Biofiltration of Ozonated Humic Water in Expanded Clay Aggregate Filters

1999 ◽  
Vol 40 (9) ◽  
pp. 165-172 ◽  
Author(s):  
E. S. Melin ◽  
H. Ødegaard
Keyword(s):  
Organic Matter ◽  
Steady State ◽  
Loading Rate ◽  
Glyoxylic Acid ◽  
Treatment Plant ◽  
Good Alternative ◽  
Pilot Scale ◽  
Raw Water ◽  
Methyl Glyoxal ◽  
By Products

Treatment of humic water was studied in a pilot-scale ozonation/biofiltration treatment plant. The raw water had TOC and CODMn concentrations of 3.2-5.0 and 4.1-6.6 mgO 1−1, respectively, and colour (410 nm) of 30-50 mgPt 1−1. The effect of biofilter loading rate on removal of organic matter and ozonation by-products was investigated in two upflow biofilters containing expanded clay aggregate (Filtralite) media. The empty bed contact times ranged from 11 to 54 min. The TOC removals varied from 18 to 37% and the CODMn removals from 30 to 48% with ozone dosages from 1.0 to 1.7 mgO3 mgTOC−1. The ozone dosage seemed to have larger effect on removal efficiency than the loading rate. Concentrations of aldehydes (sum of formaldehyde, acetaldehyde, glyoxal and methyl glyoxal) were 41-47 μg 1−1 in ozonated water. Formaldehyde and glyoxal were the only aldehydes detected from the biofilter effluents at concentrations higher than 1 μg 1−1, but their mean concentrations were below 2.1 μg 1−1. The ketoacid concentrations (sum of glyoxylic, pyruvic and ketomalonic acids) ranged from 272 to 441 μg 1−1. Average biofilter effluent concentrations varied from 5.3 (glyoxylic acid) up to 67 μg 1−1 (ketomalonic acid) with steady-state reductions generally over 80%. The aldehydes and ketoacids accounted on average for 16% of the biodegraded TOC. The results show that expanded clay aggregate media is a good alternative as biofilter material.

The effect of preozonation on microorganism and particle removal

2000 ◽  
Vol 41 (7) ◽  
pp. 9-16 ◽  
Author(s):  
J. Y. Gaubert ◽  
C. Piet ◽  
D. Gatel ◽  
P. Bonne ◽  
J. Hutchison ◽  
...  
Keyword(s):  
Treatment Plant ◽  
Water Treatment Plant ◽  
Pilot Scale ◽  
Virus Inactivation ◽  
Particle Removal ◽  
Raw Water ◽  
European Regulation ◽  
Study Results ◽  
Microorganism Removal ◽  
By Products

The new European regulation on treated water focuses on oxidation by-products and consequently the use of ozone for parasites and virus inactivation should be limited. To achieve the necessary removal of parasites by a multi-barrier water treatment plant, physical removal needs to achieve consistently high levels of particle and microorganism removal. TheNeuilly-sur-Marne treatment plant treats raw water of particularly poor bacteriological quality. In order to improve the filtered water quality, preozonationhas been tested in a pilot scale study. Results obtained have confirmed that, with this sort of raw water, preozonation directly on the raw water or on the settled water can provide a significant improvement in filtered water. This is true for both particles and coliforms. It appears that an ozone dose of 0.5 g/m3 is enough to achieve a constant level of efficiency.

The effect of the molecular mass of the organic matter in raw water on the formation of disinfection by-products

2001 ◽  
Vol 50 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Chen-Yu Chang ◽  
Yung-Hsu Hsieh ◽  
Yu-Min Lin ◽  
Po-Yu Hu ◽  
Chin-Chuan Liu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Molecular Mass ◽  
Raw Water ◽  
By Products

Analysis on the Natural Organic Matter and Disinfection By-Products in Full-scale Advanced Water Treatment Plant and Conventional Water Treatment Plant

2013 ◽  
Vol 51 (31-33) ◽  
pp. 6288-6298 ◽  
Author(s):  
Jei-cheol Jeon ◽  
Chang-Hyun Jo ◽  
Ilhwan Choi ◽  
Soon-Buhm Kwon[a] Ennkyung Jang ◽  
Tae-Mun Hwang
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Full Scale ◽  
By Products

Long-term studies on hybrid ceramic microfiltration for treatment of surface water containing high dissolved organic matter

2013 ◽  
Vol 14 (2) ◽  
pp. 246-254 ◽  
Author(s):  
A. Abeynayaka ◽  
C. Visvanathan ◽  
S. Khandarith ◽  
T. Hashimoto ◽  
H. Katayama ◽  
...  
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Pilot Scale ◽  
Transmembrane Pressure ◽  
Raw Water ◽  
Operational Parameters ◽  
Polyaluminum Chloride ◽  
Filtration Cycle

This long-term pilot-scale study on the performance of ceramic microfiltration (CMF) was conducted at the Bangkhen water treatment plant (BWTP), with the raw water from Chaophraya River, Thailand. Raw water turbidity and dissolved organic carbon (DOC) were varied in the ranges of 20–210 NTU and 3.0–8.5 mg/L respectively. The hybrid pilot-scale CMF (Pilot-CMF) operational parameters were optimized with the aid of jar-tests and laboratory-scale CMF (Lab-CMF) operations. The systems were operated with various polyaluminum chloride dosages and filtration cycle times. Pilot-CMF provided excellent steady turbidity removal compared to the conventional water treatment process. DOC removal percentages of Pilot-CMF and the conventional process at the BWTP were 49% and 30% respectively. With different coagulant dosages, unique patterns in transmembrane pressure (TMP) variations were observed. The daily TMP increment under low turbidity conditions was 0.08 kPa/day. During rainy periods (turbidity over 100 NTU) the TMP increment reached 0.79 kPa/day. However, once the turbidity of raw water reaches normal conditions (30–60 NTU at the BWTP) the Pilot-CMF system recovers the TMP increment due to efficient backwashing.

scholarly journals The formation of aldehydes and ketones ozonation by-products and their variation through general water treatment plant in Hamadan, Iran

2015 ◽  
Vol 17 (4) ◽  
pp. 682-691 ◽  
Keyword(s):  
Water Treatment ◽  
Pyruvic Acid ◽  
Water Samples ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Methyl Glyoxal ◽  
Aldehydes And Ketones ◽  
Glyoxalic Acid ◽  
Treatment Train ◽  
By Products

<div> <p>The effect of pre-ozonation on the formation of four aldehydes (i.e. formaldehyde, acetaldehyde, glyoxal, methyl glyoxal) and two ketones (i.e. pyruvic acid and glioxalic acid) at the Beheshti water treatment plant in Hamadan, Iran were studied. Water samples were taken from the treatment plant at different points of the treatment train during September-January, 2013. The variation of formaldehyde, acetaldehyde, glyoxal, methyl glyoxal, pyruvic acid, and acid glioxalic concentration within treatment process were monitored in September and January. The results indicated that formaldehyde and acetaldehyde were the most abundant aldehyde species in the raw water. After pre-ozonation all of the aldehydes and ketones reached the maximum concentration. On the contrary, results show that the coagulation-filtration process was beneficial to the removal of aldehydes and ketones. Also, the results indicated that the level of aldehydes was increased after post chlorination. The percent increase was 52.3, 34.6, 12.1, 26.8 and 38% for formaldehyde, acetaldehyde, glyoxal, methyl glyoxal and glyoxalic acid, respectively, in September. Therefore, final chlorination led to increase in the formation of aldehydes in the pre-ozonated water. Ketones were not detected in the post-chlorinated water. Moreover, there was no correlation between total organic carbon (TOC) and total aldehyde and total ketone in water samples.&nbsp;</p> </div> <p>&nbsp;</p>

scholarly journals Characterization of dissolved organic matter at a water treatment plant with closed systems in different seasons

2020 ◽  
Vol 20 (5) ◽  
pp. 2013-2020
Author(s):  
Hudori Hudori ◽  
Toshiro Yamada ◽  
Yukitaka Suzuki ◽  
Maulana Yusup Rosadi ◽  
Hiroto Tamaoki ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Water Treatment ◽  
Dissolved Organic Matter ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Raw Water ◽  
Recycled Water ◽  
Water Treatment Process ◽  
Closed Systems

Abstract This research focuses on characterizing the dissolved organic matter found at water treatment plants with closed systems. Recycled water generated as a by-product of water treatment is added to raw water in those systems. The dissolved organic matter in the raw water was found to be higher in summer than in winter, but the water treatment process was able to produce purified water of the similar quality in both seasons. The recycled water contained mostly low molecular weight and protein-like substances, and this composition was different from that of the raw water, which mainly contained humic-like substances. The recycled water did not influence the concentration of humic-like substances or the molecular weight distribution in the influent water.

Speciation and seasonal variation of various disinfection by-products in a full-scale drinking water treatment plant in East China

2019 ◽  
Vol 19 (6) ◽  
pp. 1579-1586 ◽  
Author(s):  
Xiang-Ren Zhou ◽  
Yi-Li Lin ◽  
Tian-Yang Zhang ◽  
Bin Xu ◽  
Wen-Hai Chu ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Full Scale ◽  
East China ◽  
Raw Water ◽  
Drinking Water Treatment Plant ◽  
By Products

Abstract The objective of this research was to study the occurrence and seasonal variations of disinfection by-products (DBPs), including traditional carbonaceous and emerging nitrogenous DBPs, in a full-scale drinking water treatment plant (DWTP) for nearly 2 years. The removal efficiencies of each DBP through the treatment processes were also investigated. This DWTP takes raw water from the Yangtze River in East China. The quality of the raw water used in this DWTP varied with different seasons. The results suggested that DBP concentrations of the finished water were higher in spring (82.33 ± 15.12 μg/L) and summer (117.29 ± 9.94 μg/L) with higher dissolved organic carbon (DOC) levels, but lower in autumn (41.10 ± 5.82 μg/L) and winter (78.47 ± 2.74 μg/L) with lower DOC levels. Due to the increase of bromide concentration in spring and winter, more toxic brominated DBPs increased obviously and took up a greater proportion. In this DWTP, DBP concentrations increased dramatically after pre-chlorination, especially in summer. It is noteworthy that the removal of DBPs during the subsequent treatment was more obvious in spring than in the other three seasons because the pH value is more beneficial to coagulation in spring.

MICROCLEAR: GREEN TECHNOLOGY FOR TREATING AND RECYCLING OF COLOURED WASTEWATER

2015 ◽  
Vol 77 (31) ◽  
Author(s):  
Zaharah Ibrahim ◽  
Adibah Yahya ◽  
Azmi Aris ◽  
Ifnu Hakim ◽  
Mohd Ariff Taib ◽  
...  
Keyword(s):  
Textile Industry ◽  
Large Scale ◽  
Treatment Plant ◽  
Textile Wastewater ◽  
Good Alternative ◽  
Pilot Scale ◽  
Green Technology ◽  
Scale Production ◽  
Continuous Growth ◽  
Set Up

The continuous growth and demand for our textiles and textile products have resulted in the generation of highly polluted and coloured wastewater emanating from the textile industries. These are detrimental to the environment and pose health threats to the human population if not properly treated. The treatment of colour is a great challenge over the last decades and until now, there is no single and economical treatment process.  As effective treatment plant is generally expensive and unaffordable; a good alternative and timely solution is the utilisation of specialised group of microbes called Microclear. These microorganisms have the abilities to decolourise and transform coloured compounds into simpler and non-hazardous compounds without the use of chemicals. Intensive fundamental studies and also the application of the Microclear at the bench and pilot scale (sequential 1000 L and 2000 L) reactors to treat real wastewater were carried out. The microbes can also be applied directly into the existing treatment plant or ponding systems without the use of a commercial reactor. . Under the UTM-MTDC symbiosis program, Microclear Sdn. Bhd. was set up and work is in progress for large scale production of microbes to treat real textile wastewater in a demo plant of 150,000 L capacity located at the textile industry.

Sign in / Sign up

Export Citation Format

Share Document