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In the pulp (chemical) and paper manufacturing process to produce three major wastewater: black (red) liquid waste and paper machine white middle. Black (red) was mainly cooking pulp wastewater, including gray water pulp washing, screening, bleaching wastewater, waste paper machine white water of papermaking workshop. Wherein the waste water from cooking the most serious environmental pollution, accounting for 90% of the entire paper industry pollution. The main components of black liquor is lignin, cellulose, hemicellulose, simple sugars, organic acids and sodium hydroxide, which can be integrated recovery of useful substances; middle wastewater pollutants complex, containing a higher concentration of lignin, fibers hormone and other substances resinate difficult biodegradable components, and rich in bleaching stage of the environmental hazards produced large organic chloride, pH 9-11, suspended solids 1000mg / l or so, COD600-2500mg / l, color degree deep; paper machine white water by precipitation or flotation methods to achieve white water reuse, solid residue can also be re-pulping.
Because after front-end processing of mixed wastewater still contains a large number of short fibers and other suspended solids, through dosing flotation to further remove, to provide better conditions for the aerobic biological stage, to ensure a stable water standards. Flotation method is a solid - liquid or liquid - A method of liquid separation. It is dissolved in water by means of compressed air to produce a large number of micro air bubbles, it is close to the density of water and wastewater in solid or liquid particles adhering to form a density less than water flotation body under the action of buoyancy, floating to the surface, subjected to solid - liquid or liquid - liquid separation.
This process is used in the wastewater treatment system most widely used one of the most stable part of the return pressure flotation dissolved air flotation. The principle is that all raw sewage directly into the flocculation tank into the flotation system, part of the water by flotation reflux pump pressure into the solution tank, and dissolved gas cylinders through the air compressor to pass into the air. Back to the water dissolved in a solvent tank air to saturation, and recycling it back to the contact chamber flotation machine, use bubble instantaneous pressure release device, thereby forming a plurality of fine bubbles (diameter 8 ~ 10μm), impurities and air bubbles in the water the batt tablets stick to each other, forming a specific gravity less than water float to quickly surfaced, and maintained on the surface by scraping residue machine to scrape the residue collection tank to achieve removal.