Method for treating oily sewage through solar STEP light-heat-electricity coupling

A solar energy and electrical coupling technology, applied in the direction of light water/sewage treatment, metallurgical wastewater treatment, water/sewage treatment, etc., can solve the problems of low industrialization, low efficiency and immaturity of oily sewage, etc., to improve utilization efficiency, excellent Conductivity, photocatalysis, and efficient oxidation effects

Active Publication Date: 2022-06-07
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few research results on solar energy utilization methods, which are relatively immature and have a low degree of industrialization. The efficiency of using solar energy to treat oily sewage in oil fields is still low

Method used

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  • Method for treating oily sewage through solar STEP light-heat-electricity coupling
  • Method for treating oily sewage through solar STEP light-heat-electricity coupling
  • Method for treating oily sewage through solar STEP light-heat-electricity coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] The initial concentration of oil in the oily sewage in the electrolysis cell is 500 mg / L. Before galvanostatic electrolysis, graphene oxide is added and reduced to the oily sewage and stirred and mixed for 30min to make the reaction system reach adsorption-desorption equilibrium; wherein, the oily sewage The concentration of reduced graphene oxide was 0.08 mg / mL.

[0095] The temperature of the electrolytic cell is raised to 70°C by using the thermal energy provided by the solar concentrator, and at the same time, the electric energy provided by the solar photovoltaic module is used to energize the electrolytic cell, and the current is 70 mA, and the electrolytic cell is illuminated. The sewage was electrolytically oxidized for 120 minutes. The electrolytic oxidation adopts a two-electrode system, the cathode is platinum electrode and the anode is TiO 2 Nanotube electrodes, the electrode area is 20 × 20mm, and the electrode spacing is 13mm.

[0096] After testing, it ...

Embodiment 2 to Embodiment 5

[0098] Examples 2 to 5 are basically the same as Example 1, except that the electrolysis time is 30min, 60min, 90min, and 150min, respectively.

[0099] Depend on image 3 and Figure 4 It can be seen that the oil content removal rate and the change rate of COD removal rate both increase with the increase of time. In the early stage of electrolysis, the degradable substances in the water are continuously oxidized on the photoelectrode, so the COD and oil content change rapidly. With the increase of time, all the degradable substances in the water are oxidized, leaving some substances that are not easily oxidized. As the oil content decreases, the reaction rate decreases. In addition, the reduced graphene is loose and porous, and has strong adsorption capacity. The oxygen-containing functional groups of its own structure can oxidize and decompose organic substances in water. The excellent photocatalytic performance synergizes with increased photocatalytic oxidation performanc...

Embodiment 6 to Embodiment 10

[0101] Examples 6 to 10 are basically the same as Example 1, except that the electrolysis temperatures are 20°C, 30°C, 50°C, 70°C, and 90°C, respectively.

[0102] Depend on Figure 5 and Image 6 It can be seen that when RGO is added to the system, the oil content removal rate and COD removal rate both increase significantly with the increase of temperature, indicating that RGO has an obvious enhancement effect on the photocatalytic oxidation degradation of oily wastewater. RGO has a strong adsorption effect in the solution. When the oil is still in the water phase, it has been oxidized or adsorbed, so the good effect of double reduction of chemical oxygen demand and oil content is achieved. Since the oxidative degradation of oily sewage is an endothermic reaction, the higher the temperature, the more favorable the positive reaction and the faster the reaction speed. Increasing the temperature increases the number of activated molecules, and the random movement of molecules...

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Abstract

The invention provides a method for treating oily sewage through solar STEP photo-thermal-electric coupling, which comprises the following steps of: providing heat energy by using a photo-thermal effect of solar energy, providing electric energy by using a photo-electric effect, and carrying out constant-current electrolysis on the oily sewage in an electrolytic tank with a cathode and an anode; wherein the temperature of the electrolytic tank ranges from 20 DEG C to 90 DEG C, and the current of the constant-current electrolysis ranges from 50 mA to 90 mA. According to the invention, solar energy is used as a green energy source, and under the synergistic effect of solar electrochemistry, photocatalysis and solar heat, on the basis of improving the utilization rate of solar energy, the reaction path of the oil-containing wastewater of the oil field is further optimized, the energy source is saved, and the degradation efficiency of the oil-containing wastewater of the oil field is greatly improved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for solar STEP light-thermal-electric coupling treatment of oily sewage. Background technique [0002] Oilfield sewage has a large amount, complex composition, refractory degradation and wide pollution range. Especially the large-scale application of tertiary oil recovery technology in oilfields has produced a large amount of high-emulsification, high-viscosity, and high-oil sewage, which aggravates the difficulty of oilfield sewage treatment. Oily sewage will pollute water sources, pollute rivers and lakes, pollute soil, endanger the ecological environment, and have adverse effects on humans, animals, plants and ecosystems. However, the traditional sewage treatment process can no longer meet the requirements of oilfield water treatment, reinjection or discharge. Research on efficient and clean oilfield sewage treatment technology has become a new direction for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/14C02F1/32C02F1/463C02F1/465C02F1/467C02F103/16
CPCC02F1/14C02F1/4672C02F1/463C02F1/465C02F1/325C02F2103/16C02F2201/461C02F2201/009Y02A20/212Y02W10/37
Inventor 苑丹丹吴红军王宝辉纪德强聂春红李鑫
Owner NORTHEAST GASOLINEEUM UNIV
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