scholarly journals Research of Disperse Composition of Air-and-Water Mix Generated by Ejector Aeration System During Wastewater Floatation Treatment

2016 ◽  
Vol 5 (4) ◽  
pp. 38-44 ◽  
Author(s):  
Ксенофонтов ◽  
Boris Ksyenofontov ◽  
Антонова ◽  
E. Antonova
Keyword(s):  
Water Treatment ◽  
High Performance ◽  
Waste Water Treatment ◽  
Experimental Studies ◽  
Average Diameter ◽  
Gas Content ◽  
Geometrical Parameters ◽  
Disperse Composition ◽  
Disperse Structure ◽  
Aeration System

The process of waste water treatment by floatation using ejector system of aeration has been considered in this paper. The system’s main shortcoming has been noted: receipt of large bubbles with a diameter about 1 mm, that not always allows get a high performance of cleaning. It has been noted that the most effectively the process of floatation treatment for industrial sewage from fine pollutions is performed when the bubbles’ sizes are less than 100 microns, and when there is a big range of pollutions in water it is reasonable to receive the bubbles with a wide disperse structure. The carried-out overview of Russian and foreign sources has demonstrated that the main shortcomings of existing dispersion devices used for crushing of the bubbles generated by the ejector is insufficient dispersion extent in case of low gas content, work instability, technology complexity. For sewage treatment process intensification and remedial action of the existing devices has been offered a combined aeration system consisting of ejector and original dispersing device. On laboratory installation have been conducted experimental studies on determination of disperse composition for air-and-water mix generated by the offered aeration system. The received results confirm a possibility for receipt of fine bubbles in the range of 20–300 microns with a degree of bubbles of fraction less than 100 microns up to 80 %, and with an average diameter of 60–80 microns. A feature of the bubbles’ disperse structure has been noted: allocation from it several groups of bubbles with different values of average diameters. This feature can be used for intensification of process for water treatment from pollutions with various floatability degrees. Dependences of researched characteristics on dispersant’s diameter and height have been presented. They allow perform a choice of dispersant’s geometrical parameters for receipt of the air-and-water mix’s required disperse composition aimed to management of floatation process.

Stirring and aeration system for the upgrading of small waste water treatment plants

1994 ◽  
Vol 29 (12) ◽  
pp. 149-156 ◽  
Author(s):  
Marcus Höfken ◽  
Katharina Zähringer ◽  
Franz Bischof
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Large Scale ◽  
Waste Water Treatment ◽  
Water Treatment Plants ◽  
Waste Water Treatment Plants ◽  
Basic Fluid ◽  
Aeration System ◽  
Technical Realization ◽  
Wide Range

A novel agitating system has been developed which allows for individual or combined operation of stirring and aeration processes. Basic fluid mechanical considerations led to the innovative hyperboloid design of the stirrer body, which ensures high efficiencies in the stirring and the aeration mode, gentle circulation with low shear forces, excellent controllability, and a wide range of applications. This paper presents the basic considerations which led to the operating principle, the technical realization of the system and experimental results in a large-scale plant. The characteristics of the system and the differences to other stirring and aeration systems are illustrated. Details of the technical realization are shown, which conform to the specific demands of applications in the biological treatment of waste water. Special regard is given to applications in the upgrading of small compact waste water treatment plants.

High Performance and N & P-Removable On-Site Domestic Waste Water Treatment System by Multi-Soil-Layering Method

1993 ◽  
Vol 27 (1) ◽  
pp. 31-40 ◽  
Author(s):  
T. Wakatsuki ◽  
H. Esumi ◽  
S. Omura
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
High Performance ◽  
Waste Water Treatment ◽  
Treatment System ◽  
Septic Tank ◽  
Horizontal Distance ◽  
Domestic Waste ◽  
Water Treatment System ◽  
Soil Layering

Multi-Soil-Layering (MSL) method was applied to make appropriate, but high performance and N & P-removable, on-site domestic waste water treatment system. The MSL soil unit is composed from soil layer mixed with 10∼25% of metal iron and pelletized jute. The MSL units were piled in a brick pattern at 5cm vertical and 10cm horizontal distance, which were surrounded by layers of Zeolite. Air can be supplied through porous pipes installed at adequate depths of the MSL system. The systems were tested using model houses. The waste waters, which were pretreated by septic tank to the level of SS 29-75, BOD 42-116, COD 32-56, T-N 29-86, and T-P 6-11 mg−l−1 respectively, could be treated at the rate of 100-850 1·m−2·d−1 without significant clogging. The mean concentrations of treated waters were SS 15, BOD 8.7, COD 11, T-N 6.8, and T-P 0.86 mg·1−1 respectively. Zeolite layers and brick pattern prevent clogging. Metal iron and jute pellets were effective to remove Phosphate and Nitrate. Intensive aeration assists decomposition of BOD, COD, and SS as well as nitrification, but decreases denitrif ication and phosphate fixation. The degree of purification could be controlled by setting adequate aeration.

High performance RO membranes for desalination and wastewater reclamation and their operation results

2010 ◽  
Vol 62 (9) ◽  
pp. 2134-2140 ◽  
Author(s):  
M. Henmi ◽  
Y. Fusaoka ◽  
H. Tomioka ◽  
M. Kurihara
Keyword(s):  
Water Treatment ◽  
High Performance ◽  
Semiconductor Industry ◽  
Pure Water ◽  
Waste Water Treatment ◽  
Feed Water ◽  
Water Production ◽  
Wastewater Reclamation ◽  
Seawater Desalination ◽  
Ro Membrane

Reverse osmosis (RO) membrane is one of the most powerful tools for solving the global water crisis, and is used in a variety of water treatment scenes such as drinking water purification, waste-water treatment, boiler feed water production, ultra pure water production for semiconductor industry, etc. The desired performance of RO membrane varies according to quality of feed water being treated, and Toray has been developing RO membranes with suitable characteristic for each operating condition. RO membranes for seawater desalination and wastewater reclamation are especially regarded as most promising targets. Recently, high boron removal and energy saving RO membrane for seawater desalination and low fouling RO membrane for wastewater reclamation have been developed. In this paper, the prospect of attaining these renovative RO membrane, and furthermore, job references will be discussed.

Improvement of Efficiency of Waste Water Treatment from Metals Using Flotation Combines

2020 ◽  
Vol 24 (10) ◽  
pp. 4-7
Author(s):  
B.S. Ksenofontov ◽  
A.S. Kozodayev ◽  
R.A. Taranov ◽  
M.S. Vinogradov
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Water Treatment ◽  
Waste Water Treatment ◽  
Local Treatment ◽  
Experimental Studies ◽  
Treatment Unit ◽  
Reagent Treatment ◽  
Treatment Facilities ◽  
Technical Solutions

The work deals with the use of flotation combines for the treatment of waste water from heavy metals. The analysis of various methods of treatment of waste water from heavy metals was carried out, which revealed the most promising technical solutions with their possible implementation for modernization of existing treatment facilities of the enterprise. Experimental studies of several versions of technological schemes were carried out on the basis of which a technological scheme of waste water treatment was selected, including all positions of equipment existing at local treatment facilities, and supplemented with a reagent treatment unit, treatment in a flotation complex using reagents, application of filters and pH correction.

High Performance RO Membranes for Desalination and Wastewater Reclamation and Their Operation Results

2009 ◽  
Vol 4 (4) ◽  
Author(s):  
M. Henmi ◽  
Y. Fusaoka ◽  
H. Tomioka ◽  
M. Kurihara
Keyword(s):  
Water Treatment ◽  
High Performance ◽  
Semiconductor Industry ◽  
Pure Water ◽  
Waste Water Treatment ◽  
Feed Water ◽  
Water Production ◽  
Wastewater Reclamation ◽  
Seawater Desalination ◽  
Ro Membrane

Reverse osmosis (RO) membrane is one of the most powerful tools for solving the global water crisis, and is used in a variety of water treatment scenes such as drinking water purification, waste-water treatment, boiler feed water production, ultra pure water production for semiconductor industry, etc. The desired performance of RO membrane varies according to quality of feed water being treated, and Toray has been developing RO membranes with suitable characteristic for each operating condition. RO membranes for seawater desalination and wastewater reclamation are especially regarded as most promising targets. Recently, high boron removal and energy saving RO membrane for seawater desalination and low fouling RO membrane for wastewater reclamation have been developed. In this paper, the prospect of attaining these renovative RO membrane, and furthermore, job references will be discussed.

Polar Organic Pollutants on Their Way from Waste Water to Drinking Water

1992 ◽  
Vol 25 (11) ◽  
pp. 241-248 ◽  
Author(s):  
H. Fr. Schröder
Keyword(s):  
Waste Water ◽  
Drinking Water ◽  
Water Treatment ◽  
High Performance ◽  
Waste Water Treatment ◽  
Sewage Treatment ◽  
Drinking Water Treatment ◽  
Mass Spectrometers ◽  
Water Treatment Process ◽  
On Line

The examination of pollutants in waste-, surface- and drinking water by sum parameters like COD, BOD or TOC gives no information about their toxicity or behaviour in the drinking water treatment process. As many pollutants leaving sewage treatment plants are polar and/or thermolabile, gas Chromatographic (GC) separation coupled on-line with a mass spectrometer (MS) is not applicable to this problem. Newly established analytical methods like high performance liquid chromatography (HPLC) in on-line combination with mass- (MS) or tandem mass spectrometers (MS/MS) using soft ionization techniques like thermospray (TSP) would help to solve these problems. The comparison of GC- and LC/MS-spectra demonstrates increasing polarity beginning at the waste water treatment and ending at the drinking water treatment. It was possible to identify and quantify selected compounds, and elimination efficiency could be reviewed by comparing overview spectra. The knowledge about the existence of these compounds in waste-, surface- and drinking water requires strategies for elimination, avoidance or degradation.

Novel RGO–ZnWO4–Fe3O4 nanocomposite as high performance visible light photocatalyst

RSC Advances ◽  
2016 ◽  
Vol 6 (66) ◽  
pp. 61821-61829 ◽  
Author(s):  
M. Mohamed Jaffer Sadiq ◽  
U. Sandhya Shenoy ◽  
D. Krishna Bhat
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Microwave Irradiation ◽  
Visible Light ◽  
High Performance ◽  
Waste Water Treatment ◽  
Microwave Irradiation Method ◽  
Rapid Synthesis ◽  
Visible Light Photocatalyst ◽  
Template Free

Scalable, facile, template-free and rapid synthesis of high performance, eco-friendly photocatalysts using a microwave irradiation method for waste water treatment.

The Advantages of a Compact Filter for Individual or Semi-Collective Waste Water Treatment

1993 ◽  
Vol 27 (1) ◽  
pp. 41-50 ◽  
Author(s):  
A. Fazio ◽  
G. Warot ◽  
P. Vander Borght
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Rural Areas ◽  
High Performance ◽  
Low Cost ◽  
Waste Water Treatment ◽  
Point Of View ◽  
Effluent Treatment ◽  
Septic Tank ◽  
Surface Distribution

In certain rural areas, collective water treatment is not an economically viable solution due to the cost of the water collection facilities (difficult terrain, distance between the houses); for various reasons, however, the traditional individual water treatment system is not highly regarded (bad installation, insufficient maintenance, …) and thus, work has been carried out to develop a high-performance and compact alternative solution for domestic waste water treatment. This alternative system makes use of a compact sand filter installed downstream from the septic tank, the filter's performance is based on supply regulation and improvement of the waste's surface distribution. Hydraulic laboratory studies and follow-up on a testing stand using real effluent have enabled us to develop a standardized compact system which is suitable for use in most terrains. The filter's purification performance is outstanding; at a daily supply rate of 150 l/m2, the average purification yields are over 90 % for COD, BOD, NH4, NKT From the bacteriological point of view, bacterial contamination is also significantly reduced. Laboratory tests are being carried out at present, with the aim of further improving purification by inducing a denitrification process enabling reduction of nitrate levels. This system's compact overall dimensions and relatively low cost mean that it can be used not only for individual waste water treatment but also for effluent treatment for small communities (≤ 400 inhabitant equivalent).

Radioactive Waste Water Treatment by Inorganic Membrane System

2010 ◽  
Author(s):  
Junfeng Li ◽  
Fujuan Han ◽  
Jianlong Wang
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Acrylic Acid ◽  
Waste Water Treatment ◽  
Experimental Studies ◽  
Membrane System ◽  
Inorganic Membrane ◽  
Radioactive Waste Water ◽  
Removal Efficiencies ◽  
Selection For

The removal efficiencies of strontium, cesium and cobalt by inorganic membrane with cut-off 8kD were studied. In order to improve the removal efficiency of non-active nuclides, soluble macropolymers sodium poly(acrylic) acid (NaPAA) of different molecule sizes were selected as chemical assistant reagents to make comparative experimental studies. The molecule of 8000,50000 and 100000 D NaPAA were used. The flux and removal rates of different systems were mainly studied. The results show that for inorganic membrane with pore size of 8kD molecule of 50000 Da NaPAA is the best selection for assistant reagents.

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