Simultaneous Recovery Of Ammonium Research Articles

Simultaneous recovery of ammonium and phosphate from aqueous solutions using Mg/Fe modified NaY zeolite: Integration between adsorption and struvite precipitation

Currently, the closure of the nutrient circular loop and contaminant removal from wastewater are drawing widespread attention. In this study, a novel MgO/iron oxide-modified NaY zeolite (MNZ) was prepared and used for the integration of adsorption and struvite precipitation to simultaneously reclaim ammonium and phosphate from wastewater. The results proved that MgO and iron oxide nanoparticles were successfully embedded in the zeolite matrix, providing high adsorption performance for ammonium and phosphate, reaching 380.02 (as NH + 4) and 324.68 (as PT) mg/g, respectively. The presence of NO3− , Cl−, SO42−, and HCO3− did not significantly influence the adsorption of ammonium and phosphate. Struvite precipitation on the MNZ surface is the primary mechanism for the recovery of both ammonium and phosphate with electrostatic attraction and ion exchange also involved in ammonium uptake. These results indicate that optimized MNZ is promising for nutrient recovery from wastewater because of its high selectivity for targeted absorbates and its potential application as a slow-release eco-fertilizer.

Green electricity-driven simultaneous ammonia recovery and in-situ upcycling for microbial protein production

Currently, hydrogen-oxidizing bacteria (HOB) based power-to-protein is a promising approach to produce alternative microbial protein (MP), however, the nitrogen source used was either derived from commercial products or was firstly recovered from waste streams and then diluted for HOB growth. In the present study, simultaneous ammonium recovery from wastewater and in-situ utilization for the green MP (derived from Cupriavidus necator 335) production was successfully demonstrated using a microbial electrochemical recovery conversion cell (MERC). 0.41 ∼ 0.82 g/L of dried biomass (protein content 49 ∼ 63%) was yielded in 36 h with a power supply of 3, 4, and 5 V. C. necator 335 could grow in the MERC system receiving wastewater with a broad range of ammonium (0.05 ∼ 8 g N/L) and the highest biomass production of 0.9 g/L (protein content 54%) was achieved at 2 g N/L. 2.69 g/L of dried biomass containing 57% protein was obtained in 120 h with an initial supply of 1 L CO2 and 2 g N-NH4+. Applied voltages and ammonium concentrations showed a minor impact on the amino acid profile. Furthermore, the MERC system was tested with real waste streams (e. g., municipal wastewater, and digestate) and 0.45 ∼ 1.22 g biomass/L (protein content 52 ∼ 62%) were harvested. The characteristics of the wastewater streams (e. g., ammonium concentration and conductivity) could significantly affect the system performances. The harvested MP from real wastewater showed a high quality of amino acid profile and implied a potential in substituting traditional plant/animal-based protein.

Simultaneous recovery of ammonium and total phosphorus from toilet tail water by modified palygorskite-bentonite clay.

Suitable treatment of toilet sewage is a worldwide challenge. The anaerobic baffled reactor (ABR)-microbial fuel cell (MFC)-microbial electrolysis cell (MEC) (AMM) coupling treatment system has been constructed achieving effective removal of carbon, nitrogen, and phosphorus from toilet sewage and resource recovery; however, ammonium (NH4 + -N) and total phosphorus (TP) accumulation in tail water is a found problem of the system. In this study, acid-modified and alkali-heat modified palygorskite-bentonite (Pal-Ben) were used to recover NH4 + -N and TP from the AMM toilet tail water simultaneously. The higher adsorption capacity of the modified clay is attributed to the changes of surface structure of the material. The modified clay Pal-Ben (mass ratio 1:3) activated with alkali performed the highest NH4 + -N and TP recovery rates of 83.6% and 85.5%, respectively. The adsorption of NH4 + -N was more in line with the pseudo-second-order kinetic model and confirmed to be a chemical adsorption process, while the adsorption of TP was more in line with the pseudo-first-order kinetics and a physical adsorption process; the adsorption capacity of NH4 + -N accelerated with decrease of TP removal when pH increased. This study developed a low cost and high capacity of alkaline thermally modified clay removing/recovering NH4 + -N and TP from toilet tail water simultaneously. PRACTITIONER POINTS: A cheap composite clay was developed to recover nitrogen and phosphorus from toilet tail water simultaneously. The low costs and high capacity of alkaline thermally modified clay make it stand out in NH4 + -N and TP removal of toilet tail water. The process mechanism of simultaneous nitrogen and phosphorus recovery was clarified with characterization and kinetic model fitting. The used clay loaded with nutrients could be applied as a slow-release compound fertilizer for soil improvement.

回分式反応装置を用いた養豚廃水からのN,P,K同時回収

回分式反応装置を用いた養豚廃水からのN,P,K同時回収

Simultaneous Recovery of Ammonium and Phosphate from Leachate by Using Activated Zeolite

Ammonium and phosphate in leachate are potentially to contaminate both surface and groundwater. Zeolite has a high affinity so it can be used as an adsorbent for ammonium (NH4+), phosphate (PO43-) and other organic compounds. This research work aims to eliminate these pollutants stimulatingly by using activated zeolite. Leachate used for this experiment has initial ammonium concentration of 508.2 mg/L, and phosphate concentration of 7.77 mg/L. The zeolite has particle size of 100 mesh. Adsorption experiments were carried out with physically activated zeolite and physic-chemical activated zeolite with a dose variation of 15 - 120 g / L with a contact time of 12 hours. The results showed that a physical activated zeolite dosage of 120 g/L results in the smallest concentration of ammonium residue of 72.6 mg/L and a phosphate residue of 0.37 mg/L. The 45 g / L chemically-physically activated zeolite dose of 45 g/L produces an ammonium residue of 198 mg/L and phosphate residue of 0.74 mg/L. The ammonium adsorption with the both activated zeolites can be described very well using the 1st order kinetics model.

Simultaneous recovery of ammonium, potassium and magnesium from produced water by struvite precipitation

Unconventional oil and gas industries generate huge amounts of produced water (PW) containing high concentrations of potentially hazardous organic and inorganic contaminants. This study demonstrated the feasibility of simultaneously recovering NH4+, K+ and Mg2+ from PW by struvite precipitation after calcium pretreatment with Na2CO3 addition or CO2 stripping. Without pretreatment, calcium exhibited strong competition for phosphate through the formation of Ca3(PO4)2 precipitate. The pretreatment with a Ca2+:CO32− molar ratio of 1:1.2 achieved a relatively low loss rate of Mg2+ (31.3%) and high Ca2+ removal efficiency (95.9%). The results also revealed that the Mg/N/P molar ratio and solution pH had a remarkable effect on the struvite precipitation, while the seeding dosage and Na+ slightly influenced struvite formation. The combination of pH = 9.5 & Mg/N/P molar ratio = 1.5:1:1.5 was ideal for struvite recovery from PW, resulting in NH4+, K+ and Mg2+ recovery efficiencies of 85.9%, 24.8% and 96.8%, respectively. The results of X-ray diffraction and scanning electron microscopy further confirmed that the precipitates generated at this optimal condition were orthorhombic struvite. Moreover, along with the struvite recovery, no accumulation of heavy metals and organic contaminants was observed, indicating that the struvite quality was sufficient for field application. Furthermore, struvite recovery process was able to reduce the Microtox toxicity of PW towards Vibrio fischeri by 60%. Considering the low cost and relatively simple technology, struvite precipitation process has the potential to be used for large-scale applications for produced water treatment and resource recovery.

養豚廃水からのN,P,K同時回収におけるK回収率の向上

養豚廃水からのN,P,K同時回収におけるK回収率の向上

Effect of the Quality of Wastewater from Swine Production on the Simultaneous Recovery of Ammonium, Phosphorus and Potassium and the Composition of the Recovered Product

Effect of the Quality of Wastewater from Swine Production on the Simultaneous Recovery of Ammonium, Phosphorus and Potassium and the Composition of the Recovered Product

晶析法を用いた養豚廃水中の窒素・リン・カリウムの同時回収

晶析法を用いた養豚廃水中の窒素・リン・カリウムの同時回収

晶析法を用いた養豚廃水中の窒素・リン・カリウムの同時回収

晶析法を用いた養豚廃水中の窒素・リン・カリウムの同時回収

Simultaneous recovery of ammonium and phosphorus via the integration of electrodialysis with struvite reactor

To eliminate the waste to discharge or backflow to the headstream of the wastewater treatment plant, recovering ammonia and phosphate (N&P) salts from Sidestreams of anaerobic digesting excess sludge was investigated. Electrodialysis (ED) technology was used mainly for desalting and concentrating wastewater. An integration of struvite reactor and ammonia stripping was established to recover N&P from the concentrated wastewater. During single ED experiments, removal ratio of ammonia and phosphate salts were in the ranges of 95.8–100% and 86.1–94.4%, respectively. During the integration of ED and struvite reactor, the concentrated N&P salts were effectively used to form the struvite while the desalination ratio was kept at a high level. After the generation of struvite, a small amount of ammonia salt was still remained in the concentrated N&P solution. The introduction of gas stripping could result in an effective extraction and recovery of ammonia. X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) were conducted to characterize the obtained precipitates. The diffractograms peaks of the precipitates were well correlated with the struvite pattern, confirming the formation of struvite from the wastes.