CN111072216A

CN111072216A - Device and method for inducing struvite sediment to form by utilizing modified diatomite

Info

Publication number: CN111072216A
Application number: CN201811226787.8A
Authority: CN
Inventors: 李瑞霞; 何毅; 朱静平
Original assignee: Southwest University of Science and Technology
Current assignee: Southwest University of Science and Technology
Priority date: 2018-10-22
Filing date: 2018-10-22
Publication date: 2020-04-28

Abstract

The technical scheme adopted by the invention for solving the technical problems is as follows: a device and a method for inducing struvite precipitation to form by using modified diatomite comprise a water inlet pipeline, an anaerobic tank supernatant outlet pipeline, a pipeline mixer, a pH regulator and magnesium source feeding tank, a modified diatomite feeding tank, a pH on-line monitor, a struvite reactor, a precipitation filter layer, a partition plate, a guide plate and a water outlet pipe. The anaerobic reactor and the struvite reactor are connected by a water inlet pipeline and a return pipeline, and a pipeline mixer is arranged on a water inlet pipe of the struvite reactor to fully mix the pH regulator and the magnesium source with inlet water; the medicine adding tank is embedded at the upper part of the pipeline mixer in a pipeline connection mode; the struvite reactor adopts a baffle plate and a guide plate to divide the interior of the reactor into an S shape, and the baffle plate is suspended to keep the interior of the reactor communicated; and a pH on-line monitor is arranged, the struvite reactor is provided with a filter layer and a partition plate, the partition plate can be opened at regular time for solid-liquid separation, and a mixture of the diatomite and the sediment after the reaction is recovered.

Description

Device and method for inducing struvite sediment to form by utilizing modified diatomite

Technical Field

The invention relates to a device and a method for inducing struvite sediment to form by utilizing modified diatomite, which are suitable for deep treatment of nitrogen-phosphorus-containing wastewater.

Background

Most of the current common struvite reactors are complex in structure, high in operation difficulty and high in operation cost, consume a large amount of manpower and electric power resources, are mostly used for treating wastewater containing high nitrogen and phosphorus concentration, and are difficult to be applied to engineering in a domestic sewage treatment plant because the cost of adding medicaments is higher than the economic value created by struvite recovery for domestic wastewater containing low phosphorus concentration. The recovery of nitrogen and phosphorus by a struvite precipitation method can realize the reutilization of phosphorus resources and reduce the loss of phosphorus resources and the exploitation of phosphorite, and becomes a hot spot of domestic and foreign research.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a novel reactor which is efficient and energy-saving.

The technical scheme adopted by the invention for solving the technical problems is as follows: a device and a method for inducing struvite precipitation formation by using modified diatomite comprise a water inlet pipeline, an anaerobic tank supernatant water outlet pipeline, a pipeline mixer, a pH regulator and magnesium source dosing tank, a modified diatomite dosing tank, a pH on-line monitor, a struvite reactor, a precipitation filter layer, a filter partition plate, a guide plate and a water outlet pipeline. The anaerobic pool and the struvite reactor are connected by a water inlet pipeline and a return pipeline, and a pipeline mixer is arranged on a water inlet pipe of the struvite reactor to fully mix a pH regulator and a magnesium source with inlet water; the medicine feeding tank is embedded at the upper part of the pipeline mixer in a pipeline connection mode; the struvite reactor adopts a baffle plate and a guide plate to divide the interior of the reactor into an S shape, and the baffle plate is suspended to keep the interior of the reactor communicated; and a pH on-line monitor is arranged, the struvite reactor is provided with a precipitation filter layer and a filter clapboard, the filter clapboard can be opened at regular time for solid-liquid separation, and the mixture of the reacted diatomite and the precipitate is recovered.

The anaerobic tank and the struvite reactor are both of a cubic structure and can be made of hard plastic plates or concrete and other materials according to actual needs.

The pipeline mixer is fixed at the joint of the anaerobic tank and the struvite reactor in a nested mode and is used for quickly and uniformly mixing the pH regulator and the magnesium source.

The two dosing tanks are used for respectively dosing the pH regulator and the magnesium source, the bracket is fixed above the pipeline mixer, and the pipeline mixer is stably fixed above the ground, so that the space is saved, and the operation is convenient.

The S-shaped internal structure enables the sewage to fully react in the flowing process.

The deposition filter layer and the filter partition plate are welded inside the struvite reactor, the filter partition plate is intermittently opened, sewage after reaction is discharged from the lower part, the modified diatomite and the deposition are retained on the filter layer, and struvite deposition and a diatomite mixture are convenient to recover.

Compared with the prior art, the integrated reactor can be used for treating sewage with lower phosphorus concentration, and the chemical dosing tank is arranged above the pipeline mixer, so that the occupied area is saved, and the chemical dosing operation is convenient; the struvite reactor with the S-shaped interior is convenient for fully mixing the wastewater, the precipitator and the pH regulator, can replace the traditional stirring equipment, and saves energy consumption; meanwhile, due to the existence of the filtering baffle and the precipitation filtering layer, the precipitation is convenient and recyclable, and the problems of pipeline blockage and the like are reduced.

Drawings

The details and methods of use of the present invention are further described in the following examples and figures.

Fig. 1 is a simplified schematic diagram of a reactor, and fig. 2 is a schematic diagram of an internal structure of an upper part of a partition plate of a struvite reactor.

Detailed Description

The first part is a simple anaerobic tank reactor, and after the residual sludge enters from the bottom water inlet pipeline (1), an anaerobic environment is formed in the anaerobic tank (2) for anaerobic digestion, so that phosphorus in the mud-water mixed liquid is released, and the concentration of nitrogen and phosphorus in the supernatant is improved. The supernatant enters a struvite reactor (10) through an anaerobic pool supernatant outlet pipeline (3) and a pipeline mixer (5), and the upper part of the pipeline mixer is provided with a pH regulator and a magnesium source dosing tank (4). The second part is a struvite reactor (8), the upper part is provided with a modified diatomite adding tank (6) and an online pH monitor (7) for monitoring the pH value in real time. The middle part is a struvite reactor separated by a precipitation filter layer (9) and a filter baffle plate (11), after a medicament and modified diatomite are added at regular time, inlet water enters the tank along a pipeline mixer (5), sewage flows in an S shape in the tank body along the baffle plate (15) and a guide plate (14), the bottom of the filter baffle plate (15) is suspended, the inside of the reactor is kept communicated, chemical reaction is generated in the flowing process to generate precipitation, after certain retention time, the baffle plate at the lower part of the filter layer is opened, waste water generated after the precipitation reaction flows out to a water storage tank (12) from the lower part and is discharged through a water outlet pipeline (13), and the diatomite and the generated precipitation are recovered from a precipitation and diatomite outlet (10).

Claims

1. A device and a method for inducing struvite sediment to form by using modified diatomite comprise a water inlet pipeline (1), an anaerobic tank (2), an anaerobic tank supernatant water outlet pipeline (3), a dosing tank (4), a pipeline mixer (5), a modified diatomite dosing tank (6), a pH online monitor (7), a struvite reactor (8), a sediment filtering layer (9), a sediment and diatomite outlet (10), a filtering partition plate (11), a water storage tank (12), a water outlet pipeline (13), a guide plate (14) and a partition plate (15). The anaerobic pool (2) is connected with the struvite reactor (8) through a water inlet pipeline (1) and a pipeline mixer (5), and the water inlet pipe of the struvite reactor is provided with the pipeline mixer (5) for fully mixing the inlet water with the pH regulator and the magnesium source; the drug-feeding pot (4) is embedded at the upper part of the pipeline mixer (5) in a pipeline connection way; the upper part of the struvite reactor divides the interior of the reactor into an S shape by a guide plate (14), and the guide plate is suspended to lead the interior of the reactor to be communicated; the drug-feeding pipe is provided with a pH on-line monitor (7), the struvite reactor is provided with a precipitation filter layer (9) and a filter clapboard (11), and the filter clapboard (11) can be opened at regular time for solid-liquid separation and recovery of a mixture of precipitation and diatomite.

2. The line mixer (5) of claim 1 facilitates thorough mixing of the influent water with the pH modifier and the magnesium source, thereby saving the configuration of the stirring device and saving a large amount of electrical energy.

3. The apparatus and method for inducing struvite sediment formation using modified diatomaceous earth as claimed in claim 1, wherein the struvite reactor (8) has an S-shaped partition wall suspended therein and a communication structure therein, so that the wastewater can fully react while flowing along the flow guide plate (14).

4. The apparatus for inducing struvite sediment formation by using modified diatomite as claimed in claim 1, wherein the sediment filter layer (9) and the filter partition plates (11) are welded inside the struvite reactor, the filter partition plates (11) are opened intermittently, sewage generated after the reaction is discharged from the lower part, and the mixture of the sediment and the diatomite is retained in the sediment filter layer (9) for recycling.