Development of anaerobic filters for treatment of high strength agro-industrial wastewaters

1987 ◽  
Vol 2 (1) ◽  
pp. 39-47 ◽  
Author(s):  
P. Weiland
Keyword(s):  
High Strength ◽  
Industrial Wastewaters

scholarly journals Application of Composite Pre-Polymerized Coagulants for the Treatment of High-Strength Industrial Wastewaters

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1258 ◽  
Author(s):  
Athanasia K. Tolkou ◽  
Anastasios I. Zouboulis
Keyword(s):  
High Strength ◽  
Aluminum Concentration ◽  
The Novel ◽  
Industrial Wastewaters ◽  
Residual Aluminum ◽  
Yeast Production ◽  
Wastewater Samples ◽  
Composite Coagulant ◽  
Inorganic Composite

The aim of this study was the investigation of alternative pre-polymerized coagulants for the treatment of high-strength industrial wastewaters, such as those created by tanneries, or by yeast production industries. The novel inorganic composite coagulant examined in this study (as well as variations of it) was denoted as PSiFAC1.5-10-15. The contribution of a typical polyelectrolyte to improve the effectiveness of the coagulation/flocculation (C/F) process was additionally studied, either by adding it separately (i.e., as a flocculant aid) or by co-polymerizing it within the structure of inorganic coagulant (denoted as PAPEFAC1.5-10-15). It was found that the PSiFAC1.5:10:15 coagulant, either with or without the addition of polyelectrolyte, can provide better efficiency for the C/F process than the conventional coagulants. For example, the addition of 80 mg Al/L in yeast production wastewater samples resulted in a 56% reduction of COD, 40% of turbidity, and 43% of phosphates, regarding the pre-treated anaerobically wastewater samples and reduced by an extra 22%, 14%, and 38% for the pre-treated anaerobically plus aerobically wastewater samples, respectively. The residual aluminum concentration in the treated wastewaters was found to be below the legislation limit of 200 μg Al/L. The characterization of coagulants showed the relatively higher Al13 content of 51% and 43% for the cases of PSiFAC1.5-10-15 and PAPEFAC1.5-10-15, respectively, accompanied by the high zeta-potential measurements (50.5 and 39.5 mV).

From the lab to full-scale SBR operation: treating high strength and variable industrial wastewaters

2001 ◽  
Vol 43 (3) ◽  
pp. 347-354 ◽  
Author(s):  
T. G. Flapper ◽  
N. J. Ashbolt ◽  
A. T. Lee ◽  
M. O'Neill
Keyword(s):  
Treatment Plant ◽  
High Strength ◽  
Full Scale ◽  
Design Criteria ◽  
Laboratory Studies ◽  
Effluent Quality ◽  
Industrial Wastewaters ◽  
Treatment Processes ◽  
Complete Treatment ◽  
Commercial Opportunity

This paper describes the path taken from client objectives through laboratory studies and detailed design to full-scale SBR operation and current research. Conventional municipal design principles have often been used to develop treatment processes for industrial wastewaters. The use of scientific trials to test design criteria offers the client a “tailor made” design fit for their particular wastewater character. In this project, a waste management company wished to upgrade their physical-chemical treatment plant to incorporate a biological reactor for treating a range of industrial wastewaters. Laboratory-scale trials were undertaken to determine appropriate design criteria for a full-scale biological process. These laboratory studies indicated that conventional design criteria were not appropriate and that a SBR configuration was optimal compared with an IDAR configuration. It was also found that a novel fungal:bacterial mixed liquor consortium developed, resulting in good effluent quality and settling properties. The treatment plant was able to be constructed and operational within a tight timeframe and budget, allowing the client to take advantage of a commercial opportunity. The plant has been operating since 1997 and meets its discharge conditions. By combining scientific studies with engineering principles, the end-user obtained a complete treatment plant to meet their specific needs. A further benefit of the laboratory trials is current research into the development of a fungal:bacterial SBR to treat industrial wastewaters. This offers ongoing knowledge to the operational full-scale SBR.

Electricity Production and Characterization of High-Strength Industrial Wastewaters in Microbial Fuel Cell

2016 ◽  
Vol 182 (2) ◽  
pp. 468-481 ◽  
Author(s):  
Afsin Y. Cetinkaya ◽  
Oguz Kaan Ozdemir ◽  
Ahmet Demir ◽  
Bestami Ozkaya
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
High Strength ◽  
Electricity Production ◽  
Industrial Wastewaters

Design of Pre-Acidification Reactors for the Anaerobic Treatment of Industrial Wastewaters

1994 ◽  
Vol 29 (9) ◽  
pp. 199-204 ◽  
Author(s):  
I. E. Alexiou ◽  
G. K. Anderson ◽  
L. M. Evison
Keyword(s):  
Industrial Wastewater ◽  
Volatile Fatty Acids ◽  
High Strength ◽  
Pilot Scale ◽  
Anaerobic Treatment ◽  
Coffee Production ◽  
Two Phase ◽  
Industrial Wastewaters ◽  
Wide Range ◽  
Pre Treatment

Two-phase anaerobic digestion has often been considered beneficial for the treatment of high strength industrial wastewaters, especially when the first phase is used as a pre-treatment system known as pre-acidification. Several applications in the field of industrial wastewater treatment have been reviewed in order to evaluate the advantages of the pre-acidification process and its effects on the methanogenic reactor. Although pre-acidification has obvious advantages, complete acidification may be detrimental to the efficiency of the overall process. The use of balancing tanks at full-scale has been common practice for the pre-acidification of a wide range of wastewaters yet no accepted design criteria for acidogenic reactors have been formulated and two-phase applications are generally based upon previous experience. The paper summarizes the results of a two year investigation into pre-acidification at both bench- and pilot-scale, presents the results of instant coffee production wastewaters and discusses a wide range of parameters which have been evaluated. Operating criteria will be discussed and guidelines for the design of pre-acidification reactors will be presented. Finally alternatives to using the total VFA (volatile fatty acids) concentrations for expressing the efficiency of acidogenesis will be introduced.

Anaerobic-Aerobic Treatment of High-Strength Ammonium Wastewater - Nitrogen Removal via Nitrite

1992 ◽  
Vol 26 (5-6) ◽  
pp. 1007-1015 ◽  
Author(s):  
U. Abeling ◽  
C. F. Seyfried
Keyword(s):  
Organic Carbon ◽  
Nitrogen Removal ◽  
High Strength ◽  
Nitrogen Compounds ◽  
Aerobic Treatment ◽  
Carbon Consumption ◽  
Industrial Wastewaters ◽  
New Process ◽  
Essential Parameter ◽  
Pre Treatment

The two-stage anaerobic-aerobic treatment is applied by preference for the purification of high-concentrated industrial wastewaters. With regard to the elimination of nitrogen compounds by denitrification the far-reaching reduction of organic carbon during the anaerobic pre-treatment is problematic. A new process of nitrification/denitrification via nitrite wais found to be available in half-technical experiences with high operation security. The carbon consumption amounts only to 60 % in comparison with denitrification via nitrate. The essential parameter for regulating the process is the concentration of free ammonia in the reactor. Concentrations of 1 to 5 mg NH3/l inhibit the nitratation but not the nitritation. The content of ammonia was controlled by means of continuous NH4− and pH-measuring. The inhibition limit for denitrification was found to be at 0.13 mg HN02/l.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

Effects of cooling rate on the mechanical properties of dual phase treated vanadium steels

1983 ◽  
Vol 41 ◽  
pp. 220-221
Author(s):  
L.J. Chen ◽  
H.C. Cheng ◽  
J.R. Gong ◽  
J.G. Yang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Automobile Industry ◽  
High Strength ◽  
Weight Percent ◽  
Low Alloy Steels ◽  
Dual Phase ◽  
Resource Requirement ◽  
Alloy Steels ◽  
Potential Weight

For fuel savings as well as energy and resource requirement, high strength low alloy steels (HSLA) are of particular interest to automobile industry because of the potential weight reduction which can be achieved by using thinner section of these steels to carry the same load and thus to improve the fuel mileage. Dual phase treatment has been utilized to obtain superior strength and ductility combinations compared to the HSLA of identical composition. Recently, cooling rate following heat treatment was found to be important to the tensile properties of the dual phase steels. In this paper, we report the results of the investigation of cooling rate on the microstructures and mechanical properties of several vanadium HSLA steels.The steels with composition (in weight percent) listed below were supplied by China Steel Corporation: 1. low V steel (0.11C, 0.65Si, 1.63Mn, 0.015P, 0.008S, 0.084Aℓ, 0.004V), 2. 0.059V steel (0.13C, 0.62S1, 1.59Mn, 0.012P, 0.008S, 0.065Aℓ, 0.059V), 3. 0.10V steel (0.11C, 0.58Si, 1.58Mn, 0.017P, 0.008S, 0.068Aℓ, 0.10V).

Sign in / Sign up

Export Citation Format

Share Document