Monitoring of a pilot GFO filter for removal of low-concentration arsenic in water

2016 ◽  
Vol 11 (4) ◽  
pp. 702-711 ◽  
Author(s):  
Collivignarelli Maria Cristina ◽  
Canato Matteo ◽  
Sorlini Sabrina ◽  
Crotti Barbara Marianna
Keyword(s):  
Water Treatment ◽  
Ferric Oxide ◽  
Arsenic Removal ◽  
Arsenic Concentration ◽  
Specific Treatment ◽  
Cost Effective ◽  
Water Treatment Plants ◽  
Groundwater Arsenic ◽  
Treatment Stage ◽  
Iron And Manganese

Many water treatment plants (WTPs) were designed to remove ammonia, iron, and manganese simultaneously using biofilters. In some cases (especially in the Pianura Padana area, in Italy) such plants were designed without a specific treatment stage for arsenic removal because its concentration in the groundwater (i.e. 10 to 20 μg/L) was lower than the previous maximum contaminant level (MCL) of 50 μg-As/L; therefore, specific treatments for arsenic removal must be introduced or upgraded in WTPs. In this work, the results of a 19-month monitoring campaign are reported for a pilot granular ferric oxide (GFO) filter installed in an Italian WTP as a polishing stage. The aim was to investigate the performance of GFO with low arsenic concentrations. The results show that, if the groundwater arsenic concentration is close to the MCL, GFO treatment can be cost effective (approximately 80,000 bed volumes have been treated). It was confirmed that GFO can be effective for the removal of both As(III) and As(V) species.

scholarly journals Recirculation of sludge-water in the water treatment process – a pilot study

2018 ◽  
Vol 13 (3) ◽  
pp. 461-468
Author(s):  
Tomáš Kučera ◽  
Veronika Hanušová
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Specific Treatment ◽  
Oxygen Demand ◽  
Water Volume ◽  
Raw Water ◽  
Water Treatment Process ◽  
Waste Water Management ◽  
Iron And Manganese

Abstract This paper presents the results of the first phase of research that evaluates options for the optimization of waste-water management during water treatment. The research was conducted in a specific treatment plant, with surface-water sources, to verify the option of recirculating part of the sludge-water back to the beginning of the technological line and mixing this with a portion of raw water. An evaluation of risk factors is necessary for such treatment, as they could render the recirculation of the backwashing water impossible. The motivation behind this research lies in the potential savings of operating costs, particularly the costs of pumping raw water from a watercourse. This research evaluated data regarding the quality of both raw and processed water, focusing on six indicators – turbidity, color, chemical oxygen demand, and concentrations of aluminum, iron and manganese. The evaluation established through these factors indicates that the plan for returning a certain volume of sludge-water back into the process is possible and should cause no problems regarding the quality of drinking water produced. Based on the results of the first phase of this research, it is possible to recirculate up to 6% of overall raw-water volume back into the process.

scholarly journals Monitoring the characteristics and removal of natural organic matter fractions in selected South African water treatment plants

2020 ◽  
Vol 15 (4) ◽  
pp. 932-946
Author(s):  
Welldone Moyo ◽  
Nhamo Chaukura ◽  
Machawe M. Motsa ◽  
Titus A. M. Msagati ◽  
Bhekie B. Mamba ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Specific Treatment ◽  
Ultra Violet ◽  
Correlation Spectroscopy ◽  
Operational Parameters ◽  
Gaussian Peak ◽  
Coastal Plants ◽  
Water Treatment Plants

Abstract This study used spectroscopic methods to investigate the fate and dynamics of natural organic matter (NOM) as it traverses the treatment train at three water treatment plants (WTPs) in South Africa. The character, quantity, and removability of NOM at specific treatment stages was investigated by measuring changes in dissolved organic carbon (DOC) concentration, specific ultra-violet absorbance, UV absorbance, various spectroscopic indices, and maximum fluorescence intensity levels. A novel method of identifying and quantifying fluorescent fractions by combining synchronous fluorescence spectroscopy (SFS) and Gaussian peak fitting is presented. The dynamics of NOM removal were modeled using 2D-SFS correlation spectroscopy. Humic and fulvic substances dominated coastal plants and were the most amenable for removal by coagulation as shown by Hermanus WTP (plant H), which had a 42% DOC removal at the coagulation stage. Tyrosine-like, tryptophan-like and microbial humic-like substances were degraded or transformed concurrently at plant Flag Bushiole (FB) whereas, at plant H, fulvic-like matter was transformed first followed by tyrosine-like then humic-like matter. Through 2D-SFS, this study revealed that NOM transformation was varied as a consequence of NOM character, the type and dosage of treatment chemicals used, and WTPs operational parameters.

A systematic approach to optimal upgrading of water and waste water treatment plants

1998 ◽  
Vol 37 (9) ◽  
pp. 9-16 ◽  
Author(s):  
Björn Rosén ◽  
Stig Morling
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Systematic Approach ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Cost Effective ◽  
Efficient Implementation ◽  
Local Conditions ◽  
Effective Implementation ◽  
Water Treatment Plants

Most of the future works in water and waste water treatment systems will involve the upgrading of existing facilities, for better performance and/or higher capacity. For the efficient implementation of any project, an upgrading strategy should be used, based on careful studies of the local conditions and the defined objectives to be reached. The paper presents a systematic approach to upgrading with emphasis on treatment plant extension, without investing in large volumes, by more efficient use of existing facilities, illustrated by some cases. The importance of real competition in obtaining a cost-effective implementation is stressed.

scholarly journals Performance of Treated Sludge as a Replacement of Fine Aggregate in Construction Application

2020 ◽  
Vol 9 (1) ◽  
pp. 354-356
Keyword(s):  
Water Treatment ◽  
Construction Material ◽  
Construction Materials ◽  
Treatment Plant ◽  
Cost Effective ◽  
Water Treatment Plant ◽  
Fine Aggregate ◽  
Water Treatment Process ◽  
Water Treatment Plants ◽  
Reuse Options

Large quantities of sludge are produced during the conventional processes of coagulation, flocculation and sedimentation in water treatment plants. The volume of sludge generated during water treatment process can be as high as 2% of the total volume of water treated. The cost of treatment and the disposal of the sludge plays a significant part of a water treatment plant. As the disposal of sludge produced from water treatment plants is highly expensive and difficult, valuable reuse options have been proposed to remove the sludge. In India, there are numerous emanating treatment plants bringing about mounting of sludge. It is very difficult and expensive to transfer the sludge from treatment plant. The more waste generated by the plants creates environmental problems of toxic threat. The treated waste sludge materials can be used as a replacement of fine aggregate to minimize the landfills is one of a cost-effective solution to this problem. There is a lack of conventional construction materials such as cement, fine aggregate and coarse aggregate due to the rapid increase in construction activities. To find replacement materials in construction many research have been conducted. The usage of treated sludge as a fine aggregate in construction material is an environmentally friendly option for the disposal sludge generated by water treatment industry.

Soluble arsenic removal at water treatment plants

1995 ◽  
Vol 87 (4) ◽  
pp. 105-113 ◽  
Author(s):  
Laurie S. McNeill ◽  
Marc Edwards
Keyword(s):  
Water Treatment ◽  
Arsenic Removal ◽  
Water Treatment Plants

scholarly journals Current Stage of Knowledge Relating to the Use Ferruginous Sludge From Water Treatment Plants – a Preliminary Review of the Literature

Mineralogia ◽  
2017 ◽  
Vol 48 (1-4) ◽  
pp. 39-45 ◽  
Author(s):  
Magdalena Wołowiec ◽  
Tomasz Bajda
Keyword(s):  
Water Treatment ◽  
Municipal Wastewater ◽  
Preliminary Review ◽  
Raw Water ◽  
Review Of The Literature ◽  
The Past ◽  
Water Treatment Plants ◽  
Materials Used ◽  
Current Stage ◽  
Iron And Manganese

Abstract In water treatment plants, a large amount of wastewater and sludge is generated during the processing of drinking water. The composition of the sludge is determined by the type and raw water chemistry, as well as the methods and materials used for purification. The major components of the sludge are iron and manganese oxyhydroxides. In the past, the sludge was landfilled, but for environmental reasons it became necessary to find uses for the sludge. The aim of this study was to identify examples of using this sludge. Nowadays, the sludge is applied in the treatment of municipal wastewater, agriculture, and the production of cement and bricks, among others. Attention was also paid to the possibility of using the water processing sludge in different sorption applications.

Local innovation for application of membrane system for supply of arsenic-safe water in rural Bangladesh

2019 ◽  
pp. 35-42
Author(s):  
Tashfia Aktar ◽  
Hossain Barsha ◽  
Fardeen Arafat ◽  
Nadim Reza Khandaker ◽  
Barsha Hossain
Keyword(s):  
Arsenic Removal ◽  
Produced Water ◽  
Low Cost ◽  
Arsenic Concentration ◽  
Cost Effective ◽  
Membrane System ◽  
Hydraulic Pressure ◽  
Rural Bangladesh ◽  
The People ◽  
Removal Technologies

Over seventy million people in Bangladesh are drinking arsenic contaminated water. There is a lack of available sustainable arsenic removal technologies in the rural Bangladesh. This paper reports on a successful retrofit that allows for readily available, cost effective and dependable membrane system application for arsenic removal in rural Bangladesh. The retrofit is very simple, overcoming the limitation of a hydraulic pressure by a low cost pump placement in line to the membrane system. The system was field tested in a well with high arsenic concentration 0.1 mg/L (Government of Bangladesh Limit is 0.05 mg/L), along with high iron and hardness. In the field trial, the retrofitted technology was successful and produced water that does not contain any arsenic (0.0 mg/L), low in iron, and low in hardness. The system cost, along with the retrofitting, is only a hundred and seventy US dollars, a sum within the reach of many in Bangladesh. It is also important to note that we are using an existing technology available off the shelf and retrofitting it using locally available materials. The work reported in the paper will create a significant impact relief to the people in the arsenic affected regions of Bangladesh.

Survey on full-scale drinking water treatment plants for arsenic removal in Italy

2014 ◽  
Vol 9 (1) ◽  
pp. 42-51 ◽  
Author(s):  
S. Sorlini ◽  
F. Gialdini ◽  
M. C. Collivignarelli
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Arsenic Removal ◽  
Ferric Hydroxide ◽  
Drinking Water Treatment ◽  
Chemical Precipitation ◽  
Ionic Form ◽  
Ionic Exchange ◽  
Water Characteristics ◽  
Water Treatment Plants

Arsenic in drinking water causes severe health effects and it is widely diffused in groundwater around the world. This paper presents the results of a survey about the main arsenic removal technologies employed in Italy and the main features in the management of real treatment plants. 19 drinking water treatment plans were involved in this study. The specific aspects analysed in this survey were: type of technologies applied in the drinking water treatment plants (water characteristics, ionic form of As in raw water, etc.), technical aspects (chemical dosage, treatment steps, hydraulic load, retention time, etc.), operational aspects (backwashing, media regeneration, management of residues, etc.) and costs of these technologies. In Italy, the main technologies employed are chemical precipitation (10 plants) and adsorption with granular ferric hydroxide (GFH) (six plants). Two of these plants employ both chemical precipitation and GFH. Moreover, there are some applications of adsorption on titanium dioxide (two plants), reverse osmosis (two plants) and ionic exchange (two plants).

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