The issue of reusing chemical wastewater

Check the specifications for circulating water to see if other parameters meet the requirements

It can certainly be used in circulating water; it’s just that the circulating water can be concentrated several times, so the scale and corrosion inhibitors for such water need to be reformulated.

It depends on the requirements of the equipment you plan to reuse regarding water quality, as well as other relevant parameters. Proper treatment of wastewater is necessary to meet the required standards before the water can be used; the key to this issue lies in the effectiveness of wastewater treatment.

It is also necessary to examine other indicators after wastewater treatment, and then make a decision based on the requirements of the equipment regarding the quality of the circulating water.

Further treatment is required; the COD value should appear to be below 30 in order to meet the reuse standards. Of course, this varies if higher requirements are imposed by the equipment. This post was last edited by li*ch1968 on 2009-4-17 07:52.]

According to the Design Code for Sewage Reuse Projects (GB-T50335-2002), it should be feasible~ However, please check the specification to see whether other parameters meet the requirements~ Pay special attention to ammonia nitrogen~ :)

Don’t focus only on the level of standard COD; it has little impact on circulating water

　　It is not suitable for use in circulating water, as the problems related to water quality in such systems do not become apparent in the short term. Using it recklessly can lead to corrosion or scaling, which is certainly not worth it. When considering its use in circulating water, factors such as salt content, suspended solids, and ammonia levels must also be taken into account; ammonia, in particular, is difficult to handle, and high levels of ammonia can cause corrosion in copper tube heat exchangers. From the perspectives of energy conservation, environmental protection, efficiency, and safety, it is best to treat wastewater through activated carbon filtration and reverse osmosis before reusing it (if reverse osmosis treatment equipment is available and there is enough capacity for such treatment).

1. The question of whether reclaimed water, or water that has undergone advanced treatment and filtration, can be reused is one that every petrochemical company considers. 2. Logically speaking, any water source that meets the requirements for circulating water can be used as a source for replenishing circulating water. However, in practice, as can be seen from technical exchanges among many manufacturers, there are not many successful cases of reusing water treated by sewage systems. . . 3. The biggest enemy of circulating water is dirt. . . There are many impurities. . . There is a lot of sediment. . . There are many floating objects. . . The pH is generally best when it is slightly alkaline. . . 4. In addition to the several indicators mentioned above, the calcium and magnesium ion levels as well as impurity analysis should also be conducted. . . The main concern is that after flowing through alternating hot and cold conditions, chemical changes may occur locally, leading to fouling and blockage of the heat exchange equipment. . . If everything is basically normal, the suspended solids and impurities can be removed through methods such as eddy current flotation (which can also be omitted), mechanical filtration units, activated carbon filtration, or ceramsite filtration, before pumping the water back into the circulating water replenishment system. . .

Analyze each specific issue individually. It is necessary to consider the equipment’s requirements regarding water quality