On-Line Toximeter STIPTOX

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ON-LINE TOXIMETER STIPTOX..

The Stiptox analysers provide three different toxicity analysers - the choice of which will depend on the need of the application. -

Stiptox-adapt (w)- immobilised adapted biomass suited for WWTP intake protection
Stiptox-adapt (b) - biomass fed from MLSS of treatment plant
Stiptox-norm - sensitive biomass for river monitoring / water intake protection

List of Articles : Toxicity Monitoring

STIPTOX-adapt (W)
STIPTOX-adapt (W) is a toxicity analyser with immobilized turbulent- bed biology. As in the BIOX-1010, the microbes grow on the inner surface of small hollow cylinders. Like the activated sludge of a treatment plant, the microbial population in the bioreactor is adapted to the conditions of the wastewater. So long as the wastewater is not toxic to the adapted biology, the organisms in the bioreactor take up dissolved oxygen. A toxic impact inhibits the respiration of the organisms, causing an increase in the dissolved oxygen level. If the respiration rate decreases by more than about 20%, an additional dilution of the wastewater is triggered, and is regulated such that the overall depression of microbial activity does not exceed 20%. This protects the microbes and provides the mechanism for toxicity measurement. The mixing ratio of wastewater and dilution water, together with the oxygen difference, are used to calculate the toxicity reading.
Features
True continuous measurement Response time: 3 to 15 minutes Measurement range: 0 - 100% toxicity Turbulent-bed bioreactor Sample preparation with self-cleaning coarse filter Automatic calibration Programmable concentration alarms Charts and instantaneous toxicity level displayed on LCD graphic display Up to 14 days historical data can be recalled and displayed graphically	STIPTOX-adapt(W) is configured for protecting treatment plant biology from toxic influent. Detector biology is immobilised in hollow cylinders. Changes in the sludge conditions in the aeration basin do not affect the toxicity measurement.
STIPTOX-adapt (B)
STIPTOX-adapt (B) is a continuous on-line toxicity analyser. The bioreactor is populated with microorganisms from the wastewater treatment process. For the analysis, wastewater is continuously mixed with activated sludge and dilution water. So long as the wastewater is not toxic to the adapted biology, the organisms in the bioreactor take up dissolved oxygen. A toxic impact inhibits the respiration of the organisms, causing an increase in the dissolved oxygen level. Increasing oxygen level is the measure for toxicity. For monitoring and control, STIPTOX- adapt (B) is equipped with signal outputs of 0-20 or 4-20 mA. A built-in graphical display shows concentration data and other important information, which are stored for the last 14 days. A diskette drive provides long-term data storage. For measuring toxicity in simulated tank conditions, the waste-water/activated sludge mixture is pumped directly from the aeration basin to the bioreactor. The oxygen level in the bioreactor is then proportional to that in the aeration basin.
Features
True continuous measurement Response time: 3 to 15 minutes Measurement range: 0 - 100% toxicity Turbulent-bed bioreactor Sample preparation with self-cleaning coarse filter Automatic calibration Programmable concentration alarms Charts and instantaneous toxicity level displayed on LCD graphic display Up to 14 days historical data can be recalled and displayed graphically STIPTOX-adapt (B) is designed for use with stable activated sludge and can handle frequent toxic slugs.
STIPTOX-norm
STIPTOX-norm is a toxicity analyser with immobilized normalised biology. The normalised microorganisms are cultured by addition of a nutrient solution and grow as with the BIOX-1010 on the inner surface of small hollow cylinders. The regulation is the same as in STIPTOX-adapt(W). The mixing ratio of wastewater and dilution water, together withthe oxygen difference, are used to calculate the toxicity reading. To specifically protect the nitrification process in a treatment plant, STIPTOX-norm can be set up with nitrification dominated detector biology. No dilution water is needed if there is sufficient oxygen content in the water being monitored.
Features
True continuous measurement Response time: 3 to 15 minutes Measurement range: 0 - 100% toxicity Normalized biology adjusted to nutrient solution Sample preparation with self-cleaning coarse filter Automatic calibration Programmable concentration alarms Charts and instantaneous toxicity level displayed on LCD graphic display Up to 14 days historical data can be recalled and displayed graphically STIPTOX-norm uses high sensitivity normalised biology which is immobilized in hollow cylinders. These microbes can be directly affected by the nutrient composition, enabling direct protection of processes such as nitrification.