Color and suspended solid removal with a novel coagulation technology

2002 ◽  
Vol 2 (5-6) ◽  
pp. 77-81
Author(s):  
D. Pak ◽  
W. Chang
Keyword(s):  
Molten Slag ◽  
Settling Velocity ◽  
Removal Rate ◽  
Gel Permeation Chromatography ◽  
Textile Wastewater ◽  
Suspended Solid ◽  
Low Molecular Weight ◽  
Steel Making ◽  
Gel Permeation ◽  
Settling Characteristic

A novel coagulation technology using atomized molten slag with ferrous sulfate has been developed to treat a turbid and colored water or wastewater. The atomized molten slag is produced by atomizing the molten slag from the steel-making process. The atomized molten slag has magnetic iron oxide in its constituent molecules so that it is magnetized. In this novel coagulation technology, the atomized molten slag acts as nuclei for coagulation process and weighting agent for the resultant floc. In this study, this new coagulation technology was compared with metal hydroxide flocs such as FeCl3 and PAC in treating textile wastewater. A batch settling test was conducted to investigate the settling characteristic of sludge formed with the atomized molten slag. The settling velocity of sludge formed with the atomized molten slag is almost ten times greater than that of sludge formed with FeCl3 or PAC. The coagulation using the atomized molten slag showed a higher removal rate of color, suspended solid, TOC, COD, TKN and T-P. The atomized molten slag is capable of adsorbing organic substance, ammonia and phosphate. This characteristic leads to higher removal rate than FeCl3 or PAC. The gel permeation chromatography of the wastewater treated using the atomized molten slag illustrated that this novel coagulation technology is more efficient in removing the particles with low molecular weight. The removal rates of color, suspended solid, COD, TOC, ammonia and phosphorous increase with increasing amount of atomized molten slag addition. Even though the atomized molten slag was overdosed, restabilization of particles was not encountered.

scholarly journals Fractionation of lignosulphonates released during the early stages of delignification

1983 ◽  
Vol 61 (2) ◽  
pp. 416-420 ◽  
Author(s):  
Norman G. Lewis ◽  
David A. I. Goring ◽  
Alfred Wong
Keyword(s):  
Molecular Weight ◽  
High Performance ◽  
Black Spruce ◽  
Gel Permeation Chromatography ◽  
Bimodal Distribution ◽  
High Yield ◽  
Low Molecular Weight ◽  
Lower Yield ◽  
Spruce Wood ◽  
Gel Permeation

High-yield spent bisulphite liquor (HY-SBL) from sulphonated black spruce wood (Piceamariana) was fractionated by gel permeation chromatography (GPC) and by high-performance liquid chromatography (HPLC). The GPC fractionation gave a wide bimodal distribution, whereas with HPLC, a more detailed resolution was seen with the bulk of the fraction giving several clearly defined peaks. The paucidisperse material was further concentrated by a bulk fractionation of the crude SBL which included complexing the lignosulphonates with dicyclohexylamine. The isolated paucidisperse material was found to be dialyzable and to constitute 90% of the lignosulphonate in the sample of SBL. If the bisulphite pulp obtained was recooked in fresh acid sulphite liquor to a lower yield, most of the lignosulphonate dissolved was widely polydisperse with no indication of the discrete components resolvable by HPLC. However, 25% of the lignin made soluble was in the form of the paucidisperse fractions. In all, we were able to obtain about 50% of the lignin in spruce wood as a relatively low molecular weight lignosulphonate resolvable into discrete fractions by HPLC.

Comparison of Number—Average Molecular Weights Calculated by GPC and Membrane Osmometry

1973 ◽  
Vol 46 (1) ◽  
pp. 115-126
Author(s):  
M. R. Ambler ◽  
R. D. Mate
Keyword(s):  
Molecular Weight ◽  
Gel Permeation Chromatography ◽  
Appreciable Amount ◽  
Diffusion Limit ◽  
Low Molecular Weight ◽  
Molecular Weights ◽  
True Value ◽  
Usual Manner ◽  
Gel Permeation ◽  
Polymer Species

Abstract Data are presented which show that when a polymer contains an appreciable amount of low molecular weight species below the diffusion limit of the osmometer membrane, the osmotic molecular weight, Mn, is generally higher than the Mn calculated from gel-permeation chromatography (GPC). Experiments were performed on samples of poly(vinylchloride) (PVC) and high-cis poly (butadiene) polymers. Osmotic data were obtained in the usual manner, while GPC data were obtained using the universal calibration approach. It was found that when all polymer species below approximately 10,000 molecular weight were excluded from the calculation of Mn by GPC, agreement in Mn was obtained between membrane osmometry and GPC. The data obtained suggest that the choice of Mn as measured by membrane osmometry in the calibration of the GPC should not be done casually, as the measured Mn may not reflect the “true” value of that sample, especially when the polymer sample contains an appreciable amount of low molecular weight material.

Removal of Organics from Leachate by the Combined Process of a Facultative Pre-Treatment Pond and an Aerated Lagoon at a Sea-Based Solid Waste Disposal Site

1987 ◽  
Vol 19 (12) ◽  
pp. 101-107 ◽  
Author(s):  
K. Takamizawa ◽  
O. Yamamoto ◽  
I. Fukunage ◽  
Z. Inoue ◽  
A. Honda
Keyword(s):  
Retention Time ◽  
Rate Coefficient ◽  
Removal Rate ◽  
Gel Permeation Chromatography ◽  
Disposal Site ◽  
Solid Waste Disposal ◽  
Waste Disposal Site ◽  
Combined Process ◽  
Gel Permeation ◽  
Pre Treatment

Leachate was collected from the sea-based North Port Solid Waste Disposal Site, Osaka City, and a bench-scale treatment of the combined process of a facultative pre-treatment pond and an aerated lagoon was applied for more than 120 days. The maximum BOD removal rate coefficient and COD-manganese removal rate coefficient were 0.090/day and 0.018/day, respectively. These values were obtained when the retention time of the facultative pre-treatment pond was 25 days. But, if the retention time was beyond or below 25 days, both removal rate coefficients were smaller. Therefore, we concluded that the optimum retention time of a facultative pre-treatment pond was 25 days. This was reconfirmed by the Gel-Permeation Chromatography of the treated leachate, a method for evaluating wastewater treatability proposed by Tambo and Kamei (Water Research, 12, 931-950, 1978). Furthermore, the Gel-Permeation Chromatography pattern of the treated leachate in the bench-scale experiment coincided with that obtained by the actual field test. In addition, judging from Tambo's evaluation method, it could be concluded that higher-molecular organics were decomposed biologically into lower-molecular organics at the middle and bottom layer of the facultative pre-treatment pond. BOD and COD-manganese values of below 10 mg/l and about 130 mg/l, respectively appear to be the maximum effective level of the combined process.

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