CZ5741U1 - Air system of sewage treatment plant with preliminary denitrification and internal recirculation of sludge - Google Patents

Description

Air system of sewage treatment plant with predenitrification and internal sludge recirculation

Technical field

The technical solution relates to the air system of a container wastewater treatment plant with predenitrification and internal sludge recirculation, and in particular with ultimate aerobic sludge stabilization.

BACKGROUND OF THE INVENTION

Currently, container wastewater treatment plants are often used, where all or at least most of the technological equipment is located in a container. The advantage is the possibility of installation

J on site and minimum footprint. However, the possibility of on-site assembly requires the simplest possible construction and the minimization of the number of structural elements so that assembly and, of course, the attendant does not require the presence of highly skilled personnel. However, high efficiency of the technological process and minimum failure rate of the structural elements must be maintained. Combining these requirements creates a task whose solution currently seems to be quite problematic.

The essence of the technical solution

To a large extent, the air system of the container wastewater treatment plant according to the invention consists of at least a pre-nitrifying anoxic column, an oxidation chamber and a settling tank where the anoxic column is equipped with a stirrer, the oxidizing chamber is equipped with aeration elements and the settling tank is equipped with a sludge discharge pump to the anoxic column and a second sludge discharge pump. The principle consists in that the air system consists of at least one blower to which are connected the medium bubble air stirrers of the anoxic column, the diaphragm fine bubble aeration elements of the oxidation space, the return air pump and the second air pump of the settling tank.

j The aeration element of the connected sludge pit can be connected to the blower.

The blowers may be located in the oxidation space in the activation mixture.

The advantage of the aeration system according to the technical solution is to reduce the structural components, since all drives are provided by a single source, namely a single or multiple blower. In addition, the air drive is very reliable, energy-efficient and low-noise.

Overview of the drawings

The air system of the sewage treatment plant is described in more detail with reference to the accompanying drawing, in which Fig. 1 shows a schematic arrangement of the plant with the system applied in vertical section and Fig. 2 the same arrangement in plan view.

-1GB 5741 Ul

Example of technical solution

The container wastewater treatment plant with an air system according to the invention has an anoxic column 1 with a medium bubble air stirrer 41 and an oxidation space 2 in which the vertical settling tank 3 is embedded is fitted with membrane aeration elements 42 over the entire surface. 43 for discharging sludge to the anoxic column 1 and a second air pump 44 for discharging the sludge into a sludge pit which is not part of the container. The air sources are blowers 4 in a watertight design, which are immersed directly in the activation mixture in the end part of the oxidation space 2. Blowers 4 are connected with air stirrers 41 of anoxic column 1 and fine bubble membrane aeration elements 42 of oxidation space 2. A return air pump 43 terminating in the anoxic column 1 and a second air pump 44 terminating in the settling tank 2 are connected. ^For final aerobic sludge stabilization in an additional sludge pit (not shown), the mixing and aeration element of the sludge pit is connected to the blower 4.

The blowers 2 may be located in the blower outside the container body. This is particularly advantageous in cases where the capacity of the treatment plant is multiplied by the parallel arrangement of several containers. The blowers 4 may then be common to all containers.

The waste water after treatment by the grinding pumps or via the coarse pre-treatment flows into the anoxic column 1, where it is activated and mixed by a blower-driven air stirrer 41. From there it flows as an activation mixture into the oxidation space 2. From there the mixture goes to the settling tank 3, from whose bottom cone the settled sludge is drawn by a return air pump 32 to the anoxic column 1 or as sludge excess into the sludge pit, where it is further aerated and stabilized. The purified water is withdrawn from the settling tank 2 by a drainage trough 34 with normal walls. Pumps 43. 44 and the mixing and aerating element of the sump are also driven by a blower 4.

Industrial applicability

The container wastewater treatment plant according to the technical solution can be industrially produced and used especially for sewage wastewater treatment.

Claims (3)

PROTECTION REQUIREMENTS 1. An air system of a wastewater treatment plant with pre-nitrification and internal sludge recirculation with at least a pre-nitrification anoxic column, an oxidation space and a settling tank, the anoxic column being equipped with a stirrer, the oxidizing chamber fitted with aeration elements and anoxic column and a second pump for sludge evacuation into the sump, 5741 U1, characterized in that it consists of at least one fan (4) to which the medium bubble air stirrers (41) of the anoxic column (1) are connected, further diaphragm fine-bubble aeration elements (42) of the oxidation space (2), return air a pump (43) and a second air pump (44) of the settling tank (3). The air system of a container wastewater treatment plant according to claim 1, characterized in that the aeration element of the connected sludge pit is connected to the blower. The air system of a container wastewater treatment plant according to claim 1, characterized in that the blower is located in the oxidation space (2) in the activation mixture.