scholarly journals Environmental friendly flocculants for drinking water treatment

2021 ◽  
Vol 3 (1) ◽  
pp. 49-54
Author(s):  
Mihai Stefanescu ◽  
◽  
Laurentiu Dinu ◽  
Costel Bumbac
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Surface Water ◽  
Aluminum Sulfate ◽  
Research Work ◽  
Drinking Water Treatment ◽  
Organic Load ◽  
Initial Surface ◽  
Water Turbidity ◽  
Environmental Friendly

Coagulation-flocculation is an important step for the treatment of drinking water obtained from surface water sources. Various types of flocculants are available in the drinking water treatment market but only some of them are friendly for the environment due to their specific structure, which includes natural compounds. Starch-based flocculants are included in this category and some types of them were tested in our research work, in similar conditions with ordinary polyelectrolytes, in order to prove their efficiencies for turbidity and organic load (COD-Mn) removal. Five types of flocculants based on starch and acrylamide were tested during the classic treatment flow coagulation-flocculation-settling with aluminum sulfate as coagulant (1-10 mg Al/L) and 0.5-10 mL/L flocculant dose (0.2% active substance). Better removal efficiencies of turbidity and organic load (COD-Mn) in case of flocculants based on starch and acrylamide copolymers: over 99% for turbidity and ~90% for COD-Mn in case of 300-400 NTU initial surface water turbidity were registered.

scholarly journals Use of Aloe vera as an Organic Coagulant for Improving Drinking Water Quality

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2024
Author(s):  
Abderrezzaq Benalia ◽  
Kerroum Derbal ◽  
Amel Khalfaoui ◽  
Raouf Bouchareb ◽  
Antonio Panico ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Suspended Solids ◽  
Aluminum Sulfate ◽  
Aloe Vera ◽  
Drinking Water Treatment ◽  
Water Turbidity ◽  
Turbidity Removal ◽  
Maximum Turbidity ◽  
Optimal Ph

The coagulation–flocculation–sedimentation process is widely used for removal of suspended solids and water turbidity reduction. The most common coagulants used to conduct this process are aluminum sulfate and ferric sulfate. In this paper, the use of Aloe vera as a natural-based coagulant for drinking water treatment was tested. The bio-coagulant was used in two different forms: powder as well as liquid; the latter was extracted with distilled water used as a solvent. The obtained results showed that the use of the natural coagulant (Aloe vera) in both powder (AV-Powder) and liquid (AV-H2O) forms reduced the water turbidity at natural pH by 28.23% and 87.84%, respectively. Moreover, it was found that the use of the two previous forms of bio-coagulant for drinking water treatment had no significant influence on the following three parameters: pH, alkalinity, and hardness. The study of the effect of pH on the process performance using Aloe vera as a bio-coagulant demonstrated that the maximum turbidity removal efficiency accounted for 53.53% and 88.23% using AV-Powder and AV-H2O, respectively, at optimal pH 6.

Use of a stable carbon isotope to assess the efficiency of a drinking water treatment method with CO2

2012 ◽  
Vol 65 (6) ◽  
pp. 983-988 ◽  
Author(s):  
M. Poberžnik ◽  
A. Leis ◽  
A. Lobnik
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Dissolved Inorganic Carbon ◽  
Tap Water ◽  
Stable Carbon Isotope ◽  
Research Work ◽  
Drinking Water Treatment ◽  
Treatment Method ◽  
Water Supply Systems ◽  
Co2 Gas

CO2 gas with a special isotopic signature (δ13C = −35.2‰ vs. VPDB) was used as a marker to evaluate the efficiency of a drinking water treatment method and the effect of an ultrasonic (US) stirrer. This treatment was developed to prevent precipitation and corrosion effects in water–supply systems. The research work was performed using a laboratory-scale pilot plant that was filled with tap water. The stable isotope analyses of δ13C-DIC (Dissolved Inorganic Carbon) in the water samples indicated that the maximum content of added CO2 gas in DIC was in the range of 35 to 45%. The use of the US stirrer during the entire experiment decreased the method's overall efficiency by 10%, due to degassing at a late stage of the experiment but accelerated the dissolution process in the early experimental stage.

Performance of conventional drinking water treatment following dispersant remediation of an oil spill in surface water

2021 ◽  
pp. 149583
Author(s):  
Oluchi Okoro ◽  
Isabelle Papineau ◽  
Morgan Solliec ◽  
Louis Fradette ◽  
Benoit Barbeau
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Surface Water ◽  
Oil Spill ◽  
Drinking Water Treatment

scholarly journals First Derivative UV Spectra of Surface Water as a Monitor of Chlorination in Drinking Water Treatment

2001 ◽  
Vol 1 ◽  
pp. 39-43 ◽  
Author(s):  
V. Zitko
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Surface Water ◽  
Distribution System ◽  
Drinking Water Treatment ◽  
Uv Spectra ◽  
Free Chlorine ◽  
Residual Chlorine ◽  
First Derivative ◽  
Derivative Spectra

Many countries require the presence of free chlorine at about 0.1 mg/l in their drinking water supplies. For various reasons, such as cast-iron pipes or long residence times in the distribution system, free chlorine may decrease below detection limits. In such cases it is important to know whether or not the water was chlorinated or if nonchlorinated water entered the system by accident. Changes in UV spectra of natural organic matter in lakewater were used to assess qualitatively the degree of chlorination in the treatment to produce drinking water. The changes were more obvious in the first derivative spectra. In lakewater, the derivative spectra have a maximum at about 280 nm. This maximum shifts to longer wavelengths by up to 10 nm, decreases, and eventually disappears with an increasing dose of chlorine. The water treatment system was monitored by this technique for over 1 year and changes in the UV spectra of water samples were compared with experimental samples treated with known amounts of chlorine. The changes of the UV spectra with the concentration of added chlorine are presented. On several occasions, water, which received very little or no chlorination, may have entered the drinking water system. The results show that first derivative spectra are potentially a tool to determine, in the absence of residual chlorine, whether or not surface water was chlorinated during the treatment to produce potable water.

Endotoxin contamination and control in surface water sources and a drinking water treatment plant in Beijing, China

2013 ◽  
Vol 47 (11) ◽  
pp. 3591-3599 ◽  
Author(s):  
Zhang Can ◽  
Liu Wenjun ◽  
Sun Wen ◽  
Zhang Minglu ◽  
Qian Lingjia ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Surface Water ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Water Sources ◽  
Endotoxin Contamination ◽  
And Control ◽  
Beijing China

scholarly journals Genotoxicity of source, treated and distributed water from four drinking water treatment plants supplied by surface water in Sardinia, Italy

2020 ◽  
Vol 185 ◽  
pp. 109385 ◽  
Author(s):  
Donatella Feretti ◽  
Mattia Acito ◽  
Marco Dettori ◽  
Elisabetta Ceretti ◽  
Cristina Fatigoni ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Surface Water ◽  
Drinking Water Treatment ◽  
Water Treatment Plants

scholarly journals UTILIZATION OF DRINKING WATER TREATMENT SLUDGE TO PRODUCE ALUMINUM SULFATE

2016 ◽  
Vol 33 (1) ◽  
pp. 87-104
Author(s):  
Abd EL- Razek, T. M ◽  
Elgendy, A. S ◽  
Fouad, M. M
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Aluminum Sulfate ◽  
Drinking Water Treatment ◽  
Water Treatment Sludge
Sign in / Sign up

Export Citation Format

Share Document