Zero-Waste Approach: Assessment of Aluminum-Based Waste as a Photocatalyst for Industrial Wastewater Treatment Ecology

Abstract

Alum sludge (AS) is produced in inevitable amounts from drinking water treatment plants. Also, dye-contaminating wastewater is usually discharged from textile industries that must be treated to meet the environmental authorities; thus, Fenton’s reagent is a suitable candidate. However, reducing the quantity of chemicals used in Fenton reactions can be partly achieved by an industrial ecology approach. This paper is introducing alum sludge waste as a photocatalyst, (termed as AS-Fenton), that is prepared under mild experimental conditions. Thermogravimetric and differential thermogravimetric analyses were conducted to attain full illustrations of the thermal treatment steps. Its chemical composition and morphology is revealed using X-Ray Diffraction and Scanning Electron Microscope. Thus, this research is of great significance for the application of a waste by-product for being a Fenton source for photocatalytic removal of Levafix Blue dye effluent. A new modified Fenton reagent was applied with the addition of 1.0 g/L and 800 mg/L of catalyst and H2O2, respectively, at pH 3.0 shows high potential for the dye removal. The starting concentration of the Levafix Blue CA was halved during the first 5 min under the UV illumination. The most effective operating variables are optimized through Response Surface Methodology. The kinetics of the dye removal was investigated and the reaction following the pseudo-first-order regime with the kinetic constant (KF), ranged in 0.04–0.57 min−1. Thermodynamic parameters reveal that the reaction is a non-spontaneous and endothermic in nature. Hence, toxicity of the dye is significantly reduced via Fenton reaction to non-toxic end products.

Construction of a hetero-junction recyclable composite photocatalyst from aluminum-based waste/magnetite for efficient carbamate insecticide oxidation

“…But with a further increase in the catalyst dose to 120 mg L −1 , a marginal decrease in the removal rate was attained. Such investigation of the enhancement in the oxidation rate with catalyst dose up to a certain limit 64 is in accordance with previous findings in the literature 6 in treating methylene blue dye with such a reagent.…”

Optimization of purity and yield of amorphous bio‐silica nanoparticles synthesized from bamboo leaves

“…This is supported by the value of R 2 being above 0.8, which is the minimum value to accept a consistent experimental model. [55,60] Therefore, the product yield is implicitly dependent on all single variables.…”

MES System Based on Industrial Ecology in Energy Measurement Management

“…In most energy consumption enterprises, manual meter reading is still very common. The main deficiencies are: first, manpower waste, many enterprises large production area, plant, energy consumption equipment, usually each factory needs 2-3 professional meter reader, considering the production process of enterprises is generally 24 hours and has 8-10 factories, manpower demand is very large; second, affect the accuracy of data statistics, manual meter reading will inevitably appear data misreading, copying or even data loss; three, data is difficult to save, read, the old manual meter reading lacks intelligent information technology [6][7].…”