Oily Sludge

Different Treatment Methods for Oily Sludge & Drilling Waste Mud

1. Industry background:

Along with the economic development, the demand of oil gas increases year by year. The state increases the development efforts on land and sea oil gas, at the same time, the extensive mining also brings serious environmental pollution, so that the resource development and environmental protection lose balance. In the development process, the oil-based mud, hydraulic fracturing and other developments methods will cause high pollution.

Solid hazards:

The oil sludge is bulky, if directly discharged without processing, it will not only take up a lot of arable land, but also pollute the surrounding soil, water and air; if stored in the open air, it will directly pollute the land, and the crude oil will cause devastating pollution to the surrounding vegetation.

Oily Sludge
Oily Sludge

Gaseous hazards:

The oil sludge will be associated with formation of malodorous gases, and will pollute the surrounding soil, water and air; in case of fire, the sludge stored in the open air will be burning and accompanied by sulfur and other toxic gases, which will bring serious pollution to the air, but also cause a great threat to the health of the surrounding residents.

Other hazards:

The oil sludge contains a large number of pathogens, parasites (eggs), copper, zinc, chromium, mercury and other heavy metals, salts and polychlorinated biphenyls, dioxins, radionuclides and other toxic and hazardous substances that are difficult to degrade, which will cause great pollution and damage to the surrounding environment.

2. The conventional approaches and their drawbacks:

* Simple treatment

The oil sludge is directly buried in landfills or buried after cured, both of which have the characteristics of simple and easy operation. The direct landfill of oily sludge is the main method of oil sludge treatment.

Drawbacks: this method not only wastes the valuable energy in the oil sludge, but also may lead to environmental pollution. Among them, the method of landfill after curing can reduce the environmental hazards, but can’t meet the current environmental requirements.

oil sludge treatment plant
Oil sludge treatment plant

* Extraction method

The extraction method makes use of “like dissolves like” principle. Select a suitable organic solvent as extractant, and then recover the crude oil in the oil sludge. The use of multi-stage separation and extraction along with hot wash method to dispose oil sludge, the processed sludge can achieve the discharge standards of agricultural sludge, and the chemicals can be recycled.

Drawbacks: the supercritical sluid extraction technology is in the development stage. At present, the extraction process of oil sludge is still in the experimental development stage, so the technology is not very mature; as the extractant is expensive, and there will be a certain loss in the production process, the cost of extraction is quite high. Therefore, it has not been actually applied in oil sludge treatment refinery.

* Incineration method

After pre-dehydration treatment, the oil sludge is sent to the incinerator for incineration, and the temperature is 800-850℃. After 30 minutes, the incineration can be completed. After incineration, the slag needs to be further processed.

Drawbacks: the incineration process will produce a secondary pollution and waste valuable resources. The incineration must be carried out in a specially established incinerator, which can eliminate the harmful organic matter in the oily sludge. If the comprehensive utilization of the combustion heat energy isn’t taken into account, it will cause the waste of energy.

* Biological method

The biological treatment techniques of oily sludge are mainly cultivating, composting and sludge bioreactor. It mainly makes use of microorganisms and makes petroleum hydrocarbons in the oil sludge degraded into harmless soil composition.

Drawbacks: cultivating and composting methods require large area of land; the bioreactor method has waste residue discharged, and it has long processing time and complicated operation.

sewage sludge pyrolysis plant
Sewage sludge pyrolysis plant

* Physical and chemical treatment

The various types of physical and chemical methods are aimed at recovering crude oil. The high crude oil price and high sewage emission charges make this method have attractive prospects.

Drawbacks: firstly, the recycling is not thorough, and there exist secondary pollution problems of waste water and waste residue, which needs to be further considered or comprehensive utilized; secondly, it needs to add chemical agents in the process and specialized treatment facilities, which leads to complex process and high cost; thirdly, different sources of oily sludge have different properties, which limits the full applications and promotion of this method.

3. Introduction of Beston oil sludge pyrolysis equipment

The industrial continuous environmental-protection and energy-saving oil sludge pyrolysis equipment manufacture by Beston: the oil sludge is fed into pyrolysis reactor by screw feeder, and achieves the separation of water, oil gas, slag through different physical temperature sections. The oil gas in recycled by cooling equipment; and the waste emissions meet international standards.

Services of oil sludge pyrolysis treatment plant:

We supply drilling waste management services in the drilling process for the oilfield company, so that the oil produced in the drilling process achieves the removal standards and recycles.