Highly efficient removal of Sb(V) from water by franklinite-containing nano-FeZn composites

The existence of toxic and carcinogenic pentavalent antimony in water is a great safety problem. In order to remove antimony(V) from water, the purpose of this study was to prepare a novel graphene nano iron zinc (rGO/NZV-FeZn) photocatalyst via hydrothermal method followed by ultrasonication. Herein, weakly magnetic nano-Fe–Zn materials (NZV-FeZn, GACSP/NZV-FeZn, and rGO/NZV-FeZn) capable of rapid and efficient Sb(V) adsorption from water were prepared and characterised. In particular, rGO/NZV-FeZn was shown to comprise franklinite, Fe0, and graphite. Adsorption data were fitted by a quasi-second-order kinetic equation and Langmuir model, revealing that among these materials, NZV-FeZn exhibited the best Sb removal performance (543.9 mgSb gNZV-FeZn−1, R2 = 0.951). In a practical decontamination test, Sb removal efficiency of 99.38% was obtained for a reaction column filled with 3.5 g of rGO/NZV-FeZn. Column regenerability was tested at an initial concentration of 0.8111 mgSb L−1, and the treated water obtained after five consecutive runs complied with the GB5749-2006 requirement for Sb. rGO/NZV-FeZn was suggested to remove Sb(V) through adsorption-photocatalytic reduction and flocculation sedimentation mechanisms and, in view of its high cost performance, stability, and upscalable synthesis, was concluded to hold great promise for source water and wastewater treatment.

Study on the Effect of Flow Velocity on the Denitrification of Groundwater

Using the mixed filling reaction column, this article examines that the influence of different inlet flow rate on the removal of nitrate nitrogen in groundwater, respectively by 90mL/h, 150 mL/h, 210mL/h velocity, under 30 °C each run five days, comparativly studies the influence of velocity on denitrification. The results show that the flow rate has an important effect on the denitrification of water, when the water inlet velocity decreased from 150mL/h to 90mL/h, the concentration of nitrate nitrogen reaction column effluent decreased gradually, and the denitrification of nitrite nitrogen accumulation system has been in a low level, but the ammonia nitrogen accumulation only in the flow rate of 90mL/h, began when the flow rate decreased significantly; also increased from 90mL/h to 210mL/h, the effluent nitrate nitrogen concentration, nitrite nitrogen concentration and ammonia nitrogen concentration increased significantly.

Non-thermal Plasma Technology for Methylene Blue Decolorization in Continuous and Circulating System: Kinetic Model and Reactor Performance

This study described methylene blue (MB) decolorization in continuous and circulating electrical plasma system constituted by an airtight plasma reactor and subsequent reaction column. The preferable parameters in continuous mode were input voltage of 45 kV, gas flow rate of 40 L h

The Impact Analysis of Bearing Capacity of Steel Reaction Column on Eccentric Problems in Integrally Lifting of Yuzhen Palace

Based on Yuzhen palace integral lifting engineering of Wudang Mountain, the writer uses the finite element analysis to simulate bearing capacity of section steel column in the bidirectional eccentricity. The finite element data is slightly larger than the test, but the date keep in same value in the main. During the process of the integral lifting, the bearing capacity of steel column will sharply decrease with the bidirectional eccentricity increasing and produce torsion; it has a lethal effect on the whole upper structure. And the writer analyzes the problem that how to avoid the eccentric problems from two aspects of the design and construction, and the writer proposes some relevant suggestions and opinions. It can provide reference that how to design and construction in a similar project.

Electrical Plasma Technology for Dye Decolorization in a Continuous Reactor System

An airtight gas electrical plasma reactor was designed with subsequent reaction column to estimate performance of this treatment operating in continuous mode for the remediation of wastewater contaminated by organic dye. It was found that subsequent reaction column contributed great for final dye removal because generated ozone was sufficiently utilized in this system and decolorization behaviors in continuous processes were fitted well with first-order kinetic model.And operating under the conditions of input voltage 45kV, gas flow rate 40 L/h, virgin liquid conductivity and unmodified initial pH, the decolorization efficiencies were, at liquid flow rate of 1.5 L/h, 99.7% for 10 mg/L, 99.5% for 20 mg/L, 97.3% for 30 mg/L and 96.7% for 40 mg/L.

The Test Study of H-Section Steel Reaction Column Mechanical Performance in the Integral Lifting of Yuzhen Palace

During the Yuzhen palace of Wudang mountain integral lifting project, the writer tests the mechanical performance of H-section steel reaction column in the case of initial small eccentricity. The writer gathers and analyzes the strain data of H-section steel reaction column, including the local strain and local strength, load - displacement relationship of H-section steel reaction column in different lifting pressure. The results show that the local strain and local strength, load - displacement change present a curve of H-section steel reaction column increase trend with the lifting pressure and initial eccentricity increase. But the whole stress reaction column is in the permitted range. It could provide reference for the reaction structure choosing in the lifting engineering.