Phosphate-Solubilizing Capacity of PSF7 and Optimization Using Response Surface Methodology.

Phosphorus-solubilizing microorganisms release organic acids that can chelate mineral ions or reduce the pH to solubilize insoluble phosphates for use by plants; it is important to study potential phosphorus-solubilizing microorganisms for use in agriculture. In this study, PSF7 was isolated from the soil of the Wengfu Phosphorus Tailings Dump in Fuquan City, Guizhou Province, China. PSF7 was identified as based on morphological characterization and ITS sequencing analysis.

Efficient decomposition of perfluorooctane sulfonate by electrochemical activation of peroxymonosulfate in aqueous solution: Efficacy, reaction mechanism, active sites, and application potential.

The electrochemical oxidation method is a promising technology for the degradation of perfluorooctane sulfonate (PFOS). However, the elimination processes of PFOS are still unknown, including the electron transfer pathway, key reactive sites, and degradation mechanism. Here, we fabricated diatomite and cerium (Ce) co-modified SbO (D-Ce/SbO) anode to realize efficient degradation of PFOS via peroxymonosulfate (PMS) activation.

Exploration of perfluorooctane sulfonate degradation properties and mechanism via electron-transfer dominated radical process.

Polyfluoroalkyl and perfluoroalkyl chemicals (PFCs) widely used in lubricants, surfactant, textiles, paper coatings, cosmetics, and fire-fighting foams can release a large deal of organics contaminants into wastewater and pose great risks to the health of humans and eco-environments. Although advanced oxidation processes can effectively deconstruct various organic contaminants via reactive radicals, the stable structure of PFCs makes it difficult to be degraded. Here, we confirm that electrochemical oxidation process coupled with peroxymonosulfate (PMS) reaction can efficiently destroy stable structure of PFCs via electron transfer and meanwhile completely degrade PFCs via generated active radicals.

Exploring key reaction sites and deep degradation mechanism of perfluorooctane sulfonate via peroxymonosulfate activation under electrocoagulation process.

Perfluorooctane sulfonate (PFOS), normally present in groundwater and surface water, is an emerging environmental contaminants, but is extremely difficult to be degraded due to high energy of the C-F bond. Here, an electrocoagulation (EC) technique coupled with peroxymonosulfate (PMS) activation was used to deeply degrade PFOS. Results showed that approximately 100% PFOS was removed from the solution in the monopolar serial (MS) mode within 60 min and achieved a high kinetic rate of 0.

Spraying carbon powder derived from mango wood biomass as high-performance anode in bio-electrochemical system.

Microbial fuel cell is a green and sustainable bio-electrochemical system that can harvest bioelectricity from organic matter conversion by bacteria in wastewater, but weak electrochemical activity and poor biocompatibility between electro-active bacteria and anode limit its scale-up application. In the present, the biomass carbon derived from mango wood was prepared via one-step carbonization method for anode materials in microbial fuel cell. A desirable anode C/1050 with large electrochemical active surface area (75.

Improved cathodic oxygen reduction and bioelectricity generation of electrochemical reactor based on reduced graphene oxide decorated with titanium-based composites.

A kind of reduced graphene oxide decorated with titanium-based (RGO/TiO) composites are successfully synthesized and employed in this current study as a novel nonprecious metal catalyst for enhancing bioelectricity generation and cathodic oxygen reduction reaction (ORR) in single chamber microbial fuel cells (MFCs). Compared with commercial Pt/C, RGO/TiO shows obviously enhanced oxygen reduction reaction activity due to the appropriately-permeated, large electrochemical active area, enough exposure of electrocatalytic active sites of RGO/TiO. The air-cathode MFC with RGO/TiO-1 cathode achieves 1786.

[ANAMMOX Reactor with Two Kinds of Inoculated Sludge: Start-up and Kinetics Characteristics].

Two different mixed sludges (aerobic nitrifying sludge and ANAMMOX-denitrification sludge:R1, and anaerobic digestion flocculent sludge and ANAMMOX-denitrification sludge:R2), were used as inocula in two UBF reactors to enrich Anammox bacteria. Both kinds of mixed sludge set up the Anammox process successfully. It took 36 days for R1, while R2 required 53 days.

[Preparation of PAAm/HACC Semi-Interpenetrate Network Hydrogel and Its Adsorption Properties for Humic Acid from Aqueous Solution].

New absorbents, polyacrylamide/chitosan quaternary ammonium salt semi-interpenetrate network hydrogels[(PAAm/HACC semi-IPN), (s-IPN 1.5), and (s-IPN 3)], were successfully prepared via in situ polymerization by thermal synthesis for the removal of humic acid (HA) from aqueous solution. The materials were characterized by SEM, FT-IR, and XRD.

[Adsorption Performance and Mechanism of HZO@SGH for the Removal of Fluoride from Aqueous Solution].

Three-dimensional porous composites based on hydrous zirconium oxide and self-assembled graphene hydrogels (HZO@SGH) were successfully synthesized via homogeneous precipitation. HZO@SGH was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) to investigate the morphology and the defluoridation mechanism. The adsorption performance and mechanism of HZO@SGH for fluoride was investigated via batch adsorption experiments.

Antioxidative responses of Pseudomonas fluorescens YZ2 to simultaneous exposure of Zn and Cefradine.

Binary pollution of both heavy metals and antibiotics has received increasing attentions for their joint effects of eco-toxicity and health hazards. To reveal the effects of mixtures of different pollutants on bacterial antioxidant response system, Pseudomonas fluorescens ZY2, a new strain isolated from swine wastewater, was chosen to determinate growth (bacterial density OD600), reactive oxygen species (ROS) concentration, protein concentration and superoxide dismutase (SOD) activity under exposure treatments of Zn, Cefradine or Zn + Cefradine. Bacterial densities of all the treatment groups increased significantly over the incubation time, but those containing pollutant addition were slightly lower than the control at different times of incubation.

Size distribution and leaching characteristics of poly brominated diphenyl ethers (PBDEs) in the bottom ashes of municipal solid waste incinerators.

The particle size distributions and leaching characteristics of polybrominated diphenyl ethers (PBDEs) in the bottom ashes of two Taiwanese municipal solid waste incinerators (MSWIs A and B) were investigated to evaluate PBDE leaching into the environment through reutilization of bottom ashes. The PBDE contents in the bottom ashes of the MSWIs (29.0-243 ng/g) could be two orders higher than those in rural and urban soils.

[Leaching kinetics of josephinite tailings with sulfuric acid].

Leaching is the most important step of josephinite tailing recycle technology. This step can separate the valuable metal Mg from Si and other impure metal. Effects of sulfuric acid on leaching Mg efficiency from josephinite tailings were investigated.

[Degradation kinetics of activated carbon catalyzed persulfate oxidation orange G].

The oxidation degradation of orange G (OG) in aqueous solutions by the activated carbon catalyzed peroxydisulfate (PDS) has been kinetically investigated. These processes are based on the generation of sulfate radicals, which are powerful oxidizing species found in nature. The results demonstrated that OG could be degraded by GAC/PDS reagent effectively.

[Study on kinetics of photoelectrocatalytic degradation of supported TiO2 on malachite green].

La-N co-doped TiO2 photocatalyst was synthesized by a sol-gel method, which used tetrabutyl titanate (TBOT) as the Ti resource, lanthanum nitrate as the La resource and urea as the N resource. The performance in the photocatalytic oxidation degradation of malachite green was investigated. The results showed that the reaction could be reasonably represented by first order kinetics, and a kinetic model was established; the reaction order of voltage (0.

[Photoelectrocatalytic degradation kinetics of malachite green by Pr-N co-doped TiO2 photocatalyst].

Malachite green oxidation degradation was kinetically investigated in a photoelectrocatalytic reactor, using Pr-N co-doped TiO2 photocatalyst as the electrode which was prepared by a sol-gel method. The result shows that the initial concentration, pH, voltage and temperature had a significant impact on the oxidation rate. The kinetic equation for malachite green oxidation under the conditions of 10-30 mg x L(-1) of initial concentration, 3-8 of pH, 1-5 V of voltage, 298-338 K of temperature could be described using the first order kinetics, which was fitted well with the experimental data.

[Degradation kinetics of ozone oxidation on high concentration of humic substances].

Humic substance oxidation (HS) degradation by ozone was kinetically investigated. The effects of O3 dosage, initial pH, temperature and initial concentration of HS were studied. Under the conditions of 3.

[Degradation kinetics of ozone oxidation on landfill leachate rejected by RO treatment].

This study kinetically investigated landfill leachate rejected by reverse osmosis (RO) oxidation degradation by ozonation. Initial pH, ozone dosage, temperature and initial COD had significant impact on the oxidation rate. The results demonstrated that for the removal efficiencies of COD 67.

[Utilizing the wastewater treatment plant sludge for the production of eco-cement].

The aim of this paper was to study the effect on cement property by using of municipal sewage as additive in the process of clinker burning. Based on the standard sample P. 042.

[Kinetics of humic substances oxidation degradation by Fenton's reagent].

Humic substances (HS) oxidation degradation by Fenton's reagent was kinetically investigated in this study. HS was removed by both oxidation and coagulation during Fenton treatment. Moreover, initial pH, the dosage of Fenton's reagent and initial concentration of HS had a significant impact on HS oxidation rate and the oxidation mainly occurred at the first 60 min of reaction time.

[Removal of humic acids by oxidation and coagulation during Fenton treatment].

Simulated high concentration humic acids (HA) wastewater was treated by Fenton process. The influence of reaction time, initial pH, H2O2 and Fe2+ dosage on the reduction results of COD, TOC, UV254, A400 are presented. The changes of mean oxidation state (eta), A465/A665, the ratio of COD removal by oxidation to that by coagulation (phi) and Zeta potential (zeta) were used to evaluate the roles of oxidation and coagulation in reducing HA during Fenton treatment.

[Characteristics of nitrogen removal in SBR for the mature landfill leachate treatment].

Characteristics of biological nitrogen removal for the treatment of a mature landfill leachate with a 1200 m3 sequencing batch reactor (SBR) was investigated. The results indicate that obvious enhancement of nitrogen removal in the SBR treating landfill leachate was obtained by adding fecal supernatant to modulate the C/N ratio. The total nitrogen (TN) removal efficiency was found high up to 82.

Advanced treatment of landfill leachate by a new combination process in a full-scale plant.

Advanced treatment of mature landfill leachate from a municipal landfill located in southern China (Jiangmen) was carried out in a full-scale plant using a new process. The combined process has a sequencing batch reactor (SBR) serving as the primary treatment, with polyferric sulfate (PFS) coagulation coupled with a Fenton system as secondary treatment, and a pair of upflow biological aerated filters (UBAFs) in parallel as tertiary treatment. The overall removal efficiency of chemical oxygen demand (COD) in this process was 97.

[Fenton oxidation cooperated with PFS coagulation and SBR for deepen treating a mature landfill leachate].

The method of Fenton oxidation cooperated with PFS coagulation and SBR for deep treating aged landfill leachate was investigated. The deep treatment based on the effluent need reach the landfill leachate national discharge standard I , and lower operating costs. Under the influent condition of COD concentration 640 mg x L(-1) and chroma 500, the optimal reaction conditions of Fenton oxidation cooperated with PFS coagulation were recommended.

[Microecology of the anaerobic ammonium oxidation reactor].

The microbial community structure and biodiversity in the ANAMMOX system were studied by applying the methods of microtechnic, separation and purification technology of microorganisms, and molecular biotechnology. The ANAMMOX microbial population in an upflow anaerobic sludge blanket (UASB) bioreactor and a UASB-biofilm bioreactor was successfully enriched in the laboratory with inorganic and dark condition. The removal efficiencies of NH4+-N and NO2(-)-N in UASB reactor were 99.

[Research of the second start-up in USAB-ANAMMOX reactor with landfill leachate].

The second start-up of anaerobic ammonium oxidation (ANAMMOX) process with landfill leachate was investigated. It works after the ANAMMOX bacteria in the UASB-ANAMMOX reactor have been fully restrained by temperature and influent. The results reveal that the second start-up was faster, and the removal of NH4(+) -N and NO2(-) -N was up to 96.