Oil containing wastewater treatment equipment

Oil containing wastewater treatment equipmentUnder high pressure, water is dissolved into a large amount of body as the working liquid. When the pressure is suddenly reduced, several micro bubbles are released to bond with the impurities in the water after mixing reaction, so that their specific gravity is less than 1, and they float on the liquid surface to form a mixture of foam (water particles), so that pollutants can be separated from wastewater to achieve purification effect.

Floating equipment is a type of water treatment device that introduces or generates a large number of fine bubbles in water, causing the air to adhere to suspended particles in the form of highly dispersed small bubbles, resulting in a density lower than water. It uses the principle of buoyancy to make it float on the water surface, thereby achieving solid-liquid separation.
Floating methods can be divided into dispersed floating, dissolved floating (including vacuum floating), and electrolytic floating. Currently, it is involved in water supply, industrial wastewater, and urban sewage treatment. Floating equipment has advantages such as less investment, automation process, and convenient operation and management compared to other solid-liquid separation equipment

Installation:

1. Equipment lifting: There are four orifice plates on the inner wall of this equipment for lifting.

2. The elevation of the equipment can be installed overhead or placed on flat ground according to the needs of the project, and the stress surface of the equipment foundation is L1B.

3. The equipment foundation should be kept level, and the concrete foundation size of the equipment should be (L1+500) × (B+500).

4. Valves need to be added to the vent ports in the clear water area, separation area, and mixing area.

5. The connecting pipeline between sewage and reaction tank should be as short as possible to prevent flocs from being broken in the pipeline.

6. The sludge outlet can be connected to the sludge storage tank, and the connecting pipes and bends should not be too many. The shorter the pipe, the better.

7. The placement of the electrical box is generally based on the principles of safety and ease of operation. It can be placed on the side or nearby position of the escalator, but attention should be paid to moisture prevention, moisture resistance, and preventing corrosive substances from damaging electrical components.

8. Wiring: The terminals of the electrical cabinet should be connected to the junction box of the equipment according to the same number marked.

Winter maintenance

1、 Check whether the inlet sewage pump and reflux pump of the dissolved air flotation machine are frozen during work every day, including lubrication and oil filling of the water pump, tightness of the packing, sealing of the bottom valve, and oil filling of the air compressor.
2、 Check if the air filter water of the air compressor is frozen, in order to determine if the air compressor is operating normally, and if there are any noises or heating phenomena.
3、 Check whether the transmission part and scraper of the slag scraper have hardened or broken in cold conditions to avoid affecting its use.
4、 Pay attention to the mixing and storage tanks of coagulants to avoid freezing, and conduct small sample tests frequently.
5、 Inspect the valve pipelines of each device to prevent blockage, and place them in the "open" or "closed" position as required.
6、 When stopping the machine, the water must be drained completely to avoid freezing and blockage

Oil containing wastewater treatment equipmentclassification

1. Electrolytic flotation equipment
Electrolytic flotation equipment is used to directly electrolyze wastewater using non reactive yang and yin. The tiny bubbles of hydrogen and oxygen generated by electrolysis carry the flocculated suspension to the surface of the water. Achieve solid-liquid separation. The bubble size generated by electrolysis is much smaller than that generated by dissolution and dispersion, and does not generate turbulence. The pollutants removed by this device not only reduce BOD, but also oxidize, decolorize, and sterilize mechanical wastewater. It adapts to changes in wastewater load, generates less sludge, occupies less land, and does not produce noise. In recent years, it has developed rapidly. The electrolytic flotation equipment still faces issues such as high energy consumption and plate loss, which limits its widespread use.
2 Floating Equipment
Floating equipment relies on the centrifugal force of high-speed rotating impellers to create a vacuum negative pressure state, which sucks in air and forms fine bubbles that diffuse into the water. Bubbles rise from the bottom of the pool to the surface and adhere to suspended solids in the water, bringing them to the surface. Achieve solid-liquid separation. The formed floating slag is continuously scraped out of the pool by a slowly rotating scraper plate. The mechanical shear force of the water flow and the bubbles generated by the diffuser plate are relatively large (with a diameter of about 1mm), which are not easily adsorbed with small particles and flocs, and instead tend to break the flocs. Therefore, flotation is not suitable for treating wastewater containing small particles and flocs. The scope of this equipment includes small-scale sewage treatment projects such as painting, leather making, oil refining, printing and dyeing, chemistry, dairy processing, fiber, papermaking, food and beverage, slaughtering, textile, mechanical processing, municipal sewage, etc.

3 Vacuum Floating Equipment
The supersaturated air in water can be released in the form of fine bubbles during decompression, causing impurities particles in the water to adhere and float up. Achieve solid-liquid separation. If the air is first pressurized to dissolve in water to form a supersaturated solution, and then reduced to atmospheric pressure to allow the air to precipitate, it is called pressurized flotation; If wastewater is exposed to atmospheric pressure and then induced to dissolve under vacuum conditions, it is called vacuum flotation.
Dissolving vacuum flotation equipment is a flotation device that allows air to dissolve in water under normal pressure or pressure, and precipitate under negative pressure. The advantage of vacuum flotation equipment is that the formation of bubbles, their adhesion to particles, and the upward movement of bubbles and particle flocs all occur in a stable environment, with a low possibility of floc damage and low energy consumption required for the entire flotation process. Its disadvantage is that it has a limited solubility in water and is not suitable for wastewater containing suspended solids with concentrations greater than 250-300mg/L; Another disadvantage is that sealed containers require the installation of scraper machinery inside, which is structurally complex and therefore less commonly used in engineering practice. The amount of empty space that this device may obtain is limited by the achievable vacuum degree (usually 40kPa), resulting in a very limited amount of fine bubbles that can be precipitated, and the structure is complex, making maintenance inconvenient. It has been gradually phased out.
4. Pressure dissolution and flotation equipment
The pressurized flotation equipment pressurizes clean water to (3-4) × 105Pa, while adding air to dissolve the air in water, and then suddenly reduces it to atmospheric pressure. The air dissolved in water is in the form of tiny bubbles (with a diameter of about 20-100 μ m), which precipitate from the water and float suspended particles on the surface of the water. Thus achieving solid-liquid separation. Pressure dissolution flotation equipment is a type of flotation equipment with a relatively wide range. This device can be applied to various types of wastewater treatment (especially oily wastewater treatment), sludge concentration, and water supply treatment.
The pressurized flotation equipment mainly consists of three parts: air saturation equipment, air release and mixing equipment with wastewater, and solid-liquid or liquid-liquid separation equipment. According to the types, properties, and treatment efficiency of suspended solids in raw water, it can be divided into three types: partial pressure flotation, partial pressure flotation, and reflux pressure flotation.