| Drilling sewage is the sewage produced in the course of drilling. It concludes a great deal of deleterious substance, and can not eject directly. At present, although adopt chemical coagulation sedimentation abroadly to dispose drilling sewage, owing to multiplicate reason, however the effect is difficult to appease the request of environment. So go deep into research the technique of disposing the drilling sewage is very important to control environmental pollute in oil or gas fields.Detailedly expatiates the source, constitute, pollutant characteristic and the present condition of disposing drilling sewage. And aim at the concrete waste, adopt the project of the pretreatment and biological treatment, and focally study the feasibility and affect factor of biological treatment.In the pretreatment experiment, we select coagulation sedimentation to dispose the drilling sewage, the COD declines from 3781mg/L to 272mg/L, the rate is upwards 90%. It lowers following handle' s difficulty. Use the oxygen dissolved instrument to measure the biological breath oxygen consumption of the organic pollutant and determine the biological treatment. In the biological treatment experiment, select inflation pool to study the fracturing liquid experiment, in the experiment, respectively investigate the aerated, pH value, temperature to the influence of the COD declining, recommend the superior project of biological treatment drilling sewage. In the course of experiment, we observe the microorganism with the microscope, see a great deal of bacteria, protozoan and metazoan. On the base of the experiment, through analyzing a large of experiment data, deduce the COD degradation dynamics on the steady condition, define the dynamics parameter k.The experiment result expresses, after pretreatment and biological method, drilling sewage can attain a class standard of national waste synthetical discharge.At last, on the base of experiment, design the disposal flow in drilling locale. |
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