Biological treatment technology
Use microorganisms to decompose pollutants in industrial wastewater, with good treatment effect and less secondary pollution. It is mainly divided into anaerobic biological treatment and aerobic biological treatment:
Anaerobic biological treatment
Relies on anaerobic microorganisms, such as anaerobic bacteria, which grow and reproduce in an environment without or with extremely low oxygen content. Anaerobic biological treatment can produce methane, which is a valuable energy source. Suitable for treating high-concentration organic wastewater, common anaerobic treatment equipment includes upflow anaerobic sludge blanket reactor (UASB), anaerobic composite bed reactor (UBF), anaerobic expanded granular sludge blanket reactor (EGSB), etc.
Aerobic biological treatment
Biological treatment process carried out under aerobic conditions. Suitable for treating low to medium concentration organic wastewater. Common aerobic treatment equipment includes biological contact oxidation pond, activated sludge method, biological filter, etc. In practical applications, anaerobic biological treatment and aerobic biological treatment can be used alone or in combination to achieve the best treatment effect. For example, when treating high-concentration organic wastewater, anaerobic treatment can be used to reduce the COD concentration first, and then aerobic treatment can be used to further degrade organic matter.
Specific process examples
Activated sludge method: using activated sludge to degrade organic matter, suitable for treating wastewater with high and stable water quality requirements.
Sequencing batch activated sludge reactor (SBR): biodegradation, assisted by advanced oxidation treatment (such as Fenton reaction) to deeply degrade difficult-to-degrade organic matter.
Deep treatment technology
Using membrane technology (such as ultrafiltration, reverse osmosis) to further purify water quality can effectively remove residual organic matter, salt, etc. in wastewater, so that the treated wastewater meets higher discharge standards or meets reuse requirements.
In addition, different types of industrial wastewater require specific technologies or combined processes for treatment due to their different compositions and characteristics:
Three high industrial wastewater: For industrial wastewater with high ammonia nitrogen, high salinity, and high COD, Espe Environmental Protection has the relevant ECSB anaerobic wastewater treatment technology. This technology uses a two-layer three-phase separator to achieve sludge interception; a fully sealed positive pressure system, no odor, no need for biogas storage tanks and odor treatment devices, no oxygen in the system, and no need for anti-corrosion of the tank wall; an external circulation design is adopted, and the circulation power does not rely on the COD concentration of the incoming water and the biogas production. For example, the Wuxi anaerobic biological wastewater treatment project is an application case of this technology.
Fine chemical wastewater: The treatment strategy is to integrate physical, chemical and biological treatment technologies into a system, including pretreatment, biochemical treatment and deep treatment. For example, evaporation and crystallization are used to treat high-salinity wastewater, combined with pretreatment processes such as regulating tanks, oil traps, iron-carbon-Fenton-coagulation and sedimentation, and biochemical treatment processes such as hydrolysis acidification + UASB + contact oxidation, which can treat wastewater with COD concentration exceeding 150,000 mg/L and achieve stable discharge standards.
Printing and dyeing wastewater: The combined process of the new anaerobic baffled reactor (ABR) and aerobic composite biofilm reactor can be introduced into the treatment of high-concentration printing and dyeing wastewater, and the core decontamination capacity of the reactor can be enhanced with artificially selected high-efficiency decolorization bacteria and aromatic pollutant degradation bacteria to improve the treatment efficiency.
https://www.renkeer.com/what-is-cod-bod-toc-tod/
Biological treatment technology
Use microorganisms to decompose pollutants in industrial wastewater, with good treatment effect and less secondary pollution. It is mainly divided into anaerobic biological treatment and aerobic biological treatment:
Anaerobic biological treatment
Relies on anaerobic microorganisms, such as anaerobic bacteria, which grow and reproduce in an environment without or with extremely low oxygen content. Anaerobic biological treatment can produce methane, which is a valuable energy source. Suitable for treating high-concentration organic wastewater, common anaerobic treatment equipment includes upflow anaerobic sludge blanket reactor (UASB), anaerobic composite bed reactor (UBF), anaerobic expanded granular sludge blanket reactor (EGSB), etc.
Aerobic biological treatment
Biological treatment process carried out under aerobic conditions. Suitable for treating low to medium concentration organic wastewater. Common aerobic treatment equipment includes biological contact oxidation pond, activated sludge method, biological filter, etc. In practical applications, anaerobic biological treatment and aerobic biological treatment can be used alone or in combination to achieve the best treatment effect. For example, when treating high-concentration organic wastewater, anaerobic treatment can be used to reduce the COD concentration first, and then aerobic treatment can be used to further degrade organic matter.
Specific process examples
Activated sludge method: using activated sludge to degrade organic matter, suitable for treating wastewater with high and stable water quality requirements.
Sequencing batch activated sludge reactor (SBR): biodegradation, assisted by advanced oxidation treatment (such as Fenton reaction) to deeply degrade difficult-to-degrade organic matter.
Deep treatment technology
Using membrane technology (such as ultrafiltration, reverse osmosis) to further purify water quality can effectively remove residual organic matter, salt, etc. in wastewater, so that the treated wastewater meets higher discharge standards or meets reuse requirements.
In addition, different types of industrial wastewater require specific technologies or combined processes for treatment due to their different compositions and characteristics:
Three high industrial wastewater: For industrial wastewater with high ammonia nitrogen, high salinity, and high COD, Espe Environmental Protection has the relevant ECSB anaerobic wastewater treatment technology. This technology uses a two-layer three-phase separator to achieve sludge interception; a fully sealed positive pressure system, no odor, no need for biogas storage tanks and odor treatment devices, no oxygen in the system, and no need for anti-corrosion of the tank wall; an external circulation design is adopted, and the circulation power does not rely on the COD concentration of the incoming water and the biogas production. For example, the Wuxi anaerobic biological wastewater treatment project is an application case of this technology.
Fine chemical wastewater: The treatment strategy is to integrate physical, chemical and biological treatment technologies into a system, including pretreatment, biochemical treatment and deep treatment. For example, evaporation and crystallization are used to treat high-salinity wastewater, combined with pretreatment processes such as regulating tanks, oil traps, iron-carbon-Fenton-coagulation and sedimentation, and biochemical treatment processes such as hydrolysis acidification + UASB + contact oxidation, which can treat wastewater with COD concentration exceeding 150,000 mg/L and achieve stable discharge standards.
Printing and dyeing wastewater: The combined process of the new anaerobic baffled reactor (ABR) and aerobic composite biofilm reactor can be introduced into the treatment of high-concentration printing and dyeing wastewater, and the core decontamination capacity of the reactor can be enhanced with artificially selected high-efficiency decolorization bacteria and aromatic pollutant degradation bacteria to improve the treatment efficiency.
https://www.renkeer.com/what-is-cod-bod-toc-tod/