Effect of Wastewater on the Composition of Bacterial Microbiota of Used in Constructed Wetlands for Phytodepuration.

Phytodepuration occurs in the plant-mediated remediation processes exploited to remove pollutants from wastewater, and is one of the most used plants. This goal is achieved using constructed wetlands (CW), which are engineered systems designed to mimic the natural processes of pollutants removal. The aim of this work was to characterize the bacterial communities associated to , soils, and permeates of the CW of Calice (Prato, Italy), to evaluate the possible effect of wastewaters on the CW bacterial communities, through a next-generation sequencing-based approach.

Antibacterial activity of bacteria isolated from against multidrug-resistant human pathogens.

Rising number of multidrug-resistant human pathogens demands novel antibiotics: to this aim, unexplored natural sources are investigated to find new compounds. In this context, bacteria associated to medicinal plants, including , might represent an important source of antimicrobial compounds. In the present work, 21 bacterial endophytes isolated from roots were tested, by cross-streaking, for their inhibitory activity against 36 multidrug-resistant pathogens isolated from food, clinical patients and hospitals.

Closing the loop in a constructed wetland for the improvement of metal removal: the use of Phragmites australis biomass harvested from the system as biosorbent.

Among the numerous clean-up techniques for water treatment, sorption methods are widely used for the removal of trace metals. Phragmites australis is a macrophyte commonly used in constructed wetlands for water purification, and in the last decades, its use as biosorbent has attracted increasing attention. In view of a circularly economy approach, this study investigated improvement of trace metal removal by recycling the biomass of P.

Temporal Evolution of Bacterial Endophytes Associated to the Roots of Exploited in Phytodepuration of Wastewater.

Improvement of industrial productions through more environment-friendly processes is a hot topic. In particular, land and marine environment pollution is a main concern, considering that recalcitrant compounds can be spread and persist for a long time. In this context, an efficient and cost-effective treatment of wastewater derived from industrial applications is crucial.

Optimization of a large industrial wastewater treatment plant using a modeling approach: A case study.

The objective of this paper is to find the optimum solid retention time (SRT) of a wastewater treatment plant (WWTP), which minimizes operating costs, using a modeling approach with WEST software by MIKE DHI®. For the determination of the kinetic and stoichiometric parameters (used for the correct calibration of the model implemented), respirometric and kinetic batch tests were carried out. Each Oxidation ditch was modeled by a sequence of four aerated activated sludge units (ASUs) and four anoxic ASUs with recirculation.

Removal efficiency and mass balance of polycyclic aromatic hydrocarbons, phthalates, ethoxylated alkylphenols and alkylphenols in a mixed textile-domestic wastewater treatment plant.

In this work the occurrence and fate of polycyclic aromatic hydrocarbons (PAHs), phthalic acid esters (PAEs), mono and diethoxylate alkylphenols (APEOs) and alkylphenols (APs) have been investigated during a two-weeks period in a facility treating mixed textile-domestic wastewater (Prato, Italy). The wastewater treatment plant (WWTP) consists of primary sedimentation, activated sludge biological oxidation, secondary sedimentation, clariflocculation and ozonation. The sludge is treated within the facility by thickening, dewatering and final incineration, thus providing the almost quantitative removal of the adsorbed micropollutants.

Design and start-up of a constructed wetland as tertiary treatment for landfill leachates.

In this paper, the design and start-up of a constructed wetland (CW) for the tertiary treatment of landfill leachates is presented. The flux is characterized by high salinity, high concentration of nitrogen (almost completely in the form of nitrate) and a biochemical oxygen demand (BOD)/chemical oxygen demand (COD) ratio close to zero. The CW pilot plant suffered from mechanical and hydraulic malfunctions which led to an uneven growth of plants inside the tanks.

Long-Term Performance of a Full-Scale Membrane Plant for Landfill Leachate Pretreatment: A Case Study.

This paper presents a case study describing a full-scale membrane bioreactor (MBR) for the pretreatment of landfill leachates. The treatment train includes an aerated equalization tank, a denitrification tank, an oxidation/nitrification tank, and two ultrafiltration units. The plant has worked continuously since 2008 treating landfill leachates at a flux of 2⁻11 L·h·m.

Nanotechnologies for Removal of Pharmaceuticals and Personal Care Products from Water and Wastewater. A Review.

The occurrence of pharmaceuticals and other hazardous substances in surface waters and drinking water and the long-term exposure may represent a potential risk for both the environment and human health. Many studies have evidenced that conventional technologies used for wastewater treatment do not completely remove pharmaceuticals and personal care products (PPCPs) residues, which can be detected in receiving waters at concentrations ranging from few ng L(-1) until more than μg L(-1). Nanomaterials are of fundamental importance in the current research efforts to develop more efficient water treatment and remediation systems in place of conventional technologies.

Distribution and mass balance of hexavalent and trivalent chromium in a subsurface, horizontal flow (SF-h) constructed wetland operating as post-treatment of textile wastewater for water reuse.

In this study, during a two-year period, we investigated the fate of hexavalent and trivalent chromium in a full-scale subsurface horizontal flow constructed wetland planted with Phragmites australis. The reed bed operated as post-treatment of the effluent wastewater from an activated sludge plant serving the textile industrial district and the city of Prato (Italy). Chromium speciation was performed in influent and effluent wastewater and in water-suspended solids, at different depths and distances from the inlet; plants were also analyzed for total chromium along the same longitudinal profile.

Characterization of 4-nonylphenol-degrading bacterial consortium obtained from a textile wastewater pretreatment plant.

4-Nonylphenol (4-NP) isomers are toxic and recalcitrant compounds often resulting, together with short-chain ethoxylated nonylphenol (NPnEO, where n is the number of ethylene oxide units), from NPnEO biodegradation in conventional activated sludge plants. In this work, a microbial consortium, defined as Consortium A, capable of removing 100 mg/L of 4-NP with no accumulation of metabolites with aromatic moiety was isolated from textile wastewaters after enrichment with 4-NP. The consortium showed remarkable degradation activities toward several short-chain NPnEO congeners.

Aggregation-based cooperation during bacterial aerobic degradation of polyethoxylated nonylphenols.

Three bacterial strains were isolated from activated sludge samples of two treatment plants receiving domestic and industrial wastewaters containing polyethoxylated nonylphenols. One strain (VA160) was isolated on rich medium, and the other two (BCaL1 and BCaL2) on mineral medium containing two industrial mixtures of nonylphenol ethoxylates as the sole carbon source. Strain VA160 was a Gram-positive, spore forming, filamentous bacterium, producing aggregates during growth in liquid medium.