CN211471164U

CN211471164U - Treatment device for wastewater of activated carbon desulfurization and denitrification system

Info

Publication number: CN211471164U
Application number: CN201922372117.3U
Authority: CN
Inventors: 王建华; 张宇鑫; 邱明英; 朱繁; 崔岩; 张亚志; 郝景章
Original assignee: MCC Capital Engineering and Research Incorporation Ltd
Current assignee: MCC Capital Engineering and Research Incorporation Ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-09-11
Anticipated expiration: 2029-12-24

Abstract

The utility model provides a treatment device for wastewater of an activated carbon desulfurization and denitrification system. The device includes: pretreatment unit and solid-liquidThe device comprises a separation device, an anaerobic reactor and a desulfurization and denitrification reactor; the pretreatment unit is provided with at least one dosing port and at least one backflow water inlet; the water outlet of the pretreatment unit is connected with the water inlet of the solid-liquid separation equipment, the water outlet of the solid-liquid separation equipment is connected with the water inlet of the anaerobic reactor, and the water outlet of the anaerobic reactor is respectively connected with the water inlet of the desulfurization and denitrification reactor and the return water inlet of the pretreatment unit; the pretreatment unit is used for realizing F removal^‑The wastewater and the return water are mixed to react and neutralize the acidic wastewater and remove heavy metals, and coagulation and flocculation reactions are realized; wherein the return water is wastewater treated by an anaerobic reactor; the desulfurization and denitrification reactor is a facultative anaerobic reactor. The treatment device is suitable for carrying out an economic and environment-friendly wastewater treatment method of the activated carbon desulfurization and denitrification system.

Description

Treatment device for wastewater of activated carbon desulfurization and denitrification system

Technical Field

The utility model belongs to the technical field of waste water treatment, a processing apparatus of active carbon SOx/NOx control system waste water is related to.

Background

For reducing SO in flue gas₂、NO_xWhen pollutants are discharged, the flue gas needs to be subjected to desulfurization, denitrification and purification treatment, and along with the combined removal of multiple pollutants and the enhancement of ultra-low emission requirements, the activated carbon flue gas purification technology becomes one of mainstream desulfurization and denitrification processes, and the technology takes activated carbon as an adsorbent to remove SO₂Fluorine, chlorine, heavy metals and other pollutants, and utilizes the catalytic performance of the active carbon to react NO by taking ammonia as a reducing agent_xAnd (4) carrying out reduction removal.

An adsorption tower of the activated carbon desulfurization and denitrification process is used for desulfurization and denitrification of flue gas, and a desorption tower is used for desorption and regeneration of activated carbon with saturated adsorption; desorption to produce SO-enriched gas₂Into the desorption gas ofAnd a byproduct system for preparing salt or acid and recovering sulfur resources. Acid-containing wastewater generated in the processes of salt preparation and acid preparation is difficult to treat; it features complex components, low pH value (1.0-2.0), high concentration of suspended matter (carbon powder 65-85%), and SO₃ ^2-、SO₄ ^2-、NH₄ ⁺High concentration, and contains heavy metal ions and F^-、Cl^-And oily wastewater. The conventional treatment method and the single treatment method cannot meet the treatment standard. The investment and the operation cost of the prior treatment method and the prior process are high at the initial stage; the treatment process is also not perfect.

CN203922919U waste water treatment system for activated carbon desulfurization and denitrification acid making process discloses a waste water treatment process of 'magnetic coagulation sedimentation + filtration + membrane absorption'. The acid-making wastewater sequentially passes through a first alkali adjusting tank, a magnetic coagulation tank, a clarifier, a second alkali adjusting tank, a filter and a membrane absorption device; adding lime milk and sodium hydroxide into an alkali adjusting tank, adding a flocculating agent into a magnetic coagulation tank, and then removing precipitates through precipitation, multi-medium filtration and carbon filtration; the treatment process adopts a membrane absorption device to recover ammonia in the wastewater into a solution containing 40 percent of ammonium sulfate. When the system is used for treating wastewater of an activated carbon desulfurization and denitrification system, the membrane pores of the membrane absorption device are easy to deposit, pollute and block, strict requirements are imposed on the quality of inlet water, the process realization difficulty is high, and the operation cost is high; the early investment cost of the membrane treatment and pretreatment device is high, and the popularization difficulty is high; the by-product after treatment is still solution and needs subsequent treatment.

The application of triple effect evaporation in the treatment of wastewater from acid production by desulfurization and denitrification through desulfurization and denitrification is mentioned in the article of application of triple effect evaporation crystallization process in the treatment of wastewater from acid production by desulfurization and denitrification (new product of Chinese technology, 6 (next) at the end of 2017). Raw material → preheater → III effect heater and III effect evaporation chamber → II effect heater and II effect evaporation chamber (countercurrent) → I effect heater and I effect evaporation chamber (forced circulation) → saturated concentration → crystallization kettle → centrifuge → solid-liquid separation. Before triple-effect evaporation and crystallization, the process only carries out comprehensive treatment on the wastewater, solid particles, heavy metal impurities and the like are not removed, and the crystallized salt is mixed salt and cannot be utilized. The triple effect evaporation produces concentrated mother liquor which cannot be processed. The triple effect evaporator is easy to block. The process equipment is made of stainless steel corrosion-resistant materials, consumes steam, and has high investment and operation cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a processing apparatus of active carbon SOx/NOx control system waste water uses the device to carry out the high concentration that produces in the active carbon SOx/NOx control system waste water treatment can the effective treatment active carbon SOx/NOx control technology and contains the acid waste water, realizes active carbon granule, SO₃ ^2-、SO₄ ^2-、NH⁴⁺、F^-And the heavy metal ions and the like can be removed without adding extra chemicals, and the device has lower equipment investment and operation cost.

In order to realize the above object, the utility model provides a processing apparatus of active carbon SOx/NOx control system waste water, wherein, the device includes:

the device comprises a pretreatment unit, solid-liquid separation equipment, an anaerobic reactor and a desulfurization and denitrification reactor, wherein the pretreatment unit is provided with at least one dosing port and at least one backflow water inlet; wherein the content of the first and second substances,

the water outlet of the pretreatment unit is connected with the water inlet of the solid-liquid separation equipment, the water outlet of the solid-liquid separation equipment is connected with the water inlet of the anaerobic reactor, and the water outlet of the anaerobic reactor is respectively connected with the water inlet of the desulfurization and denitrification reactor and the return water inlet of the pretreatment unit;

the pretreatment unit is used for realizing F removal^-The device is used for mixing the wastewater entering the pretreatment unit with the backflow water to perform reaction for removing heavy metals and neutralizing the acidic wastewater, and is used for realizing coagulation and flocculation reaction of the wastewater; wherein the return water is wastewater treated by the anaerobic reactor;

the desulfurization and denitrification reactor is a facultative anaerobic reactor.

In the above apparatus for treating wastewater from an activated carbon desulfurization and denitrification system, preferably, the pretreatment unit comprises a first-stage device, a second-stage device, a third-stage device and a fourth-stage device, wherein the first-stage device is provided with a chemical feeding port and a second-stage deviceThe equipment is provided with a backflow water inlet; the water outlet of the first-stage equipment is connected with the water inlet of the second-stage equipment, the water outlet of the second-stage equipment is connected with the water inlet of the third-stage equipment, the water outlet of the third-stage equipment is connected with the water inlet of the fourth-stage equipment, and the water outlet of the fourth-stage equipment is used as the water outlet of the pretreatment unit and is connected with the water inlet of the solid-liquid separation equipment, so that the water outlet of the pretreatment unit is connected with the water inlet of the solid-liquid separation equipment; a return water inlet of the second-stage equipment is connected with a water outlet of the anaerobic reactor, so that the connection between the water outlet of the anaerobic reactor and a return water inlet of the pretreatment unit is realized; the I-section equipment is used for mixing the wastewater entering from the water inlet of the I-section equipment and the medicine added from the medicine adding port of the I-section equipment to react and remove F in the wastewater^-(ii) a The second-stage equipment is used for mixing wastewater entering from a water inlet of the second-stage equipment with return water entering from a return water inlet of the second-stage equipment to react to remove heavy metal ions in the wastewater and neutralize acidic wastewater, wherein the return water is the wastewater treated by the anaerobic reactor; the III-section equipment is coagulation reaction equipment and is used for realizing coagulation reaction of wastewater entering from a water inlet of the III-section equipment; and the IV-section equipment is flocculation reaction equipment and is used for realizing flocculation reaction of wastewater entering from a water inlet of the IV-section equipment.

In a preferred embodiment, the first section of equipment, the second section of equipment, the third section of equipment and the fourth section of equipment are arranged in a header, at least three partition plates are arranged in the header to divide the header into at least four sections, the four sections sequentially connected in the header are named as the first section of the header and the second section of the header, and the third section of the header and the fourth section of the header are respectively used as the first section of equipment, the second section of equipment, the third section of equipment and the fourth section of equipment.

In a preferred embodiment, the section III equipment is provided with a dosing port, and the section III equipment is used for mixing wastewater entering from a water inlet of the section III equipment with a medicine added from the dosing port of the section III equipment to perform a coagulation reaction. The feeding port of the III-section equipment is preferably connected with PAC (polyaluminium chloride) supply equipment, so that PAC medicines are fed into the III-section equipment; the addition of PAC to the wastewater can cause coagulation of the wastewater. Wherein, the III-section equipment is preferably provided with a stirrer; the stirrer is favorable for realizing the full mixing and reaction of the medicine and the wastewater.

In a preferred embodiment, the IV-section equipment is provided with a dosing port, and the IV-section equipment is used for mixing wastewater entering from a water inlet of the IV-section equipment and a medicine added from the dosing port of the IV-section equipment to perform a flocculation reaction. The drug adding port of the IV-section equipment is preferably connected with PAM (polyacrylamide) supply equipment, so that PAM (polyacrylamide) drugs can be added into the IV-section equipment; PAM is added into the wastewater to flocculate the coagulated wastewater. Wherein, the IV-section equipment is preferably provided with a stirrer; the stirrer is favorable for realizing the full mixing and reaction of the medicine and the wastewater, and the stirrer maintains low rotating speed in the operation process of the IV-section equipment, so that the flocs are more favorably promoted to grow up.

In a preferred embodiment, the I-section equipment dosing port and CaCO₃Supply equipment connection to enable CaCO addition to I-segment equipment₃. Adding CaCO to waste water₃Can partially neutralize acid wastewater to generate Ca²⁺Removing F in the wastewater^-And the SO in the wastewater is reserved₃ ^2-、SO₄ ^2-。

In a preferred embodiment, the stage I apparatus is provided with the blender.

In a preferred embodiment, said stage ii apparatus is provided with said blender.

In the above-mentioned apparatus for treating wastewater from an activated carbon desulfurization and denitrification system, preferably, at least one chemical feed port of the pretreatment unit is connected to CaCO₃Supply equipment connections enabling CaCO addition to the front-end processing units₃A pharmaceutical; more preferably, when the pretreatment unit comprises the above-mentioned I section equipment, II section equipment, III section equipment and IV section equipment, the pretreatment unit is connected with CaCO₃The dosing port connected with the supply equipment is the dosing port of the I-section equipment, so that CaCO is added into the I-section equipment₃A pharmaceutical composition. Adding CaCO to waste water₃Can partially neutralize acid wastewater and remove F in the wastewater^-And the SO in the wastewater is reserved₃ ^2-、SO₄ ^2-。

In the above apparatus for treating wastewater from an activated carbon desulfurization and denitrification system, preferably, at least one chemical feeding port of the pretreatment unit is connected to a PAC (polyaluminium chloride) supply device to feed PAC chemicals to the pretreatment unit; more preferably, when the pretreatment unit comprises the above first stage equipment, second stage equipment, third stage equipment and fourth stage equipment, the medicine adding port connected with the PAC supply equipment is a medicine adding port of the third stage equipment, so as to add PAC medicine to the third stage equipment.

In the above apparatus for treating wastewater from an activated carbon desulfurization and denitrification system, preferably, at least one dosing port of the pretreatment unit is connected to a PAM (polyacrylamide) supply device to enable a PAM chemical to be added to the pretreatment unit; more preferably, when the pretreatment unit comprises the above first-stage equipment, second-stage equipment, third-stage equipment and fourth-stage equipment, the medicine adding port connected with the PAM supply equipment is the medicine adding port of the fourth-stage equipment, so that PAM medicine is added to the fourth-stage equipment.

In one embodiment, the pretreatment unit is a reaction vessel having a dosing port and a return water port, and the dosing port of the pretreatment unit is connected to the CaCO₃The supply equipment is connected with the polyaluminium supply equipment and the polyacrylamide supply equipment; when the pretreatment unit is used for wastewater treatment, CaCO can be added into the pretreatment unit₃To realize F removal^-Then introducing return water into the front treatment unit to neutralize the wastewater and remove heavy metal ions, then adding polyaluminium into the front treatment unit to realize coagulation, and finally adding polyacrylamide into the front treatment unit to realize flocculation.

In the above apparatus for treating wastewater from an activated carbon desulfurization and denitrification system, preferably, the pretreatment unit is provided with a stirrer; more preferably, when the pretreatment unit comprises the above first-stage equipment, second-stage equipment, third-stage equipment and fourth-stage equipment, the first-stage equipment is provided with the stirrer, the second-stage equipment is provided with the stirrer, the third-stage equipment is provided with the stirrer, and the fourth-stage equipment is provided with the stirrer.

In the above apparatus for treating wastewater from an activated carbon desulfurization and denitrification system, preferably, the solid-liquid separation device comprises an air flotation tank and a sand filter tank, a water outlet of the air flotation tank is connected to a water inlet of the sand filter tank, a water inlet of the air flotation tank is connected to a water outlet of the pretreatment unit as a water inlet of the solid-liquid separation device, so that a water outlet of the pretreatment unit is connected to a water inlet of the solid-liquid separation device, and a water outlet of the sand filter tank is connected to a water inlet of the anaerobic reactor as a water outlet of the solid-liquid separation device, so that a water outlet of the solid-liquid; wherein, the air supporting pond is connected with dissolved gas jar and is realized carrying out air supporting slagging-off, deoiling to the waste water in the air supporting pond.

In a preferred embodiment, the air flotation tank can realize dissolved air flotation or air distribution air flotation; the air floatation tank is preferably capable of realizing dissolved air floatation.

In a preferred embodiment, the sand filter is a multi-media filter, a filter material layer and a gravel supporting layer arranged at the lower part of the filter material layer are arranged in the sand filter, and filter materials of the filter material layer comprise at least two of quartz sand, white coal, ceramsite, blast furnace slag, garnet and the like. The filter material in the filter material layer generally needs to satisfy: has sufficient mechanical strength, good chemical stability, proper grading and sufficient void ratio. Gravel bearers generally need to meet: the water distributor is not easy to be impacted during backwashing, has good chemical stability, high mechanical strength and uniform water distribution.

In the above apparatus for treating wastewater from an activated carbon desulfurization and denitrification system, preferably, the anaerobic reactor comprises at least one of an upflow anaerobic filter, an anaerobic trickling filter and an upflow anaerobic sludge bed reactor. Wherein, the filler in the upflow anaerobic filter preferably comprises at least one of porous ceramsite, AC (activated carbon/activated coke), ladder ring, fibrous porous plastic and polypropylene plastic, but is not limited thereto; the bio-trickling filter reactor preferably comprises at least one of porous ceramsite, AC (activated carbon/activated coke), stepped ring, fibrous porous plastic and polypropylene plastic, but is not limited thereto; the filler has high physical and chemical stability and can keep higher biomass. The upflow anaerobic filter tank and anaerobic trickling filter tower belong to an anaerobic fixed bed reactor, the anaerobic trickling filter tower belongs to an anaerobic internal circulation reactor and an anaerobic sequencing batch reactor, and the upflow anaerobic sludge bed reactor has no carrier and belongs to a suspended growth type digester.

In the above-mentioned apparatus for treating wastewater from an activated carbon desulfurization and denitrification system, preferably, SRB (sulfate reducing bacteria) is grown in the anaerobic reactor. In a specific embodiment, the dominant microflora SRB is cultured in the anaerobic reactor. SRB is an anaerobic bacterium, but has certain tolerance to oxygen and can convert SO₃ ^2-And SO₄ ^2-Reduction to S^2-。

In the above-mentioned apparatus for treating wastewater in an activated carbon desulfurization and denitrification system, it is preferable that T.D (Thiobacillus denitrificans) is grown in the desulfurization and denitrification reactor. In one embodiment, the dominant population T.D is cultured in the desulfurisation denitrogenation reactor. T.D has the physiological characteristics of facultative anaerobism and denitrification, namely, nitrate is reduced into nitrogen under the anaerobic condition, and the nitrogen is autotrophic microorganisms; under anaerobic condition with S^2-The sulfur is oxidized into elemental sulfur for an electron donor, and simultaneously has the capability of desulfurization and denitrification.

In the above apparatus for treating wastewater from an activated carbon desulfurization and denitrification system, preferably, the pretreatment unit is provided with a sludge collecting hopper for collecting a precipitate generated when wastewater is treated in the pretreatment unit; more preferably, the mud collection hopper is connected with a filter press.

In the above apparatus for treating wastewater from an activated carbon desulfurization and denitrification system, preferably, the denitrification reactor is provided with a sludge hopper for collecting precipitates generated when wastewater is treated in the denitrification reactor; more preferably, the mud collecting hopper is connected with a filter press.

In the above device for treating wastewater of an activated carbon desulfurization and denitrification system, preferably, the device is further provided with a regulating reservoir, a water outlet of the regulating reservoir is connected with a water inlet of the pretreatment unit, and the regulating reservoir is used for realizing water quantity and water quality regulation and pre-precipitation of particles. More preferably, the adjusting tank is provided with a mud collecting hopper for collecting sediment generated when the wastewater is treated in the adjusting tank. Further preferably, the mud collecting hopper is connected with a filter press.

In the above apparatus for treating wastewater from an activated carbon desulfurization and denitrification system, the desulfurization and denitrification reactor is preferably provided with an air inlet. And blowing a proper amount of air into the desulfurization and denitrification reactor through the air inlet to maintain the desulfurization and denitrification reactor in a proper ORP interval.

The method for treating the wastewater of the activated carbon desulfurization and denitrification system by using the device for treating the wastewater of the activated carbon desulfurization and denitrification system comprises the following steps:

step 1): adding appropriate amount of CaCO into wastewater to be treated₃Reacts with acidic wastewater to release Ca²⁺，Ca²⁺With F in the waste water^-The reaction produces a precipitate to remove F from the wastewater^-And the SO in the wastewater is reserved₃ ^2-、SO₄ ^2-；

Step 2): adding part of the wastewater obtained after the treatment in the step 5) into the wastewater treated in the step 1) to remove heavy metal ions in the wastewater and neutralize acid-containing wastewater;

step 3): coagulating and flocculating the wastewater treated in the step 2);

step 4): carrying out solid-liquid separation on the coagulated and flocculated wastewater to remove solid matters, oils and precipitates generated by reaction in the wastewater;

step 5): performing first biological treatment on the wastewater treated in the step 4) by using SRB (sulfate reducing bacteria) in an anaerobic environment and in the presence of an external carbon source to remove SO in the wastewater₃ ^2-And/or SO₄ ^2-Reduction to S^2-Reacting NH₄ ⁺Conversion to NO₃ ^-(ii) a Dividing the wastewater obtained after the first biological treatment into two parts, continuously performing subsequent treatment on the first part, and performing reflux on the second part to mix with the wastewater treated in the step 1) to realize the specific operation of the step 2);

step 6): subjecting a first part of the wastewater obtained after the first biological treatment to a second biological treatment using T.D (Thiobacillus denitrificans) in a facultative anaerobic environment to separate S from the wastewater^2-Oxidation to elemental sulphur S⁰And NO in the wastewater₃ ^-、NO₂ ^-Reduction to N₂(ii) a Thus, the wastewater treatment is completed.

In the above treatment method, preferably, the wastewater to be treated is pretreated before being subjected to the step 1), and the pretreatment comprises: water quantity and water quality regulation and pre-precipitation of particles. The water quantity and water quality of the wastewater to be treated are adjusted before the step 1) is carried out, so that the influence of water fluctuation on subsequent treatment can be reduced. The particulate matter pre-precipitation mainly comprises the step of carrying out preliminary precipitation on large particulate matters which are easy to precipitate in wastewater to be treated.

In the above treatment method, CaCO is added to wastewater to be treated₃Can partially neutralize acid wastewater to generate Ca²⁺Control of CaCO₃To achieve CaF₂Removing F by precipitation^-Without CaSO₃、CaSO₄Precipitating to retain SO in the wastewater₃ ^2-、SO₄ ^2-。CaF₂Ratio of solubility product constants CaSO₄4 orders of magnitude (i.e., one ten thousandth) less, thereby controlling CaCO₃To achieve CaF₂Is fully precipitated without CaSO₄Precipitating; while Ca²⁺Can be reacted with As³⁺Complexing to form Ca (AsO)₃)₂Thereby removing As³⁺。

In the above treatment method, the wastewater obtained after the treatment in step 5) contains a large amount of S^2-And CO₃ ^2-、OH^-The alkalinity substances are subjected to reflux on part of the wastewater obtained after the treatment in the step 5) and the wastewater treated in the step 1) are mixed, so that heavy metal ions in the wastewater can be fully precipitated and acidic wastewater can be neutralized, and the heavy metal ions in the wastewater can be removed without adding additional agents; the conventional treatment process is to add chemical agents of organic sulfur and lime milk to generate sulfide and hydroxide precipitates. The wastewater contains various heavy metal ions, such As Cd ion, Cr ion, Co ion, Cu ion, Hg ion, Mn ion, Ni ion, Pb ion, As ion, Se ion, Sn ion, Zn ion, etc., wherein Fe³⁺、Zn²⁺、Cu²⁺、Ni²⁺、Cr³⁺The heavy metal ions form hydroxide or carbonate precipitates. Pb²⁺、Hg²⁺And S^2-The reaction produces sulfide deposits. At the same time H₂S canReducing Cr (VI) with high toxicity into Cr (III) with low toxicity; the selenite can be reacted with H₂S reacts to generate elemental selenium.

In the above treatment method, preferably, the coagulation is carried out by adding PAC (polyaluminium chloride). PAC can be suitable for a wide pH range (PAC can well coagulate wastewater with pH value of 5-9).

In the above treatment method, preferably, the flocculation is carried out by adding PAM (polyacrylamide).

In the above treatment method, preferably, coagulation is performed before flocculation, wherein the flocculation is performed under low-speed stirring (such as 60-120r/min), which is beneficial to both the sufficient flocculation reaction and the growth of flocs.

In the above treatment method, preferably, the solid-liquid separation comprises air flotation deslagging and oil removal steps, and the wastewater after air flotation deslagging and oil removal is subjected to multi-medium filtration to further remove suspended matter particles. The air flotation is preferably carried out by adopting a dissolved air flotation or an air distribution flotation, and more preferably carried out by adopting a dissolved air flotation. Wherein, the medium for multi-medium filtration preferably comprises at least two of quartz sand, white coal, ceramsite, blast furnace slag and garnet. The solid-liquid separation mode of air flotation deslagging, oil removal and multi-medium filtration is adopted, so that solid matters, oils and precipitates generated by reaction in the wastewater can be effectively removed, and good conditions are created for subsequent biological treatment. Scum generated by air floatation can be collected by a scum scraper and separated from waste water, and the collected scum can be dewatered by sludge dewatering equipment (such as a plate and frame filter press, a stacked spiral sludge dewatering machine and a centrifugal sludge dewatering machine) and also can be dried. The air floatation method can better remove AC (activated carbon/activated coke) and grease in the wastewater, and compared with the traditional process precipitation method, the air floatation method has higher treatment efficiency, good effluent quality and lower water content of scum; the water content of the scum obtained by the treatment is generally below 96 percent by adopting the air floatation method, only the volume of the scum is 1/2-1/10 of that of the sludge in a sedimentation tank, and the amount of the chemical required by the air floatation method is less than that of the scum obtained by the sedimentation method. Because the wastewater of the activated carbon desulfurization and denitrification system contains oil, the air flotation has great advantages, suspended carbon particles in the wastewater can be removed by air flotation, and the F & lt- & gt and the precipitate generated by heavy metal ion removal of the wastewater are also removed.

In the treatment method, the air flotation deslagging and oil removal are realized by introducing bubbles with certain size into the wastewater, so that pollutants in the wastewater are adsorbed on the bubbles and float to the water surface along with the bubbles to realize deslagging and oil removal.

In the above treatment method, preferably, the carbon source of step 5) includes at least one of anaerobic hydrolytic acidification sewage, methanol solution, formic acid solution, ethanol solution, acetic acid solution, lactic acid solution, and the like; wherein, the methanol solution can select for use the methanol waste liquid, and the formic acid waste liquid can be selected for use to the formic acid solution, and the ethanol waste liquid can be selected for use to the ethanol solution, and the acetic acid waste liquid can be selected for use to the acetic acid solution, and the lactic acid waste liquid can be selected for use to the lactic acid solution, and the preferred biodegradability of anaerobic hydrolysis acidizing sewage is good for the person to use.

In the above treatment method, in step 5), SRB treats SO in an anaerobic environment in the presence of an external carbon source₃ ^2-/SO₄ ^2-Reduction to S^2-And generates alkalinity (step 5), and the treated wastewater contains a large amount of S^2-And CO₃ ^2-、OH^-An isoalkalinity substance); SRB with NH₄ ⁺As a nitrogen source, NH is consumed during the reduction₄ ⁺And converting it to NO₃ ^-。

In the above treatment method, T.D is S in a facultative anaerobic environment during the treatment in step 6)^2-Oxidizing to elemental sulfur S for an electron donor⁰And with NO₃ ^-As an electron acceptor, reducing it to N₂。S⁰Deposited on the bottom of the reactor and can be recycled (for example, dehydration recycling can be carried out through a filter press II). SO in the wastewater₃ ^2-、SO₄ ^2-、NH₄ ⁺All are effectively removed, and the treated supernatant can be directly discharged. The denitrobacterium (T.D) has physiological characteristics of facultative anaerobism and denitrification, namely, nitrate (in NO) can be reduced under anaerobic condition₃ ^-、NO₂ ^-As an electron acceptor) is nitrogen. Is an autotrophic microorganism without adding organic matters.

In the above treatment method, the precipitates collected in the pretreatment, step 1), step 2) and step 3) may be dehydrated and collected by using a filter press machine.

In the above treatment method, an appropriate amount of air may be introduced to maintain an appropriate ORP (oxidation reduction potential) range value in the step 6).

The steps 1) to 6) in the above treatment method are steps of performing wastewater treatment after stable circulation operation.

Before a stable cycle is not formed (namely before the wastewater treated in the step 5) is not obtained), in the step 2), adding a medicament into the wastewater treated in the step 1) for removing heavy metal ions in the wastewater and neutralizing the acid-containing wastewater; the remaining steps are the same as those after the formation of the stabilization cycle.

The utility model provides a processing apparatus of active carbon SOx/NOx control system waste water is suitable for going on of the active carbon SOx/NOx control system waste water treatment method of an economy, environmental protection. Compared with the prior art, the utility model has the advantages of as follows:

1. use the utility model provides a processing apparatus of active carbon SOx/NOx control system waste water carries out the high concentration that produces in the active carbon SOx/NOx control system waste water treatment can be comparatively thorough processing active carbon SOx/NOx control technology contains the acid waste water, effectively gets rid of AC (active carbon/active coke) granule, gets rid of H⁺、F^-And heavy metal ions, removing SO₃ ^2-、SO₄ ^2-、NH⁴⁺And elemental sulfur can be produced as a by-product.

2. Use the utility model provides a processing apparatus of active carbon SOx/NOx control system waste water has and helps realizing carrying out getting rid of heavy metal ion through the backward flow water in the active carbon SOx/NOx control system waste water treatment process, and the basicity neutralization acid waste water in the backward flow water simultaneously, more tradition is through getting rid of heavy metal ion economy, the environmental protection of adding medicament organic sulfur and alkali lye.

3. Use the utility model provides a processing apparatus of active carbon SOx/NOx control system waste water handles and helps realizing adopting the physical chemistry method to combine technology with the microorganism method to carry out active carbon SOx/NOx control system waste water.

4. Use the utility model provides a processing apparatus of active carbon SOx/NOx control system waste water carries out the waste water treatment of active carbon SOx/NOx control system, helps avoiding producing extra abandonment treatment fluid (such as the abandonment mother liquor of triple effect evaporation, the concentrate of membrane treatment etc.), and is more environmental protection.

5. The utility model provides a processing apparatus of active carbon SOx/NOx control system waste water can realize using cheap materials such as concrete, carbon steel anticorrosive material or glass steel to build the main part of used device, and equipment investment cost is low.

6. Use the utility model provides a processing apparatus of active carbon SOx/NOx control system waste water carries out active carbon SOx/NOx control system waste water treatment running cost lower.

7. Use the utility model provides a processing apparatus of active carbon SOx/NOx control system waste water carries out active carbon SOx/NOx control system waste water treatment and helps realizing NH⁴⁺Conversion to N₂The emission is not carried out by ammonia gas or ammonium salt, nitrate and the like, so that the environment is more protected.

Drawings

FIG. 1 is a schematic view of an apparatus for treating wastewater from an activated carbon desulfurization and denitrification system provided in example 1.

Detailed Description

In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description is given to the technical solution of the present invention, but the technical solution of the present invention is not limited to the limit of the implementable range of the present invention.

Example 1

This example provides an apparatus for treating wastewater from an activated carbon desulfurization and denitrification system (as shown in FIG. 1), which has a design treatment capacity of 5m³H, the device comprises:

the device comprises a regulating tank 1, a pretreatment unit, an air flotation tank 9, a sand filter 10, an anaerobic reactor 11 and a desulfurization and denitrification reactor 12; wherein the content of the first and second substances,

the effective tank capacity of the adjusting tank 1 is 20m³The adjusting tank 1 is a buried concrete structure, and the tank wall is anticorrosive;

the pretreatment unit comprises I-section equipment, II-section equipment, III-section equipment and IV-section equipment, the I-section equipment, the II-section equipment, the III-section equipment and the IV-section equipment are arranged in a header, three partition plates are arranged in the header to divide the header into four sections which are sequentially connected, the sections are communicated only through water gaps, the four sections in the header are sequentially named as I-section 3 and II-section 4 of the header, and III-section 5 and IV-section 6 of the header are respectively used as the I-section equipment, II-section equipment, III-section equipment and IV-section equipment; the first section 3 of the header is provided with CaCO₃A chemical adding port and a stirrer 7, wherein the I section 3 of the header is used for realizing the wastewater entering from the water inlet of the I section 3 of the header and the CaCO of the I section 3 of the header₃CaCO added at the medicine adding port₃Mixing and reacting; the second section 4 of the header is provided with a backflow water inlet and a stirrer 7, the second section 4 of the header is used for mixing wastewater entering from a water inlet of the second section 4 of the header with backflow water added from a backflow water inlet of the second section 4 of the header for reaction, wherein the backflow water is wastewater treated by an anaerobic reactor 11; the third section 5 of the header is provided with a PAC dosing port and a stirrer 7, and the third section 5 of the header is used for mixing wastewater entering from a water inlet of the third section 5 of the header with the PAC added from the PAC dosing port of the third section 5 of the header for coagulation reaction; the IV section 6 of the header is provided with a PAM dosing port and a stirrer 7, and the IV section 6 of the header is used for mixing wastewater entering from a water inlet of the IV section 6 of the header with PAM added from the PAM dosing port of the IV section 6 of the header to perform flocculation reaction; the effective volumes of the first section 3 of the header, the second section 4 of the header, the third section 5 of the header and the fourth section 6 of the header are respectively 0.85m³、0.85m³、1.70m³、1.70m³；

The water outlet of the adjusting tank 1 is connected with the water inlet of the first section 3 of the header, and a lift pump 2 is arranged on a connecting pipeline between the water outlet of the adjusting tank 1 and the water inlet of the first section 3 of the header; the lift pump 2 comprises a backup 2 slurry pumps, and the flow of the lift pump 2 is 5m³H, the lift is 30 m;

the water outlet of the first section 3 of the header is connected with the water inlet of the second section 4 of the header, the water outlet of the second section 4 of the header is connected with the water inlet of the third section 5 of the header, the water outlet of the third section 5 of the header is connected with the water inlet of the fourth section 6 of the header, the water outlet of the fourth section 6 of the header is used as the water outlet of the pretreatment unit and is connected with the water inlet of the air flotation tank 9, the water outlet of the air flotation tank 9 is connected with the water inlet of the sand filter 10, the water outlet of the sand filter 10 is connected with the water inlet of the anaerobic reactor 11, and the water outlet of the anaerobic reactor 11 is respectively connected with the water inlet of the desulfurizing and denitrifying reactor;

a connecting pipeline between the water outlet of the header IV section 6 and the water inlet of the air floatation tank 9 is communicated with the dissolved air tank 8 to provide the air required by air floatation to the air floatation tank; the effective volume of the air floatation tank is 1.7m of the tank depth and 1.7m of the effective volume³；

A filter material layer and a gravel bearing layer arranged at the lower part of the filter material layer are arranged in the sand filter 10; the filter material of the filter material layer is quartz sand and ceramsite, the thickness of the filter material layer is 50cm, the thickness of the quartz sand is 30cm, and the filtering speed of the filter material layer is 5-7 m/h; the thickness of the gravel bearing layer is 100-200 mm;

the anaerobic reactor 11 is an up-flow anaerobic filter tank made of glass fiber reinforced plastics and has an effective volume of 30m³The height of the filler (ceramic filler is selected) is 2.5m, and a support plate of the filler is a porous plate; a large amount of SRB grows in the anaerobic reactor 11 (SRB adheres to the packing in the anaerobic reactor 11);

the desulfurization and denitrification reactor 12 is a facultative anaerobic reactor, the material of the desulfurization and denitrification reactor 12 is glass fiber reinforced plastic, and the effective volume is 25m³(ii) a A large amount of T.D grows in the desulfurization and denitrification reactor 12; an air inlet device is arranged on a connecting pipeline between the water outlet of the anaerobic reactor 11 and the water inlet of the desulfurization and denitrification reactor 12, and the ORP of the facultative anaerobic environment of the desulfurization and denitrification reactor 12 is controlled by controlling the intermittent air inlet of the air inlet device;

the adjusting tank 1 is provided with a mud collecting hopper for collecting sediments generated when the wastewater is treated in the adjusting tank 1, and the mud collecting hopper is connected with a filter press I13; the bottom of the header is provided with a mud bucket for collecting waste water when the waste water is treated in a first section 3 of the header, a second section 4 of the header, a third section 5 of the header and a fourth section 6 of the headerThe generated sediment is connected with a filter press I13 through the mud accumulation hopper; the filter area of the filter press I13 is 100m²(ii) a Wherein, a mud discharge screw pump is arranged on a connecting pipeline of the mud accumulation hopper and the filter press I13, and the flow of the mud discharge screw pump is 40m³The pump head is 120m, and the mud discharging screw pump provides power for discharging the mud in the mud collecting hopper to the filter press I13;

a sludge accumulation hopper is arranged at the bottom of the denitrification reactor 12 and is used for collecting precipitates generated when the wastewater is treated in the denitrification reactor 12, and the sludge accumulation hopper is connected with a filter press II 14; filter press I14 has a filter area of 100m²(ii) a Wherein, a mud discharge screw pump is arranged on a connecting pipeline of the mud accumulation hopper and the filter press II 14, and the flow rate of the mud discharge screw pump is 40m³And the pump head is 120m, and the mud discharging screw pump provides power for discharging the mud in the mud collecting hopper to the filter press II 14.

Experimental example 1

This experimental example provides a method for treating wastewater of an activated carbon desulfurization and denitrification system using the apparatus for treating wastewater of an activated carbon desulfurization and denitrification system provided in example 1, the method being used for treating salt production wastewater of an activated carbon/activated coke desulfurization and denitrification system of a certain sintering machine, the salt production wastewater including three types of wastewater with the numbers 1 and 2, and the sources and the qualities of the wastewater being shown in table 1, and the method specifically comprising:

TABLE 1

Step 1): the wastewater to be treated enters the regulating tank 1 for pretreatment, the Hydraulic Retention Time (HRT) is 8.5h, the wastewater to be treated enters the regulating tank 1 and then stays, so that the water quantity and the water quality of the wastewater to be treated are regulated (homogenized) to a certain extent, the wastewater is stored when subsequent equipment is maintained, particles which are easy to precipitate in the wastewater are precipitated in a mud bucket of the regulating tank 1, and precipitates in the mud bucket entering the regulating tank 1 are discharged into a filter press I13 for filter pressing and water removal;

step 2): the wastewater treated in the step 1) enters a first section 3 of the header, CaCO is added into the wastewater of the first section 3 of the header at the rotating speed of 120r/min₃(the CaCO)₃Using 325 mesh sieve with 90% purity > 95%) to partially neutralize acidic waste water, and controlling CaCO by pH feedback₃Added in an amount of F in the wastewater^-With Ca²⁺Reaction to form insoluble CaF₂Thereby removing F^-And the SO in the wastewater is reserved₃ ^2-、SO₄ ^2-(ii) a As in the wastewater during this time³⁺With Ca²⁺Complexing to form Ca (AsO)₃)₂Removing As by using insoluble substance³⁺(ii) a The hydraulic retention time of the wastewater in the first section 3 of the header is 10 min;

step 3): the wastewater treated in the step 2) enters a second section 4 of the header, and reflux water is added into the wastewater in the second section 4 of the header at the rotating speed of 120r/min, wherein the reflux water is the second part (namely the reflux part) of the wastewater obtained after the treatment in the step 8); heavy metals in the wastewater treated in the step 2) and alkalinity substances (S) in the return water^2-、CO₃ ^2-、OH^-) Precipitate generated by the reaction is removed; the hydraulic retention time of the wastewater in the second section 4 of the header is 10 min;

step 4): the wastewater treated in the step 3) enters a third section 5 of the header, and PAC is added into the wastewater in the third section 5 of the header at the rotating speed of 120r/min for full coagulation; the hydraulic retention time of the wastewater in the third section 5 of the header is 20 min;

step 5): feeding the wastewater treated in the step 4) into the IV section 6 of the header, and adding PAM into the wastewater in the IV section 6 of the header at the rotating speed of 60r/min for full flocculation; the hydraulic retention time of the wastewater in the section IV of the header 6 is 20 min;

step 6): the wastewater treated in the step 5) enters an air floatation tank 9 for air floatation deslagging and oil removal treatment, specifically, bubbles with a certain size are introduced into the wastewater, and suspended particles and precipitates in the wastewater are removed; the hydraulic retention time of the wastewater in the air floatation tank 9 is 20 min;

step 7): the wastewater treated in the step 6) enters a sand filter 10 to be filtered so as to further remove suspended matters;

step 8): the wastewater treated in the step 7) enters an anaerobic reactor 11, and is treated in an anaerobic environment with an external carbon source (anaerobic hydrolysis acidification domestic sewage, COD in the anaerobic hydrolysis acidification domestic sewage and SO in the wastewater to be treated)₃ ^2-And SO₄ ^2-The ratio of the total mass of the organic acid to the sulfate reducing bacteria) is between 0.6 and 3.0), SRB (sulfate reducing bacteria) is utilized to carry out first biological treatment on the wastewater treated in the step 7), and SO in the wastewater is treated₃ ^2-/SO₄ ^2-Reduction to S^2-Reacting NH₄ ⁺Conversion to NO₃ ^-(ii) a Dividing the wastewater obtained after the first biological treatment into two parts, continuously performing the subsequent treatment on the first part, performing reflux on the second part as reflux water, mixing the reflux water with the wastewater treated in the step 2) to realize the specific operation of the step 3), wherein the reflux water amount is 0.5m³H; the hydraulic retention time of the wastewater in the anaerobic reactor 11 is 6 h;

step 9): the wastewater treated in the step 8) enters a desulfurization and denitrification reactor 12, and a first part of the wastewater obtained after the first biological treatment is subjected to a second biological treatment by using T.D (thiobacillus denitrificans) under a facultative anaerobic environment to treat S in the wastewater^2-Oxidation to elemental sulphur S⁰And NO in the wastewater₃ ^-Reduction to N₂，S⁰Deposited in a sludge hopper at the bottom of the desulfurization and denitrification reactor 12 and dehydrated and recycled by a filter press II 14; the hydraulic retention time of the wastewater in the desulfurization and denitrification reactor 12 is 5 h; thus, the wastewater treatment is completed.

F in the wastewater treated by the treatment method^-、SO₃ ^2-、SO₄ ^2-、NH₄ ⁺Heavy metal ions and grease are effectively removed, and the treated wastewater reaches the indirect discharge standard in the Steel industry Water pollutant discharge Standard GB 13456-2012.

Claims

1. The utility model provides a processing apparatus of active carbon SOx/NOx control system waste water which characterized in that, the device includes:

the pretreatment unit is used for realizing F removal^-The wastewater and the return water are mixed to react and neutralize the acidic wastewater and remove heavy metals, and coagulation and flocculation reactions are realized; wherein the return water is the wastewater treated by the anaerobic reactor;

2. The device according to claim 1, wherein the pretreatment unit comprises a section I device, a section II device, a section III device and a section IV device which are connected in sequence, wherein the section I device is provided with a dosing port, and the section II device is provided with a backflow water inlet; a water outlet of the IV-section equipment is used as a water outlet of the pretreatment unit and is connected with a water inlet of the solid-liquid separation equipment; a return water inlet of the II-section equipment is connected with a water outlet of the anaerobic reactor; the I-section equipment is used for carrying out mixed reaction of wastewater and medicines to remove F^-(ii) a The II stage of equipment is used for realizing the mixed reaction of the wastewater and the backflow water to neutralize the acidic wastewater and remove heavy metal ions; the III-section equipment is coagulation reaction equipment; the IV-section equipment is flocculation reaction equipment.

3. The apparatus of claim 2,

the section III equipment is provided with a dosing port and is used for mixing wastewater and a medicament to perform a coagulation reaction;

the IV-section equipment is provided with a medicine feeding port and is used for realizing the flocculation reaction of the mixture of the wastewater and the medicine.

4. The apparatus according to any one of claims 1 to 3,

at least one dosing port and CaCO of the pretreatment unit₃A supply device connection;

at least one dosing port of the pretreatment unit is connected with polyaluminium feeding equipment;

at least one dosing port of the pretreatment unit is connected with polyacrylamide supply equipment.

5. The apparatus as claimed in claim 2, wherein the section I equipment dosing port is connected with CaCO₃The supply device is connected.

6. The apparatus of claim 3,

the III-section equipment dosing port is connected with polyaluminium supply equipment;

and the IV-section equipment dosing port is connected with polyacrylamide supply equipment.

7. The device according to any one of claims 1 to 3, wherein the solid-liquid separation equipment comprises an air flotation tank and a sand filter tank, a water outlet of the air flotation tank is connected with a water inlet of the sand filter tank, a water inlet of the air flotation tank is used as a water inlet of the solid-liquid separation equipment and is connected with a water outlet of the pretreatment unit, and a water outlet of the sand filter tank is used as a water outlet of the solid-liquid separation equipment and is connected with a water inlet of the anaerobic reactor; wherein, the air supporting pond is connected with dissolved gas jar and is realized carrying out air supporting slagging-off, deoiling to the waste water in the air supporting pond.

8. The apparatus of any one of claims 1-3, wherein the anaerobic reactor comprises at least one of an upflow anaerobic filter, an anaerobic trickling tower, and an upflow anaerobic sludge bed reactor.

9. The apparatus according to any one of claims 1 to 3,

sulfate reducing bacteria grow in the anaerobic reactor;

thiobacillus denitrificans grows in the desulfurization and denitrification reactor.

10. The apparatus according to any one of claims 1 to 3,

the device is further provided with an adjusting tank, a water outlet of the adjusting tank is connected with a water inlet of the pretreatment unit, and the adjusting tank is used for realizing water quantity and water quality adjustment and preliminary precipitation of particles;

the desulfurization and denitrification reactor is provided with an air inlet.