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At least 919 records · Page 51Linked to original sources
PubMed1988

Water pressure and flow regulation for water-cooled lasers.

We experienced laser water valve failure resulting from poor water quality, frequent laser shutdowns from low water flow rates, and unnecessary service calls shortly after installing a new laser. The water valve failure resulted from deposits and corrosion. A dirt/rust water filter was installed, and no further water valve failure has occurred. A flow meter was added to the water system to adjust flow rates. It clearly shows when laser shutdowns are caused by low flow rates and indicates the need for water filter changes. Water pressure was monitored and is most affected by use of the laser. A convenient electric water control, activated by the laser key switch, has proved to be reliable. The water control is kept open by a timer ten minutes after the laser is shut off. We determined that our laser shutdowns were related to transient drops in water flow rates and possibly to draw off of water in other parts of the hospital.

Cold Temperature↗
PubMed1987

[The treatment of wastes from antibiotic manufacture by using pyrolusite].

Data on laboratory studies with real liquid sewage from antibiotic manufacture are presented. Two schemes are discussed: treatment of the sewage in an electrolysis plant followed by its afterpurification either in a column with pyrolusite or during a joint process of electrochemical purification with catalyst location on the plant bottom under the electrodes. The afterpurification of electrochemically treated liquid sewage on waste pyrolusite can provide and additional effect i.e. lower consumption of oxygen and decoloration at average by 15 and 25 per cent respectively.

Anti-Bacterial Agents↗
PubMed1987

[Sanitary microbiological aspects of the treatment of wastes from antibiotic manufacture in biological ponds].

Efficiency of decreasing sewage contamination was estimated under laboratory conditions by the Coli index in additional treatment of antibiotic production sewage in bioponds with higher aquatic plants. It was shown that the sewage decontamination in summer was intensive due to vital activity of complex biocenosis of the higher aquatic plants and algae and reached the required levels. This allowed to use much lower quantities of the reagents in chlorination of water for circulating water supply.

Anti-Bacterial Agents↗
PubMed1987

[Comparative evaluation of mathematical models of the process for the biological treatment of the wastes from antibiotic manufacture].

The main kinetic relationships of the process of biological oxidation of antibiotic production sewage were studied in laboratory models of mixer aerotanks. A relationship between the specific rates of BOD (biological oxygen demand) decreasing and BOD concentration in aerotanks was developed on the basis of the results relating to treatment of 8 types of the sewage within the ranges of the pure water BOD equal to 18-220 mg/l and the loads of 0.18-3.85 g BOD/g X day. To describe this relationship the following models were tested for their adequacy: Michaelis-Menten and Mozer models, a general model and a model of the first order reaction equation. The Mozer model with the relative root-mean-square deviation of 18.3 per cent proved to be the best in description of wide ranges of pure water BOD changing. The first order model with deviation of 12 per cent was the best in describing the process with low loads.

Anti-Bacterial Agents↗
PubMed1987

[Content of chemical elements in the liquid manure of swine at a treatment plant using biological purification].

An atom absorption spectrophotometer was used to study 13 chemical elements in samples taken at the entrance of the purification station, at the mechanical step exit, at the biostep exist, and at the laguna exit as well as following treatment of the solid fraction in open surface purification and drying plots. It was found that part of the biogenic chemical elements remained in the liquid fraction after purification and were hazardous in terms of eutrophication of the water receptacle. A technology was worked out to treat the solid fraction, however, it did not provide for preserving the biogenic chemical elements. This lowered the qualities of the fraction in enriching the soil.

Animals↗