CN112062404A

CN112062404A - Continuous filtration type municipal sewage treatment method

Info

Publication number: CN112062404A
Application number: CN202010935070.1A
Authority: CN
Inventors: 陈建洪
Original assignee: Jiangsu Zhongzhi Xinyu Environmental Technology Co ltd
Current assignee: Jiangsu Zhongzhi Xinyu Environmental Technology Co ltd
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2020-12-11

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a continuous filtration type municipal sewage treatment method. The method comprises the following steps: a) passing municipal sewage through a coarse grid; b) the sewage flowing through the coarse grating passes through the fine grating; c) the sewage after garbage removal enters a regulating reservoir for stirring and pre-aeration treatment, and the treated sewage enters a primary continuous membrane filtration system for filtration; d) the A/O biochemical tank is used for carrying out organic matter removal, nitrogen removal and phosphorus removal on the sewage; e) the secondary continuous membrane filtration system filters the sewage; f) and finally, sending the sewage into a filtering tank for ultrasonic disinfection to obtain water reaching the discharge standard after disinfection. According to the invention, the continuous membrane filtration systems are arranged at the front and the back of the A/O biochemical pool, so that the solid-liquid separation efficiency is accelerated, and the operation investment cost is reduced. The adoption of ultrasonic wave sterilization avoids the generation of harmful byproducts, avoids the irreversible influence on human bodies and the environment and reduces the investment cost.

Description

Continuous filtration type municipal sewage treatment method

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a continuous filtration type municipal sewage treatment method.

Background

Municipal sewage belongs to water with relatively stable quality, extremely large water quantity, turbidity, depth, foul smell, alkalescence, high nitrogen and phosphorus content and no toxic substances generally, and is very suitable for the propagation of various microorganisms, so that the municipal sewage often contains a large amount of bacteria (including pathogenic bacteria) viruses and parasitic ova. Under the conditions that municipal sewage is large in water amount and water contains a large amount of silt and suspended solids, the previous process can select preliminary sedimentation of incoming water as pretreatment of a subsequent treatment process, but due to the large municipal sewage amount, if the pretreatment is carried out in a sedimentation mode, the occupied area of a sedimentation tank structure is very large, and the whole sewage treatment station is very unfavorable. If the precipitation efficiency is improved, a flocculating agent and a coagulant can be added to increase the precipitation speed, but the daily operation cost and the labor cost are obviously increased when the flocculating agent and the coagulant are added.

Disclosure of Invention

In order to solve the technical problems described in the background technology, the invention provides a continuous filtration type municipal sewage treatment method, and continuous membrane filtration systems are arranged at the front and the rear of an A/O biochemical pool, so that the solid-liquid separation efficiency is accelerated, and the operation input cost is reduced. The adoption of ultrasonic wave sterilization avoids the generation of harmful byproducts, avoids the irreversible influence on human bodies and the environment and reduces the investment cost.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a continuous filtration type municipal sewage treatment method comprises the following steps:

a) municipal sewage passes through a coarse grid to isolate large-volume garbage in the sewage;

b) the sewage flowing through the coarse grating passes through the fine grating to isolate the garbage with smaller volume;

c) the sewage after garbage removal enters an adjusting tank for stirring and pre-aeration treatment, the treated sewage enters a primary continuous membrane filtration system for filtration, and the filtered sewage is sent into an A/O biochemical tank;

d) the A/O biochemical tank is used for removing organic matters, nitrogen and phosphorus from the sewage, and then the sewage is sent to a secondary continuous membrane filtration system;

e) the secondary continuous membrane filtration system filters the sewage;

f) and finally, sending the sewage into a filtering tank for ultrasonic disinfection to obtain water reaching the discharge standard after disinfection.

Specifically, the first-stage continuous membrane filtration system and the second-stage continuous membrane filtration system are both filtration devices using inorganic ceramic membranes as filtration membrane tubes.

The invention has the beneficial effects that: the invention provides a continuous filtration type municipal sewage treatment method, wherein continuous membrane filtration systems are arranged at the front and the rear of an A/O biochemical tank, so that the solid-liquid separation efficiency is accelerated, and the operation input cost is reduced. The adoption of ultrasonic wave sterilization avoids the generation of harmful byproducts, avoids the irreversible influence on human bodies and the environment and reduces the investment cost.

Drawings

The invention is further described with reference to the following figures and examples.

FIG. 1 is a schematic diagram of the framework of the present invention;

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams illustrating only the basic structure of the invention in a schematic manner, and thus show only the constitution related to the invention.

Fig. 1 is a schematic diagram of the framework of the present invention.

As shown in the attached figure 1, a continuous filtration type municipal sewage treatment method comprises the following steps:

e) the secondary continuous membrane filtration system filters the sewage;

The first-stage continuous membrane filtration system and the second-stage continuous membrane filtration system are both filter devices with inorganic ceramic membranes as filter membrane tubes.

The A/O biochemical pool is used for treating wastewater by using an AO process, and A (Anaerobic) is an anaerobic section and is used for removing nitrogen and phosphorus; o (oxic) is an aerobic section for removing organic matter from water. Its advantages are that it not only degrades organic pollutant, but also has a certain function of removing nitrogen and phosphorus, and the anaerobic hydrolysis technology is used as the pretreatment of activated sludge, so the AO method is an improved activated sludge method.

The continuous membrane filtration system adopts the continuous membrane filtration system, can accelerate the solid-liquid separation efficiency and reduce the operation input cost, adopts an inorganic ceramic membrane in the continuous membrane filtration system, can select the membrane aperture according to the water quality requirement, has higher guarantee on the water quality of the effluent, adopts a circulating filtration mode, can carry out unattended filtration for a long time, has high filtration efficiency, the continuous membrane filtration system only discharges mud from the bottom of the front-end conical bottom circulating water tank, and the mud discharging operation is convenient and rapid.

The sterilization and disinfection mechanism of the ultrasonic wave is that the ultrasonic wave can perform ultrasonic cavitation in liquid to instantly generate hundreds of millions of cavitation micro bubbles, a plurality of cavitation bubbles are instantly generated and instantly exploded, meanwhile, the temperature of the liquid is continuously increased along with high temperature and high pressure, a hand is stretched into the liquid to feel pinprick, the cavitation generates strong mechanical shearing action, and the cell walls of microorganisms can be broken, so that the cell contents overflow out of the cell walls, and thus, certain components in the cells, such as DNA, RNA, amino acid, alkaloid, protein and the like can be extracted. The adoption of ultrasonic wave sterilization avoids the generation of harmful byproducts and the irreversible influence on human bodies and the environment. In addition, the municipal sewage has the characteristic of large water volume, if chlorine adding disinfection is continuously adopted, the cost of the medicament is obviously increased, and the ultrasonic disinfection mode does not need to add any substance into the water, so that the cost is superior to that of the chlorine adding disinfection, and other substances do not need to be added, so that the water quality is not affected by adopting the ultrasonic disinfection.

In light of the foregoing description of preferred embodiments according to the invention, many modifications and variations can be made by the worker skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A continuous filtration type municipal sewage treatment method is characterized in that: the method comprises the following steps:

e) the secondary continuous membrane filtration system filters the sewage;

2. The continuous filtration-type municipal sewage treatment method according to claim 1, wherein: the first-stage continuous membrane filtration system and the second-stage continuous membrane filtration system are both filter devices with inorganic ceramic membranes as filtration membrane tubes.