Wastewater Sewage Water Treatment Process

Wastewater Sewage Water Treatment is a process of purifying sewage by separating pollutants contained in sewage or converting them into harmless substances through physical, chemical or biological treatment methods to make sewage meet the water quality requirements for drainage or reuse.

Physical Method: Physical or mechanical separation process. Filtering, sedimentation, centrifugal separation, floating, etc

Chemical Method: conversion process in which chemical substances are added to react with harmful substances in sewage. Neutralization, oxidation, reduction, decomposition, coagulation, chemical precipitation, etc

Physicochemical Method: Physical and chemical separation process. Air stripping, stripping, adsorption, extraction, ion exchange, electrodialysis, reverse osmosis, etc

Biological Method: a metabolic process in which microorganisms oxidize and decompose organic substances in sewage. Activated sludge, biological filter, biological rotary table, oxidation pond, anaerobic digestion, etc

Separation Technology of Insoluble Pollutants:

Gravity Sedimentation Process: Grit chamber (horizontal flow, vertical flow, rotational flow, aeration), Sedimentation chamber (horizontal flow, vertical flow, radial flow, oblique flow).

Coagulation Clarification Process

Buoyancy Floating Process: Oil separation and Air flotation;

Others Process: Resistance interception, Centrifugal force separation, Magnetic force separation

Biochemical Transformation Technology of Pollutants:

Activated Sludge Process: SBR, AO, AAO, Oxidation ditch, etc

Biological Membrane Process: Biological filter, Biological rotary disc, Biological contact oxidation tank, etc

Anaerobic Biological Treatment Process: Anaerobic digestion, Hydrolysis acidification tank, UASB, etc

Biological Treatment Process Under Natural Conditions: Stabilization pond, Ecosystem pond, Land treatment method

Chemical Conversion Technology of Pollutants:

Neutralization Method: acid-base neutralization

Chemical Precipitation Method: hydroxide precipitation, ferrite precipitation, other chemical precipitation

Oxidation Reduction Method: reagent oxidation method, reagent reduction method, electrochemical method

Chemical and Physical Disinfection Method: ozone, ultraviolet ray, chlorine dioxide, chlorine, sodium hypochlorite

Physicochemical Separation Technology of Dissolved Pollutants:

Adsorption Method

Ion exchange Method

Membrane Separation Method: Diffusion dialysis, Electrodialysis, Reverse Osmosis, Ultrafiltration, Nanofiltration, Microfiltration

Other Separation Methods: stripping and stripping, extraction, evaporation, crystallization, freezing

Common Chemical Methods for Wastewater Treatment:

Coagulation: Add electrolyte into the colloidal turbid liquid to condense the colloidal substances in the water, so as to separate it from the water. The coagulants include aluminum sulfate, alum, polyaluminum chloride, ferrous sulfate, ferric chloride and other oily wastewater, dyeing wastewater, gas station wastewater, wool washing wastewater, etc

Neutralization: Acid-base neutralization, pH reaching neutral lime, limestone, dolomite and other acidic wastewater, CO2 neutralization alkaline wastewater, sulfuric acid plant wastewater, printing and dyeing wastewater, etc

Oxidation and Reduction: Add oxidation (or reduction) agent to oxidize (or reduce) substances in wastewater into harmless substances Oxidants include air (O2), bleaching powder, chlorine, ozone and other phenolic, cyanide, sulfur chromium, mercury wastewater, printing and dyeing, hospital wastewater, etc

Electrolysis: Insert an electrode plate into the waste water. After electrification, the charged ions in the waste water become neutral atomic power supply. The electrode plate and other chromium and cyanide containing (electroplating) waste water, wool spinning waste water

Extraction: Put the solvent insoluble in water into the wastewater to make the solute in the wastewater dissolve in this solvent, and then use the relative density difference between solvent and water to separate the solvent

Extractant: Butyl acetate, benzene, N-503 and other equipment including pulse sieve plate tower, centrifugal extractor, etc

Adsorption (including ion exchange) of phenol containing wastewater will make the organic or inorganic substances dissolved in the sewage adsorbed on the adsorbent through solid adsorbent. The adsorbents for treatment of the wastewater include activated carbon, coal cinder, soil and other adsorption towers, regeneration device dyeing, pigment wastewater, phenol, mercury, chromium, cyanide, and color, odor and taste removal for advanced treatment.

Wastewater Sewage Water Treatment is widely used in construction, agriculture, transportation, energy, petrochemical, environmental protection, urban landscape, medical, catering and other fields.

#QDEVU #WATERTREATMENT #WASTEWATERTREATMENT #SEWAGEWATERTREATMENT