Mariculture source water treatment system

Abstract

The utility model discloses a mariculture source water treatment system. The mariculture source water treatment system comprises a pretreatment unit, an ultrafiltration unit, an ultrafiltration backwashing unit, a medicine washing unit and a control unit, the ultrafiltration membrane is used as a core, the filtering precision is high, and the quality of produced water is good; the ultrafiltration membrane can remove float sludge and harmful microorganisms in natural seawater, does not generate harmful by-products, does not bring harmful effects to an artificial mariculture system, and can improve the survival rate of cultured aquatic products.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of seawater aquaculture source water treatment systems. BACKGROUND

[0002] In recent years, the demand for marine products in China is increasing year by year, and the aquaculture scale is also expanding. At present, the total amount of aquaculture in China has ranked in the world. The metabolism of plankton, algae and microorganisms in natural seawater is vigorous, and the reproduction speed is fast. Therefore, it is necessary to sterilize and disinfect the natural seawater obtained from the sea to prevent harmful microorganisms carried in the natural seawater from entering the artificial breeding system, destroying the microecological balance of the artificial breeding water body, and even causing fish diseases and other serious consequences. In addition, natural seawater also contains a large amount of floating mud and impurities, especially after a strong wind and wave. If these microorganisms and floating mud are not removed, it may cause great harm to the breeding production.

[0003] For the floating mud and impurities in natural seawater, sand filtration, coagulation and sedimentation method and other methods are generally used for removal. For the microorganisms such as viruses and bacteria existing in natural seawater, sodium hypochlorite, chlorine dioxide, formaldehyde and other disinfectants are usually used. However, these methods will lead to high residual chlorine in the treated seawater on the one hand, and chlorine disinfection will produce some harmful by-products. For example, since the 1970s, people have successively found that chlorine disinfection will produce halogenated methane and halogenated acetic acid with "three effects" (carcinogenic, teratogenic and mutagenic); by the end of the 20th century, a series of disinfection by-products with higher toxicity such as halogenated furanone, halogenated acetonitrile and halogenated nitrosomethane were successively discovered. Ultraviolet disinfection device is also widely used in natural seawater disinfection, but ultraviolet disinfection method has the following shortcomings due to the limitation of its process principle: the sterilization effect of ultraviolet is only effective during its irradiation, once the treated water leaves the disinfection device, it no longer has residual disinfection capacity and is easy to be contaminated again; even if a bacterium is not inactivated and enters the subsequent system, it cannot prevent it from adhering to the downstream pipeline surface and multiplying offspring; only the microorganisms that absorb ultraviolet will be inactivated, so for water with high suspended solids and poor water quality such as sewage, it is difficult to guarantee the disinfection effect because suspended solids can shelter microorganisms from harm; bacteria are not removed in ultraviolet disinfection device, but are converted into heat sources, and killed microorganisms and other pollutants become food for surviving bacteria. UTILITY MODEL CONTENT

[0004] The purpose of the utility model is to provide a seawater aquaculture source water treatment system.

[0005] The technical solution of the utility model is as follows:

[0006] A seawater aquaculture source water treatment system, comprising

[0007] a pretreatment unit for removing sand and stone from seawater;

[0008] a super filtration unit downstream of the pretreatment unit for removing floating mud and harmful microorganisms from seawater treated by the pretreatment unit;

[0009] a super filtration backwashing unit connected to the super filtration unit for backwashing the super filtration unit;

[0010] a super filtration chemical washing unit connected to the super filtration unit for secondary sodium chemical washing of the super filtration unit;

[0011] and a control unit for controlling the cooperation of the pretreatment unit, the super filtration unit, the super filtration backwashing unit and the super filtration chemical washing unit.

[0012] In a preferred embodiment of the present application,

[0013] the pretreatment unit comprises a source water pump and a sand filter,

[0014] the super filtration unit comprises a super filtration assembly and a water production tank,

[0015] the super filtration backwashing unit comprises a backwashing pump and a backwashing water tank,

[0016] the super filtration chemical washing unit comprises a secondary sodium chemical tank,

[0017] the water inlet of the source water pump is communicated with external natural seawater, the water outlet of the source water pump is communicated with the water inlet of the sand filter through a first electric control valve, the water outlet of the sand filter is communicated with the water inlet of the super filtration assembly through a second electric control valve, the water outlet of the super filtration assembly is respectively communicated with the water inlet of the water production tank, the water inlet of the backwashing water tank and the water inlet of the secondary sodium chemical tank through a third electric control valve, a fourth electric control valve and a fifth electric control valve;

[0018] the water outlet of the backwashing water tank is communicated with the water inlet of the backwashing pump, and the water outlet of the backwashing pump is communicated with the water outlet of the super filtration assembly through a sixth electric control valve;

[0019] the outlet of the secondary sodium chemical tank is respectively communicated with the water outlet of the super filtration assembly and the pipeline between the third electric control valve and the water inlet of the water production tank through the sixth electric control valve and a seventh electric control valve;

[0020] the control unit is electrically connected with the source water pump, the backwashing pump and all the electric control valves.

[0021] Further preferably, the backwashing water tank is provided with an eighth electric control valve for emptying the backwashing water tank and electrically connected with the control unit.

[0022] Further preferably, the secondary sodium chemical tank is provided with a ninth electric control valve for emptying the secondary sodium chemical tank and electrically connected with the control unit.

[0023] Further preferably, a first check valve is arranged between the source water pump and the first electrically controlled valve.

[0024] Further preferably, a second check valve is arranged at the outlet of the backwashing pump.

[0025] Further preferably, the sand filter is provided with a tenth electrically controlled valve for emptying the sand filter and electrically connected to the control unit.

[0026] Further preferably, the ultrafiltration assembly is provided with an eleventh electrically controlled valve for emptying the ultrafiltration assembly and electrically connected to the control unit.

[0027] The beneficial effects of the present application are as follows:

[0028] 1. The present application uses an ultrafiltration membrane as the core, has high filtration precision and produces good quality water; the ultrafiltration membrane can remove floating mud and harmful microorganisms in natural seawater, does not produce harmful byproducts, does not have harmful effects on artificial seawater aquaculture systems, and can improve the survival rate of aquaculture products.

[0029] 2. The present application uses sand filtration as a pretreatment unit, which can effectively slow down the pollution speed of the ultrafiltration membrane in the ultrafiltration filtration unit.

[0030] 3. The present application can meet various natural seawater source conditions, has simple operation, low running pressure, good quality of outlet water, large flux, no secondary pollution, and does not need to add additional chemical agents, thereby reducing the water treatment cost. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The present application is a structural schematic view. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be further described and explained in detail below by means of specific embodiments in conjunction with the accompanying drawings.

[0033] As shown in the drawings, a seawater aquaculture source water treatment system comprises: Figure 1

[0034] A pretreatment unit is used to remove sand and stones in seawater.

[0035] An ultrafiltration unit is arranged downstream of the pretreatment unit and is used to remove floating mud and harmful microorganisms in seawater treated by the pretreatment unit.

[0036] An ultrafiltration backwashing unit is connected to the above-mentioned ultrafiltration unit and is used to backwash the ultrafiltration unit.

[0037] An ultrafiltration chemical washing unit is connected to the above-mentioned ultrafiltration unit and is used to perform secondary sodium chemical washing on the ultrafiltration unit. ​

[0038] and a control unit (not shown in the figure) for controlling the cooperation of the pretreatment unit, the ultrafiltration unit, the ultrafiltration backwashing unit and the ultrafiltration chemical washing unit.

[0039] The pretreatment unit comprises a source water pump 1 and a sand filter 3, the ultrafiltration unit comprises an ultrafiltration assembly 4 and a product water tank 5, the ultrafiltration backwashing unit comprises a backwashing pump 2 and a backwashing water tank 6, and the ultrafiltration chemical washing unit comprises a secondary sodium dosing tank 7.

[0040] The utility model discloses a core is ultrafiltration membrane, and the filtration precision is high, and the water quality is good, and the ultrafiltration membrane can remove the floating mud and harmful microorganism in natural seawater, and does not produce harmful byproducts, and will not bring harmful influence to artificial seawater aquaculture system, can improve the survival rate of aquaculture aquatic products, and sand filtration is used as the pretreatment unit, can effectively slow down the pollution speed of the ultrafiltration membrane in the ultrafiltration filtration unit.

[0041] Specifically,

[0042] The sand filter 3 is used for filtering and removing the floating mud, impurities and the like in natural seawater, and the operating pressure is about 0.2-0.4MPa.

[0043] The ultrafiltration assembly 4 is used for filtering and retaining the pathogenic microorganism such as bacteria and virus in source water, and the ultrafiltration membrane is preferably a hollow fiber ultrafiltration membrane, a tubular ceramic ultrafiltration membrane or a column ceramic ultrafiltration membrane.

[0044] The hollow fiber ultrafiltration membrane has a cutting molecular weight of 60000-150000D, an operating pressure of 0.1-0.3MPa and a flux of 40-80LMH, and the area of a single membrane assembly is 40-100 square meters.

[0045] The tubular ceramic ultrafiltration membrane has a filtration precision of 8-200nm, an operating pressure of 0.1-0.3MPa and a flux of 50-200LMH, the length of a single membrane element is 250-1500mm, the area is 0.1-0.7 square meters, a single membrane assembly is loaded with 1-138 membrane elements, and the membrane shell material of the membrane assembly is 304 stainless steel, 316L stainless steel, FRPP, duplex steel or titanium material.

[0046] The column ceramic ultrafiltration membrane has a filtration precision of 8-200nm, an operating pressure of 0.1-0.3MPa and a flux of 50-200LMH, and the area of a single membrane assembly is 10-30 square meters. The membrane shell material of the membrane assembly is stainless steel or UPVC.

[0047] The secondary sodium dosing tank 7 is used for maintenance cleaning and chemical cleaning of the ultrafiltration membrane, and also used for removing the pollutants of the ultrafiltration membrane.

[0048] The water inlet of the source water pump 1 is communicated with external natural seawater, the water outlet of the source water pump 1 is communicated with the water inlet of the sand filter 3 through a first check valve 11 and a first electric control valve 801 in sequence, the water outlet of the sand filter 3 is communicated with the water inlet of the ultrafiltration assembly 4 through a second electric control valve 802, the water outlet of the ultrafiltration assembly 4 is communicated with the water inlet of the water production tank 5 through a third electric control valve 803, the water inlet of the backwashing water tank 6 through a fourth electric control valve 804 and the water inlet of the secondary sodium dosing tank 7 through a fifth electric control valve 805 respectively;

[0049] The water outlet of the backwashing water tank 6 is communicated with the water inlet of the backwashing pump 2, the water outlet of the backwashing pump 2 is communicated with the water outlet of the ultrafiltration assembly 4 through a sixth electric control valve 806, and the outlet of the backwashing pump 2 is provided with a second check valve 21;

[0050] The outlet of the secondary sodium dosing tank 7 is communicated with the water outlet of the ultrafiltration assembly 4 through the sixth electric control valve 806 and a seventh electric control valve 807 respectively and the pipeline between the third electric control valve 803 and the water inlet of the water production tank 5;

[0051] The backwashing water tank 6 is provided with an eighth electric control valve 808 for emptying and electrically connected with the control unit, and the secondary sodium dosing tank 7 is provided with a ninth electric control valve 809 for emptying and electrically connected with the control unit;

[0052] The sand filter 3 is provided with a tenth electric control valve 810 for emptying and electrically connected with the control unit, and the ultrafiltration assembly 4 is provided with an eleventh electric control valve 811 for emptying and electrically connected with the control unit; the control unit is electrically connected with the source water pump 1, the backwashing pump 2 and all electric control valves, thereby controlling the operation of the equipment components of the utility model.

[0053] The above is only a preferred embodiment of the utility model, so it cannot limit the range of the utility model, that is, equivalent changes and modifications made according to the patent range and content of the specification should still be within the scope of the utility model.

Claims

1. A marine aquaculture source water treatment system, characterized in that: include A pretreatment unit is used to remove sand and gravel from seawater; An ultrafiltration unit is located downstream of the pretreatment unit to remove sludge and harmful microorganisms from the seawater treated by the pretreatment unit. An ultrafiltration backwashing unit is connected to the ultrafiltration unit and is used to backwash the ultrafiltration unit. An ultrafiltration washing unit is connected to the ultrafiltration unit and is used to perform sodium hypochlorite washing on the ultrafiltration unit. A control unit is included to control the coordinated operation of the pretreatment unit, ultrafiltration unit, ultrafiltration backwashing unit, and chemical washing unit.

2. The marine aquaculture source water treatment system as described in claim 1, characterized in that: The pretreatment unit includes a source water pump and a sand filter. An ultrafiltration unit includes an ultrafiltration module and a product water tank. The ultrafiltration backwash unit includes a backwash pump and a backwash water tank. The ultrafiltration washing unit includes a primary sodium dosing tank. The inlet of the source water pump is connected to external natural seawater. The outlet of the source water pump is connected to the inlet of the sand filter through a first electrically controlled valve. The outlet of the sand filter is connected to the inlet of the ultrafiltration module through a second electrically controlled valve. The product water outlet of the ultrafiltration module is connected to the inlet of the product water tank, the inlet of the backwash water tank, and the inlet of the sodium hypochlorite dosing tank through a third, a fourth, and a fifth electrically controlled valve, respectively. The outlet of the backwash water tank is connected to the inlet of the backwash pump, and the outlet of the backwash pump is connected to the product water outlet of the ultrafiltration module through the sixth solenoid valve. The outlet of the sodium dosing tank is connected to the water inlet of the ultrafiltration module and the pipeline between the third electric control valve and the water inlet of the water inlet of the water inlet via the aforementioned sixth and seventh electric control valves, respectively. The control unit is electrically connected to the aforementioned source water pump, backwash pump, and all electrically controlled valves.

3. The marine aquaculture source water treatment system as described in claim 2, characterized in that: The backwash tank has an eighth electrically controlled valve for its emptying and is electrically connected to the control unit.

4. The marine aquaculture source water treatment system as described in claim 2, characterized in that: The sodium dosing tank has a ninth electrically controlled valve for its venting and is electrically connected to the control unit.

5. A marine aquaculture source water treatment system as described in claim 2, characterized in that: A first check valve is provided between the source water pump and the first electrically controlled valve.

6. A marine aquaculture source water treatment system as described in claim 2, characterized in that: The backwash pump is equipped with a second check valve at its outlet.

7. A marine aquaculture source water treatment system as described in claim 2, characterized in that: The sand filter has a tenth electrically controlled valve for its venting and which is electrically connected to the control unit.

8. A marine aquaculture source water treatment system as described in claim 2, characterized in that: The ultrafiltration unit has an eleventh electrically controlled valve for its venting and which is electrically connected to the control unit.

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