In recent years, flocculation technology has been widely used in the treatment of oily wastewater due to its adaptability, the ability to remove emulsified oils and dissolved oils, and some complex macromolecular organic substances that are difficult to biodegrade.
Flocculation purification treatment of Datong Zhengda oily wastewater
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In recent years, flocculation technology has been widely used in the treatment of oily wastewater due to its adaptability, the ability to remove emulsified oils and dissolved oils, and some complex macromolecular organic substances that are difficult to biodegrade. However, due to the complex composition of the oily wastewater in the oilfield, the flocculant selected for a particular treatment object cannot be theoretically predicted, and it must be screened through a large number of experiments.
Commonly used flocculants mainly include inorganic flocculants, organic flocculants and composite flocculants.
1. Inorganic polymer flocculants (such as polyaluminum chloride, polyferric sulfate, etc.) have lower treatment efficiency, less dosage and higher efficiency, but there are many disadvantages of flocculation and shortcomings. .
2. Organic polymer flocculants are difficult to be widely used due to their high price, and are mainly used as additives for other methods. The study found that the combination of inorganic flocculant and organic flocculant can significantly improve the treatment effect. This is because the cations in the organic flocculant act to neutralize and compress the electric double layer in the emulsified oil droplets in the wastewater, and promote the emulsified oil droplets to further break out, and the organic flocculant has a long molecular chain and can Colloidal particles formed by coacervation are bridged to form large, tough flocs, thereby improving flocculation performance.
3. The performance of the composite flocculant depends on the formation state of the floc and the amount of the substance. Therefore, improving the processing efficiency and reducing the cost by optimizing the composite flocculant has become an important research content in this field.
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