The Stereochemistry of Asymmetric Phosphorus Compounds. II. Stereospecificity in the Irreversible Inactivation of Cholinesterases by the Enantiomorphs of an Organophosphorus Inhibitor

1958 ◽  
Vol 80 (2) ◽  
pp. 456-458 ◽  
Author(s):  
Herbert S. Aaron ◽  
Harry O. Michel ◽  
Benjamin Witten ◽  
Jacob I. Miller
Keyword(s):  
Phosphorus Compounds ◽  
Organophosphorus Inhibitor

Solid, slightly soluble phosphorus compounds as nutrient source in activated sludge treatment of forest industry wastewaters

1997 ◽  
Vol 35 (2-3) ◽  
pp. 131-138 ◽  
Author(s):  
Pirjo-Riitta Rantala ◽  
Hannu Wirola
Keyword(s):  
Activated Sludge ◽  
The Other ◽  
Phosphorus Compounds ◽  
Forest Industry ◽  
Phosphorus Concentration ◽  
Nutrient Source ◽  
Sludge Treatment ◽  
Grain Sizes ◽  
Soluble Phosphorus ◽  
The Mean

The aim of the study was to determine if solid, slightly soluble compounds can be used as nutrient source in activated sludge treatment plants instead of liquid phosphoric acid. Four different solid materials were tested in lab-scale solubility tests to find compounds which are least soluble. Two materials were chosen for further studies: apatite and raw phosphate. The use of apatite and raw phosphate as nutrient source was studied in lab-scale activated sludge reactors along with a control reactor where phosphorus was added in liquid form. The phosphorus dosage, measured as elementary phosphorus, was the same for all three reactors. The reactors were fed with pre-clarified chemi-thermomechanical pulp mill (CTMP) wastewater. There were no significant differences in the reductions of organic matter between the three reactors. The mean effluent concentration of total phosphorus was 3 mg P/l in the control reactor and less than 1 mg P/1 in the other two reactors. The soluble phosphorus concentration was more than 2 mg P/l in the control reactor and less than 0.5 mg P/l in the other two. Apatite was an even better nutrient source than raw phosphate. Further lab-scale tests were conducted using two different grain sizes of apatite. No significant differences were found between the studied grain sizes (<0.074 mm and 0.074 mm-0.125 mm). Apatite was then used in full-scale at a CTMP-mill two different times. The experiments showed that the mean concentrations of phosphorus can be reduced radically by using apatite as a nutrient source instead of liquid phosphorus. Solid phosphorus compounds are a viable alternative to reduce the phosphorus load from forest industry wastewater treatment plants.

Catalytic synthesis of sulfur and phosphorus compounds via atom-economic reactions

2020 ◽  
Vol 30 (2) ◽  
pp. 129-138
Author(s):  
Shin-ichi Kawaguchi ◽  
Yuki Yamamoto ◽  
Akiya Ogawa
Keyword(s):  
Catalytic Synthesis ◽  
Phosphorus Compounds

scholarly journals Phosphorus Compounds in Animal Tissues

1958 ◽  
Vol 233 (4) ◽  
pp. 948-953 ◽  
Author(s):  
Walter C. Schneider ◽  
Jean Rotherham
Keyword(s):  
Phosphorus Compounds ◽  
Animal Tissues

scholarly journals Phosphorus Compounds in Animal Tissues

1963 ◽  
Vol 238 (11) ◽  
pp. 3565-3571 ◽  
Author(s):  
Walter C. Schneider ◽  
Ram M. Behki
Keyword(s):  
Phosphorus Compounds ◽  
Animal Tissues

scholarly journals Applying EFDC Explorer model in the Gallinas River, Mexico to estimate its assimilation capacity for water quality protection

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Claudia Villota-López ◽  
Clemente Rodríguez-Cuevas ◽  
Franklin Torres-Bejarano ◽  
Rodolfo Cisneros-Pérez ◽  
Rodolfo Cisneros-Almazán ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Industrial Wastewater ◽  
Socioeconomic Development ◽  
Inorganic Compounds ◽  
Organic Content ◽  
Phosphorus Compounds ◽  
Active Components ◽  
Nitrogenous Substances ◽  
Efficient Recovery ◽  
Assimilation Capacity

AbstractSanitary and industrial wastewater discharged into rivers, is a general problem that occurs in most of the world and Mexico is not the exception, the main goal of this research is to determine based on simulations of pollutants concentrations, the assimilation capacity of the Gallinas River against discharges of agricultural and industrial wastewater from the cultivation and processing of sugar cane under two different hypothetical simulation scenarios, based on reproducing two well know scenarios. In sugarcane cultivation, large quantities of fertilizers are used whose main active components are based on nitrogen or phosphorus compounds, therefore, the wastewater resulting from sugarcane processing contains a high organic content from 20 to 40% of inorganic compounds, such as nitrogenous substances, organic acids, and phosphorous sulfates. For this reason, the physical–chemical variables of interest analyzed in this work are the PO$$_4$$ 4 (phosphate), NO$$_3$$ 3 (nitrate), and DO (dissolved oxygen). With the simulation results according to each scenery, it can be determined, that despite the continuous discharge of polluting elements, the Gallinas River has a good assimilation capacity thanks to reaeration processes that permit efficient recovery of the dissolved oxygen in the water column. Gallinas River is located in the region known as the Huasteca Potosina, this investigation is relevant for the region due to the River is of vital importance being the main tributary that allows socioeconomic development activities in this zone. To carry out the simulations, was used the Explorer Modeling System 8.4 (EFCD) model and was performed two samplings campaign along 15 km in the water body to calibrate the numerical model to represent the dry and wet seasons during May and September respectively named as calibration scenarios.

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