Raw and modified palygorskite in water treatment applications for low‐concentration ammonium removal

2021 ◽  
Author(s):  
Eleni Gianni ◽  
Christina Vasiliki Lazaratou ◽  
Georgios Panagopoulos ◽  
Panagiota Sarantari ◽  
Fotini Martsouka ◽  
...  
Keyword(s):  
Water Treatment ◽  
Low Concentration ◽  
Ammonium Removal ◽  
Modified Palygorskite

scholarly journals Phosphate and Ammonium Removal from Water through Electrochemical and Chemical Precipitation of Struvite

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 150
Author(s):  
Kyösti Rajaniemi ◽  
Tao Hu ◽  
Emma-Tuulia Nurmesniemi ◽  
Sari Tuomikoski ◽  
Ulla Lassi
Keyword(s):  
Energy Efficiency ◽  
Water Treatment ◽  
Chemical Precipitation ◽  
Phosphate Removal ◽  
Nutrient Recovery ◽  
Ammonium Removal ◽  
Synthetic Water

Batch electrocoagulation (BEC), continuous electrocoagulation (CEC), and chemical precipitation (CP) were compared in struvite (MgNH4PO4·6H2O) precipitation from synthetic and authentic water. In synthetic water treatment (SWT), struvite yield was in BEC 1.72, CEC 0.61, and CP 1.54 kg/m3. Corresponding values in authentic water treatment (AWT) were 2.55, 3.04, and 2.47 kg/m3. In SWT, 1 kg struvite costs in BEC, CEC, and CP were 0.55, 0.55, and 0.11 €, respectively, for AWT 0.35, 0.22 and 0.07 €. Phosphate removal in SWT was 93.6, 74.5, and 71.6% in BEC, CEC, and CP, respectively, the corresponding rates in AWT were 89.7, 77.8, and 74.4%. Ammonium removal for SWT in BEC, CEC, and CP were 79.4, 51.5, and 62.5%, respectively, rates in AWT 56.1, 64.1, and 60.9%. Efficiency in CEC and BEC are equal in nutrient recovery in SWT, although energy efficiency was better in CEC. CP is cheaper than BEC and CEC.

scholarly journals Effect of Intermittent Aeration in a Hybrid Vertical Anaerobic Biofilm Reactor (HyVAB) for Reject Water Treatment

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1151
Author(s):  
Vasan Sivalingam ◽  
Carlos Dinamarca ◽  
Eshetu Janka ◽  
Sergey Kukankov ◽  
Shuai Wang ◽  
...  
Keyword(s):  
Water Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Biofilm Reactor ◽  
Anaerobic Sludge ◽  
Main Process ◽  
Intermittent Aeration ◽  
High Concentration ◽  
Ammonium Removal ◽  
Reject Water

Water from anaerobic sludge dewatering (reject water that is recycled to the inlet main process treatment) from the Knarrdalstrand municipal wastewater treatment plant in Porsgrunn, Norway, contains 2.4 g/L of total chemical oxygen demand (TCOD) and 550 mg/L NH4-N (annual average). The high concentration of ammonium causes disturbances in the mainstream physical and chemical processes, while only a small fraction of the organics is biodegradable. A pilot-scale hybrid vertical anaerobic biofilm (HyVAB) reactor combining anaerobic and aerobic treatment was tested for reject water treatment to reduce process disturbances. The pilot HyVAB was prepared for the study with continuous aeration of the aerobic part of the reactor for 200 days, while two intermittent aeration schemes were applied during the three-month test period. Ammonium removal efficiency increased from 8% during the continuous aeration period to 50% at the end of the test when a short (7 min) aeration cycle was applied. COD removal was close to 20%, which was mainly obtained in the anaerobic stage and not significantly influenced by the aerations schemes. Simultaneous partial nitrification and denitrification were established in the biofilm that alternated between aerobic and anoxic conditions. The observed high ammonium removal is explained by two alternative shortcut processes via nitrite. The lack of biodegradable organics in the aerated stage suggests that most of the nitrogen removal was via the anammox pathway (autotrophic denitrification). The HyVAB, combining an anaerobic sludge bed and an intermittently aerated biofilm, appears to be an efficient process to treat high ammonium containing reject water.

Low concentration of zeolite to enhance microalgal growth and ammonium removal efficiency in a membrane photobioreactor

2020 ◽  
pp. 1-14
Author(s):  
Ran Tao ◽  
Robert Bair ◽  
Melanie Pickett ◽  
Jorge L. Calabria ◽  
Aino-Maija Lakaniemi ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Low Concentration ◽  
Ammonium Removal

Study of the Origin of Musty Taste in the Drinking Water Supply

1999 ◽  
Vol 40 (6) ◽  
pp. 171-177 ◽  
Author(s):  
A. Montiel ◽  
S. Rigal ◽  
B. Welté;
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Surface Water ◽  
Water Supply ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Drinking Water Supply ◽  
Low Concentration ◽  
Surface Water Treatment

During Autumn 1982, many consumers complained in Paris about a musty taste. Complaints were located only in a quarter of Paris which was supplied by a surface water treatment plant. The experiments and tests have shown that this taste appeared only in the network. Musty taste was detected neither on the river nor at the outlet of the plant. Some hypotheses have been made and experiments have been conducted later because this episode of complaints stopped suddenly. It appeared that some chlorophenols were produced in the plant. These compounds were biomethylated further by fungi in the network leading to chloroanisole which give a musty taste detectable a very low concentration.

Ammonium removal pathways and microbial community in GAC-sand dual media filter in drinking water treatment

2012 ◽  
Vol 24 (9) ◽  
pp. 1587-1593 ◽  
Author(s):  
Shuo Feng ◽  
Shuguang Xie ◽  
Xiaojian Zhang ◽  
Zhiyu Yang ◽  
Wei Ding ◽  
...  
Keyword(s):  
Drinking Water ◽  
Microbial Community ◽  
Water Treatment ◽  
Drinking Water Treatment ◽  
Ammonium Removal

scholarly journals Determining an Optimum Tree Species for the Phytoremediation of Cumene and 4-Cumylphenol in Groundwater

2014 ◽  
Vol 32 (4) ◽  
pp. 196-202 ◽  
Author(s):  
K.K. Fontenot ◽  
E.W. Bush ◽  
R.J. Portier ◽  
B.A. Meyer ◽  
J.S. Beasley ◽  
...  
Keyword(s):  
Water Treatment ◽  
Tree Species ◽  
Deionized Water ◽  
High Concentration ◽  
Eastern Redcedar ◽  
Low Concentration ◽  
Black Willow ◽  
Eastern Cottonwood ◽  
Bald Cypress ◽  
Water Oak

Cumene and 4-cumylphenol are the primary constituents of concern in a groundwater plume at a chemical facility located in Plaquemine, Louisiana. Phytoremediation, a method that uses plants to remove contaminants from water and soil, was posed as a solution to removing the constituents of concern and creating hydraulic control of the plume. Five tree species, eastern redcedar, bald cypress, black willow, eastern cottonwood, and water oak, were chosen as potential remediators. Eastern redcedar and water oak did not tolerate the saline, contaminated water. Bald cypress, black willow, and eastern cottonwood trees were irrigated with deionized water, deionized water containing 0.5 mg·L−1 (0.5 ppm) cumene and 1 mg·L−1 (1 ppm) 4-cumylphenol as the low concentration, or deionized water containing 1 mg·L−1 (1 ppm) cumene and 4 mg·L−1 (4 ppm) 4-cumylphenol referred to as the high concentration. Both bald cypress and black willow were the best tree species for remediation of the groundwater as they were able to sequester the constituents of concern in their lower root tissue. Mean concentration of 4-cumylphenol detected in bald cypress roots at the end of the study were 1.72 mg·kg−1 in the low concentration water treatment and 1.50 mg·kg−1 in the high concentration water treatment. Mean concentration of 4-cumylphenol detected in black willow roots at the end of the study were 16.58 mg·kg−1 in the low concentration water treatment and 25.65 mg·kg−1 in the high concentration water treatment. Bald cypress was ultimately chosen for full scale planting in the fall of 2008.

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