Method for neutralizing industrial wastewater by jump-type automatic feeding

An industrial wastewater and automatic feeding technology, applied in the direction of neutralization water/sewage treatment, etc., can solve the problems of substandard wastewater discharge, large waste, and difficulty in adjusting the amount of acid and alkali added in time, so as to save the cost of wastewater treatment materials. , the effect of control system stability

Inactive Publication Date: 2013-02-13
ANGANG STEEL CO LTD
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Problems solved by technology

However, the existing industrial wastewater treatment process does not take this chemical characteristic into consideration, and only proceeds according to the general acid-base neutralization titration method. This method is difficult to adjust the amount of acid-base addition in time, resulting in large consumption and waste of acid-base materials. , the cost is high, and because the original wastewater treatment system uses the PH value as the set value, the control system is unstable and cannot reach the dynamic control value of the PH value, so that the wastewater discharge cannot meet the standard and affect on-site production

Method used

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Examples

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specific Embodiment approach

[0019] The present invention will be described in detail below by way of examples.

[0020] Taking the wastewater from the cold rolling system and continuous annealing system of a cold rolling mill as an example, its pH value is between 1 and 4, it is acidic, the density is 0.1ml / L, and the wastewater volume is between 40 and 60 tons per hour. The neutralization water tank adopts two PH value analysis meters, and the average value of the two meters is taken as the PH value of this set of sudden-type automatic alkali addition control system, and the liquid level change of the alkali material tank is converted into the corresponding liquid alkali flow rate and waste water flow rate. The table value is used as the amount of waste water, and the feeding pump is adjusted to control the feeding amount. The density of the waste water is about 0.1ml / L, and the test range of the chemical titration jump range is between PH=5.30~8.70. After the jump range is determined, fine-tune it to f...

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Abstract

The invention discloses a method for neutralizing industrial wastewater by jump-type automatic feeding. The method comprises the following steps of: electronically measuring the PH value, namely, measuring the PH value according to hydrogen ion content and hydroxyl ion content; performing acid-base neutralization titration on the wastewater to be treated periodically to determine jump points; recording the jump points and a jump range of the PH value; deducing the relationship between the feeding amount and the wastewater flow; and feeding back the feeding amount which serves as a preset value of flow control to an automatic feeding control system. The method has the advantages that cost of materials for treating the wastewater is saved; the treated wastewater can reach an environment standard; the control system is stable; the normal production can be guaranteed; and an aim of environment protection is fulfilled.

Description

technical field [0001] The invention belongs to the technical field of measurement and control of industrial waste water treatment, in particular to a method for neutralizing industrial waste water by means of a jump-type automatic feeding used in the treatment of industrial waste water. Background technique [0002] The traditional liquid pH value analysis is to test the concentration data by titration. In fact, it is to calculate the acid-base amount for titration, calculate the acid-base content of the liquid under test according to the chemical reaction formula, and calculate the hydrogen ion and hydroxide ion through the acid-base content. content, and then take the logarithm of the ions and convert it into a pH value. The pH value ranges from 0 to 14, of which 0 to 7 is acidic and 7 to 14 is alkaline; the existing industrial wastewater treatment system uses acid and alkali The principle of neutralization is used to neutralize industrial wastewater. However, through th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66
Inventor 穆家臣
Owner ANGANG STEEL CO LTD
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