Membrane integrated treatment process applied to ship black water and grey water

Abstract

The invention discloses a membrane integrated treatment process for ship black water and grey water, which mainly comprises the following steps: the ship black water and grey water enter a waste water collecting tank and pass through a coarse filter and a silicon carbide membrane treatment device to obtain silicon carbide membrane permeate and silicon carbide membrane concentrated liquid, and the silicon carbide membrane permeate enters an A2 / O + MABR membrane treatment device and a ceramic membrane treatment device to obtain the ship black water and grey water. Separating to obtain ceramic membrane permeate and ceramic membrane concentrated liquor, irradiating the ceramic membrane permeate for a period of time through an ozone reaction device and an ultraviolet disinfection device, and enabling effluent to enter a ship reclaimed water recycling pool for ship use; and the silicon carbide membrane concentrated liquor and the ceramic membrane concentrated liquor enter a concentrated liquor fermentation device to prepare concentrated liquor fermentation liquor which is used as a plant fertilizer. According to the invention, the efficient treatment of ship black water and grey water is realized, the reuse of ship reclaimed water is realized, the supplement of fresh water is saved, the carbonized membrane concentrated liquid and the ceramic membrane concentrated liquid are subjected to resource utilization after fermentation, and meanwhile, the process has the advantages of high efficiency, stability, small occupied area and the like.

Description

Technical Field

[0001] The present invention belongs to the field of sewage treatment, and relates to a membrane integrated treatment process applied to black water and grey water of ships. Background Art

[0002] Ship black water usually contains high COD, high NH 3 -N and other pollutants, the pollutants contained in the gray water of ships are relatively low in COD. Due to the space limitations of ships and the complex characteristics of water quality, conventional biochemical treatment devices are used for treatment, and it is impossible to achieve stable and standard discharge for a long time, which in turn affects the daily operation of ships and harms the ecological environment. Patent CN201610872100 reports a ship black water and gray water treatment device and a ship black water and gray water treatment method. The black water and gray water are pre-treated and then connected to the biological treatment unit after entering the homogenization tank. The biological treatment unit is also connected to the photoelectrocatalytic reaction unit and the sludge treatment unit. However, in the treatment process of domestic sewage on ships, there are problems such as unstable performance and large equipment space. Patent CN202211323799 reports a ship-specific epidemic prevention sewage treatment device, which is mainly composed of a domestic sewage treatment unit and an ozone disinfection treatment unit. The domestic sewage treatment unit includes a regulating tank, an aerobic tank and a clear water tank. The ozone disinfection treatment unit includes an oxidation reaction water tank and an integrated ozone generator.

[0003] Membrane separation technology is a physical separation process that includes ultrafiltration, nanofiltration, reverse osmosis and other processes. It has the characteristics of small footprint and high processing efficiency. It has important applications in the fields of reclaimed water reuse and zero emission. Among them, inorganic membranes (silicon carbide, ceramic membranes, etc.) have the characteristics of stable performance, long service life, small footprint and high efficiency. They have been widely used in the fields of water treatment and material separation.

[0004] Therefore, seeking efficient and stable ship black water and gray water treatment technology has become an urgent need in this field. Summary of the invention

[0005] The purpose of the present invention is to provide a membrane integrated treatment process for ship black water and grey water.

[0006] The technical solution of the present invention is: A membrane integrated treatment process for ship black water and gray water, mainly comprising: ship black water and gray water enter the wastewater collection box, enter the coarse filter in turn through the delivery pump, the residue is adsorbed on the filter bag of the coarse filter, the filtrate enters the silicon carbide membrane treatment device, and the silicon carbide membrane permeate and silicon carbide membrane concentrate are obtained. The silicon carbide membrane permeate enters A 2 / O+MABR membrane treatment device, after a period of reaction, the reaction liquid enters the ceramic membrane treatment device, and is separated to obtain ceramic membrane permeate and ceramic membrane concentrate. The ceramic membrane permeate passes through the ozone reaction device and the ultraviolet disinfection device, and after irradiation for a period of time, the effluent enters the ship's grey water reuse pool for use by the ship; the silicon carbide membrane concentrate and the ceramic membrane concentrate enter the concentrate fermentation device, and are fermented at a certain temperature for a period of time to obtain the concentrate fermentation liquid, which is then bottled and used as plant fertilizer.

[0007] Among them, the coarse filter adopts a bag filter with a filter aperture of 5-10mm. Its main purpose is to intercept debris and be cleaned regularly; Among them, the silicon carbide membrane treatment device uses a silicon carbide membrane tube with a pore size of 300-1000 nm. Its main purpose is to intercept large particle pollutant concentrates with a pore size greater than 300-1000 nm. The effluent turbidity reaches less than 5 NTU and is used as a raw material for the concentrate fermentation device; Among them, A 2 / O+MABR membrane treatment device, using MABR membrane non-porous aeration, enriching biochemical bacteria on the membrane surface, the reaction time is controlled at 10-20 h, COD removal rate reaches more than 80%, NH 3 -N removal rate reaches over 90%; Among them, the ceramic membrane treatment device uses a ceramic membrane tube with a pore size of 50-100 nm, which is mainly used to intercept A 2 / O+Sludge and other particles in the MABR membrane pool ensure that the effluent turbidity is below 0.5 NTU; Among them, the ozone reaction device uses an ozone generator to prepare ozone, and the ozone concentration is controlled at 10-15 mg / m 3 , further remove COD and NH 3 -N and other pollutants, the removal rate is 10%-20%, making COD, NH 3 -N meets the requirements for ship reuse; Among them, the ultraviolet disinfection device uses 253.7 nm ultraviolet radiation, and the time is controlled to 10-15 minutes. Its main function is to eliminate bacteria and viruses in the recycled water, and further improve the quality of the ship's recycled water; Among them, the concentrated liquid fermentation device has a reaction temperature of 25-35 o C, reaction time 5-7 days, sealed filling in plastic cans.

[0008] Compared with the prior art, the present invention has significant advantages: first, the solid particulate pollutants in the ship's black water and gray water are separated by graded pretreatment using silicon carbide membranes, and the concentrated liquid is used as a raw material for plant fertilizer to achieve the reduction and resource utilization of pollutants; second, the A 2The / O+MABR membrane treatment device achieves efficient and low-cost treatment of ship wastewater, with a COD degradation rate of more than 80% and NH 3 The -N removal rate reaches more than 90%, and the produced water is then treated by a ceramic membrane, an ozone reaction device, and an ultraviolet disinfection device, and is used as recycled water for ships, saving the replenishment of fresh water. Finally, the process integrates physical, chemical, and biochemical treatment processes, and has the advantages of high efficiency, stability, and small footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The present invention provides a schematic diagram of a membrane integrated treatment process for ship black water and grey water. DETAILED DESCRIPTION

[0010] Comparative Example 1: The volume of black water and gray water entering the ship is 1 m 3 Wastewater collection tank, consisting of 1 m 3 / h variable frequency delivery pump, filtered through a 10mm bag coarse filter, the filtrate is then sent into a 2 m 3 A 2 / O+MBR integrated membrane treatment device, after 20 hours of reaction, the effluent turbidity reaches below 1 NTU through the MBR membrane system, and the effluent passes through the ozone reaction device to further remove COD and NH 3 -N and other pollutants, and then enter the ultraviolet disinfector for 15 minutes of irradiation. The effluent was tested to have a COD of 58 mg / L and NH 3 -N is 14 mg / L, turbidity is 0.93 NTU, entering the ship's effluent pool; A 2 / The sludge in the O+MBR integrated membrane treatment device is regularly treated as hazardous waste, cleaned, collected and outsourced for treatment. Example

[0011] The volume of black water and gray water entering the ship is 1 m 3 Wastewater collection tank, consisting of 1 m 3 / h variable frequency delivery pump, filtered through a 10 mm bag coarse filter to obtain a filtrate, which passes through the circulation pump of the silicon carbide membrane treatment device and enters the silicon carbide membrane treatment device with a pore size of 1000 nm. Particles with a particle size greater than 1000 nm are retained by the silicon carbide membrane tube, and the turbidity of the effluent reaches below 5NTU. After being treated by the silicon carbide membrane, silicon carbide membrane permeate and silicon carbide membrane concentrate are obtained. Among them, the concentrate retained by the silicon carbide membrane is used as the raw material of the concentrate fermentation device, and the silicon carbide membrane permeate enters a volume of 2 m 3 A 2 / O+MABR integrated membrane treatment device, after 10 h of reaction, the reaction liquid enters the ceramic membrane treatment device with a pore size of 50 nm through the ceramic membrane circulation pump, A2 / O+MABR membrane pool, the sludge and other particles are intercepted, the effluent turbidity is below 0.3 NTU, and the ceramic membrane is separated to obtain ceramic membrane permeate and ceramic membrane concentrate. The ceramic membrane permeate is filtered through 10 mg / m 3 The ozone reaction device can further remove COD and NH 3 -N and other pollutants, and then entered the ultraviolet disinfector for 10 minutes of irradiation. The effluent was tested to have a COD of 32 mg / L and NH 3 -N is 10 mg / L and turbidity is 0.28 NTU, and it enters the ship's greywater reuse pool for use by ships; silicon carbide concentrate and ceramic membrane concentrate are pumped into the concentrate fermentation device and fermented at 25°C for 7 days to obtain concentrate fermentation liquid, which is filled in plastic bottles and used as plant fertilizer. Example

[0012] The volume of black water and gray water entering the ship is 1 m 3 Wastewater collection tank, consisting of 1 m 3 / h variable frequency delivery pump, filtered through a 5mm bag coarse filter to obtain a filtrate, which passes through the circulation pump of the silicon carbide membrane treatment device and enters the silicon carbide membrane treatment device with a pore size of 300 nm. Particles with a particle size greater than 300 nm are retained by the silicon carbide membrane tube, and the turbidity of the effluent reaches below 1NTU. After being treated by the silicon carbide membrane, silicon carbide membrane permeate and silicon carbide membrane concentrate are obtained. Among them, the concentrate retained by the silicon carbide membrane is used as the raw material of the concentrate fermentation device, and the silicon carbide membrane permeate enters a volume of 2 m 3 A 2 / O+MABR integrated membrane treatment device, after 20h of reaction, the reaction liquid enters the ceramic membrane treatment device with a pore size of 100 nm through the ceramic membrane circulation pump, A 2 / O+MABR membrane pool sludge and other particles are intercepted and separated by ceramic membrane to obtain ceramic membrane permeate and ceramic membrane concentrate. The ceramic membrane permeate is separated by 15mg / m 3 The ozone reaction device can further remove COD and NH 3 -N and other pollutants, and then enter the ultraviolet disinfector for 15 minutes of irradiation. The effluent was tested to have a COD of 23 mg / L and NH 3 -N is 6 mg / L, and turbidity is 0.46 NTU, which enters the ship's greywater reuse pool for use by ships; silicon carbide concentrate and ceramic membrane concentrate are pumped into the concentrate fermentation device and fermented at 35°C for 5 days to obtain concentrate fermentation liquid, which is filled in plastic bottles and used as plant fertilizer. Example

[0013] The volume of black water and gray water entering the ship is 1 m 3 Wastewater collection tank, consisting of 1 m 3 / h variable frequency delivery pump, filtered through a 10mm bag coarse filter to obtain a filtrate, which passes through the circulation pump of the silicon carbide membrane treatment device and enters the silicon carbide membrane treatment device with a pore size of 500 nm. Particles with a particle size greater than 500 nm are retained by the silicon carbide membrane tube, and the turbidity of the effluent reaches below 2NTU. After being treated by the silicon carbide membrane, silicon carbide membrane permeate and silicon carbide membrane concentrate are obtained. Among them, the concentrate retained by the silicon carbide membrane is used as the raw material of the concentrate fermentation device, and the silicon carbide membrane permeate enters a volume of 2 m 3 A 2 / O+MABR integrated membrane treatment device, after 15h of reaction, the reaction liquid enters the ceramic membrane treatment device with a pore size of 80 nm through the ceramic membrane circulation pump, A 2 / O+MABR membrane pool sludge and other particles are intercepted and separated by ceramic membrane to obtain ceramic membrane permeate and ceramic membrane concentrate. The ceramic membrane permeate is separated by 12mg / m 3 The ozone reaction device can further remove COD and NH 3 -N and other pollutants, and then enter the ultraviolet disinfector for 12 minutes of irradiation. The effluent was tested to have a COD of 27 mg / L and NH 3 -N is 9 mg / L and turbidity is 0.43 NTU, which enters the ship's greywater reuse pool for use by ships; silicon carbide concentrate and ceramic membrane concentrate are pumped into the concentrate fermentation device and fermented at 30°C for 6 days to obtain concentrate fermentation liquid, which is then filled in plastic bottles and used as plant fertilizer. Implementation Effect

[0014] name Outlet COD value / mg / L <![CDATA[Effluent NH 3 -N value / mg / L]]> Outlet turbidity / NTU Solid waste generation Can it be reused? Comparative Example 1 58 14 0.93 have no Example 1 32 10 0.28 none able Example 2 23 6 0.46 none able Example 3 27 9 0.43 none able As can be seen from the above table, after the integrated membrane treatment process for ship black water and gray water of the present invention, the effluent COD, HN 3 -N, turbidity and other indicators are significantly lower than conventional A 2 The O+MBR process is implemented, and the effluent is used by ships without generating any solid waste.

Claims

1. A membrane integrated treatment process for ship black water and gray water, characterized in that: The black water and gray water of the ship enter the wastewater collection tank, and then enter the coarse filter through the delivery pump to intercept the impurities and obtain the filtrate. After passing through the silicon carbide membrane treatment device, the silicon carbide membrane permeate and silicon carbide membrane concentrate are obtained. Among them, the silicon carbide membrane permeate enters A 2 / O+MABR membrane treatment device after a period of reaction, the reaction liquid enters the ceramic membrane treatment device, after separation to obtain ceramic membrane permeate and ceramic membrane concentrate, the ceramic membrane permeate further removes COD, NH3-N and other pollutants in the water after passing through the ozone reaction device, then enters the ultraviolet disinfection device, after irradiation for a period of time, the effluent enters the ship's grey water reuse pool as ship reuse; silicon carbide concentrate and ceramic membrane concentrate enter the concentrate fermentation device, after fermentation at a certain temperature for a period of time, the concentrate fermentation liquid is obtained, after filling, it is used as plant fertilizer.

2. A membrane integrated treatment process for ship black water and grey water as claimed in claim 1, characterized in that: The coarse filter is a bag filter, and the filter aperture is controlled to be 5-10 mm.

3. A membrane integrated treatment process for ship black water and gray water according to claim 1, characterized in that: In the silicon carbide film processing device, the pore size of the silicon carbide film is 300-1000 nm.

4. A membrane integrated treatment process for ship black water and gray water according to claim 1, characterized in that: The A 2 / O+MABR membrane treatment device adopts MABR membrane non-porous aeration to enrich biochemical bacteria on the membrane fiber surface. The reaction time is controlled at 10-12 h. The COD removal rate reaches more than 80%, and the NH3-N removal rate reaches more than 90%.

5. A membrane integrated treatment process for ship black water and gray water as claimed in claim 1, characterized in that: The ceramic membrane processing device has a ceramic membrane pore size of 50-100 nm.

6. A membrane integrated treatment process for ship black water and gray water according to claim 1, characterized in that: The ultraviolet disinfection device has an ultraviolet irradiation time controlled to be 10-15 minutes.

7. A membrane integrated treatment process for ship black water and gray water according to claim 1, characterized in that: The concentrated liquid fermentation device has a reaction temperature controlled at 25-35 o C, reaction time is controlled for 5-7 days.

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