The Occurrence and Control of Iron Bacteria in Water Supplies

1934 ◽  
Vol 26 (11) ◽  
pp. 1684-1698 ◽  
Author(s):  
K. W. Brown
Keyword(s):  
Water Supplies ◽  
Iron Bacteria ◽  
And Control

Clogging Problems in Groundwater Heat Pump Systems in Sweden

1988 ◽  
Vol 20 (3) ◽  
pp. 133-140 ◽  
Author(s):  
Annika Lindblad-Påsse
Keyword(s):  
Redox Potential ◽  
Heat Pump ◽  
Hydrogen Sulphide ◽  
Sludge Formation ◽  
Iron Bacteria ◽  
Iron Precipitation ◽  
Water Composition ◽  
Groundwater Heat Pump ◽  
And Control ◽  
System Knowledge

A number of groundwater heat pump systems have been investigated to determine the extent of problems caused by the chemistry of the groundwater used. The main purpose was to investigate sites using iron rich groundwater. Fifteen facilities were studied regularly for three years. Ten of these facilities had some kind of problem caused by iron precipitation. Four of the sites were rebuilt because of severe plugging due to iron sludge in wells, pumps and pipes. In all facilities with severe problems, iron bacteria were found. Low redox potential, indicated by hydrogen sulphide in the groundwater, seems to protect from iron bacteria. In some of the systems using groundwater with H2S the problems were corrosion and sludge formation caused by sulphur oxidizing bacteria. Rapid clogging was caused by aeration of the groundwater due to improper design of the system. Knowledge of the water composition, design of the systems to minimize aeration, and control of clogging turned out to be important factors to maintain operation safety.

scholarly journals Managed Aquifer Recharge at a Farm Level: Evaluating the Performance of Direct Well Recharge Structures

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1069 ◽  
Author(s):  
Prahlad Soni ◽  
Yogita Dashora ◽  
Basant Maheshwari ◽  
Peter Dillon ◽  
Pradeep Singh ◽  
...  
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Water Levels ◽  
Water Supplies ◽  
E Coli ◽  
Significant Difference ◽  
Dug Wells ◽  
And Control ◽  
Dug Well ◽  
Recharge Structures

A field study evaluated the performance of direct well recharge structures (DWRS) in order to harvest and filter farm runoff and its discharge into open dug wells to augment groundwater recharge. This was undertaken between 2016 and 2018 using a total of 11 wells in the Dharta watershed, situated in a semi-arid hardrock region of Udaipur district, Rajasthan, India. The depth to water level in each DWRS well was monitored weekly for 1 to 3 years before and after the DWRS was established, and water samples were taken for water quality analysis (pH, electrical conductivity (EC), total dissolved solids (TDS), turbidity, fluoride, and Escherichia coli) before and during the monsoon period. For each DWRS well, two control wells in close proximity were also monitored and sampled. Five of the DWRS established in 2018 also had flow meters installed in order to measure discharge from the filter to the well. The volume of water recharged through DWRS into individual wells during the 2018 monsoon ranged from 2 to 176 m3 per well. Although the mean rise in water levels over the monsoon was higher in DWRS wells than in nearby control wells, the difference was not significant. Values of pH, EC, TDS, and F decreased in DWRS and control wells as each monsoon progressed, whereas the turbidity of wells with DWRS increased slightly. There was no significant difference between DWRS and control wells for pH, EC/TDS, turbidity, or fluoride. The presence of E. coli in DWRS wells was higher than in control wells, however, E. coli exceeded drinking water guidelines in all sampled wells. On the basis of this study, it is recommended that rural runoff should not be admitted to wells that are used for, or close to, wells used for drinking water supplies, even though salinity and fluoride concentrations may be reduced. For this study, none of the 11 DWRS wells produced sufficient additional recharge to potentially increase dry season irrigation supplies to justify expenditure on DWRS. This even applies to the DWRS well adjacent to a small ephemeral stream that had a significantly larger catchment area than those drawing on farmers’ fields alone. An important and unexpected finding of this study was that no sampled open dug well met drinking water standards. This has led to a shift in local priorities to implement well-head water quality protection measures for wells used for drinking water supplies. It is recommended that parapet walls be built around the perimeter of such dug wells, as well as having covers be installed.

scholarly journals Hepatitis E in Pakistan

2021 ◽  
Vol 2 (1) ◽  
pp. 121-128 ◽  
Author(s):  
Iftikhar A. Malik ◽  
Waheed Uz Tariq
Keyword(s):  
Clinical Features ◽  
Prevention And Control ◽  
Hepatitis E ◽  
Water Supplies ◽  
Sporadic Cases ◽  
And Control

In Pakistan, sporadic cases of hepatitis E occur throughout the year. However, small outbreaks and epidemics of hepatitis E have been reported from the cities of Peshawar, Mardan, Abbottabad, Rawalpindi-Islamabad, Sargodha, Multan, Hyderabad, Quetta and Karachi. A large epidemic of hepatitis E occurred in one of the army garrisons at Lahore in early 1995, when more than 600 cases were treated as inpatients. Wherever epidemiological investigations have been carried out, the cause of the outbreak has always been found to be contamination of water supplies with sewage. This paper considers the epidemiology, diagnosis, clinical features, treatment, prevention and control of hepatitis E in Pakistan

QUICK CULTURING AND CONTROL OF IRON BACTERIA

1969 ◽  
Vol 61 (5) ◽  
pp. 242-245 ◽  
Author(s):  
J. W. Grainge ◽  
E. Lund
Keyword(s):  
Iron Bacteria ◽  
And Control

Particle counters as tools for managing Cryptosporidium risk in water treatment

1997 ◽  
Vol 36 (4) ◽  
pp. 143-149 ◽  
Author(s):  
Tom Hall ◽  
Brian Croll
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Operating Conditions ◽  
Water Supplies ◽  
Treatment Processes ◽  
Particle Counting ◽  
Particle Counts ◽  
The Uk ◽  
And Control

Outbreaks of waterborne cryptosporidiosis have been a major concern for the Water Industry in the UK and US over the past ten years. Management of risk from Cryptosporidium in water supplies relies heavily upon operation and control of water treatment processes to maximise oocyst removal. Difficulties in measuring oocyst concentrations in water supplies have led to evaluation of surrogate parameters with which to assess oocyst removal by treatment. Whilst turbidity measurement can give an indication of the risk of oocyst breakthrough from filters, a more sensitive indicator appears to be particle counts in filtered water. The paper gives a demonstration of the potential for particle counting as a tool for managing Cryptosporidium risk, and describe ways in which particle counting can be used for monitoring and controlling water treatment plant operation. With the present level of knowledge, the most suitable application for particle counting is as a diagnostic tool for the identification of operating conditions which reduce or minimise particle counts in filtered water at individual sites.

Occurrence and Control of Atrazine in Midwestern Surface Water Supplies

2004 ◽  
pp. 356-394
Author(s):  
Stephen Randtke ◽  
Aaron Witt ◽  
Patricia Adams ◽  
Richard Pancake ◽  
Craig Adams
Keyword(s):  
Surface Water ◽  
Water Supplies ◽  
And Control

Detection and Enumeration of Iron Bacteria in Municipal Water Supplies

1962 ◽  
Vol 54 (6) ◽  
pp. 751-756 ◽  
Author(s):  
Lloyd A. Lueschow ◽  
Kenneth M. Mackenthun
Keyword(s):  
Water Supplies ◽  
Iron Bacteria ◽  
Municipal Water

Odourous algal-derived alkenes: differences in stability and treatment responses in drinking water

2007 ◽  
Vol 55 (5) ◽  
pp. 95-102 ◽  
Author(s):  
T. Satchwill ◽  
S.B. Watson ◽  
E. Dixon
Keyword(s):  
Drinking Water ◽  
Algal Blooms ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Raw Water ◽  
Water Supplies ◽  
Volatile Organic ◽  
Public Drinking Water ◽  
Treatment Responses ◽  
And Control

Drinking water supplies are often impacted by taste and odour (T/O) episodes caused by algal volatile organic compounds (AVOCs) from algal blooms. Treatment and control of these events is important to utility operators, as customer confidence in the safety of public drinking water supplies is based primarily on their palatability and odour. To manage T/O outbreaks successfully, knowledge about treatment responses of AVOCs and anticipation of their outbreaks are thus of major importance to the water industry. The Glenmore Reservoir and water treatment plant (GWTP) supplies drinking water to over 50% of the ca. 1 million consumers in Calgary (Alberta). Despite low nutrients and high raw water quality, the reservoir experiences periodic outbreaks of fishy/floral T/O, caused by chrysophytes and diatoms (Uroglena americana, Dinobryon spp., Synura petersenii, Asterionella formosa). These odours are produced by the unsaturated C7–C10 alkenes 2,4-heptadienal, 2,4,7-octatriene, 2,4-decadienal and 2,4,7-decatrienal, generated during from the enzymatic breakdown of algal polyunsaturated fatty acids (PUFAs). The formation, persistence and stability of these compounds in both the raw water and treatment plant is not well understood.

Control of Metal Alloy Oxidation with Electric Fields

1973 ◽  
Vol 31 ◽  
pp. 164-165
Author(s):  
R. R. Dils ◽  
P. S. Follansbee
Keyword(s):  
Electric Fields ◽  
Oxidation Process ◽  
Base Alloy ◽  
Oxide Surface ◽  
Platinum Electrodes ◽  
Insulating Layer ◽  
Iron Base Alloy ◽  
Alloy Oxidation ◽  
Aluminum Oxide Layer ◽  
And Control

Electric fields have been applied across oxides growing on a high temperature alloy and control of the oxidation of the material has been demonstrated. At present, three-fold increases in the oxidation rate have been measured in accelerating fields and the oxidation process has been completely stopped in a retarding field.The experiments have been conducted with an iron-base alloy, Pe 25Cr 5A1 0.1Y, although, in principle, any alloy capable of forming an adherent aluminum oxide layer during oxidation can be used. A specimen is polished and oxidized to produce a thin, uniform insulating layer on one surface. Three platinum electrodes are sputtered on the oxide surface and the specimen is reoxidized.

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