Recovering phosphorus as struvite from the digested swine wastewater with bittern as a magnesium source

2011 ◽  
Vol 64 (2) ◽  
pp. 334-340 ◽  
Author(s):  
Zhi-Long Ye ◽  
Shao-Hua Chen ◽  
Min Lu ◽  
Jian-Wen Shi ◽  
Li-Feng Lin ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Low Cost ◽  
Phosphate Removal ◽  
Swine Wastewater ◽  
Nitrogen And Phosphorus ◽  
Balance Analysis ◽  
Struvite Precipitation ◽  
Mass Balance Analysis ◽  
Crystal Product ◽  
Magnesium Source

Recovering nitrogen and phosphorus through struvite (MgNH4PO4·6H2O) crystallization from swine wastewater has gained increasing interest. However, swine wastewater contains complex compositions, which may hinder the formation of struvite crystal and affect the purity of the precipitates by forming other insoluble minerals. In this work, experiments were carried out to evaluate struvite precipitation in the anaerobically digested swine wastewater, with dosing bittern as a low-cost magnesium source. Exceeded 90% phosphate removal and 23–29% ammonium reduction were obtained. FTIR, XRD and mass balance analysis were combined to analyze the species of precipitated minerals. Results showed that the precipitates were struvite, mixed with amorphous calcium phosphate (ACP) and brucite. The presence of Ca2+ diminished the percentage of struvite and gave rise to ACP formation. Controlling pH below 9.5 and bittern dosage above 1% (w/w) could inhibit ACP precipitation and harvest a highly pure struvite crystal product.

The Effect of Organic Compounds on the Recovery of Ammonium by Struvite Precipitation from Swine Anaerobic Digester Effluent

2012 ◽  
Vol 610-613 ◽  
pp. 2350-2355 ◽  
Author(s):  
Ji Dan Liu ◽  
Zu Xin Xu ◽  
Wei Gang Wang ◽  
Wei Jin
Keyword(s):  
Organic Compounds ◽  
Swine Manure ◽  
Swine Wastewater ◽  
Molar Ratio ◽  
Nitrogen And Phosphorus ◽  
Anaerobic Digester Effluent ◽  
Potassium Hydrogen ◽  
External Sources ◽  
Struvite Precipitation ◽  
Co Precipitation

Recovering nitrogen and phosphorus through struvite crystallization from swine wastewater has gained increasing interest. However, effluents of anaerobic digested swine wastewater contains other constituents including complex and hardly definited organic compounds, which may hinder the formation of struvite crystal and affect the purity of the precipitates by forming other insoluble minerals. Struvite precipitation was carried out at laboratory scale by adding magnesium chloride and potassium hydrogen as external sources of magnesium and phosphorus to equal Mg: N: P molar ratio, respectively, and regulating the pH at 9.5 in the absence and presence of organic compounds. Exceeded 70% phosphate and ammonium reduction were obtained. The recovered products were detected and analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD) and chemical methods, which were proved to be struvite crystals. The soluble organic compounds had less than 6% changes in amount during struvite precipitation and it was proved that the removal of TCOD during the precipitation of struvite may be attributed to the co-precipitation of struvite. The results indicate that struvite precipitation could be a viable method of ammonium removal in the presence of organic compounds from anaerobically digested swine manure.

Effects of Aeration on Nitrogen and Phosphate Removal with A2O Process

2012 ◽  
Vol 622-623 ◽  
pp. 1738-1741 ◽  
Author(s):  
Yong Feng Li ◽  
Jian Yu Yang ◽  
Guo Cai Zhang
Keyword(s):  
Phosphorus Removal ◽  
High Efficiency ◽  
Low Cost ◽  
Significant Decline ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
System A ◽  
Nitrogen And Phosphate Removal

A2O process is shortened form Anaerobic-Anoxic-Aerobic process, which can achieve carbon, nitrogen and phosphate removal, is widely used for its low cost and high efficiency. The Experiment using a 52.15 L anaerobic-anoxic- aerobic (A2O) reactor with simulate synthetic wastewater, by adjusting the aeration of Aerobic units, observing the performance of nitrogen and phosphorus removal under different dissolved oxygen(DO). The result of the whole operation show that the system can not keep a high TN removal efficiency under high aeration, and the low aeration made the system a significant decline in nitrogen and phosphorus removal.

scholarly journals Advances in Struvite Precipitation Technologies for Nutrients Removal and Recovery from Aqueous Waste and Wastewater

2020 ◽  
Vol 12 (18) ◽  
pp. 7538 ◽  
Author(s):  
Alessio Siciliano ◽  
Carlo Limonti ◽  
Giulia Maria Curcio ◽  
Raffaele Molinari
Keyword(s):  
Slow Release ◽  
Low Cost ◽  
Theoretical Background ◽  
Operating Conditions ◽  
Nitrogen And Phosphorus ◽  
Agronomic Practices ◽  
Aqueous Waste ◽  
Recent Developments ◽  
Struvite Precipitation ◽  
Removal And Recovery

The abatement of nutrient compounds from aqueous waste and wastewater is currently a priority issue. Indeed, the uncontrolled discharge of high levels of nutrients into water bodies causes serious deteriorations of environmental quality. On the other hand, the increasing request of nutrient compounds for agronomic utilizations makes it strictly necessary to identify technologies able to recover the nutrients from wastewater streams so as to avoid the consumption of natural resources. In this regard, the removal and recovery of nitrogen and phosphorus from aqueous waste and wastewater as struvite (MgNH4PO4·6H2O) represents an attractive approach. Indeed, through the struvite precipitation it is possible to effectively remove the ammonium and phosphate content of many types of wastewater and to produce a solid compound, with only a trace of impurities. This precipitate, due to its chemical characteristics, represents a valuable multi-nutrients slow release fertilizer for vegetables and plants growth. For these reasons, the struvite precipitation technology constantly progresses on several aspects of the process. This manuscript provides a comprehensive review on the recent developments in this technology for the removal and recovery of nutrients from aqueous waste and wastewater. The theoretical background, the parameters, and the operating conditions affecting the process evolution are initially presented. After that, the paper focuses on the reagents exploitable to promote the process performance, with particular regard to unconventional low-cost compounds. In addition, the development of reactors configurations, the main technologies implemented on field scale, as well as the recent works on the use of struvite in agronomic practices are presented.

scholarly journals A comprehensive review on nitrate and phosphate removal and recovery from aqueous solutions by adsorption

2021 ◽  
Author(s):  
Alemu Gizaw ◽  
Feleke Zewge ◽  
Arun Kumar ◽  
Andualem Mekonnen ◽  
Melakuu Tesfaye
Keyword(s):  
Low Cost ◽  
Nitrate Removal ◽  
Equilibrium Concentration ◽  
Phosphate Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Operational Conditions ◽  
Removal Capacity ◽  
Number Of Cycles ◽  
Removal And Recovery

Abstract Nitrogen and phosphorus removal and recovery are considered as one of the interventions to control water bodies' eutrophication by application of various methods. Adsorption is an effective method for phosphate and nitrate removal from wastewater. It is efficient, quick, easy, low-cost and environmentally friendly. Even though different adsorbents have been developed with excellent properties, lack of compilation, lack of consistency in operational conditions, and lack of other important parameters used for direct comparison and practical use selection were observed. The first aim of this review is to provide facts and figures on novel adsorbents used for nitrate, phosphate, and simultaneous nitrate-phosphate removal and recovery. Second, various adsorbents applied for nitrate and phosphate removal have been compared in terms of the number of cycles that the adsorbent used; retained removal capacity (RR); the removal capacity of the adsorbent considering the threshold limit settled by EU and EPA as equilibrium concentration for phosphate (q0.1) and nitrate (q10); and time to reach the equilibrium capacity (t90). Third, based on the aforementioned criteria, the best adsorbents are proposed and this is the key novelty of this review work. Moreover, future aspects and challenges regarding nitrate and phosphate removal and recovery are presented.

scholarly journals Novel Lime Calcination System for CO2 Capture and Its Thermal–Mass Balance Analysis

ACS Omega ◽  
2020 ◽  
Vol 5 (42) ◽  
pp. 27413-27424
Author(s):  
Yuehan Yang ◽  
Li Wang ◽  
Dehong Xia ◽  
Zeyi Jiang ◽  
Binfan Jiang ◽  
...  
Keyword(s):  
Mass Balance ◽  
Co2 Capture ◽  
Thermal Mass ◽  
Balance Analysis ◽  
Mass Balance Analysis

scholarly journals Adsorptive Removal of Phosphate from Aqueous Solutions Using Low-Cost Volcanic Rocks: Kinetics and Equilibrium Approaches

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1312
Author(s):  
Dereje Tadesse Mekonnen ◽  
Esayas Alemayehu ◽  
Bernd Lennartz
Keyword(s):  
Aqueous Solutions ◽  
Low Income ◽  
Low Cost ◽  
Volcanic Rocks ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Adsorptive Capacity ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Adsorptive Removal

The contamination of surface and groundwater with phosphate originating from industrial and household wastewater remains a serious environmental issue in low-income countries. Herein, phosphate removal from aqueous solutions was studied using low-cost volcanic rocks such as pumice (VPum) and scoria (VSco), obtained from the Ethiopian Great Rift Valley. Batch adsorption experiments were conducted using phosphate solutions with concentrations of 0.5 to 25 mg·L−1 to examine the adsorption kinetic as well as equilibrium conditions. The experimental adsorption data were tested by employing various equilibrium adsorption models, and the Freundlich and Dubinin-Radushkevich (D-R) isotherms best depicted the observations. The maximum phosphate adsorption capacities of VPum and VSco were calculated and found to be 294 mg·kg−1 and 169 mg·kg−1, respectively. A pseudo-second-order kinetic model best described the experimental data with a coefficient of correlation of R2 > 0.99 for both VPum and VSco; however, VPum showed a slightly better selectivity for phosphate removal than VSco. The presence of competitive anions markedly reduced the removal efficiency of phosphate from the aqueous solution. The adsorptive removal of phosphate was affected by competitive anions in the order: HCO3− >F− > SO4−2 > NO3− > Cl− for VPum and HCO3− > F− > Cl− > SO4−2 > NO3− for VSco. The results indicate that the readily available volcanic rocks have a good adsorptive capacity for phosphate and shall be considered in future studies as test materials for phosphate removal from water in technical-scale experiments.

Removal of Phosphate Species from Solution by Adsorption onto Red and Grey Ceramic Clay Used as Adsorbent

2014 ◽  
Vol 675-677 ◽  
pp. 434-439
Author(s):  
Yi Liang Yao ◽  
Chang Yu Lu ◽  
Wie Sheng Guan ◽  
Hai Gang Gou ◽  
Wei Huang
Keyword(s):  
Waste Water ◽  
Low Cost ◽  
Phosphate Removal ◽  
Liquid Ratio ◽  
Phosphate Species ◽  
Water Problems ◽  
And Control ◽  
Water Eutrophication ◽  
Clay Materials ◽  
Ceramic Clay

Waste water is becoming more and more around us and phosphates exit everywhere in waste water. Eutrophication, the most common phenomenon caused by phosphate, can lead to water problems. Therefore, searching suitable materials to remove and control phosphate in waste water is of great significance. In this reach project, the method of adsorption was chosen to remove phosphate and two kinds of ceramic clay materials which were low cost and easily available as adsorbent for adsorption were used for phosphate removal. According to the removal efficiency of phosphate removal, temperature, solid to liquid ratio, the original concentration of phosphate and experiment time were studied in the experiments.

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