Study On The Treatment Of Acid Mine Drainage By Sulfate-reducing Bacteria

Sulfate-reducing bacteria are widely used to treat acid mine drainage with the advantages of high treatment efficiency and low operation cost.In this thesis,a low-cost and high-efficiency method for the treatment of acid mine found by simulating the acid mine drainage in the Yudong River Basin and using domestic sewage to provide carbon source for sulfate-reducing bacteria(SRB).The main conclusions are as follows:(1)The SRB in the test gave priority to desulphurvibrio.Studies on the influencing factors of SRB show that:the removal rate of SO₄^2-by SRB was proportional to inoculation amount;The higher the initial p H of raw water,the better the ability of SRB to remove SO₄^2-.The suitable p H range of SO₄^2-treatment by SRB was 5?8,and the removal rate of SO₄^2-was about 93.35%.When Fe²⁺?300mg/L,Fe²⁺inhibited SRB,While Cu²⁺,Zn²⁺and Mn²⁺inhibited SRB reduction,and the inhibition became more obvious with the increase of the concentration.(2)Using domestic sewage and laboratory simulated AMD,the optimal conditions of biological reaction stage were determined by single factor influence test:SRB inoculation amount was 15%,the volume ratio of domestic sewage and AMD was 1:1,and the hydraulic retention time was 20h.(30)After 7 days of continuous operation of the mixed precipitation-SRB combined reaction device,the mixed precipitation has a certain treatment effect on various pollutants.The removal rates of COD,SO₄^2-,Fe²⁺,Cu²⁺,Zn²⁺and Mn²⁺in the biological reaction stage were 54.98%,46.07%,73.51%,86.74%,84.87%and 9.13%,respectively;The pH,COD,Zn²⁺and Cu²⁺of the effluent after SRB treatment meet the discharge requirements of'Integrated Wastewater Discharge Standard'(GB8978-1996).