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Synthesis of CTMP wastewater decolorization flocculating agent

A decolorization flocculant and a synthesis method technology are applied in the synthesis field of CTMP wastewater decolorization flocculant, which can solve the problems of deep color of wastewater, restriction of decolorization up to standard treatment, influence on the beauty of receiving water body, etc., achieve obvious decolorization effect, improve biochemical treatment effect, The effect of improving biochemical properties

Inactive Publication Date: 2009-05-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some studies have shown that after eucalyptus is pulped by CTMP technology, most of the phenols, alkali-soluble low-molecular-weight lignin, organic acids, sugars, etc. in the wood chips are dissolved in the waste liquid. Dissolved lignin is a color-forming substance, which makes the color of the wastewater very dark, which seriously affects the appearance of the receiving water body, affects the transmission of sunlight and hinders the growth and reproduction of aquatic organisms, and the decolorization of wastewater to meet the standard has become a constraint for the development of CTMP pulping technology. a major bottleneck

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The self-made CTMP wastewater is treated with the high-efficiency decolorizing flocculant of the present invention. The raw material ratio of CTMP is pine massoniana: Eucalyptus urophylla = 30:70, and the waste water is the mixed waste liquid of the pretreatment section and the refining section, and the appearance is sauce red. Chromaticity is 18700C.U, pH value is 12.44, COD Cr It is 14100mg / L.

[0021] CaCO 3 and Al 2 o 3 2g of each, mix well and place in a muffle furnace, calcined at 1200°C for 2 hours at high temperature, take 1g of the reaction product after cooling, add 15mL of hydrochloric acid solution, heat to boiling in a water bath, then add 0.6mL of iron salt solution, After reacting for 1 hour, take it out, cool and mature for 24 hours, take the supernatant to obtain a high-efficiency decolorizing flocculant.

[0022] Both calcium carbonate and aluminum oxide are commercially available analytical pure reagents, and the hydrochloric acid solution is pre...

Embodiment 2

[0028] The self-made CTMP (chemical thermomechanical pulp) wastewater is treated with the high-efficiency decolorizing flocculant of the present invention. The raw material of CTMP is 100% eucalyptus, and the waste water is the mixed waste liquid of the pretreatment section and the refining section, and the appearance is red in sauce. Chroma is 33000CU, pH is 12.60, COD Cr It is 21640mg / L.

[0029] CaCO 3 1.5g and Al 2 o 3 2g, mixed evenly and placed in a muffle furnace, calcined at 1150°C for 3 hours at high temperature, after cooling, take 1g of the reaction product, add 14mL of hydrochloric acid, heat to boiling in a water bath, then add 0.6mL of iron salt, and react for 1.5 hours After taking it out, after cooling and aging for 24 hours, the supernatant was taken to carry out the decolorization experiment of waste water.

[0030] Calcium carbonate and aluminum oxide are commercially available analytical pure reagents, and the hydrochloric acid solution is prepared f...

Embodiment 3

[0037] The self-made CTMP (chemical thermomechanical pulp) wastewater is treated with the high-efficiency decolorizing flocculant of the present invention. The CTMP raw material is 100% masson pine, and the waste water is the mixed waste liquid of the pretreatment section and the refining section, and the appearance is sauce red. Chroma is 25600CU, pH is 12.52, COD Cr It is 13820mg / L.

[0038] CaCO 3 2.0g and Al 2 o 3 1.0g, mixed evenly, placed in a muffle furnace, and calcined at 1000°C, 1100°C, 1200°C, and 1300°C for 2 hours at high temperature, respectively, after cooling, take 1g of the reaction product, add 18mL of hydrochloric acid, and heat in a water bath until Boil, then add 0.7mL of iron salt, take out after 2 hours of reaction, cool and mature for 24 hours, take the supernatant to carry out the decolorization experiment of wastewater. Take 100mL of CTMP wastewater, add 6.0mL of synthetic decolorizer, shake it on a shaker at 150r / min for 10min, let it stand for ...

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Abstract

The invention discloses a synthesis method for a CTMP wastewater decolorization flocculant. The method comprises the following steps: calcium carbonate and alumina are mixed evenly and have calcination reaction for 2 to 3 hours at a temperature of between 1,000 and 1,300 DEG C; then 14 to 18mL of hydrochloric acid solution is added to 1g of calcinate; 0.4 to 0.7 mL of ferric salt solution is added to 1g of calcinate; the ferric salt is an analytically pure FeCl3.6H2O reagent and is prepared into the aqueous solution with mass percent of between 55 and 65 percent; and after the reaction is carried out for 1 to 2 hours, the supernatant is taken so as to obtain the high-efficiency decolorization flocculant after more than 24 hours of cooling and curing. The high-efficiency CTMP wastewater decolorization flocculant is used for the treatment of CTMP wastewater. With the dosage of 6mL / 100mL wastewater, the CTMP wastewater decolorization flocculant can reduce the chromaticity of the wastewater from 18, 700 CU to below 80 CU which is stipulated by the national secondary standard for comprehensive sewage discharge. The decolorization effect is quite obvious.

Description

technical field [0001] The invention relates to a synthesis method of a high-efficiency decolorization flocculant for CTMP wastewater. The high-efficiency CTMP wastewater decolorization flocculant obtained in the invention is used for CTMP wastewater treatment. Under appropriate dosage conditions, the chromaticity of wastewater can be reduced from 18700CU to the national sewage comprehensive Below the 80CU stipulated in the secondary emission standard. Background technique [0002] Decolorization flocculation is the use of flocculants to flocculate the precipitation of color-forming substances in wastewater for decolorization. Its mechanism of action can be considered to rely on the neutralization of the charges on the particles or the bridging effect to cause the particles to settle. At present, there are two main categories of decolorizing flocculants used to treat industrial wastewater: the first category is inorganic coagulants, and inorganic coagulants include metal sal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 侯轶李友明郑振山曾娜
Owner SOUTH CHINA UNIV OF TECH