Sewage treatment method for inhibiting activated sludge bulking

Abstract

The invention discloses a sewage treatment method for inhibiting activated sludge bulking. An adopted sewage treatment system comprises a biological tank, effluent of the biological tank is communicated to a water distribution well, and the water distribution well averagely distributes the effluent of the biological tank into two secondary sedimentation tanks; sludge in the secondary sedimentationtank is introduced into a residual sludge tank in the residual sludge pump room, and a residual sludge pump set and an outer reflux pump set are mounted in the residual sludge tank; a composite agentadding device is arranged beside a biological tank, a sodium hypochlorite agent adding device is arranged beside a residual sludge pump room, and the method for inhibiting activated sludge bulking comprises the steps of adjusting the sludge concentration, adjusting the water inlet amount, inhibiting microthrix sludge bulking and inhibiting nocardia sludge bulking. Sludge bulking caused by microthrix parvicella and nocardia in the sewage treatment process can be effectively inhibited, the occurrence rate of sludge bulking is reduced, the influence of sludge bulking on the sewage treatment efficiency and effluent quality is avoided, and the normal operation of a sewage treatment biological treatment system is ensured.

Description

technical field

[0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment method for inhibiting the expansion of activated sludge. Background technique

[0002] Sludge bulking refers to the phenomenon that the sludge structure is extremely loose, the volume increases, floats up, and it is difficult to settle and separate, which affects the quality of effluent water. Microthrix swelling is the main cause of activated sludge swelling in northern sewage treatment plants in winter. Microthrix is ​​a kind of actinomycetes, the length can reach 200μm, the mycelium is curved, and can hover in the whole mycolloid. When a large number of Microthrix multiply, it will cause the sludge to expand. Nocardia bulking is the main cause of activated sludge bulking in sewage treatment plants in summer. Nocardia is mostly bacillus, the length is generally 3-4μm, and the hyphae are dendritic. When the water temperature is high in summer, the ...

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