail

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 10

150--157

Adsorption techniques are frequently used to eliminate particular forms of pesticides. This work aimed to describe the process of adsorbing abamectin (ABM) from aqueous systems onto adsorbents and some factors affecting the process effectiveness. Eichhornia crassipes, also known as water hyacinth (WH), was chemically processed utilizing calcium alginate-immobilized WH and sodium alginate as adsorbent. The response surface method (RSM) was implemented to enhance the operational aspects of the adsorption procedure on the removal of ABM residues from aqueous solution. The results show that 95.65% of the abamectin was removed under the optimum conditions of pH = 3, 1000 mg/L of immobilized WH, particle size = 5 µm, shaking speed = 200 rpm, and 30 mg/L of ABM concentration throughout 180 min contact time. The model’s predicted response results also show a decent agreement with the experimental data (R2 = 86.64%), proving the effectiveness of this approach for developing precise predictions. The responses were assessed using a second-order polynomial multiple regression model, which confirmed a successful adjustment with the obtained data using analysis of variance (R2 = 92.0%, R2 adj = 88.92%, and R2 pred = 82.92%). In conclusion, the results demonstrated the potential application and beneficial adsorption effectiveness of WH in removal of the pesticides from an aqueous solution.

Reducing Volatile Organic Compound Emissions Using Biotrickling Filters and Bioscrubber Systems

Shihab Mohammed Salim, Mhemid Rasha Khalid Sabri, Saeed Liqaa I., Ismail Hanan Haqi, Alp Kadir

Journal of Ecological Engineering

2022

Vol. 23, nr 10

255--268

A comparative study was conducted for differentiating between attached and suspended growth, represented by a lab-scale biotrickling filter and bio-scrubber under anoxic conditions, respectively. However, malodorous ethanethiol gas (ET) that was categorized as one of the volatile organic sulfur compounds (VOSCs) was studied using a variety of settings and parameters. In contrast, NO3− can be used as an electron acceptor in the bioconversion of ET gas to elemental sulfur and/or sulfate when no oxygen is available. Empty bed residence times (EBRTs), gas to liquid ratios (G/Ls) (40, 60, 80, 100, 150), and inlet concentrations (150, 300, 800, and 1500 mg/m3) were all investigated in relation to ET removal efficiency (RE) (30, 60, 90, and 120 s). While the G/L ratio of 80 resulted in efficient ET removal (more than 90.8% for 150 mg/m3 of inlet concentration), it could only achieve the extraction of 80.6% for 1500 mg/m3 of inlet concentration at a fixed EBRT of 60 s. These results were based on the performance of a lab-scale anoxic biotrickling filter. Even though mass transfer constraints and poor solubility of ET were factors, the performance of the biotrickling filter under anoxic settings was superior to that of the bioscrubber and improved the low oxidation rates of ET.