CN-119080359-B - Petroleum sludge terminal treatment method

Abstract

The invention discloses a petroleum sludge terminal treatment method, and relates to the technical field of petroleum sludge treatment. The method comprises the following steps of S1, oil sludge deoiling pretreatment, S2, oil washing sewage electrochemical treatment, namely, decomposing organic matters in the oil-containing sewage generated in the S1 treatment process through an electrolysis process by taking Fe 3 O 4 and Fe-C, al-Fe nano materials as catalysts, and S3, deoiling sludge solidification/stabilization treatment, wherein 6% -12% of sodium gluconate, trisodium citrate or L-arginine is used for deoiling pretreatment of the oil sludge. The invention firstly washes petroleum sludge by chemical agent, after liquid-solid separation, the liquid is degraded by electrochemistry, the separated solid sludge is solidified by magnesium oxychloride cement to form products such as road bricks, in the process, solid waste gangue and fly ash are used as doping materials, water glass solution is used for replacing water, and magnesium oxychloride cement with quick solidification and good air hardness is used as a curing agent, thereby realizing green treatment of petroleum sludge.

Inventors

• LIANG JILING
• ZHENG XIANJIN
• WANG LU
• JIANG SONG
• Zhong Guangdi
• WANG SHUO

Assignees

• 辽宁石油化工大学

Dates

Publication Date

20260508

Application Date

20240830

Claims (2)

1. 1. The petroleum sludge terminal disposal method is characterized by comprising the following steps: S1, deoiling pretreatment of petroleum sludge, namely deoiling pretreatment of petroleum sludge by using sodium gluconate, trisodium citrate or L-arginine with the mass concentration of 6% -12%; S2, carrying out electrochemical treatment on the oil-washing sewage, namely decomposing organic matters in the oil-containing sewage generated in the S1 treatment process by using Fe 3 O 4 and Fe-C, al-Fe nano materials as catalysts through an electrolysis process; s3, solidification/stabilization treatment of deoiling sludge: S3-1, mixing magnesium oxychloride cement with a water glass solution with a preset amount, fully dissolving, and sequentially adding fly ash, coal gangue and oil sludge to fully and uniformly mix the mixture to obtain cement paste, wherein the magnesium oxychloride cement consists of magnesium chloride and light magnesium oxide, and the water glass solution contains water glass with the mass concentration of 5% and has the liquid-solid ratio of 0.5; S3-2, vibrating the obtained cement paste on a vibrating table for 10min to remove bubbles, then injecting the cement paste into a die, curing for 24h at room temperature, demolding, and curing for 28 days at room temperature in a humid environment.
2. 2. The petroleum sludge terminal treatment method according to claim 1, wherein in the step S3, the material mass ratio is fly ash, coal gangue, petroleum sludge, light magnesium oxide, magnesium chloride=1:3:6:6.79:3.21.

Description

Petroleum sludge terminal treatment method Technical Field The invention relates to the technical field of petroleum sludge treatment, in particular to a petroleum sludge terminal treatment method. Background Oily sludge is produced primarily during the production, refining, storage and transportation of petroleum, including mud, crude oil, emulsified solids produced during refining, and some precipitates. The oil sludge has complex components, removes water and crude oil, and often contains worm eggs, bacteria, oil, chemical additives and the like, so that the oil sludge has potential harm to the environment, public health, safety and an ecological system. The research and treatment concept of the petroleum sludge treatment method is generally followed by the research scholars at home and abroad to reduce, harmless and recycle. Wherein, the reduction treatment focuses on reducing oily sludge generated by a source, and the harmless and recycling treatment focuses on high-efficiency treatment and utilization of the oily sludge. The current concept of sustainable development is of vital importance, and harmless and recycling treatment of oil-containing sludge has become a major research hotspot for the purposes of protecting the environment and recovering petroleum resources. There are various treatment methods of the sludge, such as chemical cleaning, solvent extraction, centrifugal separation, flotation and electroflotation, pyrolysis, ultrasonic treatment, supercritical treatment, microwave irradiation, biological treatment techniques, and combination treatment methods. The traditional landfill, composting, incineration and other treatment methods are not suitable for the requirements of green and sustainable development, and development of more environment-friendly and resource-friendly/harmless treatment and disposal technologies is urgently needed. The landfill method occupies a large area of land, the generated percolate has potential threat to groundwater, the incineration method is thorough in sludge treatment, high in energy consumption, large in initial investment and high in operation cost and can cause secondary pollution, and the composting treatment method can treat municipal sludge to a certain extent, but the composted products are unknown in destination, small in treatment amount and long in period. The heat treatment technology decomposes the oily sludge at high temperature, can effectively reduce the volume and recover valuable components. Compared with other treatment technologies, the heat treatment method has short treatment period, small occupied area and best volume reduction effect of 80-90%. However, the heat treatment technology has high running cost, may cause secondary pollution, and the like. The advantage of the bioreactor for treating the oily sludge is that the treatment period is short and the occupied area is small. However, the treatment cost is high, the treatment effect is relatively poor, and further secondary treatments such as centrifugal dehydration or heating and drying are required. The curing/stabilizing technology is one of the important means for treating solid waste at present, and inorganic curing agents such as cement, water glass, fly ash, clay and magnesium oxychloride cement, or organic curing agents such as urea-formaldehyde resin, polyester, ethylene oxide and acrylamide gel, or composite curing agents are used for cementing the solid with sludge, curing and forming the solid waste and enabling the solid waste to have certain strength, so that the solid waste is converted into building materials such as road bricks. In the solidification process, the release of harmful components in the sludge is limited by the physical and chemical action of the cementing material, so that the pollutants are converted into substances with low solubility, low mobility and low toxicity, and the erosion of the pollutants in the sludge to the ecological environment is reduced, thereby reducing the influence and harm of the pollutants to the environment. The method is simple to operate, low in cost and high in efficiency. At present, cement, quicklime, fly ash, ferrous sulfate and the like are commonly adopted as curing agents of municipal water plant sludge in a sludge curing and stabilizing process by an environment-friendly enterprise, and a series of chemical and physical reactions are carried out on the curing agents and the water in the sludge, so that a product has certain mechanical properties, the water content is reduced, and the standard of landfill or construction soil is achieved. However, the sludge reaches the water content standard of landfill or the use standard of landfill covering soil, a large amount of industrial products such as cement, lime and the like are required to be added, so that resource waste is caused, the cement productivity is promoted, and a large amount of dust and carbon dioxide are discharged in the production process of the cement. We