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Method for coagulating coal-bed gas produced water

A treatment method and technology of produced water, applied in the field of water treatment, can solve problems such as the treatment and utilization technology of coalbed methane produced water, and achieve the goal of promoting harmless treatment and resource utilization, reducing treatment load and avoiding environmental pollution Effect

Inactive Publication Date: 2011-05-18
CHINA UNIV OF MINING & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, there is no established coalbed methane produced water treatment and utilization technology in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Inorganic coagulants and organic flocculants were selected from commercially available solid polyaluminum chloride (aluminum oxide content 29%) and 40% polydimethyldiallylammonium chloride aqueous solution;

[0023] a. Compounding of polyaluminum chloride and polydimethyldiallylammonium chloride: ① At 20°C, under the conditions of stirring speed of 200r / m and stirring time of 0.5h, 5kg of solid polychlorinated Aluminum chloride is dissolved to form 50kg of polyaluminum chloride aqueous solution; ② Directly use 100g of 40% polydimethyldiallylammonium chloride aqueous solution; ③ At 20°C, add ② solution to ① solution, and the Stir for 1.5 hours under the same conditions to prepare a stable compound coagulant, wherein the mass ratio of the organic flocculant to the alumina in the inorganic coagulant is about 1:15;

[0024] b. The produced water of coalbed methane flows out after initial settlement in the pretreatment tank, and a drug dissolving box is installed ...

Embodiment 2

[0029]Example 2: commercially available solid aluminum sulfate (alumina content 15.6%) and polyacrylamide were selected as the inorganic coagulant and the organic flocculant respectively;

[0030] a. The coalbed methane produced water flows out after the initial settlement of the pretreatment tank. Set up two dissolving boxes at the outlet of the pretreatment tank to stir and dissolve solid aluminum sulfate and polyacrylamide respectively. The diluted concentrations are 15% and 0.5% respectively ;

[0031] b. Dosing diluted polyaluminum chloride and polydimethyldiallyl ammonium chloride solution sequentially through a metering pump or a flow meter, the control dosage is 100mg / L and 2mg / L respectively, and the dosage interval is 1.2min;

[0032] c. After the coalbed methane produced water after dosing has stayed in the flocculation and sedimentation tank for 1 hour, the water quality analysis results are shown in Table 2, and the effluent can reach the discharge standard.

[...

Embodiment 3

[0036] Example 3: The inorganic coagulant is selected from self-made liquid polyaluminum chloride (aluminum oxide content 10%), and the organic coagulant is selected from the combination of polyacrylamide and 40% polydimethyldiallylammonium chloride aqueous solution (mass ratio 1:250), the coagulation aid is commercially available potassium permanganate;

[0037] a. Compounding of polyaluminum chloride, polyacrylamide, and polydimethyldiallyl ammonium chloride: ① directly use 50 kg of polyaluminum chloride liquid; Under the condition of stirring time of 1h, mix 1g of polyacrylamide and 250g of 40% polydimethyldiallylammonium chloride aqueous solution (mass ratio 1:250), and then, under the condition of ultrasonic frequency of 40kHz, accelerate Dissolve for 0.5h to form a 40% flocculant aqueous solution; ③At 25°C, add ②solution to ①solution and stir for 1h at a speed of 300r / m to obtain a stable compound coagulant agent, in which organic flocculation The mass ratio of aluminum...

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Abstract

The invention relates to a method for coagulating coal-bed gas produced water, which is realized in a way that: coal-bed gas produced water is coagulated by combining a chemical compounded from an inorganic coagulant and an organic flocculant with a coagulation assistant, or combining an inorganic coagulant, an organic flocculant and a coagulation assistant; a pretreatment pool is arranged at the outlet of the coal-bed gas produced water, a coagulation assistant dissolving box is arranged at the water inlet of the pretreatment pool, and the amount of the coagulation assistant is controlled by using a measuring pump or flowmeter; and the coal-bed gas produced water is firstly conditioned by the coagulation assistant, and then treated by the chemical compounded from the inorganic coagulant and the organic flocculant, or treated by combining the inorganic coagulant and organic flocculant. The amounts of the compounded or combined inorganic coagulant and organic flocculant are controlled by using the measuring pump or flowmeter, thereby effectively removing suspended matters in the coal-bed gas produced water, being beneficial to removing oil, multiple soluble ions, other organic substances and the like, reducing the consumption of chemicals and relieving the treatment load of the subsequent technique, so that the treated produced water can be discharged under the standard or can be conveniently recycled.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a coagulation treatment method suitable for coalbed methane produced water. Background technique [0002] Coalbed methane refers to the natural gas that occurs in coal seams, and its exploitation and utilization have been paid more and more attention. my country is a country that uses coal as its main energy source, and is rich in coal-bed methane resources. According to the National Coalbed Methane Resource Evaluation Report completed by China United Corporation in 2005, the geological resources of shallow coalbed methane buried below 2000m in my country are about 36 trillion cubic meters. Since coalbed methane mining at home and abroad is mostly carried out by drainage and pressure reduction, a large amount of coalbed methane produced water will be produced during the mining process. According to the stages of coalbed methane mining and water quality characteristics, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
Inventor 杨虹冯启言琚宜文吴建光
Owner CHINA UNIV OF MINING & TECH
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