CN-121990741-A - Efficient oily sludge stacking process

CN121990741ACN 121990741 ACN121990741 ACN 121990741ACN-121990741-A

Abstract

The invention discloses a high-efficiency oily sludge stacking process, and belongs to the technical field of oily sludge treatment. The process comprises the following steps of S1, adding auxiliary materials into oily sludge, uniformly mixing a mixture of the oily sludge and the auxiliary materials to obtain an oily sludge mixture, S2, adding a nutrient solution into the oily sludge mixture, adjusting the water content of a mixed material, stacking to obtain an oily sludge mixture stack, S3, adding a composite microbial agent into the oily sludge mixture stack, and placing the oily sludge mixture stack into a reaction device for microbial degradation treatment. According to the invention, the low-cost co-metabolism matrix organic auxiliary materials are introduced and matched with the nutrient solution to stimulate microbial metabolism, so that a high-concentration high-activity functional flora ecological system is formed in the sludge mixture pile, and the composite microbial agent is introduced to strengthen the piling effect, so that the reduction of the oil content and the water content of the oil-containing sludge is realized, and the harmlessness and the reduction of the oil-containing sludge are further realized.

Inventors

SHAO ZHIGUO
FU XINGE
WANG QINGHONG
LIU GUANGQUAN
CHEN CHUNMAO
ZHANG MINGDONG
WEI NING
REN WEN
XIE SHUIXIANG

Assignees

中国石油天然气集团有限公司
中国石油集团安全环保技术研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. The efficient oily sludge stacking process is characterized by comprising the following steps of: s1, adding auxiliary materials into oily sludge, and uniformly mixing the mixture of the oily sludge and the auxiliary materials to obtain an oily sludge mixture; s2, adding nutrient solution into the oil sludge mixture, adjusting the water content of the mixture and stacking, Obtaining an oil sludge mixture pile; S3, adding the composite microbial agent into the sludge mixture pile body, and then placing the sludge mixture pile body into a reaction device for microbial degradation treatment.
2. The efficient oily sludge stacking process of claim 1, wherein the composite microbial agent comprises thermophilic bacteria and petroleum degrading bacteria.
3. The efficient oily sludge accumulation process according to claim 2, wherein the thermophilic bacteria are selected from the group consisting of Bacillus brevis, and the petroleum degrading bacteria are selected from one or more of the group consisting of Bacillus, pseudomonas, clostridium and Brucella.
4. The efficient oily sludge stacking process according to claim 3, wherein the mass ratio of the composite microbial agent to the volume mass ratio of the oily sludge mixture stack is 2-5%.
5. The efficient oily sludge stacking process according to claim 1, wherein the auxiliary material is one or more selected from the group consisting of livestock manure, plant straw and grain hulls, and the nutrient solution is animal manure leachate.
6. The efficient oily sludge stacking process according to claim 1, wherein the water content of the mixed material is 50-70%.
7. The efficient oily sludge stacking process according to claim 1, wherein the microbial degradation treatment comprises continuous aeration and oxygen supply to the reaction device, and aerobic fermentation is performed by using flora in the oily sludge mixture stack to complete the microbial degradation process of the oily sludge.
8. The efficient oily sludge stacking process according to claim 7, wherein the aeration rate in the aeration and oxygen supply process is 0.2-0.3 l/min/kg dry weight; the temperature of the aerobic fermentation is 50-70 ℃ and the period is 20-50 d.
9. The efficient oily sludge stacking process according to any one of claims 1-8, wherein the reaction device comprises a reactor, a supporting plate with a hole diameter is arranged in the reactor, an air inlet and a percolate outlet are respectively arranged at the bottom of the reactor, the air inlet is connected with an air pump through an air inlet pipeline, the air pump is used for aerating and supplying oxygen to the oily sludge mixture stack, the percolate outlet is connected with a percolate outlet pipeline, and the percolate outlet pipeline is used for discharging percolate after microbial degradation of the oily sludge.
10. The efficient oily sludge stacking process according to claim 9, wherein the top of the reactor is provided with two holes for inserting a thermometer and collecting gas, a flow controller is arranged on an air inlet pipeline between the air inlet and the air pump and used for regulating and controlling the aeration rate, and the supporting plate is covered with a nylon net and used for preventing the particles of the oily sludge mixture from blocking the vent holes.

Description

Efficient oily sludge stacking process Technical Field The invention belongs to the technical field of oily sludge treatment, and particularly relates to a high-efficiency oily sludge stacking process. Background The oily sludge is generated in links of petroleum and natural gas exploration, exploitation, storage and transportation, refining, oily sewage treatment and the like, and along with the rapid development of petroleum industry, the yield of the oily sludge is increased year by year. The average annual production of oily sludge in China has been counted to over five million tons, with a market size of nearly 3000 hundred million. The oily sludge contains a large amount of heavy metals, sulfides, benzene series and other substances, and the toxic and harmful compounds have stronger three-cause effect, thus bringing serious threat to human health and immeasurable harm to ecological natural environment. In the national hazardous waste list revised in 2021, various petrochemical sludges were identified as hazardous waste (HW 08 class). Therefore, reduction, harmless and recycling treatment of the oily sludge is imperative. The treatment technology of the oily sludge mainly comprises physical and chemical treatment and biological treatment. Common physical technologies include incineration, mechanical separation, pyrolysis and the like, and chemical technologies include a chemical cleaning method, a solvent extraction method, a supercritical water oxidation method and the like. Biotechnology includes soil cultivation, biological slurry reactor and stacking. The physical and chemical method has the problems of high energy consumption, complex process, high cost, secondary pollution and the like. The patent CN112939394A discloses an oil-containing sludge pyrolysis treatment process, which comprises the steps of crushing oil-containing sludge, conveying the crushed oil-containing sludge into a pyrolysis device for pyrolysis, wherein the temperature control range in the pyrolysis device is 500-800 ℃, high-temperature flue gas is in direct contact with the oil-containing sludge, the pyrolysis time control range is 60-120 minutes, up-to-standard sludge and flue gas containing combustible gas are generated, the flue gas is dedusted by a dedusting device and then is fed into a combustion chamber for combustion, high-temperature flue gas is generated after combustion, the high-temperature flue gas is cooled by a cooling device and then fed into a quenching device, the high-temperature flue gas is cooled to 180-200 ℃, low-temperature flue gas is generated, and the low-temperature flue gas is fed into waste gas treatment equipment for treatment, so that up-to-standard flue gas is generated and discharged. In order to provide enough reaction temperature, the technical scheme of the patent needs to consume a large amount of energy, and in order to treat various flue gases generated by the reaction, various treatment structures are required to be arranged to avoid secondary pollution, so that the cost is greatly increased. Compared with a physical and chemical method, the biological treatment has the advantages of safety, reliability, economy, high efficiency, simple operation and the like, and has obvious advantages in the aspect of treating the oily sludge with low oil content. Based on the advantages of low treatment cost, good effect, wide application range and the like of the stacking method, the environmental protection department in 2014 classifies the technology as the first technology for treating the petroleum hydrocarbon solid waste in the pollution site repair technology catalogue (first batch). However, the highest temperature of the traditional stacking is about 50 ℃, the high-temperature period is short in maintenance time, the stacking period is long, and the treatment efficiency is low. The bio-piling refers to a traditional process of piling up oily sludge, fertilizer and bulking agent (rice straw, sawdust, wheat straw and other organic materials) into piles, installing an explosion pipeline or stirring equipment in the piles, and performing biodegradation by utilizing bacteria. The physicochemical properties of the piled materials are regulated by adding the conditioner, and organic matters in the wastes are further decomposed by utilizing the proliferation and metabolism actions of various microorganisms in the piled bodies under the aerobic condition to obtain water, carbon dioxide, heat, humus and the like. For example, patent CN115677150a discloses a microbiological treatment method of oily sludge, which adopts biological method to treat oily sludge. According to the technical scheme, oil sludge is pretreated, impurities in the oil sludge are removed, auxiliary materials with the mass of 0.5-10% of that of the oil sludge are added, the oil sludge with the auxiliary materials is crushed and uniformly mixed to obtain an oil sludge mixture for later use, the oil sludge mixture is placed on a prefab