Bottom mud conditioning and pollutant blocking and controlling coupling treatment method

A treatment method and pollutant technology, applied in water/sludge/sewage treatment, sludge treatment, sludge treatment, etc., can solve the problem of reducing the adsorption performance of zeolite powder to ammonia nitrogen, high cost of bottom sludge treatment, and difficulty in utilizing residual sludge and other problems, to avoid subsequent processing problems and waste of resources, low cost, and improve dehydration performance

Pending Publication Date: 2022-07-08
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this composite conditioner, inorganic flocculants and zeolite powder are added to the bottom mud to treat the bottom mud, so that the zeolite powder directly contacts with the organic matter in the bottom mud, and the organic matter blocks the pores of the zeolite powder, reducing the adsorption of the zeolite powder to ammonia nitrogen. performance; and the composite conditioner with complex components to treat the sediment will easily lead to the subsequent difficulty in using the residual sludge after treatment, resulting in waste of resources and difficulties in sludge disposal, and the cost of sludge treatment is high

Method used

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  • Bottom mud conditioning and pollutant blocking and controlling coupling treatment method
  • Bottom mud conditioning and pollutant blocking and controlling coupling treatment method
  • Bottom mud conditioning and pollutant blocking and controlling coupling treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Simple PAC conditioning experiment

[0040] Weigh 300g of sampled sediment samples and place them in six beakers respectively; then add 0mL, 2.4mL, 4.8mL, 7.2mL, 9.6mL, 12mL of PAC solution with a concentration of 50g / L into the six beakers, respectively. The ratio of PAC solid to sediment dry basis mass (TSS) was 0mg / g, 4mg / g, 8mg / g, 12mg / g, 16mg / g, 20mg / g; the six samples were stirred at a constant speed of 300r / min for 3min , and then stirred at a constant speed for 12 minutes at 100 r / min, and after settling for 30 minutes, the CST and residual ammonia nitrogen (NH) were measured respectively. 4 + -N) concentration, which results as figure 2 and image 3 shown.

[0041] Depend on figure 2 It can be seen that when the mass ratio of PAC solids to the dry base of the sediment is 12 mg / g, the dewatering performance of the sediment is optimized to reach a balance. Under the optimal dosage, that is, 15mg / g TSS, CST decreased by 81.5%, PAC promoted the electrical n...

Embodiment 2

[0044]Coupling conditioning experiment of PAC and unmodified zeolite powder

[0045] Weigh 300g of sampled sediment samples and place them in six beakers. First, add PAC to each beaker according to the optimal dosage (15mg / gTSS) in Example 1, and stir at a constant speed for 3min at 300r / min. , and then stir at a constant speed for 12min at 100r / min; then according to the mass ratio of zeolite powder and bottom mud dry base, 0.1g / g, 0.2g / g, 0.4g / g, 0.8g / g, 1g / g, 1.2 Add zeolite powder at g / g, stir at a constant speed for 10-15 minutes at 200 r / min, and measure the capillary water absorption time (CST) and residual water quality index (NH) after settling for 30 minutes. 4 + -N, COD). Another set of experiments was carried out in the order of adding zeolite powder first, followed by PAC, and the detection was performed after repeating the above steps. Figures 4 to 6 Both shows the comparison curves of conditioning experiment results when PAC and zeolite powder are added in d...

Embodiment 3

[0050] Coupling conditioning experiment of PAC and composite zeolite powder

[0051] In this example, the dosing order of "zeolite powder→PAC" was selected to study the conditioning effect of the modified zeolite powder. The specific experimental steps are as follows: Weigh PAC solid and zeolite powder and mix them uniformly to form composite zeolite powder, wherein the mass ratio of PAC solid and zeolite powder is 0mg / g, 1mg / g, 3mg / g, 5mg / g, 7mg / g and 9mg / g mixed to form composite zeolite powder with different mass ratios of PAC / zeolite powder.

[0052] Weigh 300g of sampling bottom mud samples and place them in six beakers respectively, and add the composite zeolite powder of different PAC / zeolite powder mass ratios into each beaker according to the optimum dosage (1g / gTSS) in Example 2, Stir at a constant speed for 10-15 minutes at 200 r / min; then add PAC to each beaker according to the optimal dosage (15 mg / g TSS) in Example 1, stir at a constant speed for 3 minutes at 3...

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Abstract

The invention provides a coupled treatment method for conditioning bottom mud and blocking and controlling pollutants. The coupled treatment method comprises the following steps: (1) putting bottom mud to be treated into a reaction container; (2) preparing a PAC solution; (3) preparing composite zeolite powder; (4) adding the PAC solution and the composite zeolite powder into the reaction container according to the mass ratio of the PAC solid to the bottom mud dry basis of 10-20mg / g and the mass ratio of the composite zeolite powder to the bottom mud dry basis of 0.8-1.2 g / g, stirring at a constant speed, and fully mixing; and (6) carrying out filter pressing after standing. According to the method, the dehydration performance of the bottom mud is improved, and nutrient substances such as ammonia nitrogen and organic matters released in the dehydration process of the bottom mud are adsorbed.

Description

technical field [0001] The invention relates to the field of sewage sludge treatment, in particular to a coupling treatment method for bottom sludge conditioning and pollutant resistance control. Background technique [0002] The acceleration of urbanization and industrial and agricultural development and the lack of people's awareness of environmental protection have led to the random discharge of pollutants. Pollution, environmental dredging is considered to be the most effective means to solve the problem of endogenous pollution. However, environmental dredging will inevitably generate a large amount of dredging sediment. [0003] The dredging sediment has complex composition, large amount, high moisture content, and is rich in organic matter, heavy metals, polycyclic aromatic hydrocarbons, and a large number of pathogenic bacteria, eggs and other toxic and harmful substances. If not properly disposed of, the release of pollutants will lead to secondary pollution. . De...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/143C02F11/122C02F101/16C02F101/30
CPCC02F11/00C02F11/143C02F11/122C02F2101/16C02F2101/30Y02W10/20
Inventor 张伟军吴金亮李岚峰
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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