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Aluminum salt type microbial composite flocculant for treating shale gas drilling wastewater

A composite flocculant and drilling wastewater technology, which is applied in water/sewage treatment, mining wastewater treatment, water/sludge/sewage treatment, etc. It can solve the problems of bridging and network repair ability to be improved, so as to improve the coagulation effect , multi-adsorption potential, increase the effect of electric neutralization ability

Active Publication Date: 2019-12-27
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to research, the effect of inorganic-organic composite coagulants on different wastewater treatment is higher than that of single-use polymer inorganic coagulants or organic coagulants. Its coagulation advantages mainly include improved electrical neutralization ability and increased specific surface area. , but from the analysis of the microstructure, it can be seen that its bridging and network compensation capabilities still need to be improved

Method used

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  • Aluminum salt type microbial composite flocculant for treating shale gas drilling wastewater
  • Aluminum salt type microbial composite flocculant for treating shale gas drilling wastewater
  • Aluminum salt type microbial composite flocculant for treating shale gas drilling wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare industrial-grade aluminum sulfate with a content of 90% aluminum sulfate into a solution with a mass fraction of 20%, filter it, remove impurities, place it in a reactor and heat it to a temperature of 75°C, and then add PDMDAAC with a molecular weight of 2 to 3 million. Among them, aluminum sulfate solution and Al are used in the mixed solution 2 o 3 The mass ratio of meter to PDMDAAC is 30:1, adjust the stirrer to stir at medium speed for 90min, then add the mycobacterial polysaccharide F1 prepared in step S1, the dosage is 0.8% according to the mass ratio, adjust the stirrer to medium speed After stirring for 25 minutes, the prepared solution was dried in an oven at 50°C to obtain Class A aluminum salt microbial composite flocculant, where the aluminum salt microbial composite flocculant is abbreviated as F1-PDM / PAS.

[0031] Wherein F1 is the abbreviation of mycobacterial polysaccharide, so mycobacterial polysaccharide F1 is generally called mycobacterial p...

Embodiment 2

[0033] Prepare industrial-grade aluminum sulfate with a content of 90% aluminum sulfate into a solution with a mass fraction of 20%, filter it, remove impurities, put it in a reactor and heat it to a temperature of 80°C, and then add PDMDAAC with a molecular weight of 2 to 3 million. Among them, aluminum sulfate solution and Al are used in the mixed solution 2 o 3 The mass ratio of meter to PDMDAAC is 30:1, adjust the stirrer to stir at medium speed for 100min, then add the mycobacterial polysaccharide F1 prepared in step S1, the dosage is 1% according to the mass ratio, adjust the stirrer to medium speed After stirring for 25 minutes, the prepared solution was dried in an oven at a temperature of 50° C. to obtain Type B F1-PDM / PAS.

Embodiment 3

[0035] Prepare industrial-grade aluminum sulfate with an aluminum sulfate content of 90% into a solution with a mass fraction of 20%, filter it, remove impurities, place it in a reactor and heat it to a temperature of 85°C, and then add PDMDAAC with a molecular weight of 2 to 3 million. Among them, aluminum sulfate solution and Al are used in the mixed solution 2 o 3 The mass ratio of meter to PDMDAAC is 35:1, adjust the stirrer to stir at medium speed for 100min, then add the mycobacterial polysaccharide F1 prepared in step S1, the dosage is 1.2% according to the mass ratio, adjust the stirrer to medium speed After stirring for 25 minutes, the prepared solution was dried in an oven at a temperature of 50° C. to obtain Type C F1-PDM / PAS.

[0036] Comparison of the same F1-PDM / PAS coagulation test:

[0037] Put 500 mL of drilling wastewater into six 1 L mixing cups to be tested for coagulation, and set the program at 280r.min -1 Stir for 1min, 800 r.min -1 Stir for 5 min. Ad...

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Abstract

The invention discloses an aluminum salt type microbial composite flocculant for treating shale gas drilling wastewater, and belongs to the field of environmental wastewater treatment. A preparation process of the composite flocculant comprises the following specific steps: adding PDMDAAC (dimethyl diallyl ammonium chloride homopolymer) into an aluminum sulfate solution according to a mass ratio of (30:1)-(35:1) to obtain a PAS-PDM solution; then adding polysaccharide extracted from mycobacteria into the mixed solution, with the dosage being 1%; and stirring the mixture to obtain the stable aluminum salt microbial composite flocculant. In the wastewater treatment process, the coagulation effect of the prepared aluminum salt microbial flocculant is better than that of a conventional coagulant under the condition that the addition amounts are similar, and the COD removal rate of the aluminum salt microbial flocculant is increased by 24.10%-12.60%; and the chroma removal rate is increasedby 50%-10%.

Description

technical field [0001] The invention belongs to the field of environmental wastewater treatment, in particular to an aluminum salt microbial composite flocculant used for treating shale gas drilling wastewater. Background technique [0002] New and high-efficiency water treatment chemicals are the pillar industry of key development in the field of water treatment and environmental protection industry technology, and also the basic industry for the innovation and development of water industry, water pollution control engineering technology and equipment. Difficult to meet complex wastewater treatment requirements, such as: inorganic polymer coagulant has strong applicability to water treatment with complex components, has the advantages of high positive charge density and low cost, but the flocs formed are small and the dosage is large. A large amount of sludge is generated. Generally, organic polymer flocculants have hydrophilic groups such as -COO-, -NH-, -OH, etc., and ha...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F103/10
CPCC02F1/5263C02F2103/10
Inventor 朱天菊任宏洋陈丹丹李蕊王伟
Owner SOUTHWEST PETROLEUM UNIV
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