In the sewage reuse treatment, due to the high cost, the seawater desalination process is rarely involved, so we will not analyze it here. Suspended matter, turbidity and oil can be removed and reached the standard through coagulation sedimentation and filtration process. Therefore, the key problem to be solved is the removal of COD
and ammonia nitrogen. COD removal In general, the COD concentration in the sewage after the secondary biochemical treatment has dropped below 100mg/L, and the BOD5 concentration is low. Activated carbon adsorption method and ozone pretreatment + biochemical method, etc. Using biochemical treatment to further degrade COD in sewage is the most economical treatment process. The disadvantage is that the COD concentration of the treated effluent is difficult to reach a very low level. When the required COD value is very low, other measures still need to be taken; activated carbon adsorption is a technically reliable and economically feasible method. The effluent COD can reach about 10mg/L. The downside is that it needs to be regenerated periodically. If there is an activated carbon production plant nearby to provide carbon replacement business, the activated carbon adsorption process is an ideal method. Sewage advanced treatment method; for the ozone pretreatment + biochemical treatment method, although the COD of the effluent can reach a lower level, as supplementary water for the circulating cooling system, it may not necessarily reduce the amount of scaling, and the use of ozone treatment will greatly reduce the amount of scaling. It will increase infrastructure investment and operating costs, and operation management is more complicated, so it should be carefully considered in actual engineering. Ammonia nitrogen removal The current treatment technologies for ammonia nitrogen-containing wastewater include: biological nitrification, ion exchange, stripping, liquid membrane, chlorination or adsorption, wet catalytic oxidation, etc. For secondary biochemical effluent with ammonia nitrogen concentration of tens of mg/L, nitrification, steam stripping and ion exchange methods are the most commonly used biological methods. Chlorination method should be used when the concentration of ammonia nitrogen is not high. Since biological nitrification and COD removal are combined, biological nitrification is the most economical method; for projects with high ammonia nitrogen concentration in the water and located in the south, ammonia blowing may be an economical option, but not in the northern region. Adoption; Ion exchange ammonia removal has not been applied in China, the investment is large and the process is complicated, so it should be carefully selected; when ammonia in water is used when the nitrogen concentration is low, chlorination deammoniation may be more economical, and this method can also be compared with other Ammonia removal processes are used in conjunction.
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