Study On The Mechanism Of Anaerobic Granular Sludge Treatment Of Sb In Water

Antimony is a metal substance widely used in production and life,but the accompanying antimony pollution is not optimistic.At the same time,its impact on human health cannot be ignored.Look for a low-consumption and effective treatment of antimony in water.The polluted process is of great significance.The research of using bacteria,algae,fungi and other biological methods to treat antimony-containing wastewater has achieved good results,but these microorganisms are mostly in a suspended state,and the separation effect from the water is poor.At the same time,a large amount of energy is consumed in the treatment process.The anaerobic granular sludge method has low energy consumption and high density of granular sludge in the treatment process,which is easy to settle and separate.Based on these advantages of the anaerobic granular sludge method,this paper starts with the cultivation of anaerobic granular sludge,discusses the interface characteristics of anaerobic granular sludge,and analyzes the effect of different types of anaerobic granular sludge and its constituent microorganisms on Sb（Ⅲ）)Adsorption mechanism,and discussed the reduction effect of anaerobic granular sludge microorganisms with different community structures on Sb（Ⅴ）.The main research contents are as follows:1.Use pond bottom sludge and remaining sewage plant sludge to quickly start the UASB device.After treatment,the dosage ratio of the bottom sludge of the lotus pond and the remaining sludge of the sewage treatment plant is 1:1,and the dosage is one third of the volume of UASB.A temperature control switch is used to control the temperature of the UASB reactor to keep it at 35±1°C.Sodium bicarbonate is used to control the p H of the reaction device so that the p H is controlled at about 7.It adopts self-prepared nutrient solution,uses glucose as carbon source,and COD adopts increasing form.After 65 days of culture,UASB was successfully started,and the COD removal rate was about 90%.2.The microbial probe malachite green was used to evaluate the interface characteristics of anaerobic granular sludge.The results show that p H has a great influence on the surface properties of anaerobic granular sludge.When the p H is lower than 2,the surface of anaerobic granular sludge will be protonated.The Redlich–Peterson adsorption isotherm can well describe the adsorption of malachite green by anaerobic granular sludge,indicating that the surface of anaerobic granular sludge is rich in functional groups,but the distribution may be uneven.The adsorption effect of anaerobic granular sludge on malachite green can be described by the pseudo-second-order kinetic equation and liquid film diffusion equation.It is inferred that the chemical action and the thickness of the liquid film on the surface of the anaerobic granular sludge may be due to the effect of anaerobic granular sludge on heavy metals.The rate-limiting step of adsorption.3.Use methods to inhibit methanogens and non-methanogens to domesticate anaerobic microorganisms.Cultivate anaerobic granular sludge dominated by methanogens and anaerobic granular sludge dominated by non-methanogenic bacteria.Then use different anaerobic granular sludge to adsorb Sb（Ⅲ）in the water,and explore the adsorption mechanism,the results show that:anaerobic granular sludge dominated by methanogens and anaerobic dominated by non-methanogenic bacteria The process of granular sludge adsorption of Sb（Ⅲ）in water can be described by Freundlich,Langmuir and pseudo-second-order kinetic models.The adsorption capacity of anaerobic granular sludge dominated by methanogens to Sb（Ⅲ）in water is greater than that of anaerobic granular sludge dominated by non-methanogenic bacteria.The EPS of granular sludge has almost no adsorption effect on Sb（Ⅲ）,while the core of granular sludge has good adsorption effect on Sb（Ⅲ）.Under different p H conditions,the microbes that make up the anaerobic granular sludge and Sb（Ⅲ）in the water have a competitive relationship on the two different adsorption methods of biomass binding and biological precipitation.The anaerobic granular sludge dominated by methanogens has a stronger binding effect with Sb（Ⅲ）biomass,which leads to the adsorption capacity of anaerobic granular sludge dominated by methanogens is greater than that of non-methanogenic sludge.Anaerobic granular sludge based on bacteria.The combination of anaerobic granular sludge microorganisms and Sb（Ⅲ）biomass is mainly attributed to the O-H in polysaccharides and the C=O and N-H functional groups in proteins.The main reason for the adsorption of Sb（Ⅲ）by microorganisms in anaerobic granular sludge is that Fe2+bio-iron accumulated in the anaerobic granular sludge reacts with Sb（Ⅲ）to form Fe OSb O₃ co-precipitate and deposit on the surface of anaerobic granular sludge.4.Use methods to inhibit methanogens and non-methanogens to domesticate anaerobic microorganisms.Cultivate anaerobic granular sludge dominated by methanogens and anaerobic granular sludge dominated by non-methanogenic bacteria.Combining with undomesticated anaerobic granular sludge,anaerobic microorganisms with different community structures were used to reduce Sb（Ⅴ）in the water.The results showed that the fermentation end product could not reduce Sb（Ⅴ）.Hydrogen-producing bacteria can reduce Sb（Ⅴ）and make it exist in a free state.Methanogens can reduce and solidify Sb（Ⅴ）,and the main methanogen is the genus metanthrix.