Use of Acorn Leaves as a Natural Coagulant in a Drinking Water Treatment Plant

Water

Francesco Pirozzi¹  Abderrezzaq Benalia²  Kerroum Derbal³  Antonio Panico⁴ 

[1] Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, 80125 Naples, Italy;Laboratory LIPE, Faculty Process Engineering, University of Constantine 3, Ali Mendjeli Nouvelle Ville, 25000 Constantine, Algeria;National Polytechnic School of Constantine, Ali Mendjeli Nouvelle Ville, 25000 Constantine, Algeria;Telematic University Pegaso, 80148 Naples, Italy;

关键词: acorn leaves;    coagulant extraction;    drinking water;    natural coagulant;    solvent;    turbidity;   

DOI  :  10.3390/w11010057

来源: DOAJ

【 摘 要 】

In this study, the use of acorn leaves as a natural coagulant to reduce raw water turbidity and globally improve drinking water quality was investigated. The raw water was collected from a drinking water treatment plant located in Mila (Algeria) with an initial turbidity of 13.0 ± 0.1 NTU. To obtain acorn leaf powder as a coagulant, the acorn leaves were previously cleaned, washed with tap water, dried, ground and then finely sieved. To improve the coagulant activity and, consequently, the turbidity removal efficiency, the fine powder was also preliminarily treated with different solvents, as follows, in order to extract the coagulant agent: (i) distilled water; (ii) solutions of NaCl (0.25; 0.5 and 1 M); (iii) solutions of NaOH (0.025; 0.05 and 0.1 M); and (iv) solutions of HCl (0.025; 0.05 and 0.1 M). Standard Jar Test assays were conducted to evaluate the performance of the coagulant in the different considered operational conditions. Results of the study indicated that at low turbidity (e.g., 13.0 ± 0.1 NTU), the raw acorn leaf powder and those treated with distilled water (DW) were able to decrease the turbidity to 3.69 ± 0.06 and 1.97 ± 0.03 NTU, respectively. The use of sodium chloride solution (AC-NaCl) at 0.5 M resulted in a high turbidity removal efficiency (91.07%) compared to solutions with different concentrations (0.25 and 1 M). Concerning solutions of sodium hydroxide (AC-NaOH) and hydrogen chloride (AC-HCl), the lowest final turbidities of 1.83 ± 0.13 and 0.92 ± 0.02 NTU were obtained when the concentrations of the solutions were set at 0.05 and 0.1 M, respectively. Finally, in this study, other water quality parameters, such as total alkalinity hardness, pH, electrical conductivity and organic matters content, were measured to assess the coagulant performance on drinking water treatment.

【 授权许可】

Unknown