Device and method for treating petrochemical wastewater by using anaerobic hydrolysis acidification-A/O biological membrane method

Abstract

The invention discloses a device and a method for treating petrochemical wastewater by using an anaerobic hydrolytic acidification-A / O biological membrane method. The method comprises the following steps: controlling the aeration rate through introducing air into a hydrolytic acidification pool, so that the hydrolytic acidification is in an anaerobic hydrolytic acidification state; arranging a settling pool at the tail section of the hydrolytic acidification pool to carry out sludge backflow, enabling liquid supernatant to enter an A / O biological membrane reactor, filling a porous plastic ball carrier filled with polyurethane foam at the O section, enabling outlet water to enter a secondary settling pool so as to carry out sludge-water separation, refluxing the sludge to the O section and discharging the liquid supernatant. The device and the method have the benefits that the petrochemical wastewater is treated by using the method at a normal temperature, acid and base do not need to be added to regulate a pH value, the reduction of sulfate in the petrochemical wastewater can be effectively restrained, the generation of H2S is reduced, and the corrosion of metal equipment is reduced; a whole wastewater processing system is high in efficiency and reliable in operation and is particularly suitable for upgrading and reconstruction of an existing petrochemical wastewater treatment plant.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a device and method for treating petrochemical wastewater by microaerobic hydrolysis acidification-A / O biofilm method. Background technique [0002] There are many types of pollutants in petrochemical wastewater, and the water quality fluctuates greatly. Wastewater contains various refractory organic substances such as petroleum, benzene and benzene derivatives, which have a strong biological toxicity inhibition effect. It is difficult to meet the treatment requirements with a single treatment process, and a combination of several processes is generally used. [0003] Since the 1960s and 1970s, most domestic petrochemical plants have adopted the traditional or improved / old three sets of processes (oil separation-air flotation-activated sludge) for wastewater treatment. 5 The removal effect is better, generally can reach 70% and 90%. However, in recent ...

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Problems solved by technology

Hydrogen sulfide is a toxic and odorous gas that will corrode metal equipment for hydrolysis and acidification, and sulfide can easily cause a large number of filamentous sulfur bacteria in the aerobic biological treatment system to multiply, resulting in sludge swelling, which is difficult to recover and is easy to be exposed. Gas blowing off, affecting the surrounding environment

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