阅读说明：本技术 一种沉钒废水处理系统、方法及用途 (Vanadium precipitation wastewater treatment system, method and application ) 是由 张宝刚 李敏 于 2019-12-02 设计创作，主要内容包括：本发明涉及废水处理技术领域,尤其涉及沉钒废水处理系统、方法及用途。所述沉钒废水处理系统包括实验反应子系统,所述实验反应子系统包括串联设置的一级反应器和二级反应器；其中,所述一级反应器的侧壁上设置有入水口；所述一级反应器内部为厌氧环境,并设置有多根纤维膜管；所述一级反应器中各根纤维膜管的侧壁由生物膜构成,且接种有厌氧钒还原污泥；所述一级反应器中各根纤维膜管的一端封闭,另一端通过导管和所述二级反应器的入水口连通；所述二级反应器内部为厌氧环境,并设置有多根纤维模管；所述二级反应器中各根纤维膜管的侧壁由生物膜构成,且接种有厌氧氨氧化污泥。(The invention relates to the technical field of wastewater treatment, in particular to a vanadium precipitation wastewater treatment system, a vanadium precipitation wastewater treatment method and application. The vanadium precipitation wastewater treatment system comprises an experimental reaction subsystem, wherein the experimental reaction subsystem comprises a primary reactor and a secondary reactor which are arranged in series; wherein the side wall of the primary reactor is provided with a water inlet; the interior of the primary reactor is an anaerobic environment and is provided with a plurality of fiber membrane tubes; the side wall of each fiber membrane tube in the primary reactor is formed by a biological membrane and inoculated with anaerobic vanadium reduction sludge; one end of each fiber membrane tube in the primary reactor is closed, and the other end of each fiber membrane tube is communicated with a water inlet of the secondary reactor through a guide tube; the interior of the secondary reactor is an anaerobic environment and is provided with a plurality of fiber mould pipes; the side wall of each fiber membrane tube in the secondary reactor is composed of a biological membrane and is inoculated with anaerobic ammonia oxidation sludge.)

1. The vanadium precipitation wastewater treatment system is characterized by comprising an experimental reaction subsystem, wherein the experimental reaction subsystem comprises a primary reactor and a secondary reactor which are connected in series; wherein the content of the first and second substances,

a water inlet is formed in the side wall of the primary reactor; the interior of the primary reactor is an anaerobic environment and is provided with a plurality of fiber membrane tubes; the side wall of each fiber membrane tube in the primary reactor is formed by a biological membrane and inoculated with anaerobic vanadium reduction sludge; one end of each fiber membrane tube in the primary reactor is closed, and the other end of each fiber membrane tube is communicated with a water inlet of the secondary reactor through a guide tube;

the interior of the secondary reactor is an anaerobic environment and is provided with a plurality of fiber mould pipes; the side wall of each fiber membrane tube in the secondary reactor is composed of a biological membrane and is inoculated with anaerobic ammonia oxidation sludge; one end of each fiber membrane tube in the secondary reactor is closed, and the other end of each fiber membrane tube is communicated with the outside through a guide tube so as to discharge treated wastewater;

when the vanadium precipitation wastewater treatment system works, vanadium precipitation wastewater enters the primary reactor through a water inlet of the primary reactor, reacts with the anaerobic vanadium reduction sludge, and permeates into fiber membrane tubes in the primary reactor through a biological membrane to obtain intermediate treatment liquid;

and the intermediate treatment liquid flows into the secondary reactor, and after the intermediate treatment liquid reacts with the anaerobic ammonia oxidation sludge, the intermediate treatment liquid permeates into the fiber membrane tube in the secondary reactor through a biological membrane to obtain final treatment liquid.

2. The wastewater treatment system for precipitating vanadium according to claim 1, wherein the primary reactor and the secondary reactor are both protected from light.

3. The vanadium precipitation wastewater treatment system as claimed in claim 1, wherein the volumes of the primary reactor and the secondary reactor are 60-70mL, the primary reactor and the secondary reactor comprise 30-35 fiber membrane tubes, the effective length of any one fiber membrane tube in the primary reactor and the secondary reactor is 18-22cm, and the effective filtration area is 210-230cm²。

4. The wastewater treatment system for precipitating vanadium according to claim 1, wherein the hydraulic retention time of the wastewater treatment system for precipitating vanadium is 20-40 h.

5. The vanadia wastewater treatment system of claim 1, comprising two peristaltic pumps disposed on an inlet side of the primary reactor and an outlet side of the secondary reactor, respectively.

6. The vanadium precipitation wastewater treatment system according to claim 1, comprising a sampling reaction subsystem, wherein the sampling reaction subsystem and the experimental reaction subsystem are connected in parallel; the sampling reaction subsystem comprises a first reactor and a second reactor which are arranged in series; wherein the content of the first and second substances,

a water inlet is formed in the side wall of the first reactor; the interior of the first reactor is an anaerobic environment and is provided with a plurality of fiber membrane tubes; the side wall of each fiber membrane tube in the first reactor is formed by a biological membrane, and anaerobic vanadium reduction sludge is inoculated; one end of each fiber membrane tube in the first reactor is closed, and the other end of each fiber membrane tube is communicated with a water inlet of the second reactor through a guide tube;

the interior of the second reactor is an anaerobic environment and is provided with a plurality of fiber mould pipes; the side wall of each fiber membrane tube in the second reactor is composed of a biological membrane and is inoculated with anaerobic ammonia oxidation sludge; one end of each fiber membrane tube in the second reactor is closed, and the other end of each fiber membrane tube is communicated with the outside through a guide tube so as to discharge treated wastewater;

when the vanadium precipitation wastewater treatment system works, vanadium precipitation wastewater enters the first reactor through a water inlet of the first reactor, reacts with the anaerobic vanadium reduction sludge, and permeates into a fiber membrane tube in the first reactor through a biological membrane to obtain intermediate treatment liquid;

and the intermediate treatment liquid flows into the second reactor, reacts with the anaerobic ammonium oxidation sludge, and permeates into the fiber membrane tube in the second reactor through a biological membrane to obtain final treatment liquid.

7. A method for treating vanadium precipitation wastewater by using the vanadium precipitation wastewater system of any one of claims 1 to 6, which is characterized by comprising the following steps:

leading the vanadium precipitation wastewater into a primary reactor, so that the anaerobic vanadium reduction sludge in the primary reactor can reduce vanadium ions in the vanadium precipitation wastewater to remove vanadium in the vanadium precipitation wastewater;

in the primary reactor, infiltrating vanadium precipitation wastewater into a fiber membrane tube of the primary reactor through a biological membrane to obtain an intermediate treatment solution;

the intermediate treatment liquid flows into the secondary reactor through a conduit between the fiber membrane tube of the primary reactor and the secondary reactor so that ammonia in the intermediate treatment liquid is removed from the anaerobic ammonia oxidation sludge in the secondary reactor;

in the secondary reactor, the intermediate processor permeates into a fiber membrane tube of the secondary reactor through a biological membrane to obtain final treatment liquid.

8. Use of the vanadium precipitation wastewater system according to any one of claims 1 to 6 for removing vanadium and ammonia nitrogen from vanadium precipitation wastewater.

9. Use according to claim 8, characterized in that it comprises removing at least 90% of the vanadium ions from a vanadium wastewater with a vanadium ion content of 10-50 mg/L.

10. The use according to claim 8, wherein the use comprises removing at least 95% of ammonia nitrogen in vanadium wastewater with ammonia nitrogen content of 10-50 mg/L.

Technical Field

One or more embodiments of the present description relate to the field of wastewater treatment technology, and in particular, to a vanadium precipitation wastewater treatment system, method and use.

Background

Vanadium is a metal with a wide range of applications and is widely used in industry due to its excellent physicochemical properties. The global increase in vanadium demand has facilitated intensive mining and smelting activities. The vanadium slag is used as the main raw material of vanadium, and the main vanadium extraction technology is a sodium salt roasting method. In this process, vanadium is leached with hot water, followed by precipitation of vanadium as ammonium polyvanadate under acidic conditions by addition of ammonium sulfate. The residual filtrate is called vanadium precipitation wastewater. The vanadium precipitation wastewater usually contains a large amount of vanadium, ammonia nitrogen and a part of sulfate, and has large discharge amount and great toxicity. This is considered a risk to human and environmental health due to its hazardousness, persistence and tendency to bioaccumulate.

At present, the common treatment methods for vanadium precipitation wastewater are a chemical method and a biological method. The chemical method has the advantages of high efficiency, low operation cost, short repair period and the like. However, if two or more pollutants are present in the wastewater, the chemical remediation technology can cause another pollution risk when one pollutant is treated, and thus secondary pollution is caused. In addition, the redox agent itself may cause certain harm to the health and safety of animals and plants. Biological processes are increasingly considered promising strategies for treating vanadium precipitation wastewater due to their simplicity, sustainability and low cost. Many researchers have the function of directly reducing V (V) to V (IV) by pure bacteria such as Pseudomonas, Shewanella oneidensis and Methanotherobacterium. However, the method for removing V (V) by using a pure bacteria method has a relatively strict requirement on the environment and is not suitable for vanadium precipitation wastewater with relatively complex components, so the pure bacteria method has certain limitation.

Disclosure of Invention

One or more embodiments of the present disclosure describe a vanadium precipitation waste treatment system and method, which can efficiently remove vanadium and ammonia nitrogen in vanadium precipitation waste water by using mixed bacteria with high microbial diversity, strong adaptability and strong self-evolution capability in bioactive sludge.

According to a first aspect, a vanadium precipitation wastewater treatment system is provided, and comprises an experimental reaction subsystem, wherein the experimental reaction subsystem comprises a primary reactor and a secondary reactor which are arranged in series; wherein the content of the first and second substances,

a water inlet is formed in the side wall of the primary reactor; the interior of the primary reactor is an anaerobic environment and is provided with a plurality of fiber membrane tubes; the side wall of each fiber membrane tube in the primary reactor is formed by a biological membrane and inoculated with anaerobic vanadium reduction sludge; one end of each fiber membrane tube in the primary reactor is closed, and the other end of each fiber membrane tube is communicated with a water inlet of the secondary reactor through a guide tube;

the interior of the secondary reactor is an anaerobic environment and is provided with a plurality of fiber mould pipes; the side wall of each fiber membrane tube in the secondary reactor is composed of a biological membrane and is inoculated with anaerobic ammonia oxidation sludge; one end of each fiber membrane tube in the secondary reactor is closed, and the other end of each fiber membrane tube is communicated with the outside through a guide tube so as to discharge treated wastewater;

when the vanadium precipitation wastewater treatment system works, vanadium precipitation wastewater enters the primary reactor through a water inlet of the primary reactor, reacts with the anaerobic vanadium reduction sludge, and permeates into fiber membrane tubes in the primary reactor through a biological membrane to obtain intermediate treatment liquid;

and the intermediate treatment liquid flows into the secondary reactor, reacts with the anaerobic ammonium oxidation sludge, and permeates into the fiber membrane tube in the secondary reactor through a biological membrane to obtain final treatment liquid.

In some embodiments, the primary reactor and the secondary reactor are both protected from light.

In some embodiments, the volumes of the primary reactor and the secondary reactor are 60-70mL, the primary reactor and the secondary reactor each comprise 30-35 fiber membrane tubes, the effective length of any one fiber membrane tube in the primary reactor and the secondary reactor is 18-22cm, and the effective filtration area is 210-230cm²。

In some embodiments, the vanadium precipitation wastewater treatment system is operated for a hydraulic retention time of 20-40 h.

In some embodiments, the vanadia wastewater treatment system comprises two peristaltic pumps disposed on an inlet side of the primary reactor and an outlet side of the secondary reactor, respectively.

In some embodiments, the vanadium precipitation wastewater treatment system comprises a sampling reaction subsystem, and the sampling reaction subsystem and the experimental reaction subsystem are connected in parallel; the sampling reaction subsystem comprises a first reactor and a second reactor which are arranged in series; wherein the content of the first and second substances,

a water inlet is formed in the side wall of the first reactor; the interior of the first reactor is an anaerobic environment and is provided with a plurality of fiber membrane tubes; the side wall of each fiber membrane tube in the first reactor is formed by a biological membrane, and anaerobic vanadium reduction sludge is inoculated; one end of each fiber membrane tube in the first reactor is closed, and the other end of each fiber membrane tube is communicated with a water inlet of the second reactor through a guide tube;

the interior of the second reactor is an anaerobic environment and is provided with a plurality of fiber mould pipes; the side wall of each fiber membrane tube in the second reactor is composed of a biological membrane and is inoculated with anaerobic ammonia oxidation sludge; one end of each fiber membrane tube in the second reactor is closed, and the other end of each fiber membrane tube is communicated with the outside through a guide tube so as to discharge treated wastewater;

when the vanadium precipitation wastewater treatment system works, vanadium precipitation wastewater enters the first reactor through a water inlet of the first reactor, reacts with the anaerobic vanadium reduction sludge, and permeates into a fiber membrane tube in the first reactor through a biological membrane to obtain intermediate treatment liquid;

and the intermediate treatment liquid flows into the second reactor, reacts with the anaerobic ammonium oxidation sludge, and permeates into the fiber membrane tube in the second reactor through a biological membrane to obtain final treatment liquid.

In a second aspect, a method for treating vanadium precipitation wastewater by using the vanadium precipitation wastewater system in the first aspect is provided, which comprises the following steps:

leading the vanadium precipitation wastewater into a primary reactor, so that the anaerobic vanadium reduction sludge in the primary reactor can reduce vanadium ions in the vanadium precipitation wastewater to remove vanadium in the vanadium precipitation wastewater;

in the primary reactor, infiltrating vanadium precipitation wastewater into a fiber membrane tube of the primary reactor through a biological membrane to obtain an intermediate treatment solution;

the intermediate treatment liquid flows into the secondary reactor through a conduit between the fiber membrane tube of the primary reactor and the secondary reactor so that ammonia in the intermediate treatment liquid is removed from the anaerobic ammonia oxidation sludge in the secondary reactor;

in the secondary reactor, the intermediate processor permeates into a fiber membrane tube of the secondary reactor through a biological membrane to obtain final treatment liquid.

In a third aspect, the application of the vanadium precipitation wastewater system in the first aspect in removing vanadium and ammonia nitrogen in vanadium precipitation wastewater is provided.

In some embodiments, the use comprises removing at least 90% of the vanadium ions from a vanadium wastewater having a vanadium ion content of 10-50 mg/L.

In some embodiments, the use comprises removing at least 95% of ammonia nitrogen in vanadium wastewater with ammonia nitrogen content of 10-50 mg/L.

The vanadium precipitation wastewater treatment system, the vanadium precipitation wastewater treatment method and the vanadium precipitation wastewater treatment application provided by the embodiment of the specification have the following advantages: the removal rate of V (V) in the vanadium precipitation wastewater reaches more than 90 percent; NH (NH)₄ ⁺Harmful by-product NO of-N₃ ^--N and NO₂ ^-N is hardly produced. The total nitrogen removal rate is higher and is more than 95 percent. Tetravalent vanadium (as VO) as a reduction product of V (V)₂Form present) is precipitated in the reactor and a part of the Sulphate (SO) is removed simultaneously₄ ^2-). For the actual vanadium precipitation wastewater, effective removal of vanadium and ammonia nitrogen in the wastewater can be realized only by adjusting pH and supplementing an organic carbon source, and partial sulfate can be removed.

Drawings

FIG. 1 is a schematic structural diagram of a vanadium precipitation wastewater treatment system provided by an embodiment of the invention;

FIG. 2 is a diagram showing the treatment effect of the vanadium precipitation wastewater treatment system on V (V) according to the embodiment of the present invention;

FIG. 3 is a diagram showing the treatment effect of the vanadium precipitation wastewater treatment system on ammonia nitrogen according to the embodiment of the present invention.

Detailed Description