The COD level of the reclaimed water is around 70 mg; the impact of this on turbidity after it is added to the circulating water
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The COD of the reclaimed water is around 70 mg; the impact of this on turbidity after it is added to the circulating water. After adding circulating water here, the turbidity of the circulating water rose to over 100 mg/L. The COD of the circulating water has also risen to 117 mg. I’m not sure if this is caused by the water reused from treated wastewater.
SS in reclaimed wastewater directly affects turbidity, while ammonia and phosphorus in the water influence the growth of microorganisms in the circulating water; an increase in these microorganisms leads to an rise in turbidity.
Actually, COD70 is acceptable; however, a bactericide can be added to control the growth of microorganisms and reduce turbidity
The COD level is somewhat high; after concentration, it increases further, which creates a favorable environment for the growth of bacteria and algae. This allows for an increased frequency of application of disinfectants, with both oxidative and non-oxidative disinfectants being used alternately, along with regular use of sludge removal agents. The turbidity is too high. Excess suspended solids in water can provide nuclei for scaling agents in circulating water, accelerating scaling in the system. Deposition also occurs in areas with slow water flow, which affects the heat exchange efficiency of the heat exchanger. It is recommended to add side filtration to keep the turbidity of the circulating water below 50.
How is it best to apply oxidative and non-oxidative bactericides?
Cod70 is acceptable, but appropriate chemicals need to be added, and the turbidity should preferably be kept below 20 NTU
Do you use a UV system?
Don’t oxidizing bactericides need to be measured using residual chlorine?
To add, in my opinion, medium water inevitably contains a high amount of microorganisms, and these microorganisms will reproduce rapidly in the favorable conditions of a recirculation tank, such as temperature and nutrients. If possible, it is best to disinfect, treat with chemicals, filter, and then reuse it.
Ammonia nitrogen in reclaimed water also has a significant impact on circulating water. Check if the ammonia nitrogen level is very high
Can turbidity units also be expressed in mg/l? Isn’t it NTU? Is the turbidity of your circulating water that high? We keep the turbidity of our circulating water at around 5 NTU, and the wastewater is directly reused in the circulating water system!