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Textile dyeing sludge processing method for removing heavy metal and dehydrating

A technology for printing and dyeing sludge and heavy metals, applied in dehydration/drying/concentrated sludge treatment, water/sludge/sewage treatment, sludge treatment, etc., can solve problems such as heat and radiation, polluted waste gas, high cost, etc., to achieve The effect of less one-time investment, saving investment and low production cost

Inactive Publication Date: 2012-06-20
CHANGSHA JIEXIANG ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages are high cost and possible polluting exhaust, noise, vibration, heat and radiation

Method used

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  • Textile dyeing sludge processing method for removing heavy metal and dehydrating
  • Textile dyeing sludge processing method for removing heavy metal and dehydrating
  • Textile dyeing sludge processing method for removing heavy metal and dehydrating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The printing and dyeing sludge sample was taken from the wastewater treatment plant of a printing and dyeing enterprise in Lanxi, Zhejiang. The moisture content was 78.5% and the solid content was 21.5%. The treatment method includes the following steps:

[0026] (1) Pretreatment of printing and dyeing sludge: Put 5.0 Kg of printing and dyeing sludge into a beaker, then add 0.1L of industrial grade sulfuric acid to the beaker and stir for 30 minutes to form a solid-liquid mixture;

[0027] (2) Microwave heating: send the solid-liquid mixture obtained in step (1) into a microwave device to raise the temperature to 90°C and keep it for 60 minutes;

[0028] (3) Filtration: filter the solid-liquid mixture treated in step (2), and perform solid-liquid separation to obtain sludge residue and filtrate;

[0029] (4) Precipitating heavy metals: adjust the pH of the filtrate obtained in step (3) to 7.0 with sodium hydroxide solution, then add 20g of industrial grade sodium sulfide, stir f...

Embodiment 2

[0041] The printing and dyeing sludge sample was taken from the wastewater treatment plant of a printing and dyeing enterprise in Zhongshan, Guangdong, with a moisture content of 82.4% and a solid content of 17.6%. Three consecutive experimental treatments were carried out, and 2.0Kg of printing and dyeing sludge was taken in each experiment. The treatment steps are the same as in Example 1, the specific process parameters of each step are shown in Table 4, the wet weight and dry weight of the sludge obtained after treatment are shown in Table 5, and the heavy metal content before and after the printing and dyeing sludge treatment is shown in Table 6.

[0042]

[0043]

[0044] Table 6 Comparison of the average content of heavy metals before and after treatment obtained in three consecutive experiments

[0045] (Unit: mg / Kg)

[0046] ingredientCu Pb Zn Ni Hg CdCr As Average content before treatment819.57462.82512215.34.8518.21485.258.6 ...

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Abstract

The invention relates to a textile dyeing sludge processing method for removing heavy metal and dehydrating, which comprises the following steps: (1) adding industrial grade sulfate into textile dyeing sludge, mixing and reacting to form a solid-liquid mixture; (2) heating the solid-liquid mixture obtained in the step (1) to be 35-120 DEG C, and warming for 5-100 minutes; (3) filtering the solid-liquid mixture processed through the step (2) to obtain sludge slag and filtrate; (4) regulating the pH value of the filtrate obtained in the step (3) to be 7.0-9.5, adding industrial grade sodium sulfide medicament, stirring for 15-35 minutes, and filtering to obtain clear filtrate and filter residues containing the heavy metal; and (5) returning the clear filtrate obtained in the step (4) into a sewage processing system, and drying the filter residues for further processing. Since the method is used for carrying out heavy metal removal and dehydration on the textile dyeing sludge, the effect is good and the cost is low.

Description

Technical field [0001] The invention relates to a printing and dyeing sludge treatment method, in particular to a printing and dyeing sludge treatment method for removing heavy metals and dehydrating. Background technique [0002] With the rapid development of the printing and dyeing industry, although printing and dyeing enterprises have continuously improved their products, processing technology and printing and dyeing sludge treatment technology, due to the various PVA pastes, new additives and other organic substances that are difficult to biodegrade, the printing and dyeing wastewater , And finally enter a large amount of printing and dyeing sludge, which makes the treatment of printing and dyeing sludge more difficult. The sludge produced after printing and dyeing wastewater treatment is still difficult to dewater, and the moisture content of the sludge after dewatering reaches about 80%. The nature and composition of the printing and dyeing sludge are related to the raw f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12C02F9/04
Inventor 钟仁华袁兴中朱桂华彭诗阳刘丹
Owner CHANGSHA JIEXIANG ENVIRONMENTAL ENG
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