Technical assistance: Ammonia nitrogen treatment issues
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This post was last edited by hesonchang214 on 2011-10-24 at 22:38. The ammonia nitrogen level is around 10,000; the water volume is not large, about 5 tons per day, and it contains some sludge. I would like to ask the experts here how to deal with this situation?
This post was last edited by hesonchang214 on 2011-10-24 at 22:39. The amount of water is low; if there are no other substances present, it can be sold to other wastewater treatment plants as a nitrogen source!
With such a small amount of water, if there are no other impurities in it, it can be used as a liquid fertilizer. If there are other impurities, it is recommended to use coagulation sedimentation for treatment. Although the treatment cost is high, the initial investment is low and the treatment effect is good. It involves using magnesium salts, phosphates, and ammonia nitrogen to produce struvite.
For small volumes of water, stripping can be used: the pH is adjusted to 11 and the temperature to 40°C; with two stages of stripping, the ammonia nitrogen level in the effluent can be reduced to below 100. Currently, there are ready-made ammonia stripping towers available on the market, or it is also simple to build one oneself.
This post was last edited by hesonchang214 on 2011-10-24 at 22:39. It’s sufficient to install a Hanovia UV sterilization system – it can break down organic substances as well as kill bacteria, and it’s also inexpensive!
This post was last edited by hesonchang214 on 2011-10-24 at 22:39. I agree with what was said in post 2; the P-salt and Mg-salt mentioned in post 3 both represent operating costs, and the MAP method does not guarantee a certain removal rate. Post 4 suggests that stripping requires further biochemical treatment, while post 5 seems to be advertising. Hehe!
This post was last edited by hesonchang214 on 2011-10-24 22:40. Activated carbon adsorption or biological biofilm formation?
Reply to 4# solomono: With such a small amount of water, isn’t the cost of using ammonia stripping a bit high?
Reply to 6# zzjgo: It is possible to have other sewage treatment plants handle it, but first there must be a place to receive the sewage for treatment. Furthermore, although 5 tons is not a large amount, dilution requires a considerable volume of water; therefore, other wastewater treatment plants need to have a processing capacity of at least hundreds of tons to ensure proper treatment. Additionally, wastewater treatment certainly incurs costs, and P and M salts obviously require expenses. The treatment process is unstable; in fact, coagulation sedimentation is the method that makes it easiest to achieve satisfactory treatment results. Controlling this coagulation sedimentation process is relatively simple – it involves adjusting the ratio as well as the pH value. Even if the chemicals cannot be added exactly in the prescribed ratios, it still affects the efficiency of treatment, though not necessarily its effectiveness. Give it a try; the effect is pretty good.
Reply to 9# cdpulin: I think what is meant by the second floor is municipal wastewater treatment plants that handle large amounts of industrial water. As for the MAP method, I have conducted many experiments, and there are many factors that are difficult to control, such as pH, temperature, concentration, dosage of chemicals, and stirring speed. This is because the solubility product of magnesium phosphate is 1.04×10-24, while that of magnesium ammonium phosphate is 2.5×10-13; hence, the results are unstable.
Reply to 10# zzjgo: From the experiments and small-scale projects I’ve carried out, the results are good, and the conditions are easy to control. A removal rate of 90-95% can be achieved with good control; even if it’s slightly lower, 85% is also acceptable.