Improvement of gas permeability of denitrifying PVA gel beads

1996 ◽  
Vol 18 (7) ◽  
pp. 502-506 ◽  
Author(s):  
Kuo-Cheng Chen ◽  
Shu-Juan Chen ◽  
Jer-Yiing Houng
Keyword(s):  
Gas Permeability ◽  
Gel Beads ◽  
Pva Gel

scholarly journals Treatment Capability and Microbial Community of Anammox Process Using PVA Gel Beads as Biomass Carriers

2011 ◽  
Vol 47 (4) ◽  
pp. 137-145
Author(s):  
ZHIGANG LI ◽  
DAISUKE HIRA ◽  
TAKAO FUJII ◽  
KENJI FURUKAWA
Keyword(s):  
Microbial Community ◽  
Gel Beads ◽  
Pva Gel ◽  
Anammox Process

Bench-scale study using PVA gel as a biocarrier in a UASB reactor treating corn steep liquor wastewater

2007 ◽  
Vol 56 (7) ◽  
pp. 65-71 ◽  
Author(s):  
W. Zhang ◽  
K. Furukawa ◽  
J.D. Rouse
Keyword(s):  
Volatile Fatty Acids ◽  
Corn Steep Liquor ◽  
Gas Production ◽  
Continuous Treatment ◽  
Uasb Reactor ◽  
Natural Occurrence ◽  
Granule Formation ◽  
Gel Beads ◽  
Pva Gel ◽  
Steep Liquor

PVA-gel beads were used as a biocarrier for treatment of corn steep liquor wastewater containing high levels of volatile fatty acids (VFA), where retention of biomass could be either solely in the porous microstructure of the gel or by granule formation using a gel bead as a nucleus. With stable COD removal efficiencies of 90% or greater, continuous treatment was demonstrated over a four month period, with organic loading rates being increased stepwise from 2.5 to 22.5 kg COD/m3 d. In addition, VFA in the effluent were, with few exceptions maintained close to zero. Gas production increased over the course of the study and reached a level of 0.38 m3/kg COD consisting of 65% methane with the remainder being mostly carbon dioxide. Biomass granules containing methane producing bacteria progressively formed around the PVA-gel beads during the study. In contrast, very few small natural granules developed apart from PVA-gel nuclei indicating that PVA gel may serve well as a seeding material to enhance granulation when natural occurrence is lacking.

scholarly journals High-strength ethylene glycol wastewater treatment in anaerobic polyvinyl alcohol gel beads based biofilm reactor

2015 ◽  
Vol 18 (1) ◽  
pp. 47-55
Keyword(s):  
Ethylene Glycol ◽  
Polyvinyl Alcohol ◽  
Settling Velocity ◽  
Loading Rate ◽  
High Strength ◽  
Biofilm Reactor ◽  
Cod Removal ◽  
Organic Loading Rate ◽  
Gel Beads ◽  
Pva Gel

<div> <p>In this paper, ethylene glycol wastewater (EGW) treatment was studied by using one anaerobic polyvinyl alcohol (PVA) gel beads based biofilm reactor. Enhanced by PVA-gel beads based biofilm, organic loading rate (OLR) about 11 g COD l<sup>-1</sup> d<sup>-1</sup> was achieved at the end of this study. Black PVA-gel beads with an average settling velocity 322 m h<sup>-1</sup> (9 cm s<sup>-1</sup>) and 0.24g VSS g<sup>-1</sup> PVA gel mainly composed of <em>Methanosarcina spp</em>. were got, while no natural granules were found in this experiment. The COD removal efficiency in this study could reach a high value about 95%. Most COD removal was contributed by the PVA-gel beads based biofilm. It could be concluded that the PVA-gel beads based biofilm reactor is appropriate for EGW treatment.</p> </div> <p>&nbsp;</p>

scholarly journals STUDY ON POLYVINYL ALCOHOL GEL BEADS AS BIOCARRIER APPLIED IN ANAEROBIC SLUDGE IMMOBILIZATION IN THE UASB REACTOR

2018 ◽  
Vol 54 (4A) ◽  
pp. 197
Author(s):  
To Tien Tai
Keyword(s):  
Polyvinyl Alcohol ◽  
Promising Result ◽  
Sulfate Solution ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
High Mechanical Strength ◽  
Gel Beads ◽  
Rubber Wastewater ◽  
Pva Gel ◽  
Uasb Reactors

In this study, the biocarrier was made of 8 % (w/v) polyvinyl alcohol (PVA) solution dropped into saturated solution of boric acid (6 %, w/v), then immersed for 2 hours to form PVA-boric bead. In order to maintain the crosslinked beads, it is subsequently immersed in 1M sodium sulfate solution for 1 hour. PVA gel beads have the diameter of 3.5 - 5.0 mm, a specific gravity of 1.03 - 1.08 g/cm3, high mechanical strength and good elasticity. The surface and internal structure particle were observed under a scanning electron microscope (SEM). The application of PVA beads in microbial immobilization was initially examined in three UASB reactors treating rubber wastewater with sludge and PVA beads ratios of 1/1, 2/1, 3/1 (v/v), respectively. Promising result of bio-immobilization was achieved, at ratio of 1/1, the SMA of PVA beads was 0.133 g COD/gVSS/day, corresponding to 17 % of the suspended sludge’s value in the same reactor and the attached biomass was 0.936 g VSS/g dried PVA bead after 90 days.

scholarly journals Preparation and bacteriostatic research of porous polyvinyl alcohol / biochar / nanosilver polymer gel for drinking water treatment

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hang Zhao ◽  
Xuexiang Li ◽  
Liang Zhang ◽  
Zhihui Hu ◽  
Lvling Zhong ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Polyvinyl Alcohol ◽  
Drinking Water Treatment ◽  
Polymer Gel ◽  
Practical Application ◽  
Gel Beads ◽  
Ft Ir ◽  
Porous Silver ◽  
Pva Gel

AbstractMicrobial contamination in drinking water has become an important threat to human health. There is thus an urgent need to develop antibacterial materials to treat drinking water. Here, porous silver-loaded biochar (C–Ag) was prepared using corn straw as the substrate and silver as the antibacterial agent. C–Ag was then uniformly distributed in polyvinyl alcohol gel beads of eluted calcium carbonate to prepare p-PVA/C–Ag antibacterial composite. The polymer composites were tested by FT-IR, XRD, SEM and TG-DSC. The results showed that C–Ag was more evenly distributed in the PVA gel spheres. Antibacterial experiments showed that p-PVA/C–Ag greatly inhibited Escherichia coli. Practical application tests revealed that p-PVA/C–Ag showed high and sustained bactericidal inhibition and reusability. Generally, p-PVA/C–Ag composite shows high potential to be applied to drinking water treatment.

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