Removal of phosphorus from secondary effluent by a matrix filter

Removal of nitrogen from anaerobically digested swine wastewater using an anoxic/oxic (A/O) process complemented with a sulfur-packed biofilter

“…discharge of swine wastewater containing excess inorganic nitrogen into natural waters causes the overgrowth of algae that ultimately promotes eutrophication of lakes and streams (Deng et al, 2009;El-Hoz and Apperley, 1996;Lim et al, 2009;Sumino et al, 2006). Therefore, post-treatment is necessary in order to remove nitrogen as well as organic matter from swine wastewater (Bernet and Beline, 2009;Bortone, 2009;Obaja et al, 2003;Waki et al, 2008).…”

Optimization of phosphorus removal from secondary effluent using simplex method in Tianjin, China

“…Because activated sludge plants have been relatively successful in removing nutrients biologically, coagulation of secondary effluent is usually the first step in the wastewater reclamation process intended for reuse. Coagulants are used to reduce phosphorus and other contaminants in the secondary effluent intended for reuse [9][10][11][12]. Clark and Stephenson [12] provided guidance on the optimum conditions for removal of phosphorus compounds in secondary effluent by using factorial design and simplex design.…”

Removal of phosphate from secondary effluent with Fe2+ enhanced by H2O2 at nature pH/neutral pH

“…Phosphorus present in domestic wastewater was an important nutrient, and the discharge of this nutrient into natural waters would lead to impairing the drinking water sources considerably. Some studies have confirmed that phosphorus concentrations in secondary effluents were over sewage standard [2][3][4][5]. Therefore, the phosphate must be removed from secondary effluents before their dispersion in the environment.…”

“…Aluminum and iron salts had received considerable interest from environmental chemists due to their applications as coagulants in water treatment [6] and as phosphate removing agents in tertiary sewage treatment [7]. It is well known that Fe(III)-and Al(III)-based coagulants are used to reduce phosphorus and other contaminants in the secondary effluent for reuse [2,5,[8][9][10]. The P chemistry is strongly related to the Fe chemistry due to the strong interaction of P with Fe and Fe-oxyhydroxides [11][12][13].…”