243 / 2024-02-28 14:45:52

In-situ treatment of nitrogen, phosphorus and cyanobacteria in eutrophic water by The Water Cleanser™ bio-wax

The Water Cleanser™ bio-wax,eutrophic water,nutritive salt,cyanobacteria,In-situ treatment

The Water Cleanser™ bio-wax (hereinafter referred to as 'bio-wax') has micro-capillary structure and slow-release microbial promoting factor function, which can effectively stimulate the reproduction and growth of indigenous beneficial bacteria,  thus purifying nitrogen, phosphorus and other nutrients in water, and inhibiting the growth of cyanobacteria. However, due to the different types and content of microorganisms and nutrient concentration in natural water, the differences in the treatment effects and mechanisms of bio-wax application are still unclear. In this study, the effects of bio-wax on nitrogen and phosphorus removal,  and cyanobacteria inhibition in different environments were investigated through three months enclosure test and one year application demonstration. The results of enclosure test showed that in the range of 0.2-2.0 mg /L total nitrogen and 0.2-0.4 mg /L total phosphorus, the microbial biomass increased by 54.5% with the increase of initial nitrogen and phosphorus concentration. The reduction rates of total nitrogen, ammonia nitrogen and COD increased by 24.8%, 20.8% and 22.9%, respectively. Compared with the control group, bio-wax could reduce the cyanobacteria biomass by 32.5% to 55.6%. In water with different N and P concentrations, the reduction rate of cyanobacteria biomass decreased by 23.1% with the increase of initial N and P concentrations. The application demonstration results showed that after one year treatment, the initial ammonia nitrogen concentration of the three reservoirs selected in the demonstration area were 0.206 mg/L, 0.601 mg/L and 1.070 mg/L, and the ammonia nitrogen removal rates were 10.7%, 59.2% and 92.9%, respectively. With the increase of the initial ammonia nitrogen concentration, the ammonia nitrogen reduction rate increased by 82.2%. The initial total phosphorus concentrations in the three reservoirs were 0.05 mg/L, 0.06 mg/L and 0.11 mg/L, respectively, and the total phosphorus removal rates were 25.0%, 33.3% and 63.6%, respectively. With the increase of the initial total phosphorus concentration, the total phosphorus reduction rate increased by 38.6%. The reduction rate of bio-wax to cyanobacteria biomass in reservoirs were 45.5%-82.4%. The results of this study could provide scientific basis and technical support for the treatment of eutrophic water by bio-wax.