With China's rapid economic development, accompanied by a large number of problems of industrial pollution, the environmental problem has become a bottleneck of China's economic and social sustainable development. Environmental pollution is a pollutant emissions in the production of pointer construction projects in the governance, including waste water, waste gas and noise pollution etc. according to the "measures for the supervision and administration of the three at the same time, pollution control facilities in construction projects, shall at the same time with the main project design, construction, and put into use. The pollution prevention and control facilities shall meet the requirements of the EIA document approved, shall not be dismantled or left idle construction units in the project construction. The preliminary design stage shall be put into the construction of pollution control project planning.
The main industrial wastewater treatment technology:
| Technical Name | Ajax |
| grating | With the composition of the metal frame is composed of one or more groups of parallel, tilt mounted in the grille wells, the inlet is set well or adjusting pool, for suspended solids and debris removal may clog pump pipe valve group and relatively large, in order to ensure the normal operation of the subsequent processing facilities. |
| neutralization | By adding acid or alkaline neutralizing agent, pH control of wastewater. |
| coagulate | The coagulant under the action of the colloidal and suspended solids destabilization and bonding. |
| flotation | Flotation is an effective method for the separation of solid-liquid separation and liquid-liquid separation, fine particles used in particle density close to or less than the density of water. |
| Stripping and stripping | The air is blowing into the waste water, and waste water is fully exposed to air, through the gas-liquid interface in the wastewater dissolved gas or volatile solute transfer to the gas phase, so as to achieve the purpose of gas stripping removal of pollutants. The waste water in direct contact with water vapor, the volatile substances in waste water diffusion into the gas phase, in order to achieve the separation of pollution. Blow off and usually used to dissolved gas removal in wastewater by extraction and volatile organic compounds. |
| chemical precipitation | The boss to the wastewater of a chemical substance, making it and some dissolved material replacement, forming insoluble salt precipitation method, thereby reducing the solubility of pollutants in water. |
| oxidation-reduction | To the wastewater adding an oxidizing or reducing agent and by electrolysis method, oxidation or reduction of toxic and harmful substances in waste water and make it into harmless non-toxic or low toxicity of new substances. |
| advanced oxidation | Direct mineralization of organic wastewater by hydroxyl radical in high concentration or by oxidation of pollutants increase the biodegradability of the most organic matter decomposition or complete mineralization. Advanced oxidation technology mainly includes the common air wet oxidation, catalytic wet oxidation, supercritical water oxidation, photochemical oxidation. |
| adsorb | Through the adsorbent (such as activated carbon) or adsorption equipment, the adsorption of pollutants in wastewater, to achieve the purpose of wastewater purification |
| ion (ic) exchange | Ion exchange is ion by ion exchange agent on the process of ion exchange reaction with water to remove the harmful ions. The ion exchange process to include the exchange, backwashing, regeneration and cleaning in four stages. |
| Membrane separation | Membrane separation is the use of the material through a layer of special film speed difference and separation, a method for separating and concentrating or desalination, membrane separation process in industrial application with microfiltration, ultrafiltration, nanofiltration, reverse osmosis, dialysis, electrodialysis, gas separation, pervaporation, membrane technology, is widely used in petroleum. The chemical industry, environmental protection, energy, electronics and other industries. |
| activated sludge method | Activated sludge is the most widely used method of wastewater treatment. It can remove dissolved and colloidal biodegradable organic matter from wastewater and suspended solids and other substances that can be adsorbed by activated sludge. |
| bio | Biofilm wastewater treatment is the use of artificial measures, optimize the microbial flora, native and other micro metazoan animal growth on the carrier, biofilm formation, with wastewater in constant contact with the substrate, by adsorption, mass transfer, biological metabolic activities such as purification of wastewater. Mainly used for removal of dissolved organic pollutants. |
| membrane bioreactor | A new high efficient wastewater treatment technology of membrane separation technology and biological treatment technology combined to form. |
| Anaerobic biological treatment | Anaerobic biological treatment method is the use of facultative anaerobic bacteria and anaerobic bacteria macromolecular organic matter in sewage is degraded into low molecular compounds, and then converted to methane, organic wastewater treatment method of carbon dioxide, divided into acidic and alkaline digestion digestion in two stages. |
The main control technology of industrial gas:
| Technical Name | Ajax |
| adsorb | Adsorption is the use of porous solid adsorbent (gas or liquid) in a mixture of one or more components or the accumulation of concentration and thus achieve the purpose of separation on the surface of the operation. |
| wash | The general water solid impurities in waste gas and gas dissolved in water can be removed, and the exhaust gas cooling, can be used as pretreatment of biological treatment and plasma treatment. |
| condensation | Condensation is the use of gas with different pressure saturated steam under different temperature and pressure, lowering the temperature or increase the pressure under the condition of certain pollutants to purify or condense out, the purpose of recycling, can even use different condensing temperatures, separate the different pollutants to achieve the purpose of recycling, waste gas. |
| masking methed | The fragrant smell and odor were more intense, with masking odor, which can be received, and is applicable to immediately, temporarily eliminating low concentration of odorous gases affect the situation. |
| Dilution | The smell of gas through the chimney discharged to the atmosphere, or odorless air dilution, reduce the odor substance to reduce odor. |
| Chemical absorption | According to the composition of the contaminants by using strong acid (sulfuric acid), alkali (sodium hydroxide), a strong oxidizing agent (sodium hypochlorite) as washing spray solution and gas pollutant molecules in gas liquid contact, the composition of the gas phase pollutants transferred to the liquid phase, and through the composition of chemicals and pollutants, oxidation or other chemical reaction to the pollutants. |
| direct flame | Also known as thermal oxidation, thermal combustion method, namely the use of high temperature (>800 DEG C) to the decomposition of organic matter. This method is mainly used for the purification of VOCs waste gas with high concentration. |
| catalytic combustion method | It is the catalyst in direct combustion based on the method (such as MnO2), greatly reduce the exhaust gas and the reaction activation energy, which can burn at low temperature, no two pollution, simple process, convenient operation, good safety. |
| Regenerative catalytic oxidation combustion method | In order to improve the economy, to achieve the purpose of energy saving and emission control reflect harmless, resources the purpose of improving the catalytic combustion, increase heat recycling, the regenerative catalytic combustion process (RCO). |
| plasma technology | Under the influence of external electric field, the medium to produce a large number of articles can discharge the pollutant molecular electron bombardment, ionization, dissociation and excitation, and then triggered a series of complex physical and chemical reaction, make complex macromolecules into simple small molecule material safety, or toxic and harmful substances into non-toxic or low toxic low harmful substances, so that the degradation of pollutants will be removed. |
| Photocatalytic Oxidation | In the high-energy ultraviolet C light irradiation, the O2 odor is decomposed to generate free oxygen, free oxygen carrying negative charge imbalance, need to combine to form O2, carrying positive charge free oxygen itself has strong oxidation, ultraviolet light irradiation in high energy C, O3 oxidation, the combined effects of free oxygen ions radical, inorganic or organic polymer malodorous substances of low molecular substances change into water and carbon dioxide, non-toxic and harmless. |
| bioanalysis | The exhaust gas collection system to collect from biofilter deodorization device, the exhaust gas through the wet filter layer and filled with porous microbial activity, adsorption of malodorous substances by microbial cells, absorption and degradation of microbial cell function, small size, large surface area, strong adsorption, metabolism characteristics of various types of malodorous substances. After adsorption is decomposed into CO2, H2O and other simple inorganic non-toxic and harmless. |
The general working process of environmental pollution control is as follows:
(1) preparation, site survey and design stage.
Accept the construction unit commissioned after the first full investigation of the design documents of construction projects and the project site, understand the production process of raw materials, components, types of pollutants, and combined with the production workshop layout, to develop pollutant collection methods and treatment process suitable, so as to formulate a design scheme of pollution control projects.
(2) construction drawing design stage.
With the construction unit fully approached, understand the work process and operation mode of each sewage production process, and on-site investigation, draw detailed data, and draw up feasible construction drawings.
(3) equipment procurement, on-site construction and installation stage.
After the completion of the construction drawings, first of all, the production of pollution control equipment, procurement, as well as in accordance with the construction drawings of pollutants collection, control equipment on-site construction and installation.
(4) commissioning stage.
After the environmental protection treatment facilities are installed, they can enter the trial production stage, start the commissioning of the pollution control equipment, ensure the collection of pollutants, and control the normal and stable operation of the equipment.