CN112062320B - Green and efficient inorganic wastewater total nitrogen removal process - Google Patents

Green and efficient inorganic wastewater total nitrogen removal process Download PDF

Info

Publication number
CN112062320B
CN112062320B CN202010472110.3A CN202010472110A CN112062320B CN 112062320 B CN112062320 B CN 112062320B CN 202010472110 A CN202010472110 A CN 202010472110A CN 112062320 B CN112062320 B CN 112062320B
Authority
CN
China
Prior art keywords
tank
value
aeration
wastewater
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010472110.3A
Other languages
Chinese (zh)
Other versions
CN112062320A (en
Inventor
宋亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Guorui Technology Co ltd
Original Assignee
Jiangsu Guorui Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Guorui Technology Co ltd filed Critical Jiangsu Guorui Technology Co ltd
Priority to CN202010472110.3A priority Critical patent/CN112062320B/en
Publication of CN112062320A publication Critical patent/CN112062320A/en
Application granted granted Critical
Publication of CN112062320B publication Critical patent/CN112062320B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/58—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C3/00—Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor
    • 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
    • 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
    • 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
    • C02F1/70—Treatment of water, waste water, or sewage by reduction
    • C02F1/705—Reduction by metals
    • 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
    • C02F2101/163—Nitrates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention provides a green high-efficiency inorganic wastewater total nitrogen removal process, which mainly adopts the principle that nitrate radical can perform oxidation-reduction reaction with metal aluminum under the alkaline condition to be converted into ammonia gas, the ammonia gas is introduced into a specific acidic absorption liquid through aeration and air blast to obtain an ammonium salt solution with higher purity, and the solution can be directly used for producing a compound fertilizer; the waste water after the removal of nitrate radicals through aeration is alkaline and can be used as a waste acid neutralization treatment agent of an enterprise, and aluminum hydroxide solid is obtained after filter pressing; the raw materials (except for liquid caustic soda) used in the process are three-waste products in the production process of enterprises, other reagents are not required to be added additionally, the cost is low, the economic benefit is high, the process is safe and clean, and the automation degree is high.

Description

Green and efficient inorganic wastewater total nitrogen removal process
Technical Field
The invention relates to the technical field of total nitrogen removal, in particular to a green and efficient inorganic wastewater total nitrogen removal process.
Background
The total nitrogen is an important index for wastewater discharge reaching the standard, mainly refers to the sum of various organic state and inorganic nitrogen in water, and the process mainly discusses inorganic nitrogen. The common inorganic nitrogen in the wastewater refers to inorganic ammonium salt, nitrate, nitrite and the like. Compared with the biological treatment method of organic nitrogen, the inorganic high total nitrogen wastewater is difficult to carry out denitrification treatment by adopting a biological method due to the reasons of pH, salt content, the need of additionally adding a C source necessary for microorganism growth and the like. With the increasingly strict environmental protection requirements, the pressure of enterprises on environmental protection is increasing, and the requirement of a green and efficient total nitrogen removal process is urgent.
Disclosure of Invention
Technical problem to be solved
The main principle of the invention is that nitrate radical can generate oxidation-reduction reaction with metal aluminum under alkaline condition to be converted into ammonia gas, the ammonia gas is introduced into specific acid absorption liquid through aeration and blast air to obtain ammonium salt solution with higher purity, and the solution can be directly used for producing compound fertilizer; the waste water after the removal of nitrate radical through aeration is alkaline and can be used as a waste acid neutralization treatment agent of the enterprise, and aluminum hydroxide solid is obtained after filter pressing. The specific reaction principle is as follows:
3NO 3- +8Al+5OH - +2H 2 O→8AlO 2- +NH 3 ↑
AlO 2 - +H + +H 2 O→Al(OH) 3 ↓
wherein Al and H + All are waste materials in the production process of enterprises, and the additional medicament cost is not required to be increased.
(II) the technical scheme adopted
In order to achieve the purpose, the invention is realized by the following technical scheme: a green high-efficiency inorganic wastewater total nitrogen removal process comprises the following steps:
(1) Starting a water valve of the first-stage absorption tank and the second-stage absorption tank, adding water with the volume about 2/3 of that of the absorption tanks, and starting a self-circulation system (namely a circulation system formed by the first-stage absorption tank or the second-stage absorption tank and a material transfer pump) of the first-stage absorption tower and the second-stage absorption tower; opening a sulfuric acid valve, slowly adding the metered waste sulfuric acid for multiple times, circulating for 30min after the sulfuric acid is added, sampling and detecting the concentration of the sulfuric acid, and if the acid content is qualified, replenishing the waste sulfuric acid until the waste sulfuric acid is qualified if the acid content is 3-4 mol/L;
(2) Starting a waste water inlet valve and a waste water transferring pump of an aeration tank, transferring waste water with the volume about 2/3 of that of the aeration tank, starting a self-circulation system (namely a circulation system formed by the aeration tank and the transferring pump) of the aeration tank, opening a liquid alkali valve, adding metered liquid alkali, and circulating for 10min to detect the pH value; if the pH value is more than 11, adding the crushed aluminum slag, otherwise, adding caustic soda liquid until the pH value is more than 11;
(3) Starting a fan of the aeration tank, and adjusting the air inlet flow, wherein the larger the air inlet flow is, the better the air inlet flow is, and the condition that no ammonia odor exists on site is suitable; slowly opening a low-pressure steam valve of the aeration tank, heating until the temperature of the aeration tank is 55-60 ℃, adjusting steam pressure, preserving heat and aerating; adding liquid caustic soda to a pH value of more than 11 when the pH value is reduced after detection for one time within 10min in the aeration process; continuously aerating until the pH value is not reduced, and ending aeration; sampling and detecting ammonia nitrogen total nitrogen in the aeration tank wastewater, and transferring the wastewater to a neutralization tank for waste acid neutralization after the wastewater is qualified; the aeration tank continues to feed according to the step 2);
(4) Periodically detecting the pH value of the primary absorption tank, adding a proper amount of liquid caustic soda to adjust the pH value to 6-7 if the pH value is more than 4, transferring the liquid in the primary absorption tank into an evaporation kettle for concentration, and then transferring waste acid in the secondary absorption tank into the primary absorption tank; the secondary canisters were reconstituted according to step 1).
In order to realize automatic control, the aeration tank, the primary absorption tank and the secondary absorption tank need to be interlocked with high and low liquid levels (not shown in the figure), and the material transferring pump is interlocked and automatically closed when the material transferring reaches the high and low liquid levels;
in order to realize automatic control, online pH detection (not shown in the figure) is added in an aeration tank and a primary absorption tank, and a pH abnormity alarm (not shown in the figure) and a liquid caustic soda sulfuric acid valve (not shown in the figure) are linked;
in order to reduce the unorganized emission of tail gas, an ammonia gas concentration detection device (not shown in the figure) is added at a vent of the secondary absorption tank (namely tail gas absorption of the secondary absorption tank), and an overproof alarm (not shown in the figure) and an aeration tank fan power supply are linked;
in order to realize recycling; step 4), concentrating and filter-pressing; the mother liquor is transferred to a secondary absorption tank for preparing absorption liquid.
(III) advantageous effects
The invention provides a green and efficient inorganic wastewater total nitrogen removal process, which has the following beneficial effects:
the raw materials (except for liquid caustic soda) used in the process are three-waste products in the production process of enterprises, other reagents are not required to be added additionally, the cost is low, the economic benefit is high, the process is safe and clean, and the automation degree is high.
Drawings
The invention is further illustrated below with reference to the accompanying drawings:
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a process diagram of the apparatus of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1 and 2, a green and efficient process for removing total nitrogen from inorganic wastewater, the process comprises the following steps:
(1) Opening water valves of the first-stage absorption tank and the second-stage absorption tank, adding water with the volume about 2/3 of that of the absorption tanks, and opening a self-circulation system of the first-stage absorption tower and the second-stage absorption tower; opening a sulfuric acid valve, slowly adding the measured waste sulfuric acid for multiple times, circulating for 30min after the sulfuric acid is added, sampling and detecting the concentration of the sulfuric acid, and if the acid content is 3-4mol/L qualified, replenishing the waste sulfuric acid until the waste sulfuric acid is qualified;
(2) Opening a wastewater inlet valve and a wastewater transfer pump of an aeration tank, transferring wastewater with the volume about 2/3 of that of the aeration tank, opening a self-circulation system of the aeration tank, opening a liquid caustic soda valve, adding metered liquid caustic soda, and circulating for 10min to detect pH; if the pH value is more than 11, adding the crushed aluminum slag, otherwise, adding liquid caustic soda until the pH value is more than 11;
(3) Starting a fan of the aeration tank, and adjusting the air inlet flow, wherein the larger the air inlet flow is, the better the air inlet flow is, and the better the condition that no ammonia odor exists on site is; slowly opening a low-pressure steam valve of the aeration tank, heating until the temperature of the aeration tank is 55-60 ℃, adjusting steam pressure, preserving heat and aerating; adding liquid caustic soda to a pH value of more than 11 when the pH value is reduced after detection for one time within 10min in the aeration process; continuously aerating until the pH value is not reduced, and ending aeration; sampling and detecting ammonia nitrogen total nitrogen in the aeration tank wastewater, and transferring the wastewater to a neutralization tank for waste acid neutralization after the wastewater is qualified; the aeration tank continues to feed according to the step 2);
(4) And (3) periodically detecting the pH value of the primary absorption tank, adding a proper amount of liquid caustic soda to adjust the pH value to 6-7 if the pH value is more than 4, transferring the mixture into an evaporation kettle for concentration, transferring waste acid in the secondary absorption tank into the primary absorption tank, and preparing the waste acid in the secondary absorption tank again according to the step 1).
In order to realize automatic control, the high and low liquid levels of the aeration tank, the primary absorption tank and the secondary absorption tank need to be interlocked, and the material transferring pump is interlocked and automatically closed when the material transferring reaches the high and low liquid levels;
in order to realize automatic control, online pH detection is required to be added in an aeration tank and a primary absorption tank, and pH abnormity alarm and a liquid caustic soda sulfuric acid valve are linked;
in order to reduce the unorganized emission of tail gas, an ammonia concentration detection device is added at the vent of the secondary absorption tank, and an overproof alarm and an aeration tank fan power supply are linked;
in order to realize the recycling of the mother liquor after concentration and filter pressing in the step 4), the mother liquor is transferred to a secondary absorption tank for preparing absorption liquid;
the raw materials (except liquid caustic soda) used in the process are three-waste products in the production process of enterprises, other reagents do not need to be added additionally, the cost is low, the economic benefit is high, the process is safe and clean, and the automation degree is high.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (1)

1. A green high-efficiency inorganic wastewater total nitrogen removal process is characterized by comprising the following steps:
(1) Opening water valves of the first-stage absorption tank and the second-stage absorption tank, adding 2/3 of the volume of water in the absorption tanks, and opening self-circulation systems of the first-stage absorption tower and the second-stage absorption tower; opening a sulfuric acid valve, slowly adding the metered waste sulfuric acid for multiple times, circulating for 30min after the sulfuric acid is added, sampling and detecting the concentration of the sulfuric acid, and if the acid content is qualified, replenishing the waste sulfuric acid until the waste sulfuric acid is qualified if the acid content is 3-4 mol/L;
(2) Opening a wastewater inlet valve and a wastewater transfer pump of an aeration tank, transferring 2/3 volume of wastewater into the aeration tank, opening a self-circulation system of the aeration tank, opening a liquid caustic soda valve, adding metered liquid caustic soda, and circulating for 10min to detect pH; if the pH value is more than 11, adding the crushed aluminum slag, otherwise, supplementing liquid caustic soda until the pH value is more than 11;
(3) Starting a fan of the aeration tank, and adjusting the air inlet flow, wherein the larger the air inlet flow is, the better the air inlet flow is, and the condition that no ammonia odor exists on site is suitable; slowly opening a low-pressure steam valve of the aeration tank, heating until the temperature of the aeration tank is 55-60 ℃, adjusting steam pressure, preserving heat and aerating; adding liquid alkali to pH value more than 11 if pH value is reduced after detecting once every 10min in the aeration process; continuously aerating until the pH value does not fall any more, and ending aeration; sampling and detecting ammonia nitrogen total nitrogen in the aeration tank wastewater, and transferring the wastewater to a neutralization tank for waste acid neutralization after the wastewater is qualified; the aeration tank continues to feed materials according to the step (2);
(4) Periodically detecting the pH value of the primary absorption tank, adding a proper amount of liquid caustic soda to adjust the pH value to 6-7 if the pH value is more than 4, transferring the liquid in the primary absorption tank into an evaporation kettle for concentration, and then transferring waste acid in the secondary absorption tank into the primary absorption tank; the secondary canister was reconstituted according to step (1).
CN202010472110.3A 2020-05-29 2020-05-29 Green and efficient inorganic wastewater total nitrogen removal process Active CN112062320B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010472110.3A CN112062320B (en) 2020-05-29 2020-05-29 Green and efficient inorganic wastewater total nitrogen removal process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010472110.3A CN112062320B (en) 2020-05-29 2020-05-29 Green and efficient inorganic wastewater total nitrogen removal process

Publications (2)

Publication Number Publication Date
CN112062320A CN112062320A (en) 2020-12-11
CN112062320B true CN112062320B (en) 2022-10-25

Family

ID=73657039

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010472110.3A Active CN112062320B (en) 2020-05-29 2020-05-29 Green and efficient inorganic wastewater total nitrogen removal process

Country Status (1)

Country Link
CN (1) CN112062320B (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205668981U (en) * 2015-10-26 2016-11-02 恒扬（韶关）工业有限公司 Sewage disposal reutilization system
CN205653196U (en) * 2016-05-16 2016-10-19 安徽圣诺贝化学科技有限公司 High acid high ammonia -nitrogen concentration effluent disposal system

Also Published As

Publication number Publication date
CN112062320A (en) 2020-12-11

Similar Documents

Publication Publication Date Title
CN107857426B (en) Comprehensive treatment method for phosphorus-containing wastewater
CN101602555A (en) High ammonia nitrogen water treatment method and equipment
EP2619144B1 (en) Method for purifying wastewater with ammonium removal
CN104591435B (en) A kind of processing method of industrial wastewater
CN104609665A (en) Glyphosate-producing wastewater treatment integration technology
US10421674B2 (en) Process and plant for separating off and/or recovering nitrogen compounds from a liquid or sludge substrate
CN104628184A (en) Method for treating formaldehyde wastewater by use of calcined hydrotalcite
CN112062320B (en) Green and efficient inorganic wastewater total nitrogen removal process
JP2007105627A (en) Method for treating nitrate-containing waste liquid and device therefor
CN105016527A (en) High COD wastewater subcritical Fenton treatment system and treatment method
US4402837A (en) Process for treatment of a liquid containing a nickel cyanide compound
US11364463B2 (en) Apparatus and method for recovering effective resources including nitrogen and phosphorus
CN204752423U (en) System for softening coal fired power plant desulfurization waste water
JPH08141592A (en) Anaerobic treatment method
CN106673292B (en) Coal gasification ash water pretreatment method
CN107697969A (en) A kind of system and method for reducing biogas slurry ammonia nitrogen concentration
US11851346B2 (en) Creation of an iron product for wastewater treatment
CN104609545B (en) Method and apparatus for biochemical treatment of high concentration nitrate wastewater
CN113480098A (en) Separated type MAP-anaerobic membrane distillation biological reaction mariculture wastewater treatment system
CN111807626A (en) Wastewater treatment system and process for sludge and blue-green algae synergistic deep dehydration
JP6435108B2 (en) Denitrification device and method of operating denitrification device
CN215938883U (en) Automatic Fenton reactor
CN215946982U (en) Comprehensive treatment system for waste gas of thermal power plant
US20230042185A1 (en) Creation of an iron product for wastewater treatment
CN217677155U (en) High-concentration ammonia nitrogen wastewater treatment device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant