Experimental Study On Emergncy Treatment Of Water After Beryllium Pollution Accident

Beryllium is listed as a type of pollutant in the"Integrated wastewater discharge standard",and its emission limit is"0.002mg/L"in"Standards for drinking water quality",which is highly toxic to humans.Sudden beryllium pollution incidents in water bodies are generally caused by water-soluble beryllium compounds,which mainly come from coal mine combustion and other industrial discharges using beryllium.Once they occur,it will have a significant impact on the ecological environment and the health of people.Conventional inorganic coagulants such as aluminum and iron salts,inorganic polymer coagulants such as polyaluminum and polyiron,insoluble solid adsorption materials with high specific surface area such as activated carbon and diatomaceous earth are candidate materials that can be used to remove Be²⁺in water.This paper takes Be²⁺as the research object,and systematic investigation of the effects of materials such as ferric chloride,polyferric sulfate,polyaluminum sulfate,polyaluminum chloride,montmorillonite powder,activated carbon powder,kaolin zeolite powder and diatomite powder on the emergency treatment of beryllium pollution in water bodies,screen out the types,dosages and process parameters of emergency treatment materials for sudden beryllium pollution in water bodies under different processes,and the best parameters and beryllium-containing flocs and beryllium-containing adsorption materials'stability under different combination processes are studied.When the coagulation precipitation process and the adsorption process are separately used to treat beryllium-containing wastewater,polyaluminum chloride and montmorillonite powder have the best removal effect on Be²⁺.The effects of different factors such as pH,dosage of treatment materials,reaction time and temperature on the removal effect were tested.The pH has the greatest effect on coagulation or adsorption of beryllium removal,and the reaction temperature has the least effect on adsorption.Taking comprehensive consideration of economic cost and treatment effect,polyaluminum sulfate is the best medicament for removing beryllium by coagulation,kaolin zeolite powder is the best material for removing beryllium.At normal temperature?25??,treat 0.50mg/L beryllium-containing wastewater,adjust the initial pH of the solution to 8,add 0.15g/L of polyaluminum sulfate,and react for 6minutes The pH of the effluent was adjusted to 7 and the solution was allowed to settle for 10 minutes.The removal rate of Be²⁺was 98.01%;At normal temperature?25�C?,0.50mg/L beryllium-containing waste-water is treated.The initial pH of the solution is adjusted to 8.Add 2g/L kaolin zeolite powder.The removal rate of Be²⁺reached 92.36%.The stability of beryllium-containing polyaluminum sulfate floc and beryllium-containing kaolin zeolite powder are greatly affected by pH and are less affected by water flow disturbance.Although a single coagulation and adsorption process has a significant effect on the removal of beryllium ions,the concentration of Be²⁺in the effluent has not reached the integrated wastewater discharge standard.Four processes using the best materials polyaluminum sulfate and kaolin zeolite powder,such as the second coagulation process,the first coagulation and then the adsorption process,the first adsorption and then the coagulation process,and the simultaneous coagulation and adsorption process all increase the removal rate of Be²⁺.Among them,the first coagulation after the adsorption process has the best removal effect on Be²⁺.At normal temperature?25??,treat 0.50mg/L beryllium-containing wastewater,Add 2g/L kaolin zeolite powder first,perform adsorption treatment under the optimal reaction conditions,take out the supernatant,then add 0.075g/L polyaluminum sulfate,and coagulate under the optimal reaction conditions.Finally,the remaining Be²⁺concentration is 0.0044mg/L,which reaches the"Integrated wastewater discharge standard".It can be used as an emergency treatment process for sudden beryllium pollution in water bodies.