The difference between industrial sewage treatment and domestic sewage treatment is analyzed

- Aug 27, 2019-

Don't think that if it's all sewage, the equipment can handle it. It's not.
Why else distinguish between industrial sewage and domestic sewage?
In contrast, it is obvious that industrial sewage treatment is much more difficult, and of course domestic sewage also has some difficulties. In other words, the quality and quantity of domestic sewage is relatively stable, compared with industrial wastewater, which is difficult to degrade and less toxic and harmful substances, and the treatment process is stable and easier to treat.
Below, in detail to explain the difference between industrial sewage treatment and domestic sewage treatment?
Industrial wastewater according to the production process of different industries, the amount of water produced is also varied, treatment methods are not the same.
Industrial sewage treatment focuses on the treatment of industrial waste residue and those chemical elements that are harmful to the environment.
Industrial sewage is more complex, see the kind of your sewage, use different methods, probably physical, chemical, biological, and so on, depending on the type of sewage.
Industrial sewage pool cleaning mainly includes: gate slag, sediment, biological sludge, etc. Timely discharge of sludge is a very important work in the operation and management of sewage pool.
Industrial sewage contains a large number of organic matter, if not timely treatment, will produce anaerobic fermentation, resulting in sludge floating, not only destroyed the normal work of the sedimentation tank, and use water quality deterioration.
The initial precipitation also contains pathogens and heavy metal compounds, etc. When the discharge of sludge is not complete, the tank should be stopped (emptied) by manual flushing method.
Maintenance and management of mechanical sludge discharging cleaning equipment should be strengthened in the sedimentation tank. Once mechanical sludge discharging equipment fails, timely repair should be conducted to avoid excessive sludge accumulation at the bottom of the tank, affecting the effluent quality.
The test indexes of industrial sewage treatment are mainly whether the inlet water quality design can withstand and the effluent water quality can meet the standard.
If biochemical treatment is adopted to treat sewage, COD, BOD, ammonia nitrogen and other indicators are required to be detected for the inlet water quality. COD is mainly used as the basis of aerobic or anaerobic process; BOD is used to investigate the biochemical degradation of sewage; ammonia nitrogen and other indicators are mainly used to see whether nutrients need to be added to sludge.
When monitoring the status of sewage treatment in the laboratory, it is mainly to monitor the quality of effluent, and the properties of sludge, such as MLSS, the number of bellworm fungi and so on, and the SVI index (volume index).
Activated sludge is prone to filamentous expansion, so the image of sewage treatment effect, so monitoring SVI can be used as a reference basis for whether sludge filamentous expansion, but this can not be judged that the sludge has expanded, but also need to combine with other parameters, such as the number of bellworm, rotifer, and so on.
The biogas produced by the anaerobic fermentation of industrial sewage is used to drive the biogas generator set to generate electricity, and the waste heat of the generator set can be fully used for the production of biogas, so that the comprehensive thermal efficiency reaches about 80%, which is much higher than the general 30~40% power generation efficiency.
Its working principle is based on electrochemistry, oxidation-reduction, physical adsorption and flocculation precipitation to treat wastewater.
The method has the advantages of wide application, good treatment effect, low cost, convenient operation and maintenance, and no need to consume electric power resources.
This process can greatly reduce COD and chroma, improve the biodegradability of wastewater, and remove ammonia nitrogen.
Traditionally used by micro electrolysis process of micro electrolysis material generally for scrap iron and wood charcoal, before use to add alkali activation, use easily in the process of passivation harden, and because of iron and carbon is physical contact, it is easy to form isolation layer between the micro electrolysis does not lose to continue, this led to the frequent replacement of micro electrolysis material, not only from volume high cost but also affect the wastewater treatment effect and efficiency.
In addition, the small surface area of traditional micro-electrolysis materials also makes waste water treatment take a long time, increasing the investment cost of tons of water, which seriously affects the utilization and promotion of micro-electrolysis process.
The whole process for raw sewage through the coarse screen after sewage lift pump ascension through the grille or sieve rate, after entering the grit chamber, after sand water separation of wastewater into the settling basin for the first time, more than for primary treatment (namely physical treatment), the pond water into biological processing equipment, at the beginning of the activated sludge and biological membrane method, (including aeration tank reactor of activated sludge method, oxidation ditch, etc., biological membrane method including biological filter, biological rotating disc, biological contact oxidation and biological fluidized bed), biological treatment of effluent into the secondary sedimentation tank, the second pond, the water is disinfected emissions or entering tertiary treatment,
At the end of the first treatment, it is the second treatment, and the third treatment includes biological nitrogen and phosphorus removal, coagulation and precipitation, sand filtration, activated carbon adsorption, ion exchange and electrodialysis.
Part of the sludge in the secondary sedimentation tank returns to the primary sedimentation tank or biological treatment equipment, part enters the sludge concentration tank, and then enters the sludge digestion tank. After dehydration and drying equipment, the sludge is finally used.
So, how to treat domestic sewage?
The main purpose of domestic sewage treatment is to remove organic COD in the water, which requires a certain amount of nutrients such as P and N, and is generally degraded by microorganisms in the activated sludge through biochemical methods.
As the core of domestic sewage treatment is the biochemical part, so we call sewage treatment process refers to this part, such as contact oxidation method, SBR method, A/O method, etc.
Biochemical treatment (including anaerobic and aerobic treatment) of domestic sewage is currently the most economical and most suitable sewage treatment process, and the choice of different sewage treatment processes according to the quantity, quality and site conditions has a decisive impact on investment and operating costs.

QUANSEN is a company specializing in the production of various sewage treatment flocculant, widely used in sewage treatment, production, sales, research and development has the domestic advanced technology.