Composite coagulant and method for refined oil storage oil-containing sewage treatment

Abstract

The present invention discloses a composite coagulant for refined oil storage oil-containing sewage treatment. The composite coagulant comprises an agent A and an agent B, wherein the agent A is prepared from the following raw materials by weight: 10-40% of Ca(OH)2, 20-50% of sodium carbonate, 15-50% of diatomaceous earth, and 2-20% of powder active carbon, and the agent A is prepared from the following raw materials by weight: 10-30% of magnesium sulfate, 30-60% of ferrous sulfate, and 30-60% of polyferric sulfate. The present invention further discloses a method for refined oil storage oil-containing sewage treatment, wherein the method comprises: 1, deoiling refined oil storage oil-containing sewage, and 2, adding the agent A to the deoiled refined oil storage oil-containing sewage, stirring, adding the agent B after uniformly stirring, and carrying out a precipitation reaction. According to the present invention, the water-soluble organic matters incapable of being removed by the conventional coagulants can be effectively removed, and the oil storage sewage treatment requirements with different pollutant concentrations can be met.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a composite coagulant and a method for treating oily sewage in a product oil depot. Background technique [0002] The oily sewage of the refined oil depot mainly comes from the initial rainwater in the reservoir area, ground flushing water, oil tank cutting water, tank cleaning operation drainage, loading and unloading operation drainage, etc. The particularity of the water quality of oily sewage in refined oil depots is that in addition to petroleum, there are a large amount of gasoline and diesel additives such as methyl tert-butyl ether (MTBE) soluble in water. Process treatment of oily sewage, the coagulation and air flotation process in this process can remove dispersed oil and emulsified oil in sewage by adding conventional coagulants such as polyaluminum chloride (PAC) and polyacrylamide (PAM) combined with air flotation devices Colloidal substances, such as me...

AI Technical Summary

Problems solved by technology

The particularity of the water quality of oily sewage in refined oil depots is that in addition to petroleum, there are a large amount of gasoline and diesel additives such as methyl tert-butyl ether (MTBE) soluble in water. Process treatment of oily sewage, the coagulation and air flotation process in this process can remove dispersed oil and emulsified oil in sewage by adding conventional coagulants such as polyaluminum chloride (PAC) and polyacrylamide (PAM) combined with air flotation devices Colloidal substances, such as methyl tert-butyl ether (MTBE) and other gasoline and diesel additives soluble in water, have no removal effect, resulting in serious excess of organic matter (COD) in sewage

[0003] Biochemical method is one of the effective means to remove organic COD in sewage. However, due to the intermittent discharge of oily sewage from oil depots, large fluctuations in water quality and water volume, and poor biodegradability of sewage, the biochemical treatment units of most enterprises cannot operate stably.