Oil Skimmer

Articles

Oil skimmer or oil skimmer is one of the most important equipment in the wastewater treatment industry that is used to separate the oil surface on the water. By removing oil and oil layers from the water, this device has a great impact on improving the water quality of refineries, refineries and aquaculture ponds.
The use of these devices, depending on the purity of the water required, may be selected as a pre-treatment stage for wastewater. These devices can be classified based on several important factors, the most important of which is the method of collecting oil levels on the water. The most common types of oil skimmers are belt, rope, funnel, float, rope, and disc models.
The basis of oil skimmers is based on the density difference between the two levels, which prevents them from mixing with each other. Accordingly, in their design and construction, they use the difference in surface tension between water and oil, and according to that, they absorb the oil absorbing belts in the device, which finally achieve the separation of the two desired surfaces. Although they are designed to collect oil, they do not produce the same results.
With the help of oil skimmer, aerobic and anaerobic bacteria in oils on water can be removed. There are several benefits to using oil skimmers, some of which we will mention. These include reducing costs, increasing equipment life, and automating the process. In many factories and industrial centers, due to continuous operation, the possibility of mixing water and petroleum products is very high, and this technology can be used to separate surface oils from water.
Sludge dryer
Every process that takes place in nature and industry, in addition to the product of the process, leaves behind a waste material that is commonly referred to as sludge in wastewater treatment, which must be disposed of properly. To remove sludge, it is usually dried by dewatering, which is called the sludge drying process. The working method of the sludge dryer is usually using the method of concentration and dewatering. In order to prepare the sludge, the mineral chemicals of aluminum sulfate, iron sulfate, iron chloride, and chitosan organic polychlorite systems, and carboxymethyl cellulose are used.
Drying beds and lagoons, in addition to the problems caused by high odors, require a lot of space for dewatering operations. Thermal dryers are also not optimal in terms of operating costs due to their very high energy consumption. In addition, the emission of exhaust gases that lead to environmental pollution adds to the problems of using this process.
Sludge that has been completely digested and stabilized by one of the aerobic or anaerobic methods should be gray in color and free of unpleasant odors. If the concentration of sludge is increased to 50 to 85%, they can take it out of the treatment plant, and if they want to package the sludge in powder form and provide it to farmers, they must increase its moisture content to more than 15%.
There are various methods for drying sludge, some of the most important of which include the use of sludge drying substrates, the use of mechanical methods, the use of lakes or sludge drying ponds, thermal methods, and Spray dryer pointed.
Wetland in wastewater treatment
One of the most suitable methods in wastewater treatment is the use of wetlands (artificial reed system) which is done with the help of treatment plants and in developed countries, this method is mostly used in wastewater treatment. The use of wetland for wastewater treatment dates back to the life of the earth.
Wetlands are divided into natural and artificial. In the natural Wetland method, wastewater is treated in an uncontrolled manner, and superficial plants such as straw that grow in wetlands are not recommended in wastewater treatment due to the lack of control of this method. In this system, the existing capacities in nature are used because this method does not require cost and expertise and is suitable for small places such as villages. Natural wetlands purify bacteria, water and other contaminants by breaking down and absorbing nutrients from the water.
In the synthetic form, first introduced in 1950 by Dr. Keith Seidel in Germany for wastewater treatment, human structures are used to treat wastewater. This method, by using a variety of methods that are less expensive and easier to operate, also play an effective role in improving the environment. Artificial wetlands are made up of a series of pools or cells that have different functions, and the microorganisms that live on these plants convert nitrogen and phosphorus into nutrients.
Artificial wetlands where current flows below the surface of the gravel or sand media are called subsurface flow (HSF) systems. Artificial wetlands are built to achieve four main goals, which include improving water quality, flood control, compensating and helping to balance changes resulting from agricultural and urban development in natural wetlands, and using them to produce food and wood. .