Effect of Substrate Concentration Variation on Scleroglucan Production using Aerobic Fermentation

SummaryThe activity of several synthetic compounds, rated from good to poor (or inactive) fibrinolytic activators, has been assessed by two different commonly-used in vitro methods. Compounds shown to be active over a narrow concentration range in the hanging clot test were shown to be inhibitors of plasmin and trypsin in the casein-olytic test. The inhibitory activity of these compounds was shown to increase with increasing substrate concentration and apparent activity in the hanging clot test. Possible explanations and relevance of these observations are discussed.

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FUNGAL BIOSOLUBILIZATION OF POLISH LIGNITE: THE EFFECT OF SUBSTRATE CONCENTRATION

Electronic Journal of Polish Agricultural Universities ◽

10.30825/5.ejpau.15.2018.21.1 ◽

2018 ◽

Vol 21 (1) ◽

Author(s):

Hanna Miszkiewicz ◽

◽

Olga Marchut-Mikołajczyk ◽

Lidia Mielcarz ◽

Stanisław Bielecki ◽

...

Keyword(s):

Substrate Concentration

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Multiplication of a Klebsiella pneumoniae Strain in Water at Low Concentrations of Substrates

Water Science & Technology ◽

10.2166/wst.1988.0274 ◽

1988 ◽

Vol 20 (11-12) ◽

pp. 117-123 ◽

Cited By ~ 8

Author(s):

D. van der Kooij ◽

W. A. M. Hijnen

Keyword(s):

Amino Acids ◽

Water Treatment ◽

Klebsiella Pneumoniae ◽

Substrate Concentration ◽

Treatment System ◽

Water Treatment System ◽

Low Concentrations ◽

Ks Values ◽

Substrate Concentrations

A K.pneumoniae strain, isolated from a water treatment system, was tested in growth measurements for its ability to multiply at substrate concentrations of a few micrograms per liter. The organism multiplied on mixtures of carbohydrates and amino acids at a substrate concentration of 1 µg of C of each compound per liter. Tests with individual compounds revealed that especially carbohydrates were utilized at low concentrations. The Ks values obtained for maltose and maltopentaose were 53 µg of C/l and 114 µg of C per liter, respectively. The significance of the growth of K.pneumoniae at low substrate concentrations is discussed.

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Respirometry for determination of the influents SS-concentration

Water Science & Technology ◽

10.2166/wst.1996.0031 ◽

1996 ◽

Vol 33 (1) ◽

pp. 311-323 ◽

Cited By ~ 2

Author(s):

A. Witteborg ◽

A. van der Last ◽

R. Hamming ◽

I. Hemmers

Keyword(s):

Experimental Design ◽

Activated Sludge ◽

Substrate Concentration ◽

Full Scale ◽

Activated Sludge Process ◽

Respiration Rates ◽

On Line ◽

Large Measurement ◽

Set Up

A method is presented for determining influent readily biodegradable substrate concentration (SS). The method is based on three different respiration rates, which can be measured with a continuous respiration meter which is operated in a cyclic way. Within the respiration meter nitrification is inhibited through the addition of ATU. Simulations were used to develop the respirometry set-up and decide upon the experimental design. The method was tested as part of a large measurement programme executed at a full-scale plant. The proposed respirometry set-up has been shown to be suitable for a semi-on-line determination of an influent SS which is fully based on the IAWQ #1 vision of the activated sludge process. The YH and the KS play a major role in the principle, and should be measured directly from the process.

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The role of (bio)surfactant sorption in promoting the bioavailability of nutrients localized at the solid-water interface

Water Science & Technology ◽

10.2166/wst.1999.0336 ◽

1999 ◽

Vol 39 (7) ◽

pp. 91-98 ◽

Cited By ~ 3

Author(s):

Ryan N. Jordan ◽

Eric P. Nichols ◽

Alfred B. Cunningham

Keyword(s):

Mass Transfer ◽

Cell Membrane ◽

Substrate Concentration ◽

Water Interface ◽

Industrial Systems ◽

Solid Liquid Interface ◽

Solid Liquid ◽

Surfactant Sorption

Bioavailability is herein defined as the accessibility of a substrate by a microorganism. Further, bioavailability is governed by (1) the substrate concentration that the cell membrane “sees,” (i.e., the “directly bioavailable” pool) as well as (2) the rate of mass transfer from potentially bioavailable (e.g., nonaqueous) phases to the directly bioavailable (e.g., aqueous) phase. Mechanisms by which sorbed (bio)surfactants influence these two processes are discussed. We propose the hypothesis that the sorption of (bio)surfactants at the solid-liquid interface is partially responsible for the increased bioavailability of surface-bound nutrients, and offer this as a basis for suggesting the development of engineered in-situ bioremediation technologies that take advantage of low (bio)surfactant concentrations. In addition, other industrial systems where bioavailability phenomena should be considered are addressed.

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Model-based control of the substrate concentration in an aeration basin using the wastewater level

Water Science & Technology ◽

10.2166/wst.1998.0559 ◽

1998 ◽

Vol 37 (12) ◽

pp. 335-342 ◽

Cited By ~ 2

Author(s):

Jacek Czeczot

Keyword(s):

Substrate Concentration ◽

Consumption Rate ◽

Least Square Method ◽

Estimation Procedure ◽

Adaptive Controller ◽

Open Loop ◽

Least Square ◽

Substrate Consumption ◽

Model Based ◽

Effluent Flow Rate

This paper deals with the minimal-cost control of the modified activated sludge process with varying level of wastewater in the aerator tank. The model-based adaptive controller of the effluent substrate concentration, basing on the substrate consumption rate and manipulating the effluent flow rate outcoming from the aerator tank, is proposed and its performance is compared with conventional PI controller and open loop behavior. Since the substrate consumption rate is not measurable on-line, the estimation procedure on the basis of the least-square method is suggested. Finally, it is proved that cooperation of the DO concentration controller with the adaptive controller of the effluent substrate concentration allows the process to be operated at minimum costs (low consumption of aeration energy).

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Processing of granite quarry solid waste into industrial high silica materials using leaching process with HCl concentration variation

Jurnal Riset Teknologi Pencegahan Pencemaran Industri ◽

10.21771/jrtppi.2020.v11.no2.p43-50 ◽

2020 ◽

Vol 11 (2) ◽

pp. 43-50

Author(s):

Yusup Hendronursito ◽

Muhammad Amin ◽

Slamet Sumardi ◽

Roniyus Marjunus ◽

Frista Clarasati ◽

...

Keyword(s):

Particle Size ◽

Rotational Speed ◽

Inductively Coupled Plasma ◽

Chemical Elements ◽

Silica Content ◽

X Ray ◽

Concentration Variation ◽

Leaching Process ◽

Hcl Concentration ◽

Granite Powder

This study was aimed to increase granite's silica content using the leaching process with HCl concentration variation. The granite used in this study came from Lematang, South Lampung. This study aims to determine the effect of variations in HCl concentration, particle size, and rotational speed on the crystalline phase and chemical elements formed in the silica product produced from granite. The HCl concentration variations were 6.0 M, 7.2 M, 8.4 M, and 9.6 M, the variation in particle size used was 270 and 400 mesh. Variations in rotational speed during leaching were 500 and 750 rpm. Granite powder was calcined at 1000 ºC for 2 hours. Characterization was performed using X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), and Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP- OES). The results showed that the silica content increased with increasing HCl concentration, the finer the particle size, and the higher the rotational speed. XRF analysis showed that the silica with the highest purity was leached with 9.6 HCl with a particle size of 400 mesh and a rotational speed of of 750 rpm, which was 73.49%. Based on the results above, by leaching using HCl, the Si content can increase from before. The XRD diffractogram showed that the granite powder formed the Quartz phase.

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