scholarly journals Experimental study on removal of toxic metals and nutrient salts from secondary treated wastewater using Echinochloa pyramidalis and Ludwigia stolonifera

2021 ◽  
Vol 24 (1) ◽  
pp. 15-25
Author(s):  
Amany Abo-El-Kassem ◽  
Alaa-Eldin Abd-Elaal ◽  
Ali Gad ◽  
Saber Said
Keyword(s):  
Experimental Study ◽  
Toxic Metals ◽  
Treated Wastewater

scholarly journals Assessment of the Quality of Liquid Digestate from Small-scale Anaerobic Biodigesters Used for Crop Irrigation in Urban and Peri-urban Maseru, Lesotho

2021 ◽  
pp. 30-46
Author(s):  
Emmanuel B. Tanor ◽  
Itumeleng Lejone ◽  
Sibusisiwe Magama ◽  
Mantopi Martina Lebofa
Keyword(s):  
Toxic Metals ◽  
Biogas Production ◽  
Low Cost ◽  
Ammonium Nitrogen ◽  
National Standards ◽  
Treated Wastewater ◽  
Small Scale ◽  
Liquid Digestate ◽  
Crop Irrigation

Objective: The aim of the study was to determine the quality of Liquid Digestate (LD) from selected small scale anaerobic digesters for biogas production and assess the suitability for crop irrigation. Methodology: The selection of the parameters was guided by national standards and international guidelines for the agricultural use of wastewater and wastewater treatment products. The analysis was carried out using standard methods. Results: The results showed that most of the parameters determined of the LD from the anaerobic reactors were within the ranges of the national standards and the FAO recommended guideline limits for crop irrigation with wastewater; pH (6.75-8.50), alkalinity 12.5-45.7 mg/L), EC 0.39-1.30dS/m), COD (82.3-158.0 mg.O2/L, SS (1.35-6.17 mg/L) and TDS (249.6-832.0 mg/L). The LD from the reactors contain some considerable amounts of plant nutrients; total nitrogen (11.5- 33.1 mg/L), ammonium nitrogen (2.3-22.0 mg/L), total phosphorous (1.5-121.6 mg/L) calcium (37.68-438 mg/L), magnesium (15.25-127-36 mg/L), sodium (4.67-32.47 mg/L), chloride (9.30-19.5 mg/L) and potassium (12.07-39.50 mg/L). The mean concentrations of the micronutrients cobalt (0.67-0.94 mg/L), copper (0.78-1.08 mg/L), iron (0.851.93 mg/L), manganese (0.09-0.20 mg/L), nickel (0.82-1.48 mg/L) and zinc (0.31-2.24 mg/L) were greater than the FAO guideline limits for wastewater used in crop irrigation, which suggests that the LD are potential low-cost biofertilizer. The level of toxic metals arsenic (0.65-0.87 mg/L), cadmium (0.70-0.97 mg/L), chromium (0.71-0.98 mg/L) and lead (0.55-1.46 mg/L), were higher than the recommended levels for use of treated wastewater in crop irrigation. The numbers of the common pathogenic microorganisms determined were much lower than the FAO and WHO recommended limits indicating that the liquid digestate will not pose any major health risk a biofertilizer. Conclusion: The nutrients and other parameters indicated that the quality of the LD is good enough to be used for crop irrigation without any restrictions.However, the LD should be used with caution, because of the levels of the toxic metals, which may accumulate in the soil after prolonged application. Also, extension services on best practices for the agricultural application of the LD should be made available to potential users to mitigate any potential negative environmental and health impacts.

scholarly journals Experimental study on accumulation of heavy metals in vegetables irrigated with treated wastewater

2019 ◽  
Vol 9 (5) ◽  
Author(s):  
Athar Hussain ◽  
Manjeeta Priyadarshi ◽  
Shashikant Dubey
Keyword(s):  
Heavy Metals ◽  
Experimental Study ◽  
Treated Wastewater

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

An Experimental Study of Some Properties of Stuttered Words

1962 ◽  
Vol 5 (4) ◽  
pp. 387-394 ◽  
Author(s):  
Bruce Quarrington ◽  
Jerome Conway ◽  
Nathan Siegel
Keyword(s):  
Experimental Study

Experimental study of total body washout employing extracorporeal circulation and hypothermia

1974 ◽  
Vol 126 (2) ◽  
pp. 243-248
Author(s):  
A WAKABAYASHI ◽  
T KUBO ◽  
K CHARNEY ◽  
Y NAKAMURA ◽  
J CONNOLLY
Keyword(s):  
Experimental Study ◽  
Extracorporeal Circulation ◽  
Total Body

Gastric Freezing: An Experimental Study

1963 ◽  
Vol 45 (3) ◽  
pp. 374-383 ◽  
Author(s):  
Donald C. McIlrath ◽  
George A. Hallenbeck ◽  
Hubert A. Allen ◽  
Charles V. Mann ◽  
Edward J. Baldes ◽  
...  
Keyword(s):  
Experimental Study

The Effect of Cortisone and Corticotropin on The Healing of Gastric Ulcer: An Experimental Study

1958 ◽  
Vol 34 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Henry D. Janowitz ◽  
Vernon A. Weinstein ◽  
Rhoda G. Shaer ◽  
James F. Cereghini ◽  
Franklin Hollander
Keyword(s):  
Experimental Study ◽  
Gastric Ulcer
Sign in / Sign up

Export Citation Format

Share Document