Total Phosphorus Removal Research Articles

Electrochemically enhanced micro-electrolytic ceramic substrate infiltration system as an efficient approach for treatment of imidacloprid wastewater.

In this study, an electrochemically coupled micro-electrolytic technology-enhanced soil infiltration system (E-ME-SIS) was proposed to address the problem of the high cost of traditional soil infiltration system (SIS) and the difficulty of removing imidacloprid (IMI) wastewater efficiently by a single treatment process. Micro-electrolytic ceramic substrates (MECS) were prepared from iron, activated carbon, aluminum, and fly ash and combined with an external power source to optimize the electrochemical and micro-electrolytic synergy and investigate their effectiveness in treating IMI wastewater. The results showed that MECS had a rough surface with a specific surface area of 2.682 m2/g, combining strong adsorption capacity (maximum adsorption of 1.149mg/g) and wear resistance (24h wear rate of 6.4%). The removal of total nitrogen (TN), total phosphorus (TP), and IMI by E-ME-SIS was stabilized at 99%, 98%, and 98%, respectively, at a current density (CD) of 0.625mA/cm2 and influent C/N (COD/N) = 5. This study significantly enhanced the removal of difficult-to-degrade pollutants by SIS through an electrochemically enhanced micro-electrolysis reaction, which provides an energy-saving and stable technical reference for the efficient treatment of IMI wastewater with a potential for engineering applications.

Purification of Intensive Shrimp Farming Effluent by Gracilaria Coupled with Oysters

In this study, we explored the ability of Gracilaria vermiculophylla coupled with Crassostrea hongkongensis to purify aquaculture effluent by analysing the purification of intensive shrimp farming effluent using G. vermiculophylla under different environmental conditions. After determining the optimal conditions, we further investigated the capability of the G. vermiculophylla and oyster coupling in intensive shrimp farming effluent purification. The shrimp farming density was 200 individuals per cubic metre (equivalent to 0.2 individuals per litre). The optimal environmental parameters were as follows: oyster biomass of 4.5 kg·m−3, G. vermiculophylla biomass of 2 kg·m−3, water temperature of 25–30 °C, and salinity of 15–30‰; the total inorganic nitrogen, PO43−-P, total nitrogen, and total phosphorus removal rates were 59.56%, 97.43%, 63.67%, and 76.25%, respectively, with G. vermiculophylla increasing in weight by 31.01%. For every 1 kg increase in the dry weight of G. vermiculophylla, 36.89 g of N and 12.40 g of P could be absorbed from the effluent. Our findings indicate that the coupling of G. vermiculophylla with oysters greatly contributed to the purification of effluent from intensive shrimp farming and can, thus, be used for treating intensive shrimp farming effluent.

Atypical removals of nitrogen and phosphorus with biochar-pyrite vertical flow constructed wetlands treating wastewater at low C/N ratio.

Atypical removals of nitrogen and phosphorus with biochar-pyrite vertical flow constructed wetlands treating wastewater at low C/N ratio.

Enhancing manganese redox-driven nitrogen removal by integrating manganese ore with microelectrolysis into constructed wetlands.

Enhancing manganese redox-driven nitrogen removal by integrating manganese ore with microelectrolysis into constructed wetlands.

High-efficiency nitrogen and phosphorus removal for low C/N rural wastewater using a full-scale multi-stage A2O biofilm reactor combined with horizontal-vertical flow constructed wetlands system.

High-efficiency nitrogen and phosphorus removal for low C/N rural wastewater using a full-scale multi-stage A2O biofilm reactor combined with horizontal-vertical flow constructed wetlands system.

Understanding the potential role of microbial electrolysis cells in promoting electron transfer and microbial metabolism during the drying period in treating metformin-containing wastewater with an adsorption-biological coupling system.

Understanding the potential role of microbial electrolysis cells in promoting electron transfer and microbial metabolism during the drying period in treating metformin-containing wastewater with an adsorption-biological coupling system.

Selective oxidation of aminotrismethylene phosphonate (ATMP) by UV-Cu (II)/H2O2 system: Performance and mechanism.

Selective oxidation of aminotrismethylene phosphonate (ATMP) by UV-Cu (II)/H2O2 system: Performance and mechanism.

Bio-electrochemically assisted sulfide, phosphorus, and nitrogen remediation in continuous anaerobic digestion of dairy manure with improved biogas production.

Bio-electrochemically assisted sulfide, phosphorus, and nitrogen remediation in continuous anaerobic digestion of dairy manure with improved biogas production.

Performance assessment of two horizontal-flow constructed wetlands for greywater treatment in Lebanon

ABSTRACT In response to the increasing pressures on the existing water resources in Lebanon, several constructed wetlands have been implemented across the country, showing promising results in water treatment. This experiment focuses on two newly completed constructed wetlands in the Bekaa Valley, assessing their efficiency in treating greywater and evaluating the potential of effluent reuse in irrigation or other non-potable applications. Influent and effluent samples were analyzed, and results showed removal of about 87–92% of total suspended solids (TSS), 65–68% of chemical oxygen demand (COD), 47–53% of biochemical oxygen demand (BOD), and a 59–76% of phosphorus. The results of this experiment were later compared against local and regional standards and case studies, which revealed comparable results for TSS and total phosphorus (TP) removal to other Lebanese, regional, and Mediterranean studies, as well as lower BOD and COD removal, highlighting the importance of further optimization. Future research should explore extended monitoring periods, plant maturity, and design adjustments to target the most stringent reuse standards. This study emphasizes the role of decentralized nature-based solutions (NBSs) for water treatment in regions with declining public water services.

Iron-carbon micro-electrolysis coupled to heterotrophic nitrification aerobic denitrification treating low carbon/nitrogen mariculture wastewater.

Iron-carbon micro-electrolysis coupled to heterotrophic nitrification aerobic denitrification treating low carbon/nitrogen mariculture wastewater.

Insight into the enhanced removal of dimethoate by ferrate(Ⅵ)/biochar system: Contributions of adsorption and active oxidants.

Insight into the enhanced removal of dimethoate by ferrate(Ⅵ)/biochar system: Contributions of adsorption and active oxidants.

Comprehensive Analysis of Oxidation Ditch and High-Efficiency Multi-Cycle A2/O Processes Performance in Urban Wastewater Treatment

Oxidation ditch and Anaerobic–Anoxic–Oxic (A2/O) processes have been applied in urban wastewater treatment plants for decades, but the differences between two processes in engineering applications are less studied. Based on the continuous monitoring of Ningyang’s sewage treatment plant (Shandong, China) for one year, this study systematically analyzed the removal efficiencies of nutrients in the oxidation ditch and the modified high-efficiency multi-cycle A2/O processes. The results showed that chemical oxygen demand (COD) and total phosphorus (TP) removal in the modified high-efficiency multi-cycle A2/O process of the Phase II project was better than that in the oxidation ditch process of the Phase I project, and the average concentration of COD and TP in the effluent was 49.9% and 51.7% lower than that in the oxidation ditch process, respectively. The removal rate of ammonia nitrogen (NH4+-N) by the two processes was basically the same, while the total nitrogen (TN) effluent concentration of the oxidation ditch process was 31.4% lower than that in the high-efficiency multi-cycle A2/O process. In summary, the high-efficiency multi-cycle A2/O process had a better treatment performance regarding nutrient removal than the oxidation ditch process under the same conditions. Furthermore, the engineering and operational costs of the high-efficiency multi-cycle A2/O process were lower.

National scale evaluation of nutrient purification capacity in marine sediments along the coast of South Korea: A mesocosm study based in situ assessment.

National scale evaluation of nutrient purification capacity in marine sediments along the coast of South Korea: A mesocosm study based in situ assessment.

Recyclable adsorbents of Fe and La co-modified clam shells for phosphorus removal from domestic sewage: Characterization and mechanisms.

This research focused on creating a recyclable magnetic adsorbent, termed La@Fe-CCS, which was modified with lanthanum (La) to improve its efficiency in removing phosphate. The process involved integrating lanthanum into an iron (Fe)-based clam shell matrix (Fe-CCS). This study showed that La@Fe-CCS demonstrated superior adsorption capabilities within a pH range of 3-8 compared to Fe-CCS. Coexisting ions and humic acid (HA) had limited effects. La@Fe-CCS also exhibited rapid adsorption kinetics, achieving equilibrium within 20min. It showed a theoretical maximum adsorption capacity of 43.61mg/g, which was substantially higher than that of Fe-CCS (5.79mg/g). XPS and FTIR analyses indicated that phosphate removal by La@Fe-CCS involves ligand exchange between surface hydroxyl groups and phosphate, as well as intrasphere complexation. In real domestic sewage, La@Fe-CCS achieved over 95% total phosphorus (P)removal. These results suggest that La@Fe-CCS is a highly efficient adsorbent for practical P remediation applications.

Porous polymers embedded with iron carbon enhanced densified activated sludge formation and wastewater treatment

Porous polymers embedded with iron carbon enhanced densified activated sludge formation and wastewater treatment

Re-granulation and performance of anaerobically digested bacterial and algal-bacterial aerobic granular sludge.

Re-granulation and performance of anaerobically digested bacterial and algal-bacterial aerobic granular sludge.

Adsorption of total phosphorus through polymeric filter media to improve the quality of effluent of UASB reactor

This study investigated the adsorption of total phosphorus (TP) using a fixed-bed column filled with polymeric filter media (PFM) made from chitosan-agarose cryogels. The column, 200 mm in length with an inner diameter of 20 mm, was packed with PFMs at varying bed heights of 100, 150, and 200 mm. The effluent from a UASB reactor, containing total phosphorus impurities (TP, 16 ± 0.6 mg/L), was passed through the column at these bed heights. A peristaltic pump regulated the flow rates between 100 and 500 mL/h, ensuring consistent flow through the PFM. The post-treatment of the UASB reactor effluent was most effective at a flow rate of 100 mL/h and a bed height of 200 mm, where a breakthrough time was extended, and the initial TP removal efficiency reached 87 ± 5.5% during the first hour, gradually decreasing over time. Kinetic analysis using the Thomas and Yoon-Nelson models demonstrated a good fit with the experimental data, both models showing strong correlation coefficients (R 2 > 0.8).

Continuous Flow Electrocoagulation System for Enhanced Phosphorous Removal in Decentralized Wastewater Treatment Systems

Decentralized wastewater treatment systems (DWTS) are significant contributors to the eutrophication of surface water bodies due to a lack of treatment mechanisms that target dissolved phosphorus removal. Existing advanced treatment systems are expensive to operate, large in nature, and require frequent maintenance, making them unattractive to DWTS owners. This study aims to investigate the development of a continuous flow treatment system that uses electrocoagulation (EC) to remove dissolved phosphorus from small wastewater streams such as septic tank effluent (STE). Operational parameters, including system hydraulic retention time (HRT), applied current density, and wastewater composition, were optimized to maximize total phosphorus (TP) removal most cost-effectively. Using an HRT of 10 min, an applied current density of 2.0 mA/cm2, and an influent concentration of 20 mg/L, the orthophosphate (OP) and TP removal percentages achieved were 99.9 and 88.1%, respectively. Under these conditions, the average effluent Al3+ concentration in the treated effluent was measured to be 1.0 mg/L while the total suspended solids concentration was measured to be 51 mg/L. The operation cost was estimated to be 0.056 CAD/m3. The results demonstrate that the EC reactor is effective in removing dissolved phosphorus from wastewater and is therefore a viable option in mitigating the risk of downstream eutrophication caused by inadequately treated STE.

Treatability evaluation for 3 MBR(Membrane Bioreactor) processes with total phosphorus removal facility by simulation

Treatability evaluation for 3 MBR(Membrane Bioreactor) processes with total phosphorus removal facility by simulation

EFFECT OF LOCALLY ISOLATED <i>SCENEDESMUS</i> SP. TN1 ON BIOMASS PRODUCTION AND NUTRIENT REMOVAL FROM COOKING COCOON WASTEWATER: EFFECTS OF INITIAL ALGAL CELL DENSITY AND TEMPERATURE

Scenedesmus sp. TN1, a local freshwater microalga, was cultivated in cooking cocoon wastewater. The effects of initial algal cell density and temperature on microalgae growth and the removal of total nitrogen (T-N), total phosphorus (T-P), and chemical oxygen demand (COD) were studied. The initial algal cell densities were 5, 10, 15, and 20 mg/l. The experimental temperatures varied from 20 °C to 30 °C. The growth rate increased with the increase in initial algal cell density up to 15 mg/l and was statistically stable thereafter. A similar trend of total nitrogen, total phosphorus, and COD removal efficiency was observed. The optimum temperature for microalgae growth and nutrient removal was 30 °C. After 9 days of cultivation, Scenedesmus sp. TN1 exhibited nutrient removal efficiencies of 88.28%, 82.91%, 92.01%, and 89.16% for T-N, T-P, biological oxygen demand (BOD5), and COD, respectively. The maximum biomass production and nutrient removal efficiencies of Scenedesmus sp. TN1 were observed at cultivation conditions of 15 mg/l initial algal cell density at 30 °C. This study compiled information on the cultivation conditions for cooking cocoon wastewater treatment practices.