scholarly journals Comparing Ozonation and Biofiltration Treatment of Source Water with High Cyanobacteria-Derived Organic Matter: The Case of a Water Treatment Plant Followed by a Small-Scale Water Distribution System

2018 ◽  
Vol 15 (12) ◽  
pp. 2633 ◽  
Author(s):  
I-Chieh Chien ◽  
Sheng-Pei Wu ◽  
Hsien-Chun Ke ◽  
Shang-Lien Lo ◽  
Hsin-hsin Tung
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Cyanobacterial Blooms ◽  
Small Scale ◽  
Source Water

High cyanobacteria-derived dissolved organic carbon (DOC) in source water can cause drinking water quality to deteriorate, producing bad taste, odor, toxins, and possibly elevated levels of disinfection byproduct (DBP) precursors. Conventional water treatment processes do not effectively remove algal organic substances. In this study, rapid-sand-filtration effluent from a water treatment plant on Kinmen Island, where serious cyanobacterial blooms occurred, was used to evaluate the DOC- and DBP-removal efficiency of ozonation and/or biofiltration. To simulate a small-scale water distribution system following water treatment, 24 h simulated distribution system (SDS) tests were conducted. The following DBPs were analyzed: trihalomethanes (THMs), haloacetic acids (HAAs), haloacetonitriles (HANs), and trichloronitromethane (TCNM). Applying biological activated-carbon filtration (BAC) on its own achieved the greatest reduction in SDS-DBPs. Ozonation alone caused adverse effects by promoting THM, HAA, and TCNM formation. Ozonation and BAC filtration yielded better DOC removal (51%) than BAC filtration alone (41%). Considering the cost of ozonation, we suggest that when treating high cyanobacterial organic matter in water destined for a small-scale water distribution system, BAC biofiltration alone could be an efficient, economical option for reducing DBP precursors. If DOC removal needs to be improved, preceding ozonation could be incorporated.

Natural Organic Matter and Disinfectant By-Products (DBPs) Formation Potential in Agriculture Area in Malaysia

2015 ◽  
Vol 802 ◽  
pp. 513-518
Author(s):  
Nurazim Ibrahim ◽  
Hamidi Abdul Aziz ◽  
Mohd Suffian Yusoff
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Treatment Processes ◽  
By Products

Natural organic matter (NOM) in water reacts with chlorine or other disinfectants and form hazardous disinfectant by-products (DBPs). This study aimed to detect the presence of NOM in a conventional water distribution system using UV absorbance at 254 nm as a surrogate. Two water treatment plants were selected, namely, Jalan Baharu Water Treatment Plant (JBWTP) and Lubok Buntar Water Treatment Plant (LBWTP). Aside from determining the amount of NOM, the reduction of UV254after completing the series of treatments (coagulation, flocculation, sedimentation, filtration, and disinfection) was also observed. The presence of UV254in both raw water and treated water samples confirmed the presence of NOM. The concentration of UV254recorded at JBWTP and LBWTP were 0.14 and 0.13 cm−1, respectively. After the treatment processes, the concentration was reduced to 0.04 cm−1for JBWTP and 0.03 cm−1for LBWTP. These results indicated that the water supply in both plants contains DBP precursors and implied the possibility of DBP formation in the system. Moreover, the percentage reduction of UV254recorded were 69% and 75% for JBWTP and LBWTP, respectively.

scholarly journals Cascading effects of cyber-attacks on interconnected critical infrastructure

Cybersecurity ◽  
2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Venkata Reddy Palleti ◽  
Sridhar Adepu ◽  
Vishrut Kumar Mishra ◽  
Aditya Mathur
Keyword(s):  
Water Treatment ◽  
Distribution System ◽  
Water Distribution ◽  
Critical Infrastructure ◽  
Water Distribution System ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Cyber Attacks ◽  
Physical Systems ◽  
Cascading Effects

AbstractModern critical infrastructure, such as a water treatment plant, water distribution system, and power grid, are representative of Cyber Physical Systems (CPSs) in which the physical processes are monitored and controlled in real time. One source of complexity in such systems is due to the intra-system interactions and inter-dependencies. Consequently, these systems are a potential target for attackers. When one or more of these infrastructure are attacked, the connected systems may also be affected due to potential cascading effects. In this paper, we report a study to investigate the cascading effects of cyber-attacks on two interdependent critical infrastructure namely, a Secure water treatment plant (SWaT) and a Water Distribution System (WADI).

scholarly journals Pipe enlargement to satisfy concentration-time product for in-system disinfection in a water distribution system

2019 ◽  
Vol 9 (4) ◽  
pp. 601-607
Author(s):  
Margaret Neff ◽  
Brian D. Barkdoll
Keyword(s):  
Water Treatment ◽  
Distribution System ◽  
Contact Time ◽  
Water Distribution ◽  
Water Distribution System ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Water Age ◽  
Concentration Time ◽  
Concentration Levels

C*t is used as a metric for disinfection in a water treatment plant while inside a distribution system, the concentration alone is used. For systems without a treatment plant, however, chlorine may be added in the upstream portion of the system to disinfect water. Therefore, disinfection is increased at higher chlorine concentration levels but also with enough contact time to completely disinfect the water. Therefore the use of the C*t product as a metric in the distribution system, if no upstream treatment exists, is explored here through computer modeling. The network solver EPANET was used to simulate the C*t product using water age in a method introduced here. It was found in a demonstration project that increasing the mainline pipe diameter allows the water to slow down enough to allow the C*t product to fully disinfect the water prior to reaching the first users. Specifically, for the demonstration system analyzed, an 8-inch (203 mm) mainline diameter requires 1.0 mg/L of chorine addition at the upstream end to fully disinfect the water. This shows promise for the use of pipe enlargement as a disinfection method for systems with no water treatment plant.

Water treatment to reduce internal corrosion in the drinking water distribution system in Oslo

2001 ◽  
Vol 1 (3) ◽  
pp. 91-96 ◽  
Author(s):  
L.J. Hem ◽  
E.A. Vik ◽  
A. Bjørnson-Langen
Keyword(s):  
Water Treatment ◽  
Corrosion Rate ◽  
Distribution System ◽  
Water Distribution ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Corrosion Monitoring ◽  
Copper Corrosion ◽  
Iron Corrosion ◽  
Internal Corrosion

In 1995 the new Skullerud water treatment plant was put into operation. The new water treatment includes colour removal and corrosion control with an increase of pH, alkalinity and calcium concentration in addition to the old treatment, which included straining and chlorination only. Comparative measurements of internal corrosion were conducted before and after the installation of the new treatment plant. The effect of the new water treatment on the internal corrosion was approximately a 20% reduction in iron corrosion and a 70% reduction in copper corrosion. The heavy metals content in standing water was reduced by approximately 90%. A separate internal corrosion monitoring programme was conducted, studying the effects of other water qualities on the internal corrosion rate. Corrosion coupons were exposed to the different water qualities for nine months. The results showed that the best protection of iron was achieved with water supersaturated with calcium carbonate. Neither a high content of free carbon dioxide or the use of the corrosion inhibitor sodium silicate significantly reduced the iron corrosion rate compared to the present treated water quality. The copper corrosion rate was mainly related to the pH in the water.

Study on Phosphorus and Bacterial Regrowth in Drinking Water

2012 ◽  
Vol 461 ◽  
pp. 466-469
Author(s):  
Deng Ling Jiang ◽  
Yu Min Zhang ◽  
Ning Zheng
Keyword(s):  
Water Treatment ◽  
Distribution System ◽  
Water Distribution ◽  
Treatment Process ◽  
Water Distribution System ◽  
Phosphorus Concentration ◽  
Available Phosphorus ◽  
Source Water ◽  
Bacterial Regrowth ◽  
Water Treatment Process

Phosphorus limitation on bacterial regrowth was studied in source water, water treatment process and water distribution system of J Water Supply Plant in T city, by modified AOC method and MAP analysis. Based on the study, the follows can be concluded: ① MAP(Microbially Available Phosphorus) concentration was higher in source water and water treatment process, which was 5～38µg PO43－-P/L. However in water distribution, MAP concentration was lower, which was less than 5µg PO43--P/L. ②Coagulation and sedimentation can remove MAP efficiently. 31%～68% of MAP can be removed in these process. ③ In source water and water treatment process, there was no evident difference between AOCpotential, AOCp and AOCnative. So assimilable organic carbon (AOC) was the most important factor of bacterial regrowth. In water distribution system, the concentration of AOCpotential and AOCp were 2～8.7 times of the concentration of AOCnative. So phosphorus limited bacterial regrowth.

Specific Fluorescent Fingerprint of Organic Matter in Advanced Water Treatment and its Molecular Weight

2013 ◽  
Vol 448-453 ◽  
pp. 317-321 ◽  
Author(s):  
Jing Wen Cao ◽  
Shao Wei Liao ◽  
Chung Yi Chung ◽  
Hwa Sheng Gau ◽  
Chun Yen Chiu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Water Treatment ◽  
High Performance ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Excitation Wavelength ◽  
Source Water ◽  
Fluorescent Intensity ◽  
Treated Water

In this research, the UV absorbance values of wavelength at 210 and 254 nm, excitation emission fluorescent matrix were measured for source water and treated water in CCL (Cheng Ching Lake) water treatment plant during five months. The whole data produced from EEFM was analyzed by PARAFAC operated in MATLAB software. The variation of molecular weight for organic matter was measured by HPLC (high performance liquid chromatography) with UV and fluorescent detectors. Observed from the variation of UV210/UV254, high value in treated water compared with source water was found. More molecular weight less than 5 k Da was formed in the treated water with relative to source water. Also, both major components in source water were located at wavelengths of excitation/emission of 250/410 nm and 230/330 nm and those in treated water were 240/410 nm and 220/290 nm. Also, the fluorescent intensity, long excitation wavelength was higher than short excitation wavelength in source water. This phenomena was opposite with treated water.

Variations of DBPs precursors according to location within the distribution system

2009 ◽  
Vol 9 (4) ◽  
pp. 413-421
Author(s):  
C. Beaulieu ◽  
M. J. Rodriguez ◽  
J.-B. Sérodes
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Spatial Behavior ◽  
Haloacetic Acids ◽  
Formation Potential ◽  
The Impact ◽  
By Products

Little information is available on the evolution of remaining organic matter (ROM) in a water distribution system (WDS) and its impact on the generation of disinfection by-products (DBPs). This research involves the characterization, through sample fractionation processes and experimental chlorination tests, of the reactivity of DBP precursors occurring within a WDS. The study is based on samples collected in various locations of a WDS during a complete year. For each sample, six fractions were generated to determine their potential for formation of trihalomethanes (THMs) and haloacetic acids (HAAs). Fractionation processes on ROM demonstrated that the spatial behavior of precursors for THMs differs from that for precursors of HAAs. In addition, experimental chlorination tests showed that the reactivity of the investigated fractions, in terms of DBP formation potential (DBPfp), was different from each other according to location in the WDS. DBPfp for the studied fractions changed drastically during water treatment. However, changes of DBPfp for fractions were relatively low between the beginning and the extremity of the distribution system. Since the results of this research confirm that the ability to produce DBPs is related to the nature of the fractions, they could be useful to evaluate the impact of re-chlorination on DBP formation in a WDS.

scholarly journals Evaluation of Reservoir performance Clean Water Distribution in Putat Gede Graha Family

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Jonah Swanata ◽  
M Ikhsan Setiawan
Keyword(s):  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Network System ◽  
Clean Water ◽  
Reservoir Performance ◽  
Piped Water ◽  
Living Things

Water is one of the natural resources that is very important for the life of living things, and even becomes the main life for humans. With the existing treatment system and piping network system, Surya Sembada PDAM is expected to be able to meet the community’s clean water needs in Surabaya city. One og crucial things is the performance of reservoir in piped water distribution system from the clean water treatment plant. This study aims to evaluate the reservoir performance of the Surabaya PDAM, specifically the performance of Putat Gede reservoir, which is a distribution reservoir that serves the distribution of clean water to Graha Family Surabaya city. In this study Epanet 2.0 software was used as a hydrodynamic modelling tool. Based on the simulation result, at peak hours 07.00 a.m. reservoir Putat Gede is able to serve the community’s clean water needs. The farthest node has the lowest pressure of 15,45 m, and the lowest water level of the reservoir Putat Gede occurs at 09.00 a.m. which is 3 m. In general, the reservoir is still able to meet community’s clean water needs, especially during peak hours.

scholarly journals EVALUASI KINERJA RESERVOIR PADA JARINGAN DISTRIBUSI AIR BERSIH IPA I PDAM BANDARMASIH

2018 ◽  
Vol 4 (2) ◽  
Author(s):  
Elma Sofia ◽  
Rony Riduan ◽  
Endrico Pratama
Keyword(s):  
Water Treatment ◽  
Distribution System ◽  
Water Distribution ◽  
Treatment Plant ◽  
Water Distribution Network ◽  
Water Treatment Plant ◽  
Clean Water ◽  
Reservoir Performance ◽  
Piped Water ◽  
Regional Water

Air bersih merupakan kebutuhan dasar bagi manusia, sehingga pemenuhan kebutuhan air bersih merupakan hal yang wajib diperhatikan oleh PDAM (Perusahaan Daerah Air Minum) sebagai pihak terkait.  Dengan sistem pengolahan dan sistem jaringan perpipaan yang ada, PDAM Bandarmasih diharapkan mampu untuk memenuhi kebutuhan air bersih masyarakat yang ada di kota Banjarmasin.  Salah satu hal yang perlu diperhatikan adalah kinerja reservoir pada sistem distribusi perpipaan air bersih dari Instalasi Pengolahan Air Bersih (IPA) sampai kepada masyarakat. Penelitian ini bertujuan mengevaluasi kinerja reservoir PDAM Bandarmasih, khususnya kinerja reservoir S. Parman yang merupakan reservoir distribusi yang melayani distribusi air bersih ke zona 1 dan zona 4 wilayah layanan IPA (Instalasi Pengolahan Air) I PDAM Bandarmasih.  Pada penelitian ini digunakan perangkat lunak Epanet 2.0 sebagai alat bantu pemodelen hidrodinamika sistem distribusi air bersih.  Berdasarkan hasil simulasi dengan menggunakan Epanet 2.0, pada saat jam puncak 06.00 reservoir S. Parman mampu melayani kebutuhan air bersih masyarakat dan node terjauh mempunyai tekanan terendah 11,21 m dengan tinggi muka air terendah reservoir S. Parman terjadi pada jam 09.00 yaitu 0,75 m. Secara umum, reservoir masih mampu memenuhi kebutuhan air bersih pelanggan khususnya pada saat jam puncak. Kata kunci: Epanet, jaringan distribusi air bersih, PDAM, reservoir.   Clean water is a basic need for humans, requirement of clean water is considered important by the PDAM (Regional Water Company) as a related party. With the existing treatment system and piping network system, Bandarmasih PDAM is expected to be able to meet the community's clean water needs in Banjarmasin city. One of crucial things is the performance of reservoir in piped water distribution system from the Clean Water Treatment Plant.This study aims to evaluate the reservoir performance of the Bandarmasih PDAM, specifically the performance of S. Parman reservoir, which is a distribution reservoir that serves the distribution of clean water to zone 1 and zone 4 of the Water Treatment Plant (IPA) I PDAM Bandarmasih. In this study Epanet 2.0 software was used as a hydrodynamic modelling tool. Based on the simulation results, at peak hours 06.00 a.m. reservoir S. Parman is able to serve the community's clean water needs. The farthest node has the lowest pressure of 11.21 m, and the lowest water level of the reservoir S. Parman occurs at 09.00 a.m. which is 0.75 m. In general, the reservoir is still able to meet community's clean water needs, especially during peak hours. Keywords: reservoir, clean water distribution network, Epanet, PDAM

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