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Method for determining chemical oxygen demand (COD) of titanium dioxide production waste water

A technology for chemical oxygen demand and waste water production, which is applied in the direction of analyzing materials through chemical reactions and material analysis through observing the impact on chemical indicators. It can solve the problems of slow COD detection and achieve accurate test values. The analysis process is fast and effective, and the operation is simple and easy

Inactive Publication Date: 2012-06-20
攀枝花鼎星钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a method for measuring the chemical oxygen demand (COD) of titanium dioxide production wastewater, which solves the slow problem of COD detection in titanium dioxide wastewater, and the COD value obtained is consistent with that measured in the prior art The values ​​are basically the same

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The selected wastewater is: a batch of discharged wastewater from Panzhihua Dingxing Titanium Co., Ltd. after neutralization treatment.

[0039] After neutralizing the waste water with lime, stir evenly, take 10ml, put it in a 250ml ground-mouth reflux conical flask, accurately add 10ml of potassium dichromate standard solution and more than 100 glass beads, slowly add 20ml of sulfuric acid-silver sulfate , adjust the voltage of the electric furnace to 200V, after boiling, reduce the voltage of the electric furnace to 100-150V to maintain slight boiling, and the reflow time is 5min, 10min, 15min, 30min, 2h respectively. Turn off the electric furnace, continue to reflux for 3 minutes, rinse the wall of the condenser tube with an appropriate amount of water, remove the Erlenmeyer flask, and dilute to about 140ml with distilled water. Add 3 drops of ferrous iron indicator and titrate with ferrous ammonium sulfate. The color of the solution changes from yellow to blue-green...

Embodiment 2

[0041] Select two batches (different from the time of the first batch) of discharged waste water after the neutralization treatment of Panzhihua Dingxing Titanium Industry Company, and the other steps are the same as in Example 1.

Embodiment 3

[0043] Three batches of neutralized wastewater discharged from Panzhihua Dingxing Titanium Co., Ltd. were selected, and the other steps were the same as in Example 1.

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Abstract

The invention relates to a method for determining chemical oxygen demand (COD) of titanium dioxide production waste water, which belongs to the field of titanium dioxide production and comprises the steps of A neutralizing titanium dioxide waste water through alkali; B determining the chemical oxygen demand of neutralized titanium dioxide waste water through a potassium dichromate method, wherein the reaction time for heating return flow is 10-30 minutes; C enabling the titanium dioxide waste water with unqualified chemical oxygen demand to repeat the step of A. By means of the method for determining a value of the COD, under the premise of an accurate test value, the operation is simple and easy to implement and the analysis process is fast and effective. Therefore, the method can be widely applied to the detection of the COD of the titanium dioxide waste water.

Description

technical field [0001] The invention belongs to the field of titanium dioxide production, and in particular relates to a method for measuring the chemical oxygen demand of titanium dioxide production wastewater. Background technique [0002] COD (Chemical Oxygen Demand) is chemical oxygen demand. Chemical oxygen demand is a chemical method to measure the amount of reducing substances that need to be oxidized in a water sample. It reflects the degree of water pollution by reducing substances. The higher the COD value, the heavier the organic pollution in water; the reducing substances in water are mainly various organic substances, and there are a small amount of nitrite, sulfide, ferrous salt, etc. [0003] The existing potassium dichromate method for measuring COD is commonly used in all waste water COD inspections, specifically: in acidic medium, potassium dichromate is used as an oxidant, silver sulfate is used as a catalyst, mercury sulfate is used as a masking agent for...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 杜长山吴桂兰郭靖瑜梁秀梅刘燕珍
Owner 攀枝花鼎星钛业有限公司
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