COD is also called chemical oxygen demand , which refers to the amount required to react the substances in water that need to be oxidized through a certain method. Generally, the higher the COD value, the higher the degree of contamination of the water. High-salt wastewater contains a variety of inorganic salt ions. Don’t underestimate these small things. They are indispensable for the generation of microorganisms. However, if the depth is too high, it will inhibit and poison microorganisms, affecting the purification effect of the biological treatment system. At present, the papermaking industry, garbage leachate, etc. are relatively common high-concentration organic wastewater, and their raw water COD content may reach tens of thousands.
destroys water balance and contains highly toxic organic pollutants, which can be said to be the two major hazards of high salt and high COD wastewater. In recent years, environmental protection workers at home and abroad have long researched and explored. There are still many methods suitable for high-salt and high-COD wastewater treatment. Let’s take a look at the advantages and disadvantages of the subdivided treatment methods.
(1) Physical method The disadvantage of physical method is that it has good removal effect on the treatment of granule COD, but it is a bit reluctant for those soluble CODs.
(2) Chemical method The chemical method reacts fiercely and the COD removal rate is also high. The disadvantage is that the operating cost is too high, so it is generally not given priority.
(3) Anaerobic method The disadvantage of anaerobic microbial treatment is that it cannot completely remove COD, and the time required for aerobic biological treatment will be relatively longer, so the required equipment will be slightly larger.
(4) Aerobic treatment The disadvantage of aerobic treatment is that its hydraulic load is not as high as that of the anaerobic reactor, so it is often treated as a re-treatment of anaerobic effluent to further oxidize and decompose the COD in the water.
As environmental protection puts higher and higher requirements for various industries, effectively treating wastewater has become a very important issue. Before performing wastewater treatment, the generated wastewater should be analyzed in a comprehensive manner, and one or more treatment technologies should be selected according to the characteristics of the wastewater to optimize and integrate the wastewater treatment. Only by effectively solving the problem of wastewater can we provide strong guarantees for the development of the industry.
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