Effect of benzylpenicillin sodium salt on the species composition of activated sludge biocenosis

Author(s):  
З.Е. Мащенко ◽  
В.В. Бахарев ◽  
Ю.А. Егорова ◽  
О.И. Нестеренко ◽  
Я.М. Русских

Видовой состав активного ила зависит от множества абиотических и биотических факторов. На сегодняшний день появилась проблема возникновения в сточных водах остатков фармацевтических препаратов, которые негативно влияют на организмы активного ила, осуществляющего биологическую очистку воды. Лекарственными средствами, вызывающими нарушения метаболизма активного ила и приводящими к снижению степени очистки воды, являются антибиотики. Эти вещества снижают выживаемость и размножение некоторых видов организмов, а также приводят к развитию резистентности у бактерий. Приведены результаты исследований по воздействию бензилпенициллина натриевой соли на гидробионты активного ила при однократном и многократном воздействии в течение 72 часов. Проведена оценка общих свойств ила – цвет, запах, возможность вспухания, седиментационные свойства. Для исследования биоценоза ила использовали метод «раздавленная капля» при увеличении ×1000. При анализе микроскопических препаратов учитывали количество гидробионтов активного ила и их общее состояние. В качестве индикаторных организмов использовали следующие виды: амебы голые Amoeba, раковинные Testacea, жгутиковые Flagellata, коловратки Rotaria, инфузории Vaginicola,Epistylis и Aspidisca, черви Nematoda и Oligоchaeta, тихоходки, нитчатые бактерии. Полученные данные свидетельствовали об удовлетворительной работе активного ила в условиях эксперимента. Однако при многократном добавлении бензилпенициллина натриевой соли возможно ухудшение процессов нитрификации. The species composition of activated sludge depends on many abiotic and biotic factors. To date, there is a problem of the presence of trace pharmaceuticals in wastewater that negatively affect the organisms of activated sludge performing biological water treatment. Antibiotics are drugs that cause disturbances in the metabolism of activated sludge and lead to a decrease in the level of water treatment. These substances inhibit the survival and reproduction of some types of organisms, and also result in the development of resistance in bacteria. The results of studies on the effect of benzylpenicillin sodium salt on hydrobionts of activated sludge with single and repeated exposure within 72 hours are presented. The general properties of the sludge – color, smell, bulking, sedimentation – were estimated. To study the sludge biocenosis, we used the «crushed drop» method with a magnification of ×1000. While analyzing the microscopic slides, the number of hydrobionts of activated sludge and their general condition were taken into account. The following species were used as indicator organisms: naked amoeba Amoeba, testate Testacea, flagellate Flagellata, rotifers Rotaria, infusoria Vaginicola, Epistylis and Aspidisca, worms Nematodaand Oligоchaeta, tardigrades, filamentous bacteria. The obtained data testified to the satisfactory operation of the activated sludge under the experimental conditions. However, with repeated addition of benzylpenicillin sodium salt, the nitrification processes may deteriorate.

1993 ◽  
Vol 28 (11-12) ◽  
pp. 473-480
Author(s):  
A. Heduit ◽  
B. Martin ◽  
I. Duchamp ◽  
D. R. Thevenot

Gold and platinum were compared to ascertain how they expressed a stabilized potential in activated sludge. The comparison was based on electrochemical determination of the electron transfer rate (i.e. equilibrium exchange current density) and recording of potentials against time. When both metals are treated in the same way, platinum gives equilibrium exchange current densities approx. 10 times higher than gold, both in aerated activated sludge and in treated water. For platinum, the equilibrium exchange current densities range from 0.1 to 0.25 µA/cm2 immediately after polishing and decrease during prolonged contact with activated sludge subjected to alternating aeration/anoxia sequences. The lower kinetics of electron transfer on gold go together with significant differences in response:- In an aerobic medium a gold electrode potential is lower than that of a platinum electrode. In a strongly anaerobic medium, the reverse is true. Consequently, the amplitude of the potential variation between aerobic and anaerobic media is smaller for gold than for platinum. Under our experimental conditions this amplitude was approx 350 mV for gold and 850 mV for platinum.- The slopes of the linear relationships between potential and pH or potential and the logarithm of the dissolved oxygen concentration are two or three times greater for platinum than for gold. Although the values obtained with platinum electrodes cannot represent a veritable equilibrium state, the platinum electrode zero-current potential would seem to be far more sensitive to variations in the medium than that of the gold electrode; it is, therefore, more suitable for use in activated sludge.


Author(s):  
Anjali Jayakumar ◽  
Christian Wurzer ◽  
Sylvia Soldatou ◽  
Christine Edwards ◽  
Linda A. Lawton ◽  
...  

2013 ◽  
Vol 421 ◽  
pp. 798-802
Author(s):  
Chao Xie

Activated sludge method is mainly used to sewage water treatment of water injection system in oil field, dissolved oxygen of sewage pond plays a important role in the sewage water treatment process. The proportional control algorithm of dissolved oxygen concentration is developed based on a first time delay model, and the parameter values of the controller is determined by using stability margins design approach. Simulation results are provided to illustrate the design procedure and the effectiveness of the proposed methods. When applying to the wastewater treatment system based on activated sludge, this method can achieve a satisfied treating performance with robustness. Simulation results are given to demonstrate the design procedure and the effectiveness of the proposed methods.


Sign in / Sign up

Export Citation Format

Share Document