Effect of aged nanoscale zero-valent iron amendment and capping on phosphorus mobilization in sediment

Phosphate recovery from water and wastewater serves as a feasible alternative to the exploitation of scarce phosphate rock resources. Currently, phosphate is recovered using adsorption-based techniques due to their desirable features, such as a low running cost, feasible operation, and high efficiency. Clay minerals (CMs), a group of earth-abundant resources, have attracted increasing interest in phosphate management. However, because the surface and crystal lattice of CMs are negatively charged, CMs are inefficient and have been replaced with cost-effective modified CMs (mCMs). This review comprehensively covers the current advances in mCM-mediated phosphate recovery. We first discussed the crystal features of natural CMs and the diverse techniques used for mCMs to enhance their phosphate-removal capacity. Subsequently, we covered the processes of mCM-driven phosphate management, namely, ion exchange, hydrogen bonding, crystallization, Lewis acid-base interactions, electrostatic interactions, precipitation, and electrostatic-ligand exchange. Further assessments revealed that mCMs can efficiently remove phosphate through multiple synergistic mechanisms. This review also discussed the effects of anions, humic acids, and cations on the mCMs management of phosphate and analyzed mCMs applications in various water environments, specifically, phosphate passivation materials in lake sediments and the phosphate management of municipal/seawater wastewater. We examined the reutilization of phosphate-loaded mCMs in agriculture from a circular economy perspective, and finally discussed the commercial application prospects of mCMs in environmental pollution remediation, which may help to avert the global phosphate-resource crisis and improve wastewater management. 

Comprehensive review of modified clay minerals for phosphate management and future prospects

Interception of phosphorus release from sediment by magnetite/lanthanum carbonate co modified activated attapulgite composite: performance and mechanism

Combination of lanthanum-modified attapulgite and Vallisneria natans for immobilization of phosphorus in various types of sediments

The vast majority of processes in the carbon and nitrogen cycles are driven by microorganisms. The nitrite-dependent anaerobic oxidation of methane (N-DAMO) process links carbon and nitrogen cycles, offering a novel approach for the simultaneous reduction of methane emissions and nitrite pollution. However, there is currently no comprehensive summary of the current status of the N-DAMO process in natural aquatic environments. Therefore, our study aims to fill this knowledge gap by conducting a comprehensive review of the global research trends in N-DAMO processes in various aquatic environments (excluding artificial bioreactors). Our review mainly focused on molecular identification, global study sites, and their interactions with other elemental cycling processes. Furthermore, we performed a data integration analysis to unveil the effects of key environmental factors on the abundance of N-DAMO bacteria and the rate of N-DAMO process. By combining the findings from the literature review and data integration analysis, we proposed future research perspectives on N-DAMO processes in global aquatic environments. Our overarching goal is to advance the understanding of the N-DAMO process and its role in synergistically reducing carbon emissions and removing nitrogen. By doing so, we aim to make a significant contribution to the timely achievement of China's carbon peak and carbon neutrality targets. 

Nitrite-dependent anaerobic methane oxidation (N-DAMO) in global aquatic environments: A review.

Organic matter was increased due to the input of plant litter, resulting in changes in the physicochemical properties and enhancement of greenhouse gas (GHG) emissions in water bodies. There are few reports on effects of decomposition of aquatic plants on GHGs emissions. This study investigated the effects of the degradation of two aquatic plants, Potamogeton crispus and Typha orientalis Presl, upon release of CO2 and CH4 at the sediment–water interface. During early decomposition, the release of CO2 and CH4 at the sediment–water interface was increased by the degradation of the two aquatic plants, and release flux of CO2 and CH4 were increased rapidly at first and then decreased. Due to the differences in properties of C, lignin, cellulose and other components of the plants, the Potamogeton crispus group obtained higher abundance of genes relevant to CO2 and CH4 metabolism, which leads to the increase of CO2 and CH4 emissions compared with that of the Typha orientalis Presl. In addition, dissolved oxygen and pH were decreased due to the decomposition of organic matter in the plant residues at the sediment–water interface, resulting in growth of anaerobic microorganisms. The increase of the relative abundance of anaerobic microorganisms promoted the decomposition of organic matter in the sediment and the enhancement of cell respiration, promoting the release of CH4 and CO2 during the decomposition of aquatic plants. 

Effects of Decomposition of Submerged Aquatic Plants on CO2 and CH4 Release in River Sediment–Water Environment

Sulfate reduction promotes the release of organic phosphorus and iron-bound phosphorus in black-odor sediments in response to increased temperatures

Phosphorus (P) inactivation agents have been widely used to control sediment P release for combating lake eutrophication. The settlement and decomposition of algal biomass from the overlying water can alter the microenvironment of the capping layer and potentially affect the performance of P inactivation agents. In this study, we explored the impacts of algal decomposition on the performance of lanthanum/aluminum comodified attapulgite (LAA), a commonly used P inactivation agent, and the underlying mechanisms through incubation experiments. The results showed that algal settlement and decomposition could inactivate LAA. After algal settlement, the amount of P locked in the LAA decreased by 11.8% relative to the control. Algal decomposition induced anoxia in the capping layer of LAA, which favored the growth of phosphate-solubilizing bacteria, thereby enhancing P release; meanwhile, driven by algal decomposition, more organic matter penetrated the capping layer and competed with P adsorption sites. The increased desorption ability and decreased adsorption ability inhibited the performance of LAA, increasing the P permeability of the capping layer. This study provides beneficial information for future field applications of P inactivation agents for lake restoration. 

/pdf/algal-settlement-inactivates-lanthanum-aluminum-comodified-lw44ynbw.pdf

Algal Settlement Inactivates Lanthanum/Aluminum Comodified Attapulgite: Implications for Phosphorus Control in Shallow Lakes

Synchronous effect of increasing oxygen and inhibiting phosphorus release from heavily polluted sediment by applying a novel oxygen micro-nano-bubble material

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