Recovery and removal of nutrients from swine wastewater by using a novel integrated reactor for struvite decomposition and recycling

Abstract

In the present study, struvite decomposition was performed by air stripping for ammonia release and a novel integrated reactor was designed for the simultaneous removal and recovery of total ammonia-nitrogen (TAN) and total orthophosphate (PT) from swine wastewater by internal struvite recycling. Decomposition of struvite by air stripping was found to be feasible. Without supplementation with additional magnesium and phosphate sources, the removal ratio of TAN from synthetic wastewater was maintained at >80% by recycling of the struvite decomposition product formed under optimal conditions, six times. Continuous operation of the integrated reactor indicated that approximately 91% TAN and 97% PT in the swine wastewater could be removed and recovered by the proposed recycling process with the supplementation of bittern. Economic evaluation of the proposed system showed that struvite precipitation cost can be saved by approximately 54% by adopting the proposed recycling process in comparison with no recycling method.

Phosphate enhance recovery from wastewater by mechanism analysis and optimization of struvite settleability in fluidized bed reactor

“…This process is regarded as the end step of wastewater treatment, even when multiple P treatment technologies are being employed. Following this step, more than 92% of P may have been removed from wastewater 4 5 6 7 . However, the struvite crystallization process is hindered by small particle size and crystal growth control difficulties.…”

Nucleação na formação de estruvita: estado da arte

“…• faltam incentivos legais e econômicos para a reciclagem do fósforo visando a segurança alimentar no futuro (HAO et al, 2013;DESMIDT et al, 2015;HUANG et al, 2015;KATAKI et al, 2016a;2016b).…”

Modeling and optimization of struvite recovery from wastewater and reusing for heavy metals immobilization in contaminated soil

“…In soil, if PO 4 3− can be released from struvite which formed in the process of nutrients recovery from wastewater, heavy metals immobilization may be achieved by formation of metal‐phosphate, and a ‘bridge’ between wastewater treatment and soil remediation will be constructed. According to Equation , high alkalinity is beneficial to dissolution of struvite, and OH − can react with Mg 2+ easier than PO 4 3− . Hence, PO 4 3− may be released from struvite for heavy metals immobilization when plant ash is mixed with plant ash to increase pH of soil.…”

“…According to Equation 2 , high alkalinity is beneficial to dissolution of struvite, and OH − can react with Mg 2+ easier than PO 4 3− . 41 Hence, PO 4 3− may be released from struvite for heavy metals immobilization when plant ash is mixed with plant ash to increase pH of soil.…”