Assessment of Sediment Arsenic and Iron Occurrence and Leaching Potential in a Potable Water Treatment Wastewater Stabilization Pond System

2021 ◽  
Author(s):  
Ali Ekhlasi Nia ◽  
Harrison Bull ◽  
Mohsen Asadi ◽  
Kerry McPhedran
Keyword(s):  
Water Treatment ◽  
Potable Water ◽  
Drinking Water Treatment ◽  
Overlying Water ◽  
Leaching Potential ◽  
Water Treatment Plants ◽  
Kd Values ◽  
Leaching Experiments ◽  
Wastewater Stabilization Ponds ◽  
Potable Water Treatment

Wastewater stabilization ponds (WSPs) are commonly used to reduce wastewater metal(loid) concentrations from drinking water treatment plants (DWTPs) through sedimentation. However, this results in increased sediment concentrations that can be released back into the overlying water. Thus, our goal was to evaluate the WSP metal(loid)s occurrence and leaching potential. Currently, a Saskatchewan based DWTP’s WSP system was investigated given historically elevated effluent As and Fe concentrations. The WSP consists of five ponds that were sampled on six occasions in 2019 and 2020. In addition, sediments were used in laboratory-based experiments to determine their leaching potential. Overall, the sediments were found to contain elevated concentrations of As and Fe with 25 to 400 and 10,000 to 45,000 mg/kg, respectively. Leaching experiments indicated that the pond sediments could potentially release As and Fe with log Kd values ranging from 2.21 to 4.31 L/kg, while Fe ranged from 3.32 to 5.53 L/kg.

Determination of natural radionuclides in waste generated in the potable water treatment plants of the Zona da Mata of the state of Pernambuco- Brazil

2019 ◽  
Vol 7 (2A) ◽  
Author(s):  
Adriana Muniz De Almeida Albuquerque
Keyword(s):  
Water Treatment ◽  
Potable Water ◽  
Natural Radionuclides ◽  
The United States ◽  
Radioactive Material ◽  
Human Consumption ◽  
Radiological Protection ◽  
Natural Occurrence ◽  
Water Treatment Plants ◽  
Potable Water Treatment

The water purification procedure aims to obtain a product appropriate for human consumption, minimizing the presence of contaminants and toxic substances present in the water. Among these contaminants, some radionuclides of natural origin, such as uranium, thorium and their descendants, have been identified. Studies have shown that the stages of purification are quite effective in removing the radionuclides contained in water. The removal is due to co-precipitation of the radionuclides with the suspended materials and the precipitated material is accumulated and characterized as a Technologically Concentrated Natural Occurrence Radioactive Material (TENORM) by the United States Environmental Protection Agency (USEPA). This residue can present significant levels of radioactivity and, when discarded in the environment without any treatment, can generate a problem of environmental impact and a risk to the health of the population. In this way, some gamma emitters of the series of U, Th and the K-40 were determined in the residues generated at the Potable Water Treatment Plants – PWTPs in six municipalities of Pernambuco. The results obtain corroborate the classification of the residues generated in the PWTPs as concentrators of the radioactive components contained in the water supplied to the system and reinforce the need for the release to the environment, which is the usual way of disposal of this waste, to be carried out only after considering the radiological protection standards established.

scholarly journals Evaluation of high rate sedimentation lab-scale tank performance in drinking water treatment

2018 ◽  
pp. 9-15
Author(s):  
Claudia Patricia Vesga-Rodríguez ◽  
Leonardo David Donado-Garzón ◽  
Monroe Weber-Shirk
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Potable Water ◽  
Low Cost ◽  
Drinking Water Treatment ◽  
High Rate ◽  
Upward Flow ◽  
Cornell University ◽  
Energy Dependent ◽  
Potable Water Treatment

The Cornell University AguaClara program researches ways to improve the process of potable water treatment at low cost and no energy dependent. A High Rate  Sedimentation (HRS) process that uses upward flow and less area than traditional tanks was investigated. The objective was to analyze parameters affecting HRS tank performance including velocity, density of the floc blanket and location of plate settlers in a laboratory scale HRS tank. Different velocities were set during the experiment, and the resulting performance of the floc blanket was evaluated through continuous turbidity measurements. Results demonstrated that the lab-scale tank allows the creation of a floc blanket and is a versatile design with constraints of visibility and accessibility. In addition, performance of the sedimentation tank improves at lower up flow velocities; however, the study suggests that plate settlers at the top of the tank stabilized the floc blanket at higher velocities, as a consequence of denser floc blankets created by the plates.

scholarly journals PENYEDIAAN AIR SIAP MINUM PADA SITUASI TANGGAP DARURAT BENCANA ALAM (Belajar Dari Kasus Gempa Bumi Yogyakarta Dan Jawa Tengah)

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Robertus Haryoto Indriatmoko ◽  
Wahyu Widayat
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Potable Water ◽  
High Mobility ◽  
Drinking Water Treatment ◽  
Treatment Unit ◽  
Treatment Processes ◽  
Disaster Area ◽  
The Impact ◽  
Potable Water Treatment

A response in an emergency condition  is the most critical thing in natural disaster. In this situation, every thing is in a panic. Any decision must be taken  tactically, quickly and property to minimize the number victims and severity as the impact of disaster. One of the response in an emergency is to provide facility of drinking water treatment unit which has to be located at the respective disaster area. This unit is designed compacly with high mobility, flexible and easily operated to fullfil the potable water need for the victims. The treatment processes use are filtration, adsorbtion and sterilization. The capacity is 1 M3/hour.      Katakunci : Tanggap darurat, air minum, ultra filtrasi,  bencana alam, mobilitas tinggi, tepat sasaran, emergency use, potable water treatment.

scholarly journals Life cycle assessment of four potable water treatment plants in northeastern Colombia

2016 ◽  
Vol 11 (2) ◽  
pp. 268 ◽  
Author(s):  
Oscar Orlando Ortíz Rodriguez ◽  
Raquel Amanda Villamizar-Gallardo ◽  
Rafael Guilhermo García
Keyword(s):  
Drinking Water ◽  
Life Cycle Assessment ◽  
Life Cycle ◽  
Water Treatment ◽  
Potable Water ◽  
Stratospheric Ozone ◽  
Public Utility ◽  
Treatment Processes ◽  
Water Treatment Plants ◽  
Potable Water Treatment

There is currently great concern about the processes that directly or indirectly contribute to the potential for global warming, such as stratospheric ozone depletion or acidification. In this context, and provided that treated water is a basic public utility in urban centers around the world as well as in some rural areas, its impact on the environment is of great interest. Therefore, this study applied the environmental methodology of Life Cycle Assessment (LCA) to evaluate the environmental loads of four potable water treatment plants (PWTPs) located in northeastern Colombia following the international guidelines delineated in ISO 14040. The different stages of the drinking water process were thoroughly assessed, from the catchment point through pumping to the distribution network. The functional unit was defined as 1 m3 of drinking water produced at the plant. The data were analyzed through the database Ecoinvent v.3.01, and modeled and processed in the software LCA-Data Manager. The results showed that in plants PLA-CA and PLA-PO, the flocculation process has the highest environmental load, which is mostly attributable to the coagulant agent, with a range between 47-73% of the total impact. In plants PLA-TON and PLA-BOS, electricity consumption was identified as the greatest impact source, with percentages ranging from 67 to 85%. Treatment processes and techniques, bioclimatic conditions and culturally driven consumption behavior varied from region to region. Furthermore, changes in treatment processes and techniques are likely to affect the environment during all stages of a plant’s operational cycle.

Potential N-nitrosodimethylamine (NDMA) formation from amine-based water treatment polymers in the reactions with chlorine-based oxidants and nitrosifying agents

2009 ◽  
Vol 9 (3) ◽  
pp. 279-288 ◽  
Author(s):  
Sang-Hyuck Park ◽  
Piti Piyachaturawat ◽  
Amelia E. Taylor ◽  
Ching-Hua Huang
Keyword(s):  
Water Treatment ◽  
Chlorine Dioxide ◽  
Potable Water ◽  
Reaction Times ◽  
Drinking Water Treatment ◽  
Free Chlorine ◽  
Diallyldimethylammonium Chloride ◽  
Mechanistic Insight ◽  
Opposite Order ◽  
Potable Water Treatment

The NDMA formation potential (NDMA FP) of four commonly used amine-based cationic water treatment polymers was assessed in reactions with chlorine-based oxidants (free chlorine, monochloramine and chlorine dioxide) and nitrosifying agents (nitrite and nitrate). Relatively high dosages of polymers were directly exposed to oxidants for long reaction times in the FP tests to assess the potential to form NDMA and obtain mechanistic insight. Results show that the NDMA FP of the polymers generally follows the trend of aminomethylated polyacrylamide (Mannich polymer)>>poly(epichlorohydrin-dimethylamine) (polyamine) > poly(diallyldimethylammonium chloride) (polyDADMAC) > cationic polyacrylamide copolymer (cationic PAM). The high NDMA FP of Mannich polymer was largely due to the high amount of dimethylamine (DMA) residue in the polymer solution. For the other three polymers, the DMA concentration was increased after oxidation, indicating polymer degradation, and the trend of DMA increase agreed with that of NDMA FP. Among the oxidants, NDMA formation followed the order of monochloramine > free chlorine > chlorine dioxide, despite that the DMA release from the polymers caused by the oxidant followed the opposite order. At equal dosages, nitrite and nitrate generated NDMA from the polymers at levels comparable to those by free chlorine and chlorine dioxide; even so, the nitrosifying agents are unlikely to contribute significantly to NDMA formation due to expected lower concentrations in drinking water treatment systems. Jar tests followed by monochloramination of real water samples using conditions in line with those at potable water treatment plants generally showed relatively small contributions from polyamines and polyDADMACs to the overall NDMA formation.

The Characteristics of Chitosan Applied in Drinking Water Treatment

2011 ◽  
Vol 233-235 ◽  
pp. 638-643
Author(s):  
Shao Xiu Li ◽  
Shu Jie Hu ◽  
Dong Mei Li ◽  
Wei Wei Duan ◽  
Wen Qin Xia ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Potable Water ◽  
Specific Property ◽  
Drinking Water Treatment ◽  
Cationic Polymer ◽  
Flocculation Mechanism ◽  
Dissolved Organics ◽  
The Relationship ◽  
Potable Water Treatment

Chitosan is a kind of natural, non-toxic and harmless substance. After its amino-group protonizing, it can form a cationic polymer which has excellent coagulation/flocculation properties. The application of chitosan in potable water treatment for the removal of particulates and dissolved organics has been studied extensively in the last decade. In order to further understand the specific property of chitosan applied in drinking water treatment, this paper introduces the effect of molecule weight and deacetylation of chitosan on coagulation/flocculation and coagulation/flocculation mechanism in drinking water treatment, gives an overview of chitosan characteristics of removal of suspend solids, organics and bacteria in water, particularly, describes the relationship between the removal efficiency of above impurities by chitosan and pH, dosage of chitosan.

Use of recycled crushed glass as a filtration medium in municipal potable water treatment plants

2002 ◽  
Vol 2 (5-6) ◽  
pp. 9-16 ◽  
Author(s):  
G. Evans ◽  
P. Dennis ◽  
M. Cousins ◽  
R. Campbell
Keyword(s):  
Water Treatment ◽  
Pilot Plant ◽  
Potable Water ◽  
Physical Parameters ◽  
Recycled Glass ◽  
Water Treatment Plants ◽  
Water Rates ◽  
Treatment Application ◽  
Filtration Medium ◽  
Potable Water Treatment

The aim of this study was to investigate the use of recycled crushed glass as a filtration medium for municipal potable water treatment plants. It evaluated the main physical parameters of recycled glass and its performance in a potable water treatment application. Pilot-plant testing was used to compare the performance of recycled glass to a typical sand filter medium in a conventional treatment process. Laboratory analysis was used to determine media characteristics. Pilot-plant testing determined that the filtration performance of the glass medium was similar to that of a typical sand medium of similar effective size and uniformity under all conditions tested. The glass medium had the benefit of taking 10-15% longer than the sand to reach particle breakthrough. The glass also appeared to accumulate headloss in most runs at a slightly lower rate than the sand. Backwashing observed during pilot-plant testing also showed that the glass expanded more than the sand under the same backwash water rates. This was noted to be a potential benefit to installations that have low backwash water flow.

Assessment of a wastewater stabilization pond system for removal of arsenic, iron, and ammonia from reverse osmosis water treatment plant residual wastewater

2021 ◽  
Author(s):  
Harrison Bull ◽  
Ali Ekhlasi Nia ◽  
Mohsen Asadi ◽  
Kerry McPhedran
Keyword(s):  
Heavy Metals ◽  
Drinking Water ◽  
Water Treatment ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Depth Data ◽  
Water Treatment Plants ◽  
Removal Of Arsenic ◽  
Wastewater Stabilization Ponds

Drinking water treatment plants (DWTPs) produce wastewaters with elevated concentrations of heavy metals, metalloids, ammonia, and other contaminants. These wastewaters require treatment via processes including wastewater stabilization ponds (WSPs). This study assessed the arsenic (As), iron (Fe), and ammonia (NH3) concentrations in a Saskatchewan DWTP WSP system of five sequential ponds. Drone imaging combined with flow and depth data was used to estimate retention times which increased from 7-9 to 8-10 days after the DWTP upgrade. Concentration trends showed Fe decreased from Pond 1 to 3 and increased in Ponds 3 and 5, while As decreased from Pond 1 to 5. Average effluent As concentrations of 10.6 µg/L were over the 5.0 µg/L guideline, while both Fe and NH3 concentrations guidelines were easily met post-upgrade in 2020. Several actions are recommended to ensure adequate WSP operation including dredging, aeration, and installing macrophytes capable of As uptake.

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