Study On Bioremediation Of Black And Smelly Water With Slow-release Oxygen

At present,the black and smelly river in the city pollutes people's living environment and affects people's health,so it is urgent to make the black and smelly water body get effective comprehensive treatment.The commonly used remediation technologies for polluted water mainly include physical,biological and chemical remediation technologies.Among them,bioremediation technology refers to the treatment technology that utilizes the characteristics of various organisms?including microorganisms,animals and plants?to degrade,absorb and transform the pollutants in the environment,so that the polluted environment can be effectively improved,which is widely used due to its environmentally friendly,ecological and energy-saving characteristics,it has a bright future.In this paper,the combination technology of immobilized bacillary and algal microsphere coupled with slow-release oxygen material is used in the practical application of black and smelly water.The main research results are as follows:?1?Using polyvinyl alcohol and sodium alginate as embedding materials,active carbon as adsorption additive,calcium chloride solution as cross-linking agent to embed bacteria and algae to prepare immobilized bacteria and algae microspheres.The results showed that the best preparation conditions of the immobilized microspheres were polyvinyl alcohol 10%,sodium alginate 0.5%and the mixture of bacteria and algae 20ml.The results showed that the removal rates of NH₃-N,TP and COD were 70.2%,75.8%and 72.6%respectively.?2?The immobilized microbeads were used to remove nitrogen and phosphorus from wastewater,and the effect of different factors on the treatment effect was explored.The results showed that the removal rate of ammonia nitrogen and total phosphorus was73.64%and 84.66%,respectively,when the volume ratio of immobilized bacteria was2:1,the removal rate of ammonia nitrogen and total phosphorus was the best,and the removal rate of ammonia nitrogen and total phosphorus was 43.32%and 84.66%respectively.The optimal temperature for nitrogen and phosphorus removal is 25?30?,and the optimal p H range is 6.5?7.5.The removal rate of ammonia nitrogen and total phosphorus in the composite system is 82.1%and 67.88%respectively in 48h,and the SS in the water is also reduced from 45to 11 mg/L.Compared with other single systems,the composite system in treating black smelly water has better effect.?3?The slow-release oxygen agent was prepared by using the mixture of percarbamide and potassium monopersulfate as oxygen source,biochar as stabilizer and polyvinylpyrrolidone as binder.The mixture of the new slow-release oxygen agent,Percarbamide and potassium bisulfate powder was put into the anaerobic water respectively.It was found that the ORC could slow down the oxygen release rate,release oxygen effectively for a long time,balance the p H of the water and avoid the large fluctuation of the p H of the water.The experimental results of artificial sewage show that the do of anaerobic water can be stabilized at 4 mg/L and p H value between6.3 and 6.8 at the density of 200 g/m²,the maximum removal rate of COD in water body is stable at about 60%,and the removal rate of total phosphorus in overlying water is more than 50%.?4?The immobilized microbeads coupled with slow-release oxygen materials were used to treat the actual black and smelly water.The results show that the combined technology can maintain DO and p H value of black and smelly water at about 3.5 mg/L and 6.5 respectively;The removal rates of COD,NH₃-N,TN and TP of overlying water are 84.6%,80.1%,59.9%and 69.7%respectively;The degradation rate of organic matter is 42.1%for the treatment effect of bottom mud,and the G value rises from 0.28g/kg·h to 1.29 g/kg·h during the experiment of 20 days.Therefore,the combination technology can effectively treat the actual black odorous water.