Petroleum chemical industry uses petroleum as the main raw material for production. It mainly performs chemical treatment processes such as cracking, fractionation, reforming and synthesis of petroleum. During the entire production and processing process, a large amount of petrochemical wastewater will be formed. If it is not treated properly, it will be harmful to the natural environment. cause serious pollution. Therefore, in the actual petrochemical production process, it is necessary to conduct scientific and reasonable analysis of petrochemical wastewater and adopt effective treatment technologies to improve the treatment effect of petrochemical wastewater and reduce its impact on the surrounding environment. its pollution to the surrounding environment. Characteristics of petrochemical wastewater Petrochemical wastewater has a variety of types, complex composition, high toxicity, inhibition of biodegradation and high concentration. The main characteristics are as follows: 1. Large water volume, complex water quality and large changes. Various solvents, auxiliaries and additives, and then undergo various reactions. Therefore, the amount of sewage water is large, and the composition is quite complex. 2. Serious organic pollution. The organic matter contained in petrochemical wastewater is mainly hydrocarbons and their derivatives. After the high-concentration waste liquid discharged from some petrochemical plants is treated by incineration or other appropriate methods, the COD
is still high. 3. Heavy metals are contained in sewage. Many reactions in petrochemical production are completed under the action of catalysts. A large petrochemical plant can use dozens of catalysts. Therefore, sewage often contains heavy metals. Composition and sources of petrochemical wastewater Due to the wide variety of pollutants contained in petrochemical wastewater, the pollutant components in it are also very rich. According to incomplete testing, it can be known that it contains oil, sulfur, phenol, COD, polycyclic aromatic compounds , aromatic amine compounds and heterocyclic compounds, etc. 1 Main sources of oily wastewater: condensed water, medium water, generated water in contact with oil products during the process, oil product washing water, oil product carrier ballast water, circulating cooling water, oil product oil gas condensate water, coking and decoking wastewater and Surface water contaminated with oil. 2 Main sources of phenol-containing wastewater: Atmospheric and vacuum delayed coking, catalytic cracking and phenol-acetone, m-cresol, bisphenol A and other production devices. 3 Main sources of sulfur-containing wastewater: secondary processing units of refineries, drainage of separation tanks, condensation and separation of oil products and oil and gas, and aromatics complexes. 4 Main sources of cyanide-containing wastewater: acrylonitrile plant, acrylic fiber factory polymerization workshop, spinning workshop and recycling workshop drainage, rubber plant. 5 Main sources of aldehyde-containing wastewater: acetaldehyde plant, vinylon spinning plant, vinyl acetate plant, formaldehyde plant, etc. 6 Main sources of benzene-containing wastewater: benzene plant, styrene plant, polystyrene plant, ethylbenzene plant, alkylbenzene plant and ethylene plant's pyrolysis quenching water washing wastewater. 7 Main sources of acid-base wastewater: washing water from oil refineries and petrochemical plants, cut-off water from finished product tanks, boiler water treatment drainage, and discharge water from acid-base mercury rooms. Hazards of petrochemical wastewater Petrochemical wastewater contains a large amount of toxic and harmful substances, especially some of which can be closely combined with phosphorus and nitrogen in the soil, which will lead to a serious shortage of phosphorus and nitrogen in the soil, thus affecting Serious adverse effects on the normal growth of plants. Petrochemical wastewater also contains a large amount of heavy metal elements, such as arsenic, chromium, nickel, beryllium, etc. Once it enters the human body with water, it will greatly increase the incidence of cancer and have a very serious impact on people's health. Untreated petrochemical wastewater is discharged into the river, and the oxygen content in the water will be greatly reduced, which will adversely affect the growth and development of animals and plants in the water, and the microorganisms in the water will degrade the organic substances in the petrochemical wastewater It will consume a large amount of oxygen dissolved in the water, and then destroy the balance of dissolved oxygen in the water, which is not conducive to the long-term development of animals and plants.
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