CN106554109B - Pretreatment system and method for household garbage pyrolysis condensation wastewater - Google Patents
Pretreatment system and method for household garbage pyrolysis condensation wastewater Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention relates to the field of wastewater treatment, in particular to a pretreatment system and a pretreatment method for household garbage pyrolysis condensation wastewater. The processing system comprises: the circulating adsorption oxidation tower is provided with a water inlet, a first water outlet, a second water outlet, a water distribution packing layer and a pyrolytic carbon packing layer; an oil removal and sedimentation system; the conveying device is used for conveying the pyrolysis condensation wastewater to the circulating adsorption oxidation tower; an oxidant addition system for adding an oxidant; a pH adjusting section for adjusting pH; and the ammonia stripping tower is used for carrying out stripping treatment. According to the pretreatment system and method for the household garbage pyrolysis condensation wastewater, the characteristics that pyrolysis condensation water is acidic and has high temperature are fully utilized, the pyrolysis condensation wastewater is treated by the pyrolytic carbon, waste is made by waste, and the saturated pyrolytic carbon is recycled for pyrolysis, so that secondary pollution is avoided, the total soluble solid content of the wastewater is not increased, and sludge is not generated; the cost is lower, the control is simple, and the effect of improving the biodegradability is good.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a pretreatment system and a pretreatment method for household garbage pyrolysis condensation wastewater.
Background
In the stage of condensing and collecting pyrolysis gas in the pyrolysis treatment process of the RDF, moisture contained in the material and reaction water generated by pyrolysis are condensed together with high and medium boiling point components in the pyrolysis gas and enter pyrolysis liquid to form an oil-water mixture; and after the pyrolysis oil is obtained through oil-water separation, the rest is the pyrolysis condensation wastewater needing to be treated.
Because pyrolysis condensation waste water mainly comes from moisture and the reaction water that produces in the thermal decomposition process when domestic waste RDF gets into the pyrolysis oven, and the pyrolysis is a decomposition reaction under the anaerobic condition again, so pyrolysis waste water has that the composition is complicated, high ammonia nitrogen, high volatile phenol, high surfactant agent, and contain characteristics such as heavy metal, is a high concentration, has biotoxic organic waste water, main pollutant kind and the quality of water scope in the pyrolysis condensation waste water are in following the table:
therefore, the domestic garbage RDF pyrolysis condensed wastewater has extremely bad influence on the environment if not treated, or can influence the normal operation of the subsequent conventional biochemical treatment steps. However, there is no effective method for the above-mentioned pyrolysis condensation wastewater treatment.
Disclosure of Invention
The invention aims to provide a pretreatment system and a pretreatment method which are more effective for domestic garbage RDF pyrolysis condensation wastewater.
The technical scheme of the invention is as follows:
a domestic waste pyrolysis condensation pretreatment of water system includes:
the circulating adsorption oxidation tower comprises a tower body, a water inlet, a first water outlet and a second water outlet, wherein the water inlet is arranged on the side surface of the tower body, the first water outlet is arranged at the bottom of the tower body, the second water outlet is arranged at the position, higher than the water inlet, on the side surface of the tower body, at least one water distribution packing layer and at least one pyrolytic carbon packing layer are arranged inside the tower body between the water inlet and the second water outlet, and the pyrolytic carbon packing is filled inside the water distribution packing layer;
the oil removal and precipitation system is used for carrying out oil removal and precipitation treatment on the pyrolysis and condensation wastewater;
the conveying device is used for conveying the pyrolysis condensation wastewater subjected to the oil separation and precipitation treatment to a water inlet of the circulating adsorption oxidation tower and also used for conveying the pyrolysis condensation wastewater with a preset volume flowing out of a first water outlet of the circulating adsorption oxidation tower to the water inlet again;
the oxidizing agent adding system is used for adding a preset amount of oxidizing agent into the pyrolysis condensation wastewater flowing out of the first water outlet;
the PH adjusting section is used for adjusting the PH of the pyrolysis condensation wastewater flowing out of the second water outlet of the circulating adsorption oxidation tower;
and the ammonia stripping tower is used for carrying out stripping treatment on the pyrolysis condensation wastewater subjected to the PH adjustment.
Optionally, each water distribution filler layer and each pyrolytic carbon filler layer are distributed at intervals from bottom to top.
Optionally, the delivery device is a high-pressure pump, preferably a high-pressure corrosion-resistant centrifugal pump.
Optionally, the oxidant is hydrogen peroxide.
Optionally, the oxidant adding system includes a metering pump, a drug storage barrel, an automatic control device, and the like.
The invention also provides a treatment method of the domestic garbage pyrolysis condensation wastewater pretreatment system, which comprises the following steps:
carrying out oil removal and precipitation treatment on pyrolysis condensation wastewater through an oil removal and precipitation system;
step two, adjusting the temperature and the pressure in the circulating adsorption oxidation tower to a preset temperature and a preset pressure respectively;
thirdly, conveying the pyrolysis condensed wastewater subjected to the oil separation precipitation treatment to the interior of the circulating adsorption oxidation tower from a water inlet through a conveying device;
step four, in the pyrolysis condensation wastewater entering the circulating adsorption oxidation tower, enabling a preset percentage of the pyrolysis condensation wastewater to flow out from a second water outlet of the circulating adsorption oxidation tower, and enabling the remaining percentage of the pyrolysis condensation wastewater to flow out from a first water outlet of the circulating adsorption oxidation tower;
fifthly, adding a predetermined amount of oxidant into the pyrolysis condensation wastewater flowing out of the first water outlet through an oxidant adding system;
sixthly, the pyrolysis condensation wastewater added with the oxidant is conveyed to the interior of the circulating adsorption oxidation tower again through the conveying device;
step seven, the pyrolysis condensation wastewater in the step six is conveyed back to the interior of the cyclic adsorption oxidation tower again, and then flows out from the first water outlet, is added with a predetermined amount of oxidant and is conveyed back to the interior of the cyclic adsorption oxidation tower again in sequence;
step eight, after the circulation step in the step seven is circulated for a preset number of times, the pyrolysis condensation wastewater in the circulation adsorption oxidation tower flows out through a second water outlet;
step nine, carrying out pH adjustment on the pyrolysis condensation wastewater flowing out from the second water outlet in the step four or the step eight through a pH adjustment section;
and step ten, carrying out stripping treatment on the pyrolysis condensation wastewater subjected to the PH regulation through an ammonia stripping tower.
Optionally, in the second step, the predetermined temperature of the cyclic adsorption oxidation tower is not less than 45 ℃, and the predetermined pressure is not less than 0.5 MPa.
Optionally, in the fourth step, the water yield from the second water outlet of the cyclic adsorption oxidation tower accounts for 5% -20% of the total cyclic water yield.
Optionally, the oxidant in the fifth step is hydrogen peroxide, and the mass ratio of the hydrogen peroxide to the Chemical Oxygen Demand (COD) is 0.1-0.5.
Optionally, in the ninth step, the PH value ranges from 2 to 5.
The invention has the following effects:
according to the pretreatment system and method for the household garbage pyrolysis condensation wastewater, the characteristics that pyrolysis condensation water is acidic and has high temperature are fully utilized, the pyrolysis condensation wastewater is treated by the pyrolytic carbon, waste is made by waste, and the saturated pyrolytic carbon is recycled for pyrolysis, so that secondary pollution is avoided, the total soluble solid content of the wastewater is not increased, and sludge is not generated; the invention has the advantages of low cost, simple control, good biochemical improvement effect, automatic control and low labor intensity.
Drawings
FIG. 1 is a schematic structural diagram of a circulating adsorption oxidation tower in the domestic waste pyrolysis and condensation wastewater pretreatment system and method;
FIG. 2 is a flow chart of the pretreatment method of domestic waste pyrolysis condensation wastewater.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.
The pretreatment system and method for domestic waste pyrolysis condensation wastewater of the present invention will be described in further detail with reference to fig. 1 and 2.
The invention provides a domestic garbage pyrolysis condensation wastewater pretreatment system which comprises a cyclic adsorption oxidation tower 1, an oil separation and precipitation system, a conveying device, an oxidant adding system, a pH adjusting section and an ammonia stripping tower.
The cyclic adsorption oxidation tower 1 may include a tower body 11, a water inlet 12, a first water outlet 13, and a second water outlet 14. Specifically, the water inlet 12 is opened at a side surface of the tower body 11; the first water outlet 13 is arranged at the bottom of the tower body 11; the second water outlet 14 is opened at a position higher than the water inlet 12 at a side of the tower body 11; in addition, at least one water distribution packing layer 15 and at least one pyrolytic carbon packing layer 16 are disposed inside the tower body 11 between the water inlet 12 and the second water outlet 14, and the inside of the water distribution packing layer 15 is filled with pyrolytic carbon packing, and preferably, the pyrolytic carbon packing has a single-layer structure. The arrangement positions and the number of the water distribution packing layer 15 and the pyrolytic carbon packing layer 16 can be selected suitably according to actual treatment requirements, in the embodiment, each layer of the water distribution packing layer 15 and each layer of the pyrolytic carbon packing layer 16 are distributed at intervals from bottom to top, and preferably comprises two layers of the water distribution packing layer 15 and two layers of the pyrolytic carbon packing layer 16.
The oil removal and precipitation system is used for carrying out oil removal and precipitation treatment on the pyrolysis and condensation wastewater so as to reduce the content of oil stains in the pyrolysis and condensation wastewater; the oil separation settling system may be any of various known suitable oil separation settling devices, and this embodiment is not described in detail.
The conveying device is used for conveying the pyrolysis condensed wastewater subjected to the oil separation and precipitation treatment to the water inlet 12 of the circulating adsorption oxidation tower 1, and can also convey a predetermined volume of pyrolysis condensed wastewater flowing out of the first water outlet 13 of the circulating adsorption oxidation tower 1 to the water inlet 12 again. Wherein, the conveying device can adopt various suitable liquid conveying devices, such as a power type pump, a positive displacement pump and the like; in this embodiment, a high-pressure corrosion-resistant centrifugal pump with high efficiency is preferred, and the high-pressure pump can be set to be opened and closed manually or automatically controlled by a controller according to needs.
The oxidant adding system is used for adding a predetermined amount of oxidant into the pyrolysis condensation wastewater flowing out of the first water outlet 13; wherein, the oxidant and the adjusting equipment thereof can be properly selected according to the requirement; in the embodiment, hydrogen peroxide is preferably selected as the oxidant, and a metering pump is preferably adopted for adding, so that the operation is more convenient and faster and is accurate; in addition, the oxidant adding system may also include a medicine storage barrel and an automatic control device structure, which are not described herein again.
The PH adjusting section is arranged between the second water outlet 14 of the circulating adsorption oxidation tower 1 and the ammonia stripping tower, and aims to adjust the PH of the pyrolysis condensation wastewater flowing out from the second water outlet 14 of the circulating adsorption oxidation tower 1, and the adjusting mode can adopt various known suitable modes and can also be set to be manual adjustment or automatic adjustment according to the needs.
The ammonia stripping tower is used for carrying out stripping treatment on the pyrolysis condensation wastewater subjected to PH adjustment; the ammonia stripping column may also adopt various known ammonia stripping column structures, and the details are not described herein.
The pretreatment system for the domestic garbage pyrolysis condensation wastewater can fully utilize the characteristics of slightly acidic pyrolysis condensation water and high temperature, adopts the pyrolysis carbon in the cyclic adsorption oxidation tower 1 to treat the pyrolysis condensation wastewater, realizes waste treatment by waste, can perform circular pyrolysis by returning saturated pyrolysis carbon to a furnace, does not generate secondary pollution, does not increase the Total Dissolved Solids (TDS) content of the wastewater, and does not generate sludge; and the cost is lower, the control is simple, the effect of improving the biodegradability is good, and high automatic control can be realized according to the requirement so as to reduce the labor intensity.
The invention also provides a pretreatment method of the domestic garbage pyrolysis condensation wastewater, which comprises the following steps:
and S101, carrying out oil separation precipitation treatment on the pyrolysis condensation wastewater through an oil separation precipitation system to reduce the content of oil stains in the pyrolysis condensation wastewater.
Step S102, adjusting the temperature and the pressure in the circulating adsorption oxidation tower 1 to a preset temperature and a preset pressure respectively; in this embodiment, the preset temperature of the cyclic adsorption oxidation tower 1 is preferably not less than 45 ℃ and the preset pressure is not less than 0.5MPa, so that the internal catalytic oxidation efficiency of the post-cyclic adsorption oxidation tower 1 can be improved under the condition of medium-temperature pressurization. It should be noted that, a temperature adjusting device and a pressure adjusting device may be correspondingly disposed inside the cyclic adsorption oxidation tower 1, and the specific temperature adjusting device and the pressure adjusting device may be various known suitable devices, and many types of oxidation towers have such structures at present, and therefore, the detailed description thereof is omitted here.
Step S103, conveying the pyrolysis condensed wastewater subjected to oil removal and precipitation treatment to the interior of the circulating adsorption oxidation tower 1 from the water inlet 12 through a conveying device; specifically, the waste water is conveyed by a high-pressure pump, and due to the water distribution packing layer 15 and the pyrolytic carbon packing layer 16 inside the cyclic adsorption oxidation tower 1, the pyrolytic condensed waste water entering the cyclic adsorption oxidation tower 1 is treated by pyrolytic carbon, and the specific treatment mode and principle will be described in detail later.
Step S104, in step S103, in the whole pyrolysis condensation wastewater entering the interior of the cyclic adsorption oxidation tower 1, a predetermined percentage of the pyrolysis condensation wastewater is made to flow out from the second water outlet 14 of the cyclic adsorption oxidation tower 1, and then the remaining percentage of the pyrolysis condensation wastewater is made to flow out from the first water outlet 13 of the cyclic adsorption oxidation tower; in this embodiment, the water yield (pyrolysis condensation wastewater) from the second water outlet 14 of the cyclic adsorption oxidation tower 1 is preferably 5% to 20% of the total circulating water yield, that is, the pyrolysis condensation wastewater flowing out from the first water outlet 13 is 80% to 95% of the total circulating water yield.
Step S105, adding a predetermined amount of oxidant into the pyrolysis condensation wastewater flowing out of the first water outlet 13 through an oxidant adding system; specifically, hydrogen peroxide is added through a metering pump, and the mass ratio of the hydrogen peroxide to Chemical Oxygen Demand (COD) is preferably 0.1-0.5.
And S106, re-conveying the pyrolysis condensation wastewater added with the oxidant to the interior of the circulating adsorption oxidation tower 1 through a high-pressure pump.
Step S107, the pyrolysis condensation wastewater in the step S106 is conveyed back to the interior of the cyclic adsorption oxidation tower 1, and then flows out from the first water outlet 13, is added with a predetermined amount of oxidant and is conveyed back to the interior of the cyclic adsorption oxidation tower 1 in sequence; the steps of sequentially flowing out the pyrolysis condensation wastewater through the first water outlet 13, adding a predetermined amount of oxidant and re-conveying the pyrolysis condensation wastewater back to the cyclic adsorption oxidation tower 1 are equivalent to a primary circulation step.
Step S108, after the circulation step in the step S107 is circulated for a preset number of times, the pyrolysis condensation wastewater in the circulating adsorption oxidation tower 1 flows out through the second water outlet 14; it should be noted that the specific circulation ratio of the pyrolysis condensation wastewater can be suitably selected according to actual conditions.
Step S109, carrying out pH adjustment on the pyrolysis condensation wastewater flowing out from the second water outlet 14 in the step S104 or the step S108 through a pH adjustment section; among them, the pH range is preferably 2 to 5.
And S110, carrying out stripping treatment on the pyrolysis condensation wastewater subjected to pH adjustment through an ammonia stripping tower, wherein the stripping process is controlled according to a conventional ammonia stripping process.
Further, in the above steps S103 to S110, the principle of treating the pyrolysis condensation wastewater is as follows:
the pyrolytic carbon is generated in a high reduction state, and has certain adsorption function and catalytic function after proper pretreatment; therefore, the process of removing the biotoxic organic matters in the pyrolysis condensed water in the circulating adsorption oxidation tower can be regarded as follows:
firstly, pyrolyzing soluble organic matters in condensed water, gradually enriching the surface of pyrolytic carbon powder under the adsorption action of pyrolytic carbon, and forming a high-concentration area; meanwhile, in the state of low pH value, under the catalytic action of pyrolytic carbon, an oxidant (hydrogen peroxide) added into the wastewater breaks the chains of macromolecular organic matters and is oxidized, and the main reaction refers to the following two relational expressions:
RH+·OH→H2o +. R → further oxidation (2);
under the acidic condition, under the catalytic action of pyrolytic carbon, hydrogen peroxide generates hydroxyl free radicals (. OH), and the free radicals contain very strong oxidizability, and oxidize, pyrolyze and condense organic matters in the wastewater; the pyrolytic carbon is a reducing substance, and the surface of the pyrolytic carbon can be oxidized to generate an oxidizing group with oxidizing property.
When the adsorbed organic matters are oxidized by hydroxyl radicals, the oxygen radicals can also participate in the subsequent oxidation reaction, thereby achieving the purposes of reducing the biological toxicity of the pyrolysis condensed wastewater and improving the B/C ratio. The operation result proves that the B/C of the pyrolysis condensed wastewater can be improved from 0.1 to 0.3 by the system, and biochemical conditions are basically met.
The pretreatment method for the domestic garbage pyrolytic condensation wastewater can fully utilize the characteristics of slightly acidic pyrolytic condensation water and high temperature, adopts the pyrolytic carbon in the cyclic adsorption oxidation tower 1 to treat the pyrolytic condensation wastewater, so as to prepare waste from waste, can return the saturated pyrolytic carbon to the furnace for cyclic pyrolysis, does not produce secondary pollution, does not increase the total soluble solid content of the wastewater, and does not produce sludge; and the cost is lower, the control is simple, the effect of improving the biodegradability is good, and high automatic control can be realized according to the requirement so as to reduce the labor intensity.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The utility model provides a domestic waste pyrolysis condensation pretreatment of water system, its characterized in that includes:
the circulating adsorption oxidation tower (1) comprises a tower body (11), a water inlet (12), a first water outlet (13) and a second water outlet (14), wherein the water inlet (12) is formed in the side face of the tower body (11), the first water outlet (13) is formed in the bottom of the tower body (11), the second water outlet (14) is formed in the position, higher than the water inlet (12), of the side face of the tower body (11), at least one water distribution filler layer (15) and at least one pyrolytic carbon filler layer (16) are arranged inside the tower body (11) between the water inlet (12) and the second water outlet (14), and the pyrolytic carbon filler is filled inside the water distribution filler layer (15);
the oil removal and precipitation system is used for carrying out oil removal and precipitation treatment on the pyrolysis and condensation wastewater;
the conveying device is used for conveying the pyrolysis condensed wastewater subjected to the oil separation and precipitation treatment to a water inlet (12) of the circulating adsorption oxidation tower (1), and is also used for re-conveying a predetermined volume of pyrolysis condensed wastewater flowing out of a first water outlet (13) of the circulating adsorption oxidation tower (1) to the water inlet (12);
the oxidizing agent adding system is used for adding a preset amount of oxidizing agent into the pyrolysis condensation wastewater flowing out of the first water outlet (13);
the pH adjusting section is used for adjusting the pH of the pyrolysis condensation wastewater flowing out of the second water outlet (14) of the circulating adsorption oxidation tower (1);
and the ammonia stripping tower is used for carrying out stripping treatment on the pyrolysis condensation wastewater subjected to the pH adjustment.
2. The pretreatment system for household garbage pyrolytic condensation wastewater according to claim 1, wherein each layer of the water distribution packing layer (15) and each layer of the pyrolytic carbon packing layer (16) are distributed at intervals from bottom to top.
3. The pretreatment system for household garbage pyrolytic condensation wastewater according to claim 1, wherein the delivery device is a high pressure pump.
4. The pretreatment system for household garbage pyrolytic condensation wastewater according to claim 1, wherein the oxidant is hydrogen peroxide.
5. The pretreatment system for household garbage pyrolytic condensation wastewater according to claim 4, wherein the oxidant addition system comprises a metering pump.
6. The method for treating the domestic garbage pyrolytic condensation wastewater pretreatment system according to any one of claims 1-5, characterized by comprising the steps of:
carrying out oil removal and precipitation treatment on pyrolysis condensation wastewater through an oil removal and precipitation system;
step two, adjusting the temperature and the pressure in the circulating adsorption oxidation tower (1) to a preset temperature and a preset pressure respectively;
step three, conveying the pyrolysis condensed wastewater subjected to the oil separation precipitation treatment to the interior of the circulating adsorption oxidation tower (1) from a water inlet (12) through a conveying device;
step four, in the pyrolysis condensation wastewater entering the interior of the circulating adsorption oxidation tower (1), enabling a preset percentage of the pyrolysis condensation wastewater to flow out of a second water outlet (14) of the circulating adsorption oxidation tower (1), and enabling the rest percentage of the pyrolysis condensation wastewater to flow out of a first water outlet (13) of the circulating adsorption oxidation tower;
fifthly, adding a predetermined amount of oxidant into the pyrolysis condensation wastewater flowing out of the first water outlet (13) through an oxidant adding system;
sixthly, the pyrolysis condensation wastewater added with the oxidant is conveyed to the interior of the circulating adsorption oxidation tower (1) again through the conveying device;
step seven, the pyrolysis condensation wastewater in the step six is conveyed back to the interior of the cyclic adsorption oxidation tower (1), then flows out from the first water outlet (13), is added with a predetermined amount of oxidant, and is conveyed back to the interior of the cyclic adsorption oxidation tower (1);
step eight, after the circulation step in the step seven is circulated for a preset number of times, the pyrolysis condensed wastewater in the circulation adsorption oxidation tower (1) flows out through a second water outlet (14);
step nine, carrying out pH adjustment on the pyrolysis condensation wastewater flowing out from the second water outlet (14) in the step four or the step eight through a pH adjustment section;
and step ten, carrying out air stripping treatment on the pyrolysis condensation wastewater subjected to pH adjustment through an ammonia air stripping tower.
7. The treatment method of the pretreatment system for household garbage pyrolytic condensation wastewater according to claim 6, wherein in the second step, the predetermined temperature of the circulating adsorption oxidation tower (1) is not less than 45 ℃ and the predetermined pressure is not less than 0.5 MPa.
8. The treatment method of the pretreatment system for domestic waste pyrolysis condensation wastewater according to claim 6, wherein in the fourth step, the effluent from the second water outlet (14) of the cyclic adsorption oxidation tower (1) accounts for 5% -20% of the total cyclic water.
9. The treatment method of the pretreatment system for domestic waste pyrolysis and condensation wastewater according to claim 6, wherein the oxidant in the fifth step is hydrogen peroxide, and the mass ratio of the hydrogen peroxide to the Chemical Oxygen Demand (COD) is 0.1-0.5.
10. The method for treating the pretreatment system for household garbage pyrolytic condensation wastewater according to claim 6, wherein in the ninth step, the pH value is in the range of 2-5.
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| CN104650933A (en) * | 2015-01-13 | 2015-05-27 | 北京神雾环境能源科技集团股份有限公司 | Garbage pyrolysis sewage treatment system and garbage pyrolysis sewage treatment method |
| CN105149323A (en) * | 2015-09-30 | 2015-12-16 | 烟台润达垃圾处理环保股份有限公司 | Process and device for quickly comprehensively treating household garbage |
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| CN104650933A (en) * | 2015-01-13 | 2015-05-27 | 北京神雾环境能源科技集团股份有限公司 | Garbage pyrolysis sewage treatment system and garbage pyrolysis sewage treatment method |
| CN105149323A (en) * | 2015-09-30 | 2015-12-16 | 烟台润达垃圾处理环保股份有限公司 | Process and device for quickly comprehensively treating household garbage |
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