CN110316824B - Cooperative treatment device and cooperative treatment method for ship waste gas washing waste liquid and ship domestic sewage - Google Patents
Cooperative treatment device and cooperative treatment method for ship waste gas washing waste liquid and ship domestic sewage Download PDFInfo
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Abstract
The invention relates to a device and a method for the cooperative treatment of ship waste gas washing waste liquid and ship domestic sewage. The method comprises the steps of pumping the waste gas desulfurization washing liquid of the marine diesel engine and domestic sewage from the bottom of a heterotrophic reaction zone by a water pump, carrying out a sulfate reduction reaction and a degradation reaction of organic matters mainly containing protein in the heterotrophic reaction zone, overflowing the waste gas desulfurization washing liquid to a buffer zone from the top end after the reaction, pumping the waste gas denitrification washing liquid of the marine diesel engine from a water inlet at the upper end of the buffer zone, mixing the waste gas denitrification washing liquid with the effluent of the previous zone, jointly entering the autotrophic reaction zone from the bottom of the buffer zone, fully contacting with activated sludge in the autotrophic zone, carrying out a combined reaction of autotrophic desulfurization denitrification and anaerobic ammonia oxidation, and then discharging the waste gas denitrification washing liquid and the domestic sewage from a water outlet at the upper end. The method ensures that the reaction device stably operates under the condition of high load, and can realize the high-efficiency synchronous removal of sulfate and nitrite in the waste washing liquid of the ship waste gas and organic matters in the domestic sewage.
Description
Technical Field
The invention relates to a device and a method for treating waste gas desulfurization and denitration washing liquid of a marine diesel engine, in particular to a device and a method for cooperatively treating waste gas washing liquid of a marine diesel engine and domestic sewage of a marine diesel engine.
Background
With the development of international trade, the harmful exhaust emission of marine diesel engines is becoming more and more serious, and therefore, research and development of marine exhaust treatment processes are urgently needed to cope with such pollution. In the technology of desulfurization and denitration of marine diesel engine exhaust gas, an open method in a wet treatment method is mostly adopted, i.e. seawater is adopted to absorb sulfur oxides and nitrogen oxides in the exhaust gas, so that washing waste liquid containing sulfate, sulfite, nitrate and nitrite is generated, and the salt content of the washing waste liquid is extremely high. According to relevant regulations, such washing waste liquid needs to be stored on ships and intensively treated after coming to shore. The amount of waste liquid generated by the open washing method of the ship waste gas is huge, and a large amount of limited space resources of the ship need to be occupied. Therefore, research and technical development of in-situ treatment methods of waste washing liquid of ship exhaust gas are urgently needed to solve the problem that a large amount of waste washing liquid of ship exhaust gas cannot be rapidly treated on a ship.
The physical and chemical treatment method for the waste gas washing liquid of the marine diesel engine has the advantages of high investment and operation cost, high energy consumption and secondary pollution, and the biological method has the advantages of low investment, low energy consumption, high removal rate and the like, thereby being an economical and feasible method. In the conventional biological desulfurization treatment method, a sulfate reduction process is taken as a representative, and an organic matter is required to be additionally added to supply sulfate reducing bacteria as a carbon source, so that the operation cost is greatly increased; in the conventional biological denitrification treatment method, heterotrophic denitrification is mainly used, nitrate and nitrite are reduced into nitrogen by heterotrophic denitrifying bacteria in the presence of organic matters, and a large amount of organic carbon is still required to be added as a carbon source in the process. Therefore, the addition of additional carbon sources has become a major factor limiting the application of anaerobic biological processes on ships.
The ship domestic sewage contains a large amount of organic matters mainly containing protein, and can provide carbon sources and energy sources for anaerobic metabolism of sulfate reducing bacteria. If a combined process of autotrophic desulfurization and denitrification, anaerobic ammonia oxidation and sulfate reduction is adopted, not only can nitrite in the washing waste liquid be removed, but also a large amount of sulfide and ammonia nitrogen generated in the sulfate reduction process can be treated. Therefore, the ship waste gas washing waste liquid and the domestic sewage are subjected to synergistic treatment, so that the problem of insufficient carbon source in the biological desulfurization process can be solved, high-concentration organic matters in the sewage can be removed, the purpose of treating waste by waste is achieved, and the ship space and the operation cost are saved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device and a method for cooperatively treating waste washing liquid of marine diesel engine exhaust and marine domestic sewage, which can achieve the purposes of synchronously removing a large amount of sulfate and organic matters in the first stage and removing nitrite, sulfide and ammonia nitrogen in the second stage.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention provides a cooperative treatment device of waste gas washing liquid of a marine diesel engine and marine domestic sewage, which comprises a reactor shell, wherein the reactor shell is provided with a liquid inlet I, a liquid inlet II and a liquid outlet; the heterotrophic reaction zone and the autotrophic reaction zone are respectively provided with a stirrer; inclined baffles are respectively fixed on two sides of the inner wall of the heterotrophic reaction zone and the autotrophic reaction zone; the cooperative treatment device also comprises a liquid inlet box I and a liquid inlet box II, wherein liquid in the liquid inlet box I flows into the liquid inlet I through the water pump I, and liquid in the liquid inlet box II flows into the liquid inlet II through the water pump II; the upper ends of the heterotrophic reaction zone and the autotrophic reaction zone are provided with air outlet holes; one side of the top of the reactor shell, which corresponds to the heterotrophic reaction zone, is provided with a sludge filling port I, and one side of the reactor shell, which corresponds to the autotrophic reaction zone, is provided with a sludge filling port II.
The device for the cooperative treatment of the ship waste gas washing waste liquid and the ship domestic sewage comprises a heterotrophic reaction zone, a buffer zone, a waste gas treatment zone and a waste gas treatment zone, wherein the upper part of the heterotrophic reaction zone is provided with an overflow port communicated with the buffer zone, and the lower part of the buffer zone is communicated with the autotrophic reaction zone; the vertical height of the overflow port is 1.0-2.0 cm.
According to the cooperative treatment device for the ship waste gas washing waste liquid and the ship domestic sewage, the inclined angle of the inclined baffle in the horizontal direction is 50-60 degrees, the vertical height of the inclined baffle is 10-15cm, and the interval between the bottom of the inclined baffle and the inner wall of the device in the horizontal direction is 0.5-1.5 cm.
Above-mentioned synergistic treatment device of boats and ships waste gas washing waste liquid and boats and ships domestic sewage, the agitator includes agitator motor and stirring rake, and the distance of stirring rake lower part is 5.0cm-8.0cm from the reactor bottom.
According to the cooperative treatment device for the ship waste gas washing waste liquid and the ship domestic sewage, the distance between the central axis of the liquid inlet I and the lower surface of the reactor is 1.0-2.0 cm; the central axis of the liquid outlet is 1.0-2.5cm away from the upper surface of the reactor.
Above-mentioned coprocessing device of boats and ships waste gas washing waste liquid and boats and ships domestic sewage, coprocessing device still includes the liquid tank.
The invention also provides a cooperative treatment method of the ship waste gas washing waste liquid and the ship domestic sewage, which comprises the following steps:
inoculating heterotrophic activated sludge into a heterotrophic reaction zone, and inoculating autotrophic activated sludge into an autotrophic reaction zone; the method comprises the following steps of putting ship waste gas desulfurization washing waste liquid and ship domestic sewage into a liquid inlet box I, enabling the ship waste gas desulfurization washing waste liquid and the ship domestic sewage to enter a heterotrophic reaction zone from a liquid inlet I at the bottom end of a reactor through a water pump I, fully mixing the ship waste gas desulfurization washing waste liquid and the ship domestic sewage with heterotrophic activated sludge mainly containing sulfate reducing bacteria under the action of a stirrer to generate a sulfate reduction reaction and a degradation reaction of organic matters mainly containing protein, and performing sludge-water separation under the action of an inclined baffle; the treated water overflows to a buffer area from an overflow port at the upper part of the heterotrophic reaction area, meanwhile, the ship waste gas denitration washing waste liquid in a liquid inlet box II is pumped into a liquid inlet II through a water pump II and flows into the buffer area, the ship waste gas denitration washing waste liquid and the effluent of the heterotrophic reaction area enter an autotrophic reaction area from the bottom of the buffer area, the ship waste gas denitration washing waste liquid and the autotrophic activated sludge mainly containing autotrophic desulfurization denitrification bacteria and anaerobic ammonium oxidation bacteria are fully mixed under the action of a stirrer to generate a combined reaction of autotrophic desulfurization denitrification and anaerobic ammonium oxidation, mud and water are separated under the action of an inclined baffle, and the treated water is discharged from a liquid outlet at the upper part of the autotrophic reaction area.
The method for the synergistic treatment of the ship waste gas washing waste liquid and the ship domestic sewage comprises the following steps of: anaerobic activated sludge is put into a continuous stirring reactor, mixed wastewater of ship flue gas desulfurization washing waste liquid and ship domestic sewage is introduced, a continuous water inlet mode is adopted, the temperature in the reactor is set to be 25-35 ℃, the stirring speed is 15-25r/min, the hydraulic retention time is 8-36h, and SO is added4 2-The concentration is 900-1000mg/L in terms of S, the organic matter is 250-310mg/L in terms of N, the pH value is 7.0-7.8, the hydraulic retention time is 8-36h when SO4 2-When the removal rate reaches more than 90 percent and the sulfide generation rate reaches more than 70 percent, the acclimation of the heterotrophic activated sludge mainly containing sulfate reducing bacteria is completed;
the autotrophic activated sludge is domesticated autotrophic activated sludge, and the domestication method of the autotrophic activated sludge comprises the following steps: anaerobic activated sludge is put into a continuous stirring reactor, artificially simulated ship waste gas denitration washing waste liquid is introduced, a continuous water inlet mode is adopted, the temperature in the reactor is set to be 25-35 ℃, the stirring speed is 15-25r/min, and S is in water inlet2-The concentration is 250-300mg/L in terms of S, NO2 -200-300mg/L, NH calculated by N4 +150 mg/L in terms of N, and the hydraulic retention time is 8-36h when NO is measured2 -And S2-The removal rate of the catalyst respectively reaches more than 90 percent, NH4 +When the removal rate of-N reaches more than 70%, the acclimation of the autotrophic desulfurization denitrifying bacteria and anaerobic ammonium oxidation bacteria is completed.
Further, the better acclimation conditions of the heterotrophic activated sludge are as follows: SO (SO)4 2-Concentration of900-950mg/L in terms of S, 290-290 mg/L in terms of N, the pH value is 7.6-7.8, the hydraulic retention time is 24 hours when continuous flow water enters, the set temperature is 35 +/-0.5 ℃, and the stirring speed is 15 r/min;
the more optimal domestication conditions of the autotrophic activated sludge are as follows: s2-The concentration is 200-230mg/L, NH in terms of S4 +160-170mg/L of NO in terms of N2 -The concentration is 250-270mg/L calculated by N, the pH value is 7.6-7.8, the hydraulic retention time is 24h when continuous flow water inflow is carried out, the set temperature is 35 +/-0.5 ℃, and the stirring speed is 20 r/min.
The method for the cooperative treatment of the ship waste gas washing waste liquid and the ship domestic sewage is characterized in that the anaerobic activated sludge is taken from an anaerobic treatment device such as an anaerobic fermentation tank or a sludge concentration tank.
In the method for cooperatively treating the waste washing liquid of the ship waste gas and the ship domestic sewage, the heterotrophic activated sludge domestication adopts artificial water distribution, and the artificial water distribution comprises natural clean seawater, peptone and NaHCO3(ii) a The domestication of the autotrophic denitrification activated sludge adopts artificial water distribution, and the artificial water distribution comprises natural clean seawater and NaNO2、Na2S、NH4Cl and NaHCO3。
The method for the cooperative treatment of the ship waste gas washing waste liquid and the ship domestic sewage comprises the following steps of inoculating heterotrophic activated sludge which mainly comprises sulfate reducing bacteria into a heterotrophic reaction zone (12) at the inoculation concentration: 20-40 gMLVSS/L.
The inoculation concentration of the autotrophic activated sludge inoculated to the autotrophic reaction zone (14) mainly comprises autotrophic desulfurization and denitrification bacteria and anaerobic ammonium oxidation bacteria is as follows: 25-45 gMLVSS/L.
The method for the synergistic treatment of the ship waste gas washing waste liquid and the ship domestic sewage is characterized in that the operation conditions of the heterotrophic reaction zone (12) are as follows: SO (SO)4 2-The concentration is 900-1000mg/L in terms of S, the organic matter is 270-310mg/L in terms of N, the pH value is 7.0-7.8, the stirring speed is 10-20r/min, continuous flow water inflow is carried out, and the hydraulic retention time is 8-36 h;
the operating conditions of the autotrophic reaction zone (14) are as follows: NO in influent water2 -In terms of N200mg/L, pH value of 7.0-7.8, stirring speed of 10-20r/min, continuous flow water inflow, and hydraulic retention time of 8-36 h.
The invention also provides application of the synergistic treatment device in ship wastewater treatment.
The invention adopts a method of separately domesticating activated sludge and treating wastewater in a sectional manner, which comprises the following steps: respectively providing proper environmental conditions for main functional bacteria such as sulfate reducing bacteria, desulfurization denitrifying bacteria, anaerobic ammonium oxidation bacteria and the like SO as to facilitate the rapid growth of autotrophic and heterotrophic microorganisms in the early stage and realize the subsequent SO4 2-Organic matter, NO2 -The synchronous and efficient removal of the microorganism provides a microbial foundation; the sectional treatment method of waste water is divided into a heterotrophic reaction stage and an autotrophic reaction stage, and the heterotrophic reaction stage is placed before the autotrophic reaction stage, so that NO can be prevented2 -Inhibiting sulfate reducing bacteria, inhibiting autotrophic microorganisms by high-concentration organic matters, and reducing a great amount of S generated by sulfate in a heterotrophic reaction zone2-And NH4 +Can react with NO in the autotrophic reaction zone2 -The autotrophic reaction is generated, so that the autotrophic reaction is thoroughly removed, and secondary pollution is prevented.
The following are the main reactions taking place in the heterotrophic reaction zone:
Org-C+SO4 2-→S2-+CO2↑+NH4 + (1)
the following are the main reactions taking place in the autotrophic reaction zone:
NH4 ++NO2 -→N2↑+2H2O (2)
3S2-+2NO2 -+8H+→3S0+N2↑+4H2O (3)
the invention has the beneficial effects that:
1. the device and the treatment method of the invention supplement the ship domestic sewage into the ship diesel engine waste gas desulfurization washing waste liquid, the removal rate of sulfate in the heterotrophic reaction zone can reach more than 95%, the generation rate of sulfide can reach more than 70%, the removal rate of organic matters can reach 100%, the removal rate of nitrite in the autotrophic reaction zone can reach more than 90%, the removal rate of sulfide can reach more than 90%, and the removal rate of ammonia nitrogen can reach more than 80%, thereby not only solving the problem of insufficient carbon source in the reduction process of heterotrophic sulfate, but also realizing the treatment of waste by waste, and saving the space and the operation cost of ships.
2. The device and the treatment method thereof place the ship domestic sewage, the ship diesel engine waste gas desulfurization waste liquid and the denitration waste liquid in the same reverse device for cooperative treatment, and compared with the situation that three different waste liquids are respectively treated by using three sets of treatment devices in the prior art, the device and the treatment method thereof can realize the high-efficiency synchronous removal of sulfate, nitrite and organic matters in the three waste liquids by using one set of device, thereby saving the operation cost and the space resources.
3. The invention adopts a sectional wastewater treatment method, can effectively avoid the inhibiting effect of nitrite on sulfate reducing bacteria, and sulfide generated by sulfate reduction can be utilized by the desulfurization denitrification reaction of the next stage, thereby achieving the purpose of synchronously removing nitrogen and sulfur pollutants.
4. The sludge domestication method adopts seawater to domesticate sulfate reducing bacteria, desulfurization denitrifying bacteria and anaerobic ammonium oxidation bacteria directly in a high-salt environment, promotes the rapid formation of high-salt-resistant microbial flora, and is beneficial to the efficient operation of a desulfurization and denitrification process under the conditions of high load and high salt. Meanwhile, the sludge domestication can be performed in advance on land, and successfully domesticated active sludge is directly inoculated into a reaction device on the ship, so that the starting time of the device on the ship is greatly shortened, the device is suitable for the ship operation environment, and limited space resources on the ship are not required to be occupied for sludge domestication.
5. The organic matter used in the domestication stage of the invention adopts peptone to simulate ship domestic sewage rich in a large amount of macromolecular organic matter, which is beneficial to domesticating high-activity sulfate reducing bacteria capable of degrading macromolecular organic matter. The water inlet in the acclimation stage is alkaline, so that the high-activity sulfate reducing bacteria in the marine alkali bias environment can be acclimated, and the generation of hydrogen sulfide gas is greatly reduced in the alkaline environment so as to avoid secondary pollution.
Drawings
FIG. 1 is a schematic view of a co-processing apparatus of the present invention;
FIG. 2 acclimation stage SO in example 14 2-Removal effect and S2-Generating an effect graph;
FIG. 3 acclimatization phase NO in example 12 -、NH4 +、S2-The removal effect map of (1);
FIG. 4 heterotrophic reaction zone SO of example 14 2-Removal effect and S2-Generating an effect graph;
FIG. 5 autotrophic reaction zone NO in example 12 -、NH4 +、S2-The removal effect map of (1);
FIG. 6 heterotrophic reaction zone SO in example 24 2-Removal effect and S2-Generating an effect graph;
FIG. 7 autotrophic reaction zone NO in example 22 -、NH4 +、S2-The removal effect map of (1);
in the figure, 1, a water inlet box II, 2, a liquid inlet II, 3, an air outlet, 4, a stirring paddle motor, 5, a water pump I, 6, a liquid outlet, 7, a water inlet box I, 8, a liquid inlet I, 9, a stirring paddle, 10, a water outlet box, 11, an inclined baffle, 12, a heterotrophic reaction zone, 13, a buffer zone, 14, an autotrophic reaction zone, 15, a water pump II, 16, an overflow port, 17, a reactor shell, 18, a sludge filling port I, 19 and a sludge filling port II.
Detailed Description
Example 1
The embodiment provides a device and a method for the cooperative treatment of ship waste gas washing waste liquid and ship domestic sewage. The cooperative treatment device comprises a reactor shell 17, wherein a liquid inlet I8, a liquid inlet II 2 and a liquid outlet 6 are arranged on the reactor shell 17, a heterotrophic reaction zone 12, a buffer zone 13 and an autotrophic reaction zone 14 which are sequentially communicated are arranged in the reactor shell 17, the volumes of the heterotrophic reaction zone 12 and the autotrophic reaction zone 14 are the same, an overflow port 16 is arranged at the upper part of the heterotrophic reaction zone 12 and communicated with the buffer zone 13, the vertical height of the overflow port 16 is 1.5cm, the lower part of the buffer zone 13 is communicated with the autotrophic reaction zone 14, and air outlet holes 3 are arranged at the upper ends of the heterotrophic reaction zone 12 and the autotrophic reaction zone 14; the liquid inlet I8 is communicated with the heterotrophic reaction zone 12, the liquid inlet II 2 is communicated with the buffer zone 13, and the liquid outlet 6 is communicated with the autotrophic reaction zone 14; the axial line of the liquid inlet I8 is 1.5cm away from the lower surface of the reactor; the axial line of the liquid outlet 6 is 2.0cm away from the upper surface of the reactor; the heterotrophic reaction zone 12 and the autotrophic reaction zone 14 are respectively provided with a stirrer, the stirrer comprises a stirring motor 4 and a stirring paddle 9, the stirring speed is 20r/min, the lower part of the stirring paddle 9 is 8.0cm away from the bottom of the reactor, and the loss of activated sludge caused by the weakened sludge settling performance at the upper part of the reactor due to stirring is prevented; inclined baffles 11 are respectively fixed on two sides of the inner walls of the heterotrophic reaction zone 12 and the autotrophic reaction zone 14, the inclined angle of the inclined baffles 11 in the horizontal direction is 60 degrees, the vertical height is 10.0cm, and the bottom of each inclined baffle 11 is 1.0cm away from the inner wall of the device in the horizontal direction; the cooperative treatment device also comprises a liquid inlet box I7 and a liquid inlet box II 1, wherein liquid in the liquid inlet box I7 flows into a liquid inlet I8 through a water pump I5, liquid in the liquid inlet box II 1 flows into a liquid inlet II 2 through a water pump II 15, and the water pump in the embodiment adopts a peristaltic pump; the cooperative treatment device also comprises a liquid outlet box 10, wherein a sludge filling port I18 is arranged at one side of the top of the reactor shell, which corresponds to the heterotrophic reaction zone 12, and a sludge filling port II 19 is arranged at one side of the reactor shell, which corresponds to the autotrophic reaction zone 14; the liquid inlet box I7 is connected with a water outlet pipe of the ship waste gas desulfurization washing waste liquid and a water outlet pipe of the ship domestic sewage, and the liquid inlet box II 1 is connected with a water outlet pipe of the ship waste gas denitration washing waste liquid; the water pump may also be replaced with a peristaltic pump.
The method for the cooperative treatment of the ship waste gas washing waste liquid and the ship domestic sewage comprises the following steps:
(1) domesticating activated sludge: inoculating anaerobic activated sludge taken from an anaerobic fermentation tank of a Dalian summer family river sewage treatment plant into a continuous stirring reactor, wherein the acclimation conditions of the heterotrophic activated sludge are as follows: SO (SO)4 2-The concentration is 900mg/L calculated by S, the protein organic matter is 270mg/L calculated by N, the pH value is 7.6, the water is continuously fed, the hydraulic retention time is 24 hours, the set temperature is 35 +/-0.5 ℃, and the stirring speed is 15 r/min. When SO4 2-The removal rate is more than 90 percent, S2-The production rate reaches more than 70 percent, and the heterotrophic activated sludge mainly contains sulfate reducing bacteriaAcclimation was complete, see fig. 2. Simultaneously, inoculating anaerobic activated sludge taken from an anaerobic fermentation tank of a Dalian Xia family river sewage treatment plant into another independent continuous stirring reactor, wherein the domestication conditions of the autotrophic activated sludge are as follows: SO (SO)4 2-The concentration is 900mg/L in terms of S, S2-The concentration is 200mg/L in terms of S, NH4 +160mg/L calculated by N, NO2 -The concentration is 250mg/L calculated by N, the pH value is 7.6, the water is continuously fed, the hydraulic retention time is 24 hours, the set temperature is 35 +/-0.5 ℃, and the stirring speed is 15 r/min. When NO is present2 -And S2-The removal rate of the catalyst respectively reaches more than 90 percent, NH4 +When the removal rate of-N reaches more than 70%, acclimatization of autotrophic desulfurization denitrifying bacteria and anaerobic ammonium oxidation bacteria is completed, as shown in figure 3. Wherein, the artificial water distribution components during the acclimation of the heterotrophic activated sludge comprise natural pure seawater, peptone and NaHCO3(ii) a The artificial water distribution component for the acclimation of the autotrophic denitrification activated sludge is natural clean seawater and NaNO2、Na2S、NH4Cl and NaHCO3。
(2) And respectively inoculating the domesticated heterotrophic activated sludge and the autotrophic activated sludge into a heterotrophic reaction zone and an autotrophic reaction zone of the reaction device. The operating conditions of the heterotrophic reaction zone are as follows: the concentration of heterotrophic activated sludge in the reactor is 30.5g MLVSS/L, SO4 2-The concentration is 900mg/L calculated by S, the organic matter is 270mg/L calculated by N, the pH value is 7.6, the stirring speed is 15r/min, continuous flow water inflow is carried out, and the hydraulic retention time is 24 hours; SO (SO)4 2-And the concentration and the pH value of the organic matters are controlled by adjusting the relative volumes of the waste gas desulfurization washing waste liquid, the domestic sewage and the seawater which enter the water inlet tank I. The operating conditions of the autotrophic reaction zone are as follows: the concentration of autotrophic activated sludge in the reactor is 32.3g of MLVSS/L, and NO in inlet water2 -200mg/L calculated by N, 7.6 of pH value, 15r/min of stirring speed, continuous flow water inflow and 24h of hydraulic retention time; NO2 -The concentration and the pH value of the waste gas are controlled by adjusting the relative volume of the waste gas denitration washing waste liquid and the seawater which enter the water inlet tank II.
(3) The treatment process comprises the following steps: the method comprises the following steps of putting ship waste gas desulfurization washing waste liquid and ship domestic sewage into a liquid inlet box I7, enabling the ship waste gas desulfurization washing waste liquid and the ship domestic sewage to enter a heterotrophic reaction zone 12 from a liquid inlet I8 at the bottom end of a reactor through a water pump I5, fully mixing the ship waste gas desulfurization washing waste liquid and the ship domestic sewage with heterotrophic activated sludge mainly comprising sulfate reducing bacteria under the action of a stirrer to generate a sulfate reduction reaction and a degradation reaction of organic matters mainly comprising protein, and blocking the sludge at the lower part of an inclined baffle under the action of the inclined baffle 11 to realize sludge-water separation; the treated water overflows to a buffer zone 13 from an overflow port 16 at the upper part of a heterotrophic reaction zone 12, meanwhile, the ship waste gas denitration washing waste liquid 1 in a liquid inlet box II 1 is pumped into a liquid inlet II 2 through a water pump II 15 and flows into the buffer zone 13, the ship waste gas denitration washing waste liquid and the effluent of the heterotrophic reaction zone 12 enter an autotrophic reaction zone 14 from the bottom of the buffer zone 13, the ship waste gas denitration washing waste liquid and the autotrophic activated sludge mainly containing autotrophic desulfurization denitrifying bacteria and anaerobic ammonium oxidation bacteria are fully mixed under the action of a stirrer to generate a combined reaction of autotrophic desulfurization denitrification and anaerobic ammonium oxidation, mud and water are separated under the action of an inclined baffle plate 11, and the treated water is discharged from a liquid outlet 6 at the upper part of the autotrophic reaction zone and flows into a water outlet box 10.
Sulfate reduction reaction mainly occurs in the heterotrophic reaction zone, protein organic matters in the domestic sewage can help sulfate reducing bacteria resist the inhibition of high-salt environment, the starting time is shortened, sulfate and organic matters are efficiently converted into sulfide and carbon dioxide, and the protein organic matters release ammonia nitrogen. In the autotrophic reaction zone, desulfurization denitrification and anaerobic ammonia oxidation reactions mainly occur, nitrite can perform autotrophic reaction with a large amount of ammonia nitrogen and sulfide generated in the previous zone, and the nitrite is finally converted into nitrogen, and the sulfide is finally converted into elemental sulfur to be thoroughly removed from the reaction system.
SO in the heterotrophic reaction zone in this embodiment4 2-Removal effect of (1), NH4 +-N、S2-The production effect was monitored separately and the results are shown in FIG. 4, SO4 2-The removal rate of the catalyst can reach more than 95 percent, and S2-The generation rate of the catalyst can reach more than 70 percent, NH4 +The maximum concentration of-N is 560 mg/L. NO to autotrophic reaction zone2-、S2-、NH4 +The removal effect of-N is also monitored separately,the results are shown in FIG. 5, NO2 -、S2-、NH4 +The removal rates of-N can reach more than 95%, 95% and 90% respectively. The treatment effect is stable during the operation, and the shock load resistance of the reaction system is strong.
Example 2
The embodiment provides a device and a method for the cooperative treatment of ship waste gas washing waste liquid and ship domestic sewage. The cooperative treatment device comprises a reactor shell 17, wherein a liquid inlet I8, a liquid inlet II 2 and a liquid outlet 6 are arranged on the reactor shell 17, a heterotrophic reaction zone 12, a buffer zone 13 and an autotrophic reaction zone 14 which are sequentially communicated are arranged in the reactor shell 17, the volumes of the heterotrophic reaction zone 12 and the autotrophic reaction zone 14 are the same, an overflow port 16 is arranged at the upper part of the heterotrophic reaction zone 12 and communicated with the buffer zone 13, the vertical height of the overflow port 16 is 1.5cm, the lower part of the buffer zone 13 is communicated with the autotrophic reaction zone 14, and air outlet holes 3 are arranged at the upper ends of the heterotrophic reaction zone 12 and the autotrophic reaction zone 14; the liquid inlet I8 is communicated with the heterotrophic reaction zone 12, the liquid inlet II 2 is communicated with the buffer zone 13, and the liquid outlet 6 is communicated with the autotrophic reaction zone 14; the axial line of the liquid inlet I8 is 1.5cm away from the lower surface of the reactor; the axial line of the liquid outlet 6 is 2.0cm away from the upper surface of the reactor; the heterotrophic reaction zone 12 and the autotrophic reaction zone 14 are respectively provided with a stirrer, the stirrer comprises a stirring motor 4 and a stirring paddle 9, the stirring speed is 15r/min, the lower part of the stirring paddle 9 is 5.0cm away from the bottom of the reactor, and the loss of activated sludge caused by the weakened sludge settling performance at the upper part of the reactor due to stirring is prevented; inclined baffles 11 are respectively fixed on two sides of the inner walls of the heterotrophic reaction zone 12 and the autotrophic reaction zone 14, the inclined angle of the inclined baffles 11 in the horizontal direction is 50 degrees, the vertical height is 15.0cm, and the bottom of each inclined baffle 11 is 1.5cm away from the inner wall of the device in the horizontal direction; the cooperative treatment device also comprises a liquid inlet box I7 and a liquid inlet box II 1, wherein liquid in the liquid inlet box I7 flows into a liquid inlet I8 through a water pump I5, liquid in the liquid inlet box II 1 flows into a liquid inlet II 2 through a water pump II 15, and the water pump uses a metering pump in the embodiment; (ii) a The cooperative treatment device also comprises a liquid outlet box 10, one side of the top of the reactor shell, which corresponds to the heterotrophic reaction zone 12, is provided with a sludge filling port I18, and one side, which corresponds to the autotrophic reaction zone 14, is provided with a sludge filling port II 19; (ii) a The liquid inlet box I7 is connected with a water outlet pipe of the ship waste gas desulfurization washing waste liquid and a water outlet pipe of the ship domestic sewage, and the liquid inlet box II 1 is connected with a water outlet pipe of the ship waste gas denitration washing waste liquid; the metering pump can also be replaced by a peristaltic pump.
The method for the cooperative treatment of the ship waste gas washing waste liquid and the ship domestic sewage comprises the following steps:
(1) domesticating activated sludge: anaerobic activated sludge taken from an anaerobic fermentation tank of a Dalian summer family river sewage treatment plant is put into a continuous stirring reactor, and the acclimatization conditions of the heterotrophic activated sludge are as follows: SO (SO)4 2-The concentration is 900mg/L by S, the organic matter is 310mg/L by N, the pH value is 7.8, the hydraulic retention time is 18h when continuous flow water inflow is carried out, the set temperature is 35 +/-0.5 ℃, and the stirring speed is 20 r/min. When SO4 2-The removal rate reaches more than 90 percent, the generation rate of sulfides reaches more than 70 percent, and the acclimatization of heterotrophic activated sludge mainly containing sulfate reducing bacteria is completed. Meanwhile, inoculating anaerobic activated sludge taken from an anaerobic fermentation tank of a Dalian Xia family river sewage treatment plant into another continuous stirring reactor, wherein the domestication conditions of the autotrophic activated sludge are as follows: SO (SO)4 2-The concentration is 900mg/L in terms of S, S2-The concentration is 250mg/L calculated by S, NH4 +160mg/L calculated by N, NO2 -The concentration is 200mg/L calculated by N, the pH value is 7.8, the hydraulic retention time is 18h when continuous flow water is fed, the set temperature is 35 +/-0.5 ℃, and the stirring speed is 20 r/min. When NO is present2 -And S2-The removal rate of the catalyst respectively reaches more than 90 percent, NH4 +When the removal rate of-N reaches more than 70%, the acclimation of the autotrophic desulfurization denitrifying bacteria and anaerobic ammonium oxidation bacteria is completed. Wherein, the artificial water distribution components during the acclimation of the heterotrophic activated sludge comprise natural pure seawater, peptone and NaHCO3(ii) a The artificial water distribution component for the acclimation of the autotrophic denitrification activated sludge is natural clean seawater and NaNO2、Na2S、NH4Cl and NaHCO3。
(2) And respectively inoculating the domesticated heterotrophic activated sludge and the autotrophic activated sludge into a heterotrophic reaction zone and an autotrophic reaction zone of the reaction device. The operating conditions of the heterotrophic reaction zone are as follows: heterotrophic activated sludge concentration in the reactor27.6g MLVSS/L, SO4 2-The concentration is 920mg/L calculated by S, the organic matter is 310mg/L calculated by N, the pH value is 7.8, the stirring speed is 20r/min, continuous flow water inflow is carried out, and the hydraulic retention time is 18 h; SO (SO)4 2-And the concentration and the pH value of the organic matters are controlled by adjusting the relative volumes of the waste gas desulfurization washing waste liquid, the domestic sewage and the seawater which enter the water inlet tank I. The operating conditions of the autotrophic reaction zone are as follows: the concentration of autotrophic activated sludge in the reactor is 31.7g of MLVSS/L, and NO in inlet water2 -200mg/L calculated by N, 7.8 of pH value, 20r/min of stirring speed, continuous flow water inflow and 18h of hydraulic retention time; NO2 -The concentration and the pH value of the waste gas are controlled by adjusting the relative volume of the waste gas denitration washing waste liquid and the seawater which enter the water inlet tank II.
(3) The treatment process comprises the following steps: the method comprises the following steps of putting ship waste gas desulfurization washing waste liquid and ship domestic sewage into a liquid inlet box I7, enabling the ship waste gas desulfurization washing waste liquid and the ship domestic sewage to enter a heterotrophic reaction zone 12 from a liquid inlet I8 at the bottom end of a reactor through a water pump I5, fully mixing the ship waste gas desulfurization washing waste liquid and the ship domestic sewage with heterotrophic activated sludge mainly containing sulfate reducing bacteria under the action of a stirrer to generate a sulfate reduction reaction and a degradation reaction of organic matters mainly containing protein, and separating mud from water under the action of an inclined baffle plate 11; the treated water overflows to a buffer zone 13 from an overflow port 16 at the upper part of a heterotrophic reaction zone 12, meanwhile, the ship waste gas denitration washing waste liquid 1 in a liquid inlet box II 1 is pumped into a liquid inlet II 2 through a water pump II 15 and flows into the buffer zone 13, and enters an autotrophic reaction zone 14 from the bottom of the buffer zone 13 together with the outlet water of the heterotrophic reaction zone 12, and is fully mixed with autotrophic activated sludge mainly comprising autotrophic desulfurization denitrifying bacteria and anaerobic ammonium oxidation bacteria under the action of a stirrer to generate a combined reaction of autotrophic desulfurization denitrification and anaerobic ammonium oxidation, the sludge is blocked at the lower part of an inclined baffle plate under the action of the inclined baffle plate 11 to realize mud-water separation, and the treated water is discharged from a liquid outlet 6 at the upper part of the autotrophic reaction zone and flows into a water outlet box 10.
Sulfate reduction reaction mainly occurs in the heterotrophic reaction zone, protein organic matters in the domestic sewage can help sulfate reducing bacteria resist the inhibition of high-salt environment, the starting time is shortened, and simultaneously sulfate and organic matters are efficiently converted into sulfide, carbon dioxide and eggsThe white matter organic matter releases ammonia nitrogen. In the autotrophic reaction zone, desulfurization denitrification and anaerobic ammonia oxidation reactions mainly occur, nitrite can perform autotrophic reaction with a large amount of ammonia nitrogen and sulfide generated in the previous zone, and the nitrite is finally converted into nitrogen, and the sulfide is finally converted into elemental sulfur to be thoroughly removed from the reaction system. SO in the heterotrophic reaction zone in this embodiment4 2-Removal effect of (1), NH4 +-N、S2-The production effect was monitored separately, and the results are shown in FIG. 6, SO4 2-The removal rate of the catalyst can reach more than 80 percent, and S2-The generation rate of the catalyst can reach more than 60 percent, NH4 +The maximum concentration of-N is 520 mg/L. NO to autotrophic reaction zone2 -、S2-、NH4 +The N removal was also monitored separately and the results are shown in FIG. 7, NO2 -、S2-、NH4 +The removal rates of-N can reach more than 80%, 80% and 70% respectively. The treatment effect was stable during the operation, but the reaction system had a slightly weaker impact load resistance than that of example 1.
It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (7)
1. A cooperative treatment device for ship waste gas washing waste liquid and ship domestic sewage is characterized by comprising a reactor shell (17), wherein a liquid inlet I (8), a liquid inlet II (2) and a liquid outlet (6) are formed in the reactor shell (17), a heterotrophic reaction zone (12), a buffer zone (13) and an autotrophic reaction zone (14) which are sequentially communicated are arranged in the reactor shell (17), the liquid inlet I (8) is communicated with the heterotrophic reaction zone (12), the liquid inlet II (2) is communicated with the buffer zone (13), and the liquid outlet (6) is communicated with the autotrophic reaction zone (14); stirrers are respectively arranged in the heterotrophic reaction zone (12) and the autotrophic reaction zone (14); inclined baffles (11) are respectively fixed on two sides of the inner wall of the heterotrophic reaction zone (12) and the autotrophic reaction zone (14); the synergistic treatment device also comprises a liquid inlet box I (7) and a liquid inlet box II (1), wherein liquid in the liquid inlet box I (7) flows into the liquid inlet I (8) through a water pump I (5), and liquid in the liquid inlet box II (1) flows into the liquid inlet II (2) through a water pump II (15); the upper ends of the heterotrophic reaction zone (12) and the autotrophic reaction zone (14) are provided with air outlet holes (3); a sludge filling port I (18) is arranged at one side of the top of the reactor shell, which corresponds to the heterotrophic reaction zone (12), and a sludge filling port II (19) is arranged at one side of the reactor shell, which corresponds to the autotrophic reaction zone (14);
the liquid inlet I (8) is filled with ship waste gas desulfurization washing waste liquid and ship domestic sewage;
the liquid inlet II (2) is filled with the ship waste gas denitration washing waste liquid;
the upper part of the heterotrophic reaction zone (12) is provided with an overflow port (16) which is communicated with the buffer zone (13), and the lower part of the buffer zone (13) is communicated with the autotrophic reaction zone (14); the vertical height of the overflow port (16) is 1.0-2.0 cm; the distance between the central axis of the liquid inlet I (8) and the lower surface of the reactor is 1.0-2.0 cm; the axial line of the liquid outlet (6) is 1.0-2.5cm away from the upper surface of the reactor;
the inclined angle of the inclined baffle (11) in the horizontal direction is 50-60 degrees, the vertical height is 10-15cm, and the interval between the bottom of the inclined baffle (11) and the inner wall of the device in the horizontal direction is 0.5-1.5 cm;
the stirrer comprises a stirring motor (4) and a stirring paddle (9), and the lower part of the stirring paddle (9) is 5.0-8.0cm away from the bottom of the reactor.
2. The device for the co-treatment of the marine vessel waste gas washing liquid and the marine vessel domestic sewage according to claim 1, wherein the co-treatment device further comprises a water outlet tank (10).
3. A method for the cooperative treatment of waste washing liquid of exhaust gas of a marine diesel engine and marine domestic sewage is characterized by comprising the following steps:
inoculating heterotrophic activated sludge into a heterotrophic reaction zone (12), and inoculating autotrophic denitrification activated sludge into an autotrophic reaction zone (14); the method comprises the following steps of putting ship waste gas desulfurization washing waste liquid and ship domestic sewage into a liquid inlet box I (7), enabling the ship waste gas desulfurization washing waste liquid and the ship domestic sewage to enter a heterotrophic reaction zone (12) from a liquid inlet I (8) at the bottom end of a reactor shell (17) through a water pump I (5), fully mixing the ship waste gas desulfurization washing waste liquid and the ship domestic sewage with heterotrophic activated sludge under the action of a stirrer to generate sulfate reduction reaction and degradation reaction of organic matters mainly containing protein, and separating mud and water under the action of an inclined baffle (11); the treated water overflows to a buffer area (13) from an overflow port (16) at the upper part of a heterotrophic reaction area (12), meanwhile, the ship waste gas denitration washing waste liquid in a liquid inlet box II (1) is pumped into a liquid inlet II (2) through a water pump II (15) to flow into the buffer area (13), and enters an autotrophic reaction area (14) together with the effluent of the heterotrophic reaction area (12) from the bottom of the buffer area (13), and is fully mixed with autotrophic denitrification active sludge under the action of a stirrer to generate the combined reaction of autotrophic desulfurization denitrification and anaerobic ammonia oxidation, the mud and water are separated under the action of an inclined baffle plate (11), and the treated water is discharged from a liquid outlet (6) at the upper part of the autotrophic reaction area.
4. The method for the synergistic treatment of the marine diesel engine exhaust gas washing waste liquid and the marine domestic sewage according to claim 3,
the heterotrophic activated sludge is domesticated heterotrophic activated sludge, and the domestication method of the heterotrophic activated sludge comprises the following steps: anaerobic activated sludge is put into a continuous stirring reactor, mixed wastewater of ship flue gas desulfurization washing waste liquid and ship domestic sewage is introduced, a continuous water inlet mode is adopted, the temperature in the reactor is set to be 25-35 ℃, the stirring speed is 15-25r/min, the hydraulic retention time is 8-36h, and SO is added4 2-The concentration is 900-1000mg/L in terms of S, the organic matter is 250-310mg/L in terms of N, the pH value is 7.0-7.8, the hydraulic retention time is 8-36h when SO4 2-When the removal rate reaches more than 90 percent and the sulfide generation rate reaches more than 70 percent, the acclimation of the heterotrophic activated sludge mainly containing sulfate reducing bacteria is completed;
the autotrophic denitrification activated sludge is domesticated autotrophic denitrification activated sludge, and the domestication method of the autotrophic denitrification activated sludge comprises the following steps: anaerobic activated sludge is put into a continuous stirring reactor, and artificial simulated anaerobic sludge is introducedThe mixed liquid of the treated ship desulfurization waste liquid, the effluent of the domestic sewage and the ship waste gas denitration washing waste liquid adopts a continuous water inlet mode, the temperature in the reactor is set to be 25-35 ℃, the stirring speed is 15-25r/min, and S is in the inlet water2-The concentration is 250-300mg/L in terms of S, NO2 -200-300mg/L, NH calculated by N4 +150 mg/L in terms of N, and the hydraulic retention time is 8-36h when NO is measured2 -And S2-The removal rate of the catalyst respectively reaches more than 90 percent, NH4 +When the removal rate of N reaches more than 70 percent, acclimating autotrophic denitrification activated sludge mainly comprising autotrophic desulfurization denitrifying bacteria and anaerobic ammonium oxidation bacteria;
the anaerobic activated sludge is taken from an anaerobic treatment device.
5. The method according to claim 4, wherein the acclimatization of the heterotrophic activated sludge is performed by artificial water distribution, and the artificial water distribution comprises natural clean seawater, peptone and NaHCO3(ii) a The domestication of the autotrophic denitrification activated sludge adopts artificial water distribution, and the artificial water distribution comprises natural clean seawater and NaNO2、Na2S、NH4Cl and NaHCO3。
6. The method for the synergistic treatment of the marine diesel engine exhaust gas washing waste liquid and the marine domestic sewage according to claim 3,
the inoculation concentration of the heterotrophic activated sludge inoculated into the heterotrophic reaction zone (12) is as follows: 20-40 gMLVSS/L;
the inoculation concentration of the autotrophic denitrification activated sludge inoculated to the autotrophic reaction zone (14) is as follows: 25-45 gMLVSS/L.
7. The method for the synergistic treatment of the marine diesel engine exhaust gas washing waste liquid and the marine domestic sewage according to claim 3, wherein the operation conditions of the heterotrophic reaction zone (12) are as follows: SO (SO)4 2-The concentration is 900-1000mg/L in terms of S, the concentration is 270-310mg/L in terms of N,the pH value is 7.0-7.8, the stirring speed is 10-20r/min, continuous flow water inflow is carried out, and the hydraulic retention time is 8-36 h;
the operating conditions of the autotrophic reaction zone (14) are as follows: NO in influent water2 -200mg/L calculated by N, the pH value is 7.0-7.8, the stirring speed is 10-20r/min, continuous flow water inflow is carried out, and the hydraulic retention time is 8-36 h.
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