Geopolymers have been recently explored as sorbents for wastewater treatment, thanks to their mechanical and chemical stability low-energy manufacturing process. One specific application could be the removal of ammonium (NH4+) through exchange with Na+ ions. Additive (AM) represents an especially interesting option fabrication, it allows tailor size, distribution, shape, interconnectivity pores, therefore access charge-bearing sites. The present study provides a proof concept NH4+ from using...

Five alkali-activated analcime (ANA) sorbents (ANA-MK 1, ANA 2, 3, ANA-MK 4, and 5) were developed for ammonium (NH4+) ion removal. Acid treatment calcination used as pre-treatments analcime, metakaolin (MK) was a blending agent in three sorbents. Sorption experiments performed to evaluate the effects of sorbent dosage (1–20 g L−1), initial NH4+ concentration (5–1000 contact time (1 min–24 h). 4 most efficient removal, with maximum experimental sorption uptake 29.79, 26.00, 22.24 mg g−1,...

Vanadium (V) is a critically important element in many industries. A widely used recovery process combination of roasting and leaching. However, an energy-intensive stage. Generally, basic oxygen furnace (BOF) slag high calcium (Ca) but low V. Ca content its chemical nature can prevent V This study presents potential two-stage leaching for from BOF slag. The method environmentally friendly using temperatures enabling leachate recycling. Furthermore, the utilisation rate be higher due to...

The European Union's circular economy strategy aims to increase the recycling and re-use of products waste materials. According strategy, use industry materials side flows is required be more effective. In this research, a chemical precipitation method simultaneously remove ammonium phosphate from reject water anaerobic digestion plant using calcined paper mill sludge fly ash as precipitant, was tested. Paper material formed in paper-making process, another power plant. Objective research...

Phosphorus as phosphate and nitrogen ammonium or nitrate are the main nutrients in wastewaters agricultural sludges. They runoff easily to waterways cause eutrophication water bodies. However, could be precipitated simultaneously used recycled nutrients. In this research, dolomite calcined at 650 °C, 750 950 °C commercial MgO were precipitants simultaneous removal from synthetic (NH4)2HPO4 solution sludge. Calcination was preferred option decomposed CaCO3 for optimal struvite precipitation....

In this study, novel and cost-effective alkali-activated materials (AAMs) for catalytic applications were developed by using an industrial side stream, i.e., blast furnace slag (BFS). AAMs can be prepared from aluminosilicate precursors under mild conditions (room temperature non-hazardous chemicals). synthesized mixing BFS a 50 wt % sodium hydroxide (NaOH) solution at different BFS/NaOH ratios. The pastes poured into molds, followed consolidation 20 or 60 °C. As the active metal, Fe was...

The aim of this study was to examine the removal ammonium ions from a synthetic model solution by using Na-zeolite-based geopolymers. Na-zeolite (=analcime) is residue mining industry. Three adsorbents were prepared different production steps and metakaolin as blending agent. These novel investigated in fixed-bed column system where effects flow rates with initial concentration 40 mg/L studied. Thomas, Bohart–Adams Yoon–Nelson breakthrough curve models fitted well experimental data high R2...

To develop more sustainable purification and recovery processes, it is critical to accurately determine inorganic impurities of natural graphite (NG) valuable elements present in low concentrations steelmaking slag. This study applied three microwave-assisted acid digestion methods for basic oxygen furnace (BOF) slag, NG, NG ash. Nitric (HNO3), hydrochloric (HCl), hydrogen fluoride (HF) were used method 1. In 2, 1 was followed by boric (H3BO3) digestion. 3, acids (HNO3, HCl, HF, H3BO3) added...

The mining industry is a very rapidly increasing production sector in Finland. Many new mines have been opened recently and others are the planning phase. Mining legislation has revised compilation of an ID-directive (Industrial Emission Directive, 2010) required to implement environmental law revision progress. aim this study was compare different digestion methods recommended by Finnish Environmental Administration for threshold guideline value determinations PIMA Decree (214/2007)...

The European Union’s circular economy strategy aims to increase the recycling and re-use of products waste materials. According strategy, use industry material should be more effective. A chemical precipitation method simultaneously remove phosphorus nitrogen from synthetic (NH4)2HPO4 solution liquid phase anaerobic digestate using fly ash as a precipitant was tested. Fly is formed in power plant process. It mainly contains calcium oxide (CaO) magnesium (MgO). Saturated prepared ash, which...

The current growth strategy and environmental legislation of the European Union both aim to increase amount renewable energy improve use waste streams. These policies mean there will be an increasing need utilise bio ash. Currently, Finland Denmark are only countries with specific national concerning ash use. Sweden has recommendations fertilisers. Besides having different limit values for harmful elements nutrients in fertilisers, all these have digestion methods that allowed element...

Abstract Struvite is a suitable fertilizer, and electrochemical precipitation of nutrients from industrial waters provides one answer to the circular economy. Molar ratio between ammonium phosphate crucial: Water for includes more or at least same amount than phosphate. That kind water typically does not exist in industry. Therefore, ammonium‐rich was mixed with phosphorus‐rich obtain molar struvite precipitation. Parameters were studied determine their effect on removal‐% yield. 100% yield...

Struvite (NH4MgPO4∗6H2O) is a slow-release fertilizer produced from phosphorus and nitrogen-containing wastewater in the presence of Mg salts. Commercial salts are single most significant cost struvite precipitation. In this study, H2SO4 formed as an industrial sidestream was used to prepare MgSO4 solution waste dolomite (DOL) fly ash (FA). then precipitate synthetic (NH4)2HPO4 actual process waters. The best results were obtained with real waters where over 99% phosphate about 80% ammonium...

Wastewaters and agricultural sludges can contain high concentrations of phosphate ammoniumor nitrate-nitrogen, which run off easily to waterways causing eutrophication in water bodies.However, it is possible precipitate ammonium as struvite use recycled fertilizer.In this research, MgSO 4 solution obtained by treating fly ash (FA) or dolomite (DOL) with sulfuric acid was used a precipitant for simultaneous phosphorus nitrogen removal from synthetic (NH ) 2 HPO solution.Precipitation...