Eutrophication of water bodies is a serious and widespread environmental problem. Achieving low levels of phosphate concentration to prevent eutrophication is one of the important goals of the wastewater engineering and surface water management. Meeting the increasingly stringent standards is feasible in using a phosphate-selective sorption system. This critical review discusses the most fundamental aspects of selective phosphate removal processes and highlights gains from the latest developments of phosphate-selective sorbents. Selective sorption of phosphate over other competing anions can be achieved based on their differences in acid-base properties, geometric shapes, and metal complexing abilities. Correspondingly, interaction mechanisms between the phosphate and sorbent are categorized as hydrogen bonding, shape complementarity, and inner-sphere complexation, and their representative sorbents are organic-functionalized materials, molecularly imprinted polymers, and metal-based materials, respectively. Dominating factors affecting the phosphate sorption performance of these sorbents are critically examined, along with a discussion of some overlooked facts regarding the development of high-performance sorbents for selective phosphate removal from water and wastewater.

Selective Phosphate Removal from Water and Wastewater using Sorption: Process Fundamentals and Removal Mechanisms.

Layered double hydroxide intercalated with aromatic acid anions for the efficient capture of aniline from aqueous solution.

Enhanced bioreduction of iron and arsenic in sediment by biochar amendment influencing microbial community composition and dissolved organic matter content and composition.

Trends in the recovery of phosphorus in bioavailable forms from wastewater

Utilization of biochar for the removal of nitrogen and phosphorus

Highly selective adsorption of phosphate by pyromellitic acid intercalated ZnAl-LDHs: Assembling hydrogen bond acceptor sites

Microcosm experiments were conducted to investigate the mechanism of microbial-mediated As mobilization from high arsenic tailing sediments amended with nanoparticles (NPs). The addition of SiO2 NPs could substantially stimulate arsenic mobilization in the sodium acetate amendment sediments. However, the addition of Fe2O3 and Fe3O4 NPs restrained arsenic release because these NPs resulted in Fe–As coprecipiate. Moreover, NP additions in sediments amended with sodium acetate as the electron donor clearly promoted microbial dissimilatory iron reduction. Nearly 4 times the Fe(II) (11.67–12.87 mg·L–1) from sediments amended with NPs and sodium acetate was released compared to sediments amended with only sodium acetate (3.49 mg·L–1). Based on molecular fingerprinting and sequencing analyses, the NP additions could potentially change the sediment bacterial community composition and increase the abundance of Fe(III) and As(V) reduction bacteria. Several potential NP-stimulated bacteria were related to Geobacter,...

Role of nanoparticles in controlling arsenic mobilization from sediments near a realgar tailing.

Five types of biochars were prepared through chemical activation utilizing fermentation residue from biogas plants. NaOH, KOH, H2SO4, H3PO4 and ZnCl2 were used as chemical activating agents. Biochars could absorb ammonia-nitrogen in biogas slurry. Biochar derived from KOH treatment (KOH-CC) showed better adsorption efficiency than the others. The adsorption process followed pseudo-second-order kinetics, and the adsorption isotherm could be fitted to Langmuir equation. Simulation test indicated that the maximum adsorption capacity could reach 120 mg·g. The properties of KOH-CC were characterized by BET, SEM, XRD and FTIR. The machanism of ammonia-nitrogen adsorption was discussed.

Preparation of biochars from biogas residue and adsorption of ammonia-nitrogen in biogas slurry

The invention provides a preparation method of a modified biogas residue ammonium-nitrogen adsorption agent, and relates to the ammonium-nitrogen adsorption agent. The preparation method comprises the following steps of (1) crushing the dehydrated and dry biogas residue, and screening the crushed biogas residue by a sieve to obtain the biogas residue particles; (2) mixing the biogas residue particles with potassium hydroxide solution, standing the mixed solution, and removing and drying a reaction product of a supernatant; and (3) heating and pyrolyzing the dried product in a nitrogen atmosphere, cooling the product, washing the product by utilizing hydrochloric acid, washing the product by utilizing hot deionized water to be neutral, drying the product, and crushing, grinding and filtering the dried product to obtain the modified biogas residue ammonium-nitrogen adsorption agent. The biogas residue is modified to be made into the adsorption agent with a coarse surface and a mesoporous structure, and the prepared adsorption agent is used for adsorbing ammonium and nitrogen in biogas slurry. The prepared modified biogas residue ammonium-nitrogen adsorption agent has the advantages of low cost, excellent adsorption performance and the like.

Preparation method of modified biogas residue ammonium-nitrogen adsorption agent

https://doi.org/10.1097/md.0000000000028958

Qiangqiang Yu

Papers

Highly selective adsorption of phosphate by pyromellitic acid intercalated ZnAl-LDHs: Assembling hydrogen bond acceptor sites

Role of nanoparticles in controlling arsenic mobilization from sediments near a realgar tailing.

Preparation of biochars from biogas residue and adsorption of ammonia-nitrogen in biogas slurry

Preparation method of modified biogas residue ammonium-nitrogen adsorption agent

Efficacy of Yiqi Wenyang Huoxue method in treating adult bronchial asthma