Abstract
Incineration of sewage sludge produces every year huge amounts of sewage sludge ash. Due to its porosity and composition, sewage sludge ash can be used as an adsorbent for heavy metal ions removal. The present paper discusses the efficiency and feasibility of its use as an adsorbent for Pb (II) and Cu (II) removal in single and binary systems. Sewage sludge ash dosage, pH influence, equilibrium and kinetic studies were examined. The results show that sewage sludge ash is an effective and environmentally friendly adsorbent. The maximum adsorption capacity was 25.0 mg/g for Pb (II) and 7.5 mg/g for Cu (II). The presence of the competitive metal led to lower adsorption rate. The study concludes that sewage sludge ash is a promising adsorbent for Pb (II) and Cu (II) removal from wastewater presenting both economic and environmental benefits.
Highlights
The management of the sewage sludge generated by municipal wastewater plants has become an important issue in the last years [1].Twenty-seven European Union countries generated more than 11.5 million tons of sewage sludge in2015, and this quantity is expected to increase up to 13 million tons by 2020 due to industrialization and urbanization [2,3,4,5]
The main crystalline phases identified before adsorption revealed the presence of quartz (SiO2 ), calcium phosphate (Ca2 P2 O7 ) and hematite (Fe2 O3 )
The results showed that the values of correlation coefficient for both single and binary systems were higher for the pseudo-second-order kinetic model than those obtained for pseudo-first-order kinetic model
Summary
The management of the sewage sludge generated by municipal wastewater plants has become an important issue in the last years [1].Twenty-seven European Union countries generated more than 11.5 million tons of sewage sludge in2015, and this quantity is expected to increase up to 13 million tons by 2020 due to industrialization and urbanization [2,3,4,5]. The management of the sewage sludge generated by municipal wastewater plants has become an important issue in the last years [1]. Twenty-seven European Union countries generated more than 11.5 million tons of sewage sludge in. In the past few years, European Union promoted the ecological management of such wastes by introducing directives regarding sewage sludge management and classical methods, such as storage, are being replaced by methods leading to waste stabilization and safe recycling. There are several methods for sewage sludge management presented in the literature: anaerobic co-digestion [6], composting [7], incineration [8], co-incineration [9] and cementing [10]. Incineration is one of the most used alternatives Even though this method reduces the volume and stabilizes the sewage sludge, its disposal still represents a significant environmental issue [11]
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