A Novel Process for Nutrients Removal and Phosphorus Recovery From Domestic Wastewater by Combining BNR With Induced Crystallization

Abstract

Abstract. Trinitrotoluene (TNT), a commonly used explosive for military and industrial applications, can cause serious environmental pollution. 28-day laboratory pot experiment was carried out applying bioaugmentation using laboratory selected bacterial strains as inoculum, biostimulation with molasses and cabbage leaf extract, and phytoremediation using rye and blue fenugreek to study the effect of these treatments on TNT removal and changes in soil microbial community responsible for contaminant degradation. Chemical analyses revealed significant decreases in TNT concentrations, including reduction of some of the TNT to its amino derivates during the 28-day tests. The combination of bioaugmentation-biostimulation approach coupled with rye cultivation had the most profound effect on TNT degradation. Although plants enhanced the total microbial community abundance, blue fenugreek cultivation did not significantly affect the TNT degradation rate. The results from molecular analyses suggested the survival and elevation of the introduced bacterial strains throughout the experiment. Keywords: TNT, bioaugmentation, biostimulation, phytoremediation, microbial community.

Phosphate substances transformation and vivianite formation in P-Fe containing sludge during the transition process of aerobic and anaerobic conditions

“…Compared with the struvite method, the calcium phosphate precipitation method can obtain higher phosphorus recovery, but it is difficult to separate the solids in the precipitation. Also, the calcium phosphate is a poor fertilizer ( Zou and Wang, 2016 , Zou et al, 2014 ).…”

Metabolic shift of polyphosphate-accumulating organisms with different levels of polyphosphate storage

“…Nevertheless, further research is needed in order to assess the long-term effect of the P extraction step and the economic feasibility of the second strategy. On the other hand, other authors obtained lower P recovery efficiencies, around 79% (Xia et al, 2014), 60% (Barat and van Loosdrecht, 2006) and 70.2% (Zou et al, 2014) using a side stream system in the water line. The next step for the application of this new operation mode in a SBR-WWTP aiming the final Precovery will imply the treatment of the P enriched stream in a crystallization reactor for P recovery as struvite (Pastor el al.…”

Nitrogen Sequestration During Sewage Sludge Composting and Vermicomposting

“…Improved wastewater collection systems, which refer to modern purification and treatment technologies, lead to an increase in the amount of sludge produced during wastewater treatment (Zou et al, 2014). Most of this sludge is stored in the sludge sites of a sewage treatment facility, and only a small part of it is used in agriculture and the production of biogas.…”