A Physico/Chemical System for Hygiene Waste Water Recovery

1993 ◽  
Author(s):  
N. M. Samsonov ◽  
N. S. Farafonov ◽  
L. H. Abramov ◽  
S. S. Bocharov ◽  
N. N. Protasov ◽  
...  
Keyword(s):  
Waste Water ◽  
Chemical System ◽  
Water Recovery ◽  
Physico Chemical

Occurrence and Removal of Cryptosporidium spp. Oocysts and Giardia spp. Cysts in Kenyan Waste Stabilisation Ponds

1993 ◽  
Vol 27 (3-4) ◽  
pp. 97-104 ◽  
Author(s):  
A. M. Grimason ◽  
H. V. Smith ◽  
W. N. Thitai ◽  
P. G. Smith ◽  
M. H. Jackson ◽  
...  
Keyword(s):  
Waste Water ◽  
Water Samples ◽  
Laboratory Experiments ◽  
Municipal Waste ◽  
Retention Period ◽  
Waste Stabilisation Ponds ◽  
Cryptosporidium Spp ◽  
Physico Chemical ◽  
Microbiological Parameters ◽  
Final Effluent

This study was designed to determine tlie occurrence and removal of Cryptosporidium spp. oocysts and Giardia spp. cysts, in municipal waste-water by waste stabilisation ponds in tlie Republic of Kenya. Eleven waste stabilisation pond systems located in towns across Kenya were included. A total of 66 waste-water samples were examined for the presence of oocysts and cysts, comprising 11 raw waste-water and 55 pond effluent samples over a two month period. Cryptosporidium spp. oocysts were detected in 6 and Giardia spp. cysts in 9 of the designated pond systems analysed demonstrating their ubiquitous nature throughout Kenya. Oocyst levels detected in raw waste-water samples ranged from 12.5 - 72.97 oocysts/l and various pond effluents between 2.25 - 50 oocysts/l. Cyst levels detected in raw waste-water samples ranged from 212.5 to 6212.5 cysts/l and in various pond effluents from 3.125 to 230.7 cysts/l. No Cryptosporidium spp. oocysts were detected in the final effluent from any pond systems studied (11/11). Whereas no Giardia spp. cysts were detected in the final effluent from 10 of 11 waste stabilisation pond systems studied, one pond system was found to be consistently discharging cysts in the final effluent at concentrations ranging from 40 to 50 cysts/l. The minimum retention period for the removal of Cryptosporidium spp. oocysts and Giardia spp. cysts was 37.3 days. Laboratory experiments were performed to assess physico-chemical and microbiological parameters to express relationships between pond performance and protozoa removal.

scholarly journals Bioremoval of chromium from wastewater of tannery factory in Iraq

2008 ◽  
Vol 5 (3) ◽  
pp. 399-405
Author(s):  
Baghdad Science Journal
Keyword(s):  
Waste Water ◽  
Contact Time ◽  
Chemical Process ◽  
Physiological State ◽  
Living Cells ◽  
Electrostatic Attraction ◽  
Optimum Conditions ◽  
Proteus Vulgaris ◽  
Insignificant Effect ◽  
Physico Chemical

Bioremoval of chromium from wastewater of tannery factory in Iraq was studied. The bacteria Proteus vulgaris 7E showed an enhanced capability in biosorping chromium when its concentration increased in the solution, reaching a maximum of 476,7 mg/ ml out of 492 mg/ ml under optimum conditions at pH 6 and 50°C at one hour contact time and biomass of 1 mg/ml. The present results showed that dead cells of P. vulgaris 7E biosorbed 87.41 mg/ml of chromium in comparison with91.18 mg/ml of chromium biosorbed by living cells, this indicates the insignificant effect of physiological state of cells. It was found that the above biosorption is physico-chemical process depends upon electrostatic attraction forces. The results has illustrated that the most efficient eluting solution was 0.1M HCL which recovered 85% of biosorbed chromium. P. vulgaris 7E was able to remove completely all chromium from the waste water taken from tannery factory.

Value Engineering-Based Method for Implementing the ISO14001 System in the Green Supply Chains

2019 ◽  
pp. 580-601
Author(s):  
Jun-Der Leu ◽  
Larry Jung-Hsing Lee ◽  
André Krischke
Keyword(s):  
Waste Water ◽  
Supply Chains ◽  
Co2 Emission ◽  
Value Engineering ◽  
Electronics Manufacturing ◽  
Water Recovery ◽  
Effect Analysis ◽  
A Value ◽  
Green Supply Chains ◽  
Quality Tools

Numerous green regulations currently require companies to be responsible for their effect on the natural environment, in addition to achieving their economic goals. In view of this, many companies have implemented the ISO14001 system in their supply chain to comply with green regulations. However, implementing such a system involves technical and communication efforts; hence, an effective method is needed to support the implementation. In this paper, the authors propose a value engineering (VE)-based model with quality tools to support the implementation of the ISO14001 system in the Green Supply Chains. In it, they applied the framework of VE with the quality engineering tools Fishbone Analysis and Failure Mode Effect Analysis for the qualitative and quantitative analysis of green issues in supply chains to cover quality, risk, and value of the system. The proposed method was applied to a global electronics manufacturing company in Taiwan, and the application results showed positive outputs in terms of CO2 emission, power consumption, water consumption, and waste water recovery. Based on the evidence, academic and industrial implications are discussed.

scholarly journals Cyclopentane hydrate-based processes for treating heavy metal containing wastewater

2019 ◽  
Vol 118 ◽  
pp. 04039
Author(s):  
Yamei Yang ◽  
Hang Zhou ◽  
Feng Li ◽  
Changrui Shi ◽  
Shuai Wang ◽  
...  
Keyword(s):  
Waste Water ◽  
Heavy Metal ◽  
Water Treatment ◽  
Enrichment Factor ◽  
Treatment Process ◽  
Waste Water Treatment ◽  
Water Recovery ◽  
Water Treatment Process ◽  
Metal Recycling

The scarcity of water and increasing water pollution are the pressing challenge human being facing. Recovering water and valuable heavy metals is highly desired for treating heavy metal containing wastewater. We proposed a novel hydrate-based process to treat Ni2+ containing wastewater. The water recovery, Ni2+ enrichment factor, desalination efficiency were studied using this cyclopentane hydrate-based method. A water recovery of 43% can be obtained with a desalination efficiency of round 88% and an enrichment factor of 1.6. The desalination efficiency and the quality of the as-made water via the hydrate-based process can be further improved to above 99% via three-stage hydrate reaction. The proposed hydrate-based water treatment process may find wide applications in waste water treatment and heavy metal recycling.

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