Oily sludge recycling and treatment method

Abstract

The invention discloses an oily sludge recycling and treatment method. The oily sludge recycling and treatment method comprises the following steps: mixing oily sludge, water and an extracting agent in a mass ratio of 1:2:(0.3-0.7), wherein the extracting agent is a mixture containing a low-boiling-point organic solvent, a dispersing agent and an anionic surfactant; carrying out ultrasonic oscillation on the mixture in the step S1, and forming an oily sludge extracting agent mixed solution; carrying out solid-liquid centrifugal separation on the oily sludge extracting agent mixed solution, so that deoiled sludge and oil-water extracting agent mixed solution are obtained; and carrying out water separation and oil purification and recycling on the oil-water extracting agent mixed solution. The oily sludge recycling and treatment method provided by the invention is low in separation cost and high in efficiency and can realize extraction and recycling of petroleum in oily sludge, so that resources are utilized again.

Description

【Technical field】 [0001] The invention relates to the technical field of sludge treatment, in particular to a method for recovering and treating oil sludge. 【Background technique】 [0002] Oil sludge refers to the sludge generated during the oil field production process due to crude oil extraction, storage, gathering, processing, and crude oil production fluid treatment. It is famous for containing crude oil or some components in crude oil, mainly divided into: landing sludge, clear tank sludge, flotation scum, etc. [0003] Oil sludge generally has an oil content of 10-50% and a water content of 40-90%. In my country's petrochemical industry, an average of 800,000 tons of tank bottom sludge and pond bottom sludge are produced every year. Shengli Oilfield produces 100,000 tons of oily sludge every year. Above, Dagang Oilfield produces about 150,000 tons of oily sludge every year, and Henan Oilfield produces 5×104m3 oily sludge every year. Oily sludge contains a large amount...

AI Technical Summary

Problems solved by technology

After the oily sludge is incinerated, a variety of harmful substances are almost completely removed, and the effect is good, but the investment is large, the cost is high, and combustion-supporting fuel is often added, the incineration process is accompanied by serious air pollution, and crude oil cannot be recovered, so The actual utilization rate of incinerators in our country is low; the hot washing method is the preferred method adopted by the U.S. Environmental Protection Agency to deal with oily sludge. This method has low energy consumption and low cost. However, this method still has the problem of low recovery efficiency and needs to be further improved; thermal desorption is a modified high-temperature treatment method for sludge. Oil sludge is heated to a certain temperature under anaerobic conditions to make hydrocarbons and Organic matter desorption, this process was rapidly developed and applied in foreign countries in the early 1990s. It is mainly suitable for treating oily sludge with an oil content greater than 30%. This process has high technical content, high requirements for reaction conditions, and relatively high treatment costs. High, the operation is relatively complicated, and needs to be further improved; solvent extraction is an effective technology for treating oily sludge with 10%-20% oily sludge and small particles. This process uses extraction agents to dissolve oily sludge. After stirring and centrifuging, most of the organic matter and oil are extracted from the mud by the extractant, and then the extract is recovered for distillation to separate the solvent from the mixture for recycling, and the recovered oil is used for back refining, but this process recycles The cost is high and the efficiency is low, and key technical problems need to be further solved

[0005] Although there are many treatment methods for oily sludge, they are not widely promoted due to the disadvantages of low pertinence and high treatment costs.