Mohammad Yousefi; Ehsan Jabbari; Mehdi Sedighi
Abstract
Water shortages and pollution are so severe that the last decade has been called the international decade for water. In water treatment plants, coagulation and flocculation are used to remove turbidity. This study examined the use of naturalcoagulants and its efficiency compared with existing coagulants. ...
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Water shortages and pollution are so severe that the last decade has been called the international decade for water. In water treatment plants, coagulation and flocculation are used to remove turbidity. This study examined the use of naturalcoagulants and its efficiency compared with existing coagulants. Response surface methodology was used to design the experiments. Type of coagulant and coagulant aid, as well as pH, were considered important factors during experiments. Results of the tests indicate that pH has a significant impact on turbidity removal. The combination of chitosan and polyaluminum chlirode reduces water turbidity effectively. A combination of polyaluminum chlirode (7.6 mg/L) and chitosan (9.28 mg/L) at pH= 8.52 removed 99.85 % of the turbidity. Accordingly, the combined use of polyaluminum chlirode and chitosan reduced the amount of material and enhanced turbidity removal.
Tooba Naveed; Niaz Ahmed; Shahid Bhutto; Nazeer Tunyo; Durdana Rais Hashmi
Abstract
Presently, Pakistan is the 8th largest exporter of textile products in the world andthis sector is considered the backbone of Pakistan’s economy. Due to intensifieduse of dyes, chemicals, and water, the textile sector is also listed as the highestcontributor to environmental pollution. Therefore, ...
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Presently, Pakistan is the 8th largest exporter of textile products in the world andthis sector is considered the backbone of Pakistan’s economy. Due to intensifieduse of dyes, chemicals, and water, the textile sector is also listed as the highestcontributor to environmental pollution. Therefore, to approach the demand of newglobal trend towards sustainability, the textile industry along with others need tofocus on resource recovery and reuse. The present study was therefore plannedfor the treatment of textile effluent composed from 04 textile mill samples. Thetextile effluent is treated by employing coagulation, ozone oxidation, andultrafiltration techniques. All the samples exceeded the standard limits as given inSindh Environmental Quality Standard (SEQS 2016). Each individual treatmentprovided promising results in terms of reduction in pollution load. Overall findingsrevealed a remarkable decrease in total suspended solid (TSS) (96 %), totaldissolved solid (TDS) (78 %), chemical oxygen demand (COD) (93 %), BiologicalOxygen Demand-BOD (93 %), oil & grease (96 %) and heavy metals (HM) (98 %).It is suggested that combined techniques are the best option for textile effluenttreatment.
