Method for early warning and monitoring of toxicity of inflow water of sewage plant

Abstract

The invention discloses a method for early warning and monitoring of toxicity of inflow water of a sewage plant. The method comprises the steps as follows: active sludge in a biochemical pool is continuously collected and mixed with the inflow water proportionally for pre-aeration; the mixture is pumped into a completely mixed prewarning reactor; a dissolved oxygen electrode is adopted to monitor DO (dissolved oxygen) in real time; and data is acquired and analyzed by a PLC (programmable logic controller) system, and DOY% is calculated according to a formula that DOY % is a product obtained by multiplying 100 by a quotient obtained by dividing a difference of DO2 and DO1 by DO0, wherein DO0 represents the amount of oxygen consumed by a system, DO1 represents the dissolved oxygen amount before impact of toxicants, DO2 represents the dissolved oxygen amount after impact of the toxicants, and the DOY% and a preset inhibition ratio are compared, so that the inhibitive characteristic of the inflow water to the active sludge in the biochemical pool is evaluated. With the adoption of the method, the toxicity of the inflow water of the sewage plant can be monitored in real time, the toxicity condition of the active sludge in the sewage plant can be really reflected, further, the operation and the maintenance are simple, the cost is low, and accordingly, the method is applicable to online monitoring of the toxicity of the inflow water of the sewage plant.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to sewage containing industrial waste water, in particular to a monitoring method for on-line continuous monitoring of the toxicity of sewage plant influent. Background technique [0002] In the current water treatment technology, the activated sludge method is still widely used in large, medium and small sewage treatment plants due to its advantages of simple treatment process, low operating cost, and convenient maintenance. With the acceleration of my country's industrial development, the discharge of industrial wastewater is increasing year by year. It is more common for untreated industrial wastewater to be merged into urban domestic sewage and enter sewage treatment plants, which may contain a large amount of microbial toxic substances. Substances will inhibit the normal metabolic process of activated sludge microorganisms, resulting in unstable sewage treatment process, the qual...

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Problems solved by technology

There are few wastewater biotoxicity monitoring equipment developed on the basis of this principle, and the developed equipment has problems such as complex system, unstable continuous monitoring, high maintenance requirements, and systematic errors between dual dissolved oxygen electrode equipment.

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