CN211770513U

CN211770513U - Improved laboratory scale sequencing batch reactor system

Info

Publication number: CN211770513U
Application number: CN201921855095.XU
Authority: CN
Inventors: 任曼; 赵林; 胡斯宇
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-10-27
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses the requirement provides a modified laboratory scale sequencing batch reactor system, is reforming transform to laboratory scale sequencing batch reactor system design. The improved SBR system comprises water inlet (waste water) (1), an online temperature detector (2), an external water chamber (3), a double aerator (4A/4B), an activated sludge discharge port (5), a bottom stirrer (6) for stirring sludge, an air (pressure) volume controller (7), an online pH sensor (8), a treated water discharge port (9), an online dissolved oxygen sensor (10), a heater (11) and an internal main sludge cabin (12). The biological removal of wastewater pollutants using activated sludge through alternating programmed phases or modes (influent, anoxic, aerobic, settling, drainage and stand-by) is accomplished more efficiently with the interaction of activated sludge microorganisms with the pollutants, with the further objective of simulating the distribution of coefficients of influent flow rates between the different phases in order to classify the overall cycle time.

Description

Improved laboratory scale sequencing batch reactor system

Technical Field

The utility model relates to a sewage treatment field, concretely relates to modified laboratory scale sequencing batch reactor system.

Background

At present, the water quality problem (particularly the water quality problem caused by the discharge of industrial wastewater) is increasingly serious, and in the case of the industrial wastewater, organic pollutants, nitrogen and phosphorus, metals, suspended solids and the like must be removed in the treatment process. Previous wastewater treatment systems have been simple in design and typically employ a tank or vessel to treat and remove solids from the wastewater by sedimentation. These early wastewater treatment systems did not contain aeration processes and often produced malodors. With the progress of treatment processes, these early wastewater treatment systems have evolved into systems that use wastewater treatment processes known as activated sludge wastewater treatment processes.

Activated sludge is produced by accumulating a residue rich in microorganisms in solids, separating the residue from the liquid in a solid/liquid separator, and then inoculating the residue into wastewater in an aeration tank. In conventional activated sludge wastewater treatment systems, the activated sludge solids concentration in the aeration basin is typically between 2000 and 5000 milligrams per liter.

The aerobic reaction in the aeration tank comprises three phenomena of absorption, adsorption and biological digestion. Adsorption occurs when contaminants are adsorbed into the cell walls of bacteria in the activated sludge. Adsorption, on the other hand, is a surface phenomenon that occurs when contaminants interact with the activated sludge surface, when the sludge surface interacts and adheres to the surface of bacterial molecules. Any of these three phenomena can result in the contaminants reacting with the sludge bacteria in the activated sludge. Biological digestion occurs when bacteria in the activated sludge consume waste constituents in the wastewater. After the material is absorbed or adsorbed, biological digestion occurs.

The conventional activated sludge process follows a predetermined time period, allowing bacteria to break down the contaminants by changing environmental conditions and the excess sludge to be returned to the aeration tank for reuse. However, conventional continuous flow wastewater treatment systems suffer from several disadvantages. In particular, they require a large amount of space and are therefore expensive to purchase, install and maintain. It also requires separate tanks or units to operate each process or stage. This system is not suitable for smaller residential and commercial applications.

Sequencing Batch Reactor (SBR) is an alternative activated sludge process for treating wastewater under intermittent and unsteady conditions, with equalization, aeration and clarification in the same tank. Thus, the unit processes of SBR and conventional activated sludge treatment systems are essentially the same, except that SBR performs such operations in a single tank under a timed control sequence. In fact, the SBR process enables biological phosphorus removal, nitrification, denitrification and BOD removal in one reactor. A typical SBR process usually comprises multiple SBRs in parallel; however, smaller businesses may require the use of one SBR in their wastewater treatment system. A typical SBR process has five basic operational steps/operations including, but not limited to, filling, reacting, settling, extracting and standby, which together comprise a complete SBR cycle. In the fill mode, a "batch" of wastewater flows into the SBR tank and is mixed with the activated sludge/mixture settled in the tank in the previous cycle. The time allotted for the fill mode is variable depending on various factors including the influent water flow rate and the degree and type of treatment required.

Although the SBR technique has wide application, it has limitations such as the need to address unwanted growth of filamentous fungi, slow decantation, the need to use a decanter system, the need for additional components, and the possibility of aerator blockage. It is therefore an object of the present invention to provide an improved laboratory sequencing batch reactor comprising a dual aerator system, a bottom agitator for mixing, an outer compartment conduit filled with water and a heater for maintaining the temperature of the inner compartment. A further object is to model the distribution of coefficients of the inflow between the different phases in order to classify the entire cycle time.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem of overcoming the defects of the prior art and providing an improved step-by-step sequencing batch reactor system for removing wastewater pollutants by using activated sludge microorganisms. The problems existing in the prior design are solved by reforming the step sequence intermittent reactor to a certain extent.

The utility model provides a its technical problem take following mode to realize: an improved laboratory scale sequencing batch reactor system, the step-wise SBR system removing toxic waste and nutrients from the wastewater, the improved system comprising a dual aerator, a bottom agitator, and an outer water chamber; the external water chamber is filled with clear water and is provided with a heater to maintain the required temperature and reduce the direct environmental impact; installing two aerators, wherein one aerator is arranged at the bottom, and the second aerator is fixed on the wall of the internal main sludge cabin; with the help of the air volume controller, double aerators can be arranged to provide the same air volume; the agitator is mounted at the bottom of the inner main sludge compartment.

Has the advantages that:

the utility model provides a series of extensive advantages, through reducing surplus sludge production, the high efficiency, the small-size, the hyperoxia is carried, and is economical and effective, does not have the influence of direct outdoor temperature.

Previous step SBR systems have removed toxic waste and nutrients from sewage. However, sometimes the sludge particles clog the aerator, reducing the system efficiency; secondly, the top agitator interferes with the free flow of sludge organics and contaminants; third, the outside temperature directly affects the operating conditions of the reactor, and it is difficult for previous systems to maintain the desired temperature.

The purpose of the dual aerators is to provide sufficient oxygen for the entire system, if one of the aerators fails, the other additional aerator will continue to fulfill the process requirements.

Bottom agitators for agitating sludge, in previous systems the agitator and agitator bar were mounted on the top, which would affect sludge particle movement by taking up too much space, and the improved system could be optimized by replacing the smaller agitator.

The heater is installed on the top of the external water chamber and used for maintaining the internal temperature, so that the direct influence of the indoor temperature is reduced, and the system operation is not influenced by seasons.

Drawings

FIG. 1 is a front view of the main structure of the improved step SBR system and the operating principle of the reactor, with the specific time of each stage or stage being determined within one cycle by alternating conditions including filling, reaction, anoxic, settling, evacuation and idle stages.

Figure 2 is a block diagram of the internal main sludge compartment and illustrates the modification employed.

Fig. 3 is a process of temperature maintenance of the outer water chamber using a heater.

Reference numerals: the system comprises a water inlet 1, an online temperature detector 2, an external water chamber 3, a double aerator 4A/4B, an activated sludge discharge port 5, a stirrer 6, an air (pressure) volume controller 7, a pH sensor 8, a treated water discharge port 9, an online dissolved oxygen sensor 10, a heater 11 and a main sludge cabin 12.

Detailed Description

The invention is described below by means of specific embodiments. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. Additionally, the embodiments should be considered illustrative, and not restrictive, of the scope of the invention, which is defined solely by the claims. The following detailed description of specific embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

The utility model relates to a modified laboratory scale sequencing batch reactor system, modified SBR system design include into water (waste water) 1, online thermodetector 2, outside hydroecium 3, two aerators 4A 4B, activated sludge discharge gate 5, be used for stirring the bottom agitator 6 of mud, air (pressure) volume controller 7, online pH sensor 8, processing water discharge port 9, dissolve oxygen sensor 10, heater 11, inside main sludge cabin 12 on line. The step SBR system removes toxic wastes and nutrients in sewage, and the improved system comprises a double aerator (4A/4B), a bottom stirrer 6 and an outer water chamber 3; the outer water chamber 3 is filled with fresh water and is equipped with a heater 11 to maintain the required temperature and reduce direct environmental impact; two aerators are arranged, wherein one aerator 4A at the bottom and the second aerator 4B are fixed on the wall of the internal main sludge cabin 12; with the help of the air volume controller 7, double aerators can be arranged to provide the same air volume; the agitator 6 is mounted at the bottom of the inner main sludge compartment 12. The purpose of the double aerators 4A/4B, which is to provide sufficient oxygen for the whole system, is that if one of the aerators fails, the other additional aerator will continue to fulfill the process requirements.

A bottom agitator 6 for agitating the sludge, in the previous systems the agitator and the agitator bar are mounted on top, which affects the movement of the sludge particles because it takes up too much space, and the improved system can be optimized by replacing the smaller agitator.

The heater 11 is installed at the top of the outer water chamber 3 for maintaining the inner temperature, reducing the direct influence of the indoor temperature, and securing the system operation from the influence of seasons.

Previous step SBR systems have removed toxic waste and nutrients from sewage. However, sometimes the sludge particles clog the aerator, reducing the system efficiency; secondly, the top agitator interferes with the free flow of sludge organics and contaminants; third, the outside temperature directly affects the operating conditions of the reactor, and it is difficult for previous systems to maintain the desired temperature. The improved system therefore comprises

dual aerators

4A, 4B, a bottom agitator 6 and an outer water chamber 3. The outer water chamber 3 is filled with fresh water and is equipped with a heater 11 to maintain the desired temperature and reduce direct environmental impact. Two aerators are installed, one of which, the bottom aerator 4A and the second aerator 4B, are fixed to the wall of the internal main sludge tank 12. With the help of the air volume controller 7, a double aerator can be provided to provide the same air volume. The agitator 6 is mounted at the bottom of the inner main sludge tank 12. in the previous systems, the agitator 6 was suspended from the top of the inner main sludge tank 12 by a large iron rod, whereas the latest systems did not require a large iron rod.

Example 1

FIG. 1 the main structure and function of STEP SBR system.

The modified laboratory Scale Batch Reactor (SBR) is a Biological Nutrient Removal (BNR) system that removes or utilizes important key sources of Natural Organic Matter (NOM) in wastewater by maintaining anoxic and anaerobic conditions and balancing the microbial population.

The improved system can simultaneously achieve maximum nitrification, denitrification, phosphorus and Chemical Oxygen Demand (COD) removal. The performance of the utility model is evaluated on a laboratory scale including a 5L capacity, and the system operation is controlled by a Programmable Logic Controller (PLC). It is operated according to determined cycle time, and the single period comprises water inflow, oxygen deficiency, aerobic, sedimentation, water drainage and standby at different stages.

(1) The reactor at the initial stage needs to be inoculated with 2L of activated sludge of a biological denitrification sewage treatment plant, 3L of synthetic wastewater is added, and the volume can be increased to 5L.

(2) The reactor was run for 4 cycles every 6 hours, and the time profile (water in, oxygen deficient, aerobic, settling, water draining and stand-by) within the cycle was determined.

(3) Dissolved Oxygen (DO)10, PH9 and temperature sensor 2 were installed on top of the inner main sludge chamber and the reactor was continuously monitored.

(4) The amount of aeration provided by the

aerators

4A and 4B, up to 0.2mg/L, and the amount of oxygen required are controlled by an instrumentation valve (7) to which an air pump is connected.

Example 2

FIG. 2: and (4) reforming an internal main sludge compartment. The compartment will be equipped with activated sludge and synthetic wastewater.

(1) An agitator 6 is installed at the bottom of the internal main sludge tank to perform the necessary mild mixing and to suppress sludge particle settling. The rotational speed of the agitator can be increased and decreased by a speed controller.

(2) Two aerators, one at the bottom 4A, are placed in the internal main sludge tank, and a second aerator is placed on the internal main sludge tank wall 4B. A single aerator may become clogged with sludge particles affecting the overall process, and thus a double aerator may reduce the chance of clogging.

Example 3

FIG. 3: structural representation of the external Water Chamber

(1) The inner main sludge compartment 12 is separated by an additional sheath covering the entire inner main sludge compartment.

(2) The space between the inner main sludge compartment and the outer water chamber 3 is filled with fresh water.

(3) A heater 11 is installed at the top of the outer water chamber 3 to maintain the temperature of the inner main sludge chamber.

(4) The design of the external water chamber 3 reduces the direct influence of the outdoor environment and is also beneficial to the operation of the reactor when the season changes.

Claims

1. An improved laboratory scale sequencing batch reactor system comprising a reactor body, characterized in that the improved system on the reactor body comprises a double aerator (4A/4B), a stirrer (6) and an external water chamber (3); the outer water chamber (3) is filled with clear water; two aerators are installed, one of which is a bottom aerator (4A) and the second aerator (4B) is fixed on the wall of the inner main sludge cabin (12).

2. An improved laboratory scale sequencing batch reactor system according to claim 1, wherein the double aerator (4A/4B) is replaceable.

3. An improved laboratory scale sequencing batch reactor system according to claim 1, wherein the agitator (6) is mounted at the bottom of the inner main sludge compartment (12).

4. An improved laboratory scale sequencing batch reactor system according to claim 1, wherein a heater (11) is installed on top of the outer water chamber (3).