CN204981134U - Adopt tubular micro -filtration membrane's hydrofluoric acid recycling processed system - Google Patents

Abstract

The utility model relates to a hydrofluoric acid recovery and treatment system using a tubular microfiltration membrane, which includes a waste water tank for regulating treatment, a concentration tank, a tubular membrane module, a filtering water tank, a sludge storage tank and a plate and frame filter press; the regulating The waste water treatment tank is connected to the raw water inlet, and the outlet of the waste water treatment tank is adjusted to be connected to the water inlet of the concentration tank; the water outlet of the concentration tank is connected to the water inlet end of the tubular membrane module; It is passed into the concentration tank by means of flow, and is transported to the tubular membrane module by a circulation pump for solid-liquid separation. At this time, the large flow of waste liquid circulates between the concentrating tank and the tubular membrane module, and the hydrofluoric acid seeped through the tubular membrane module flows out through the outlet port of the filtered water and is directly reused. In this process, the tubular membrane module replaces the traditional sedimentation tank and filtration equipment, no sedimentation and pre-filtration are needed, and the separation of solid particles and liquid can be achieved by direct filtration.

Description

A hydrofluoric acid recovery and treatment system using tubular microfiltration membrane

technical field

The utility model relates to the field of industrial waste water reuse treatment, in particular to a pipe-type micro

Membrane hydrofluoric acid recovery treatment system.

Background technique

Hydrofluoric acid is an aqueous solution of hydrogen fluoride gas, a colorless, fuming, corrosive liquid with violent

Strong pungent odor. Because of the relatively strong binding ability between hydrogen atoms and fluorine atoms, hydrogen

Hydrofluoric acid cannot be completely ionized in water, so theoretically low concentration of hydrofluoric acid is a weak acid.

It is extremely corrosive and can strongly corrode metal, glass and silicon-containing objects.

With the continuous development of industrial society, hydrofluoric acid has appeared in various industrial fields.

Volt, metallurgy, metal processing, glass, electronics, electroplating and other industries, these industries require large

A large amount of hydrofluoric acid is used for etching and cleaning, and a large amount of hydrofluoric acid waste liquid is also produced. these waste

The source of acid is wide and the quantity is large, so it is difficult to purify and comprehensively utilize it, and direct discharge will cause

Cause extremely serious pollution to the environment. Due to the difference in the content of hydrofluoric acid waste liquid and the discharge

The degree of harm to the environment is also different according to the amount of them, but all of them will cause harm to the organisms in the environment.

Even a trace amount of fluorine and its compounds can cause great harm to human and animal body

its serious consequences. Therefore, the full recycling of all fluorine-containing waste is an important part of industrial production.

most important tasks.

Hydrofluoric acid is widely used in etching and cleaning processes in photovoltaic, metallurgy, and glass industries

After use, the used hydrofluoric acid waste liquid generally still has an effective concentration of 1-10%, but it contains a large amount of

A large amount of suspended solids and particulate matter, resulting in the waste liquid can not be reused, and the traditional sedimentation separation

The process also cannot realize the effective separation of suspended solids and hydrofluoric acid in the hydrofluoric acid waste liquid. Because of hydrofluoride

The concentration of suspended particles in the acid waste liquid is very high, so it is not suitable to use traditional filters, filter elements, and bag filters

It is not suitable for ultrafiltration separation, and the sedimentation of particles is extremely poor, and it is not suitable for

It is suitable for solid-liquid separation by precipitation or air flotation. Because hydrofluoric acid needs to be recycled, no

Chemicals can be added, so the traditional sedimentation tank process cannot be used for solid-liquid separation.

Utility model content

The technical problem to be solved by the utility model is to provide a

Phosphate-containing phosphate radicals recovered by filtration of hydrofluoric acid solutions containing suspended solids using tubular microfiltration membranes

Wastewater treatment system, which avoids expensive chemicals and reduces the amount of sludge.

In order to solve the above technical problems, the utility model is realized in the following way: the utility model

A hydrofluoric acid recovery and treatment system using tubular microfiltration membranes, including conditioning treatment

Waste water tanks, thickening tanks, tubular membrane modules, filter water tanks, sludge storage tanks and plate and frame filter presses;

The waste water tank for regulating treatment is communicated with the raw water inlet, and the water outlet of the waste water tank for regulating treatment is connected with the

The water inlet of the thickening tank is connected; the water outlet of the thickening tank is connected with the water inlet of the tubular membrane module

through; the tubular membrane module is provided with a filtered water outlet port and a concentrated water return port, and the filtered water outlet port

It is connected with the filter tank; the concentrated water return port is connected with the water inlet port of the tubular membrane module, and the concentrated water return

The flow end is provided with a sludge concentrate discharge pipeline, and the sludge concentrate discharge pipeline is connected to the sludge storage tank.

pass; the rear of the sludge storage tank is provided with a plate and frame filter press, and the detached water outlet of the plate and frame filter press

It is connected with the regulating treatment waste water tank.

The tubular membrane module is composed of tubular microfiltration membranes for cross-flow filtration, and the tubular membrane module is equipped with

Equipped with circulation pump.

A liquid level controller is arranged in the concentration tank.

The process method adopted in the above-mentioned hydrofluoric acid recovery and treatment system using tubular microfiltration membrane

Including the following steps:

1) Pass the raw water to be treated into the regulated treatment waste water tank for regulated treatment;

2) Pass the mixed liquid in the waste water tank for regulating treatment into the concentration tank by way of overflow

In the concentration tank, the water capacity of the concentration tank should be greater than the water absorption capacity of the circulating pump for 3 minutes, and the concentration tank should be set

The liquid level controller monitors the liquid level in real time;

3) The water in the concentration tank is injected into the tubular membrane module through the circulating pump for solid-liquid separation.

Separated, the hydrofluoric acid waste liquid circulates between the concentrating tank and the tubular membrane module;

4) The tubular membrane module stores the filtered hydrofluoric acid solution in the filter water tank and returns it directly to

used or transported to subsequent processes;

5) The wastewater flowing through the tubular membrane module will be passed into the tubular membrane module again for circulation.

Ring filtration, the concentrate containing sludge produced during this process will be discharged to the sludge storage tank

Inside;

6) Sludge dehydration of the concentrated solution in the sludge storage tank is carried out through the plate and frame filter press

After sludge dehydration treatment, the dewatered water will be injected into the front-end conditioning treatment waste again.

The second treatment is carried out in the water tank; the dehydrated mud cake is subjected to centralized treatment.

Positive effects of the utility model: the utility model adopts a tubular microfiltration membrane

Hydrofluoric acid recovery and treatment system, the hydrofluoric acid waste liquid is passed into the concentrated

The shrinkage tank is transported to the tubular membrane module by a circulating pump for solid-liquid separation. Large flow of waste liquid at this time

Circulate between the concentrating tank and the tubular membrane module, and the hydrofluoric acid leaked through the tubular membrane module is passed through

The filtered water flows out from the outlet end and is reused directly. In this process, the tubular membrane module replaces the traditional sinking

Sediment pool and filtration equipment, no need for sedimentation and pre-filtration, can be directly filtered to achieve solid

Separation of bulk particles and liquids.

In the subsequent stage, a complete solid-liquid separation can be achieved through a plate and frame filter press, and solid particles can be

Recycling, the recovery rate is close to 100%, which can turn solid waste into resources;

The equipment involved is easy to clean, and only needs conventional inorganic acids, alkalis and oxidants, without

Wastewater discharge restrictions.

As the core component of filtration, the tubular membrane module adopts tubular large-flow cross-flow filtration, and the water

The flow tangentially flows through the surface of the membrane at high speed, and it also has the function of scouring and cleaning the surface of the membrane while filtering.

Pollutants are not easy to accumulate, and the membrane surface is not easy to contaminate, suitable for filtering high turbidity (up to 5% suspended

Solid concentration) and the feed liquid with the particle size of the pollutants are similar; the turbidity of the filtered product water is less than 1NTU, which can be

With effective protection against reverse osmosis. Tubular membrane modules can completely replace multiple channels such as sedimentation tanks and filtration

Treatment and filtration equipment, without sedimentation and pre-filtration, can be directly filtered to achieve solid particles and

Liquid separation, tubular membrane modules are used as tubular membrane soft membranes for desalination processes such as reverse osmosis or

Chemical treatment greatly shortens and simplifies the process flow, reduces the system footprint, and improves the after-sales

The recovery rate of continuous equipment and effectively prolong its service life. Compared with other membrane components, tubular

The membrane module has good strength, friction resistance, high concentration chemical cleaning resistance, and can be used in extremely high concentration of suspended solids.

It has excellent performances such as stable operation at high temperature and tolerance to fluctuations in influent water quality.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail

bright.

Fig. 1 is a structural representation of the utility model.

detailed description

As shown in Figure 1, the utility model adopts the hydrofluoric acid recovery treatment of tubular microfiltration membrane

System, including regulating treatment waste water tank, thickening tank, tubular membrane module, filter tank, sludge

Storage tank and plate-and-frame filter press; the wastewater tank for regulating treatment is connected with the raw water inlet, and the regulating place

The water outlet of the wastewater treatment tank is connected with the water inlet of the concentration tank; the water outlet of the concentration tank is connected with the tubular membrane

The water inlet port of the module is connected; the tubular membrane module is provided with a filter water outlet port and a concentrated water return port.

At the flow end, the outlet end of the filtered water is connected to the filter water tank; the return end of the concentrated water is connected to the water inlet of the tubular membrane module

The mouth end is connected, and the concentrated water return end is equipped with a sludge concentrate discharge pipeline, and the sludge concentrate is discharged

The pipeline is connected with the sludge storage tank; a plate and frame filter press is arranged behind the sludge storage tank, and the plate and frame filter press

The detached water outlet of the filter is communicated with the regulating treatment waste water tank.

The tubular membrane module is composed of tubular microfiltration membranes for cross-flow filtration, and the tubular membrane module is equipped with

Equipped with circulation pump.

A liquid level controller is arranged in the concentration tank.

The process method adopted in the above-mentioned hydrofluoric acid recovery and treatment system using tubular microfiltration membrane

Including the following steps:

1) Pass the raw water to be treated into the regulated treatment waste water tank for regulated treatment;

2) Pass the mixed liquid in the waste water tank for regulating treatment into the concentration tank through overflow, and concentrate

The water capacity of the shrinking tank should be greater than the 3-minute water absorption of the circulating pump, and the liquid level control is set in the concentrating tank.

The controller monitors the liquid level in real time;

3) The water in the concentration tank is injected into the tubular membrane module through the circulation pump for solid-liquid separation, and the hydrogen

Fluoric acid waste liquid circulates between the concentrating tank and the tubular membrane module;

4) The tubular membrane module stores the filtered hydrofluoric acid solution in the filter water tank for direct reuse or transport

sent to the follow-up process;

5) The wastewater flowing through the tubular membrane module will be passed into the tubular membrane module again for circulation.

Filtration, the concentrated liquid containing sludge generated during this process will be discharged into the sludge storage tank;

6) Sludge dehydration treatment is performed on the concentrated solution in the sludge storage tank through a plate and frame filter press, and the sludge

The dehydrated dehydrated water will be re-injected into the front-end conditioning waste water tank for further processing.

Carry out the second treatment; carry out concentrated treatment on the mud cake after dehydration.

Claims (3)

1. A hydrofluoric acid recovery treatment system that adopts tubular microfiltration membrane, is characterized in that: Including regulating wastewater tank, thickening tank, tubular membrane module, filter water tank, sludge storage tank and Plate and frame filter press; the regulated and treated wastewater tank is connected to the raw water inlet, and the regulated and treated wastewater The water outlet of the tank is connected with the water inlet of the thickening tank; the water outlet of the thickening tank is connected with the tubular membrane module The water inlet end is connected; the tubular membrane module is provided with a filtered water outlet end and a concentrated water return end, The filtered water outlet port is connected with the filtered water tank; the concentrated water return port is connected with the water inlet port of the tubular membrane module. The concentrated water return end is provided with a sludge concentrate discharge pipeline, and the sludge concentrate discharge pipeline is connected to the The sludge storage tank is connected; a plate and frame filter press is arranged behind the sludge storage tank, and the plate and frame filter press The detached water outlet is communicated with the regulating treatment waste water tank. 2. a kind of hydrofluoric acid that adopts tubular microfiltration membrane according to claim 1 reclaims The processing system is characterized in that: the tubular membrane module is composed of a tubular microfiltration membrane group for cross-flow filtration As a result, a circulating pump is arranged in the tubular membrane module. 3. a kind of hydrofluoric acid that adopts tubular microfiltration membrane according to claim 1 reclaims The treatment system is characterized in that a liquid level controller is set in the concentration tank.