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Preceding pretreatment mainly physico-chemical treatment, by adjusting the amount of water and mix thoroughly pool, water quality and stability of water and mix thoroughly.
Into the flotation machine, 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. Electro-coagulation is the use of soluble metal anodes produced in the electrolysis process to remove metal hydroxide flocculation water treatment process water pollutants. In reality, the anode material is usually readily available and inexpensive aluminum, iron, and iron, for example, the basic reaction is as follows: anode reaction: Fe + 2e → Fe2 + cathode reaction: 2H2O + 2e → H2 ↑ + 2OH- hydrolysis reaction: Fe2 + + 2OH- → Fe (OH) 2 ↓ electrolysis to generate ferrous hydroxide precipitate having a good flocculation, adsorption properties, can effectively remove contaminants from wastewater. While electrolytic cathode precipitation of hydrogen can form a large number of tiny bubbles, with good flotation separation, flocculation and therefore electric power is often referred to as flocculation - flotation process. In addition, the surface of the anode during the electrolysis electrochemical oxidation reaction occurs, and the cathode and ferrous ions produced by electrolysis precipitated nascent hydrogen has a strong reduction, so the electrical flocculation process also has a redox coagulating sedimentation can be effectively removed most of the wastewater suspended and colloidal dye, while the removal of heavy metal ions in wastewater, chromaticity. Avoid subsequent biological treatment facilities dampen, reduce the subsequent processing facility operating load.
And then into the conditioning tank, where regulation of water, water quality and PH. Effluent into the coagulating sedimentation tank by adding coagulant, coagulation produce floc precipitation to reduce the effluent chroma, CODcr, SS and other indicators. Coagulating sedimentation tank effluent into the hydrolysis acidification pool, by hydrolyzing bacteria and facultative anaerobic bacteria coordinating role of acid production, partially decomposed organic matter, and the insoluble organic matter into soluble organics, the biodegradable macromolecules into readily biodegradable small molecules to improve the wastewater biodegradability. Anoxic mainly biological contact oxidation pond was subjected to nitrification denitrification to remove ammonia, sludge in the anoxic tank for biological denitrification reaction, the conversion of nitrate to nitrogen gas to escape. Anoxic tank effluent into the biological contact oxidation pond, pool set up special biochemical efficient means to accumulate a large number of active micro-organisms, so that most of organic matter in sewage is degraded to CO2 and H2O, a small part into the activated sludge. Ammonia, organic nitrogen oxygen in the process of being converted to nitrite and nitrate nitrogen, is returned to the process section of hypoxia denitrification process degradation, removal, so as to achieve the purpose of denitrification. Sludge and biological contact oxidation pond water generated by the original insoluble small particles of suspended solids with water from flowing into the subsequent secondary settling tank, using its own gravity precipitation concentrated supernatant overflow into the automatic filter, secondary sedimentation tank sludge pump back to the biochemical pool and pool acid hydrolysis, on the one hand continue to provide its species, to maintain a high pool of biomass, the waste water is further purified into clean water tank after the water discharge standards.