Sewage treatment system employing vertical flow biological trickling and horizontal flow multi-medium soil infiltration

Abstract

The invention belongs to the field of distributed treatment of sanitary sewage, and relates to a sewage treatment system with separate nitrification and denitrification phases. The sewage treatment system comprises a front-section vertical flow biological trickling system and a rear-section horizontal flow multi-medium soil infiltration system arranged below the front section, wherein the front section comprises a water distribution gravel layer, a natural zeolite packing layer, a drainage gravel layer and a drainage false floor. The rear section comprises a rear-section intake pond, an intake grating, a water distribution gravel layer, a natural zeolite infiltration layer, a soil template layer, a sealing soil layer, a drainage gravel layer, a drainage grating, a rear-section delivery tank and a delivery tank water outlet; the vertical interval of the front section and the rear-section intake pond is 30-50cm. Compared with the traditional two-stage multi-medium soil infiltration system, the rear section of the system adopts a horizontal flow method, the hydraulic retention time is effectively improved, the effluent is submerged by the horizontal flow, the anaerobic environment is improved, and total nitrogen removal is facilitated. Therefore, the system is ideal in overall treatment effect, not easy to block, and low in construction and operation costs.

Description

technical field [0001] The invention belongs to the field of distributed treatment of domestic sewage, and in particular relates to a two-phase and segmented sewage treatment system of nitrification and denitrification. Background technique [0002] In centralized sewage treatment, in the case of partial reuse of the treated water, the sewage is transported in the urban pipe network at least three times. This treatment method is accompanied by huge energy consumption, especially for small and medium-sized cities (towns) with scattered residences. , For the vast rural and remote areas, it is not an economical and applicable sewage treatment method. At present, scientists at home and abroad are actively advocating the idea of ​​decentralized sewage treatment, that is, on-site treatment and on-site reuse, to achieve water balance and water cycle. The concept of decentralized sewage treatment has been paid more and more attention by people. [0003] As an ideal decentralized s...

AI Technical Summary

Problems solved by technology

Especially in the case of artificial ventilation, the removal rate of TN decreased greatly, mainly because the denitrification process of nitrate nitrogen in the system was inhibited under aerobic conditions

In addition, some scholars have suggested that the insufficient hydraulic retention time of the system will also affect the nitrification and denitrification reactions of the system and reduce the removal rate of TN.

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