1, Toxicity to microorganisms, aluminum has a certain stimulating effect on soil ammonification bacteria, nitrifying bacteria and denitrifying bacteria under the low mass fraction; when the mass fraction is high, it shows an inhibitory effect on the anaerobic bacteria And aerobic bacteria have an adverse effect on the activity, but the ability of microorganisms to repair themselves, at a certain concentration of culture for a period of time, microorganisms can produce resistance to aluminum toxicity; 2, animal and plant hazards, aluminum toxicity has become acidic Soil inhibition of plant growth, one of the main factors, which mainly endanger the plant's roots, thus affecting the crop nutrients and water absorption; aluminum ion concentrations above 0.5mg / L, some fish can be killed; 3, aluminum in To a certain extent, it is beneficial to the human body. It can relieve some of the toxic effects of lead on the human body. However, excessive intake of aluminum will be distributed in organs such as liver, stomach, spleen, brain and thyroid to form premature senility, dementia, anemia and some Bone disease, adult daily intake of aluminum should not exceed 35mg.