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cod elimination
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    Adjust the pH of drilling wastewater by high content H 2SO 4,then put the lime emulsion into it to make the pH be 9.0,the COD elimination rate will be 50%,and the suspended solids elimination rate will be above 80%.
    以浓H2SO4 调节废水的pH值至15,加入石灰乳中和使pH为9,可使CODcr的去除率达到50% ,悬浮物的去除率达到80% 。
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  cod elimination
Overall COD elimination is 84% (BOD, 92%) with biogas production 5-7 times the active volume of the upflow reactor per day.
      
As a principal step for COD elimination, upflow anaerobic sludge bed reactor performance was investigated at 30°C.
      
It had been found from the flocculation of disposed water with algae from Dianchi Lake that the transparency and COD elimination reach to 93.5% and 70.3%, respectively, with 15 mg/L PSOAMDA and at pH 6, vs.
      
The highest relative COD elimination levels were reached at the highest sludge loading rates investigated.
      


Be directed towards the character of high content of suspended solids and COD,lab work has been done on the possibility of acidizing and pre process of drilling waste water,also,its mechanism has been discussed.Adjust the pH of drilling wastewater by high content H 2SO 4,then put the lime emulsion into it to make the pH be 9.0,the COD elimination rate will be 50%,and the suspended solids elimination rate will be above...

Be directed towards the character of high content of suspended solids and COD,lab work has been done on the possibility of acidizing and pre process of drilling waste water,also,its mechanism has been discussed.Adjust the pH of drilling wastewater by high content H 2SO 4,then put the lime emulsion into it to make the pH be 9.0,the COD elimination rate will be 50%,and the suspended solids elimination rate will be above 80%.This process can be done in wastewater tank,proving the condition of using the coagulant for the next step.The main reson why the stability of the clay solids is they have hydrophilic group:-O -、-SO 3 - and COO -,but under the acid condition they become—OH,SO 3H,-COOH,then the ionic stability is broken,the clay particles subside.

针对钻井废水悬浮物和COD含量高的污染特征,对其酸化中和预处理的可行性进行了实验研究,并对其作用机理进行了探讨。以浓H2SO4 调节废水的pH值至15,加入石灰乳中和使pH为9,可使CODcr的去除率达到50% ,悬浮物的去除率达到80% 。预处理可在废水池内进行,给下一步利用装置进行混凝处理创造了条件。钻井废水中粘土颗粒稳定的主要原因是颗粒物连有强亲水基团:- O- 、- SO3- 和- COO- 。在酸性条件下,这些基团以- OH、- SO3H和-COOH形式存在,破坏了负离子稳定体系,使粘土颗粒得以沉降

 
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