Eddy concave air flotation machine is mainly used for separation of fine suspended matter density close to the water and remove.Air flotation is produced by dissolved air system dissolved air water, after rapid decompression release produced a large number of tiny air bubbles in water, some bubble adhesion good flocculation impurity particles in the water on the surface, form the overall density less than 1 suspended solids, rising to the surface by buoyancy and make the solid-liquid separation of a kind of clean water act.
 
Air flotation can be widely used in water supply and drainage engineering, concrete application is as follows:
 


1. The feed water of the lake, river water as tap water, landscape water material to remove algae, etc
 


2. Sewage pretreatment and sludge concentration
 


3. Industrial water treatment:
 


Papermaking white pulp recovery and water reuse
 


Printing and dyeing wastewater chroma and impurity removal
 


In electroplating wastewater of various heavy metal ions removal
 


Separation, oil refining wastewater
 


The tanning waste water to remove impurities
 


Chemical industry, foodstuff industry, wool spinning, slaughtering, brewing, ore dressing, washing and other industrial wastewater treatment
 


The main design parameters of air flotation technology including the stay time, flocculation time and surface load rate and reflux ratio, dissolved air pressure, etc.The hydraulic residence time of gas floating pool for 5 ~ 35 min;Surface load rate is 5 ~ 9 m3 / h. (m2).
 


According to the requirements of treatment effect, can adjust the dissolved air pressure and reflux ratio, and can effectively reduce the operation and maintenance costs.Besides air flotation can solve the problem of precipitation can solve, and due to the short residence time, air float pool construction costs are less than settling basin, but it can get better treatment effect.For the above situation, the processing of air flotation technology is one of the most effective measures, is also one of the key projects of separation technology.
 
 
 
A. ZWF type vortex concave type series air flotation machine introduction:
 
 
 


ZWF series type vortex concave type flotation machine, is an introduction of the technology advanced sewage treatment equipment, reasonable design, convenient operation, economy running, it is made of micro air bubble aerator, directly to remove suspended solids from the wastewater.Vortex concave aerator will "micro bubbles" without the need to advance in the injected directly into the water soluble gas, and then through the perforated impeller "micro bubbles" uniform distribution in wastewater, so the whole operation process does not happen jam phenomenon, more do not need to be dissolved air pressure, air compressor and the circulating pump, etc.Raw sewage into the dosing first reaction zone, and then into the aeration zone and good contact with micro bubbles, ZWF type vortex concave air floating machine features: the micro air bubble is on the rise in the process of suspended solids float to the surface of slag scraper run along the liquid surface will be suspended to tilt 45 degrees of inclined plate, and then pushes it into the sludge discharge pipe groove, through the sludge discharge pipe groove into the sludge collection area.Sewage purification before emissions will be after a ramp at the bottom of the overflow groove, the overflow tank is used to control water of air flotation machine, ensure the liquid tank into the sludge discharge pipe, open throat flow pipe from the aeration period of stretching across the bottom of the air floatation tank.
 
 
2. ZWF type vortex concave air floating machine features:
 


The slots (1) no noise, no need to repair parts.
 


(2) don't need a circulation pump, all Yi Xun parts can be bought everywhere.
 


(3) do not need air compressor, equipment performance is good simple installation as a whole.
 


(4) do not need to be dissolving tank, save covers an area of 40% - 20%, save running into 30% - 50%.
 


(5) type ZWF aerator each power just 1.1 KW, 2.2 KW.
 


Air flotation (CAF), in vortex concave Cavitation Air Floatation) system is the world's original patent water treatment equipment, is the ministry of commerce and the export of the environmental protection bureau recommendation technology.CAF is dedicated to remove the oil in the industrial and urban sewage, jelly and suspended solids (SS) and design of the system.The air flotation system is composed of five parts, as shown:
 


After pretreatment of sewage containing small inflatable segment of vortex concave aerator, the sewage is on the rise in the process of the micro air bubble produced by charging period and aerator mix, aerator will the air through the ventilation pipe on the water transferred to underwater.Aerator at the bottom of the working principle is to use air delivery pipe perforated high-speed rotation of the impeller in the water to form a vacuum area, air through the aerator input on the surface of the liquid water, fill the vacuum, micro bubbles arise and spiral to rise to the surface, the oxygen in the air also will dissolve in the water.
 


Because of the air water mixture and liquid density between imbalance, produced a vertical upward buoyancy, the SS to the surface.Floatation process, the micro bubbles will be attached to the SS, reach the surface after SS is rely on support and maintain the bubbles in the water.Float on the surface of the SS intermittent chain mud scraper to remove.Mud scraper along the entire liquid level movement and push SS from the inlet of air floating tank in the sludge discharge pipe to the outlet.Sludge discharge pipe in horizontal propellers, will the collected sludge into sets of mud pool.After purification of sewage flow into the overflow tank gravity to biochemical treatment.Open return piping from the aeration period of stretching across the bottom of the air floatation tank.At the same time of micro bubble, vortex concave aeration has the opportunity to return line of bottom to form a negative pressure zone, the negative pressure effect can make the waste water from the bottom to the aeration zone, and then return air flotation segment.This process ensures that about 40% of the reverse flow of polluted water and the absence of water gas float can still work.