With the continuous development of industry, the discharge of oily wastewater is increasing, which has a serious impact on the environment. In order to protect the environment, oily wastewater treatment equipment has become an indispensable facility. This article will introduce the types, principles, applications and future development directions of oily wastewater treatment equipment.
1. Types of oily wastewater treatment equipment.
Oily wastewater treatment equipment is mainly divided into three categories: physical, chemical and biological.
1.Physical Law.
Physical methods mainly include gravity separation, filtration and adsorption. Gravity separation mainly uses the different densities of oil and water to make the oil float or sink through static to achieve the purpose of oil-water separation. The filtration method is to separate oil and water through a membrane or filter media. The adsorption method is to use an adsorbent to adsorb the oil, and then desorb the oil through regeneration**.
2.Chemical method.
Chemical methods mainly include coagulation and precipitation, electrolysis, chemical oxidation and reduction. Coagulation and precipitation are mainly separated by adding coagulants to condense the oil into large particles. Electrolysis is the use of electrolysis reactions to decompose or oxidize oil. Chemical oxidation is the oxidation and decomposition of oil through strong oxidants. The principle is also to reduce the oil to a harmless substance by adding a reducing agent.
3.Biological law.
The biological method mainly uses the metabolism of microorganisms to decompose oil into harmless substances. Biological oily wastewater treatment equipment usually includes activated sludge method, biological filter, biological turntable and biological contact oxidation tank.
Second, the principle of oily wastewater treatment equipment.
The principle of oily wastewater treatment equipment is mainly based on the difference in physical and chemical properties of oil and water in terms of density, viscosity, surface tension, etc., and the corresponding technical means are used to separate the oil from the wastewater, so as to achieve the purpose of purifying the wastewater. Specifically, the working principle of oily wastewater treatment equipment can be divided into the following steps:
1.Pretreatment.
The purpose of pretreatment is to remove large particles of impurities and suspended solids in the wastewater and create good conditions for subsequent treatment. Pretreatment typically includes processes such as grid filtration, sedimentation, coagulation, etc.
2.Oil-water separation.
Oil-water separation is the main link of oily wastewater treatment equipment, according to the difference in the physical and chemical properties of oil and water, different technical means are used to separate the oil from the wastewater. Such as gravity separation, filtration, adsorption, flotation and other processes.
3.Advanced treatment of wastewater.
The purpose of advanced wastewater treatment is to further remove trace pollutants in wastewater and make wastewater meet national or local discharge standards. Advanced treatment usually adopts biological or chemical methods, such as activated carbon adsorption, ozone oxidation, biological filter and other processes.
4.Sludge treatment.
Sludge treatment is an important part of the oily wastewater treatment process, mainly to treat the sludge produced in the sedimentation tank and biological reaction tank. Sludge treatment usually uses methods such as sludge dewatering, digestion and incineration.
3. Application of oily wastewater treatment equipment Oily wastewater treatment equipment is widely used in petrochemical, machinery manufacturing, food processing, textile printing and dyeing and other industries. These industries produce a large amount of oily wastewater in the production process, and the use of oily wastewater treatment equipment can effectively reduce the concentration of pollutants in the wastewater to meet the discharge standards, and at the same time improve the useful substances in the wastewater to realize the recycling of resources. 2024 Travel Guide