CN101186420A - Odor Control System of Sludge Drying Project - Google Patents

Abstract

The invention discloses an odor control system for a sludge drying project. The high-energy ion generator of the system is respectively connected with the sludge storage system and the air mixing chamber through the ventilation pipe, and the air mixing chamber is connected with the sludge drying and granulation device, the water film granite dedusting and degassing device, and the chimney. The storage system is connected with the biological soil filter bed, and connected with the independent heat source, temperature regulator, sludge drying and granulation device, and the sludge drying workshop is respectively connected with the sludge storage system and the drying sewage The sludge finished product warehouse is connected, and the dried sludge finished product warehouse and the sludge drying workshop are connected with the biological soil filter bed through ventilation pipes. The invention integrates chemical, physical and biological deodorization methods, and uses the new technology of ion deodorization, which not only has a high odor removal rate, but also has an emergency function. Practice shows that the odor emission content of this technology is far lower than the national standard. Discharge standards, the surrounding environment of the sludge drying project and the production site have no odor, so that the sludge drying can achieve clean production.

Description

Odor Control System of Sludge Drying Project

technical field

The invention relates to an odor control system of a sludge drying project.

Background technique

Urban domestic sewage and industrial wastewater must be treated to meet the standards before they can be discharged. This is an important measure for modern environmental protection. However, when urban sewage is purified, it will produce an amount equivalent to 0.3% to 0.5% of the volume of sewage or 1% to 1% of the quality of sewage. 2% sludge. According to relevant data, by 2010 and 2020, the discharge of urban sewage in China will reach 440×10 ⁸ m ³ /day and 536×10 ⁸ m ³ /day respectively. With the rapid development of the national economy and the rapid growth of urban population , the amount of urban sewage is constantly increasing, and at the same time, people's requirements for environmental quality are getting higher and higher. The treatment rate of industrial wastewater and urban domestic sewage will also continue to increase, and the amount of sludge produced by sewage treatment plants will increase day by day.

Sewage treatment plant sludge is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles and colloids. Since most of the pollutants in the sewage are transferred to the sludge, this determines the quality of the sewage. The sludge produced by the treatment plant has the characteristics of high water content, large quantity, and enrichment of high-concentration pollutants. If this urban sludge is not properly treated, it will cause secondary pollution and cause serious damage to the ecological environment. Therefore, the safe disposal of municipal sludge is a common problem faced by the whole world, and the harmless, reduction and resource treatment of sludge has become the common goal of completely eliminating the secondary pollution of municipal sludge at home and abroad.

Over the years, experts and technicians at home and abroad, through the practice of various sludge treatment methods, have reached a consensus that sludge drying first reduces the amount of sludge, and finally realizes the harmless and resourceful treatment of sludge. The necessary process and key link. The sludge produced from the sewage treatment plant, through mechanical dehydration, generally has a moisture content between 75% and 85%. Through the drying process, if the moisture content of the sludge is reduced to below 40%, the volume can be reduced by two-thirds Above, we have invented the method of using independent heat source or waste heat of flue gas to dry sludge, and established an effective process and developed mechanical equipment matching the process, so that the sludge drying energy can be reduced It can be carried out continuously at a low operating cost, which can not only reduce the amount of sludge significantly, but also preserve more than 90% of the original heat value of the sludge, making the sludge a usable resource.

Because the sludge contains a large amount of organic pollutants, under the action of microorganisms, the sludge will produce a large amount of odor. The material composition of the odor can be divided into 4 categories. The first category is sulfur-containing compounds, such as hydrogen sulfide, sulfur Alcohols, thioethers, and phagephages, etc.; the second category is nitrogen-containing compounds, such as ammonia, amines, phthalamines, and indoles; the third category is hydrocarbon compounds, such as alkanes, alkenes, and alkynes and aromatic hydrocarbons, etc.; the fourth category is oxygen-containing organic compounds, such as alcohols, aldehydes, ketones, phenols, and organic acids, among which odors with relatively high concentrations and relatively large impacts include ammonia, hydrogen sulfide, methyl mercaptan, and propyl sulfide. Alcohol, methyl sulfide, etc. In the sludge drying project, the sludge storage pretreatment stage is the main release source of these odors. In the sludge drying and granulation stage, as well as the drying sludge cooling stage, although the microorganisms in the sludge have almost It is zero, and there is no condition for generating new odor, but the original odor substances in the sludge will be released in large quantities at this time. The spread of odor will seriously damage the quality of the air environment and directly affect human health and work efficiency. Even if a small amount of odorous substances enter the environment, it will make people feel uncomfortable, headache, dizziness, nausea, vomiting, loss of appetite and listlessness Concentration and other symptoms, long-term work in the air environment polluted by odor, the incidence of various inflammations increases, and it also affects the respiratory system, circulatory system, digestive system and reproductive system. In order to completely eliminate the odor released in the sludge drying project, we have established an odor control system in the sludge drying project according to the characteristics of the odor release in different stages of the sludge drying project, combined with the specific process conditions, so that The sludge drying can be carried out in a clean production working environment.

Contents of the invention

The object of the present invention is to provide an odor control system for sludge drying engineering.

The odor control system of the sludge drying project has a high-energy ion generator. The high-energy ion generator is connected to the sludge storage tank through the first ventilation duct, or the high-energy ion generator is connected to the closed sludge storage tank through the second ventilation duct. The high-energy ion generator is connected to the air mixing chamber through the third ventilation pipe, the air mixing chamber is connected to the sludge drying and granulation device through the eighth ventilation pipe, and the air mixing chamber is connected to the water film granite dedusting and degassing device , the fifth induced draft fan and the chimney are connected, the sludge storage tank or the closed sludge storage tank constitutes the sludge storage system, and the sludge storage system is connected to the biological soil filter bed through the second induced draft fan and the fifth ventilation pipe, or The sludge storage system is connected to the independent heat source through the first induced draft fan through the fourth ventilation pipe, the independent heat source is connected to the sludge drying and granulating device through the temperature regulator, and the waste heat of the flue gas is connected to the sludge drying and granulating device The sludge drying and granulating device, the first closed conveyor belt, and the second closed conveyor belt constitute the sludge drying workshop, and the sludge drying workshop is connected with the sludge storage system through the second closed conveyor belt connection, the sludge drying workshop is connected to the biological soil filter bed through the fourth induced draft fan and the seventh ventilation pipe, and the sludge drying and granulation device is connected to the dried sludge finished product warehouse through the first closed conveyor belt. The finished product warehouse of dried sludge is connected with the biological soil filter bed through the third induced draft fan and the sixth ventilation pipe.

A first ultraviolet lamp is provided in the sludge storage tank, and a second ultraviolet lamp is provided in the closed sludge storage tank,

The present invention has the beneficial effects: 1) In the whole sludge drying project, from sludge storage to sludge drying, until the cooling of dried sludge is carried out under closed and negative pressure conditions, avoiding the foul smell Spillover; 2) Integrate chemical, physical and biological deodorization methods, especially the use of high-tech ion deodorization, which not only greatly improves the deodorization effect, but also has the characteristics of small footprint, simple installation and commissioning, and low operating costs; 3) The odor control system not only has a high odor removal rate, but also has an emergency function. Therefore, even if an accident occurs during the sludge drying process and the production is stopped, the normal operation of the deodorization system will not be affected. The present invention has been put into practical use in many sludge drying projects. Practice shows that the odor emission content of this technology is far lower than the national emission standard, and the surrounding environment and production site of the sludge drying project have no odor. , Realized the clean production of sludge drying.

Description of drawings

The attached drawing is a schematic structural diagram of the odor control system of the sludge drying project;

In the figure: high-energy ion generator 1, sludge storage tank 2, closed sludge storage 3, independent heat source 4, flue gas waste heat 5, sludge drying and granulation device 6, dried sludge finished product warehouse 7, Biological soil filter bed 8, water film granite dedusting and degassing device 9, chimney 10, first induced draft fan 11, second induced draft fan 12, third induced draft fan 13, fourth induced draft fan 14, temperature regulator 15, air mixing chamber 16. The first ventilation duct 17, the second ventilation duct 18, the third ventilation duct 19, the fourth ventilation duct 20, the fifth ventilation duct 21, the sixth ventilation duct 22, the seventh ventilation duct 23, the eighth ventilation duct 24, The fifth induced draft fan 25 , the first ultraviolet lamp 26 , the second ultraviolet lamp 27 , the first enclosed conveyor belt 28 , the second enclosed conveyor belt 29 , the sludge storage system 30 , and the sludge drying workshop 31 .

Detailed ways

As shown in the accompanying drawings, the odor control system of the sludge drying project is characterized in that it has a high-energy ion generator 1, and the high-energy ion generator 1 is connected to the sludge storage tank 2 through the first ventilation pipe 17, or the high-energy ion generator 1 The generator 1 is connected to the closed sludge storage 3 through the second ventilation duct 18, the high-energy ion generator 1 is connected to the air mixing chamber 16 through the third ventilation duct 19, and the air mixing chamber 16 is connected to the air mixing chamber 16 through the eighth ventilation duct 24. The sludge drying and granulation device 6 is connected, the air mixing chamber 16 is connected with the water film granite dedusting and degassing device 9, the fifth induced draft fan 25, and the chimney 10, the sludge storage tank 2 or the closed sludge storage 3 To form a sludge storage system 30, a first ultraviolet lamp 26 is provided in the sludge storage tank 2, a second ultraviolet lamp 27 is provided in the closed sludge storage 3, and the sludge storage system 30 passes through the second induced draft fan 12. The fifth ventilation pipe 21 is connected with the biological soil filter bed 8, or the sludge storage system 30 is connected with the vertical heat source 4 through the first induced draft fan 11 through the fourth ventilation pipe 20, and the independent heat source 4 is connected with the sludge through the temperature regulator 15. The drying and granulating device 6 is connected, the flue gas waste heat 5 is connected with the sludge drying and granulating device 6, the sludge drying and granulating device 6, the first closed conveyor belt 28, the second closed conveyor The belt 29 constitutes a sludge drying workshop 31, the sludge drying workshop 31 is connected with the sludge storage system 30 through the second closed conveyor belt 29, and the sludge drying workshop 31 passes through the seventh ventilation duct through the fourth induced draft fan 14 23 is connected with the biological soil filter bed 8, the sludge drying and granulating device 6 is connected with the dried sludge finished product warehouse 7 through the first closed conveyor belt 28, and the dried sludge finished product warehouse 7 is passed through the third induced draft fan 13 is connected with the biological soil filter bed 8 through the sixth ventilation pipe 22.

The positive and negative oxygen ion air with controllable concentration produced by the high-energy ion generator 1 is sent into the sludge storage tank 2 through the first ventilation duct 17, or is sent into the closed sludge storage tank 3 through the second ventilation duct 18, and the sewage The odor molecules released in the mud storage tank 2 or the closed sludge storage 3 will eventually form carbon dioxide and water under the interaction with the ionic air, and the positive and negative oxygen ion air with controllable concentration generated by the high-energy ion generator 1 Send into the air mixing chamber 16 through the third ventilation duct 19, mix with the tail gas discharged from the sludge drying and granulation device 6 through the eighth ventilation duct 24, and the ionized air reacts with the odor molecules in the tail gas on the one hand, thereby Reduce the concentration of odor molecules, and on the other hand, charge the tiny particles in the tail gas to produce agglomeration effect, thereby reducing the concentration of dust. After the ionized air in the generator 1 interacts, it enters the water film granite dedusting and degassing device 9, and after further dedusting and deodorization through the elution of the liquid medicine, it passes through the fifth induced draft fan 25 and is sent to the chimney 10 for discharge that is completely up to standard.

Sludge storage is an important part of the sludge drying project, and it is also an important stage for the generation and release of sludge odor. In the sludge drying project, sludge storage tanks or closed sewage tanks are usually used for sludge storage. The sludge storage tank, the sludge storage tank 2 or the closed sludge storage tank 3 constitutes the sludge storage system 30 in the sludge drying project, and the first ultraviolet lamp 26 is respectively installed in the sludge storage tank 2, A second ultraviolet lamp 27 is installed in the closed sludge storage warehouse 3, and the ultraviolet lamp plays a role in sterilization to prevent the sludge from continuing to generate odor due to the activities of microorganisms during the storage process. The sludge storage system 30 is connected with the biological soil filter bed 8 connected, the second induced draft fan 12 sends the gas discharged from the sludge storage tank 2 or the closed sludge storage 3 through the fifth ventilation pipe 21 into the biological soil filter bed 8, and the residual odor in the discharged gas is produced by microorganisms. Eliminate, if the high-energy ion generator 1 temporarily stops working due to failure, the biological soil filter bed 8 can purify all odors in the sludge storage system 30 discharge gas. The energy for sludge drying can come from an independent heat source, or waste heat from the flue gas can be used. The heat generated by the independent heat source 4 passes through the temperature regulator 15 and enters the sludge drying and granulation device 6 to dry the sludge. The waste heat of the flue gas 5 directly Enter the sludge drying and granulating device 6 to dry the sludge. When the energy for sludge drying comes from an independent heat source, the sludge storage system 30 can be connected with the independent heat source 4, and the first induced draft fan 11 will store the sludge from the sludge. The gas discharged from the tank 2 or the closed sludge storage 3 is sent to the independent heat source 4 through the fourth ventilation duct 20, and the residual odor in the discharged gas is eliminated by high temperature. If the high-energy ion generator 1 temporarily stops working due to failure, the independent The heat source 4 can eliminate all odors in the exhaust gas from the sludge storage system 30 .

The second closed conveyor belt 29 sends the sludge from the sludge storage system 30 with the sludge storage tank 2 or the closed sludge storage 3 into the sludge drying and granulating device 6, and utilizes the independent heat source 4 or smoke Gas waste heat 5 dries the sludge, and there is a sludge drying workshop 31 with sludge drying and granulation device 6, the first closed conveyor belt 28, and the second closed conveyor belt 29. Odor that may exist in the air , sent into the biological soil filter bed 8 by the fourth induced draft fan 14 through the seventh ventilation duct 23, and eliminated by microorganisms. The dried sludge particles passing through the sludge drying and granulating device 6 are sent to the dried sludge product warehouse 7 by the first closed conveyor belt 28, and a small amount of residual odor released by the dried sludge particles during the cooling process, It is sent into the biological soil filter bed 8 by the third induced draft fan 13 through the sixth ventilation pipe 22, and is eliminated by microorganisms.

Claims (2)

1. the stench control system of a sludge drying engineering, it is characterized in that having energetic ion producer 1, energetic ion producer 1 is connected with mud hold-up vessel 2 by first ventilator trunk 17, perhaps be connected with closed mud storage vault 3 by second ventilator trunk 18, energetic ion producer 1 is connected with mixing chamber 16 by the 3rd vent-pipe road 19, mixing chamber 16 is connected with granulating apparatus 6 with sludge drying by the 8th ventilator trunk 24, mixing chamber 16 and moisture film fiber crops stone dedusting degasifying device 9, the 5th induced draft fan 25, chimney 10 is connected, mud hold-up vessel 2 or closed mud storage vault 3 constitute mud stocking system 30, mud stocking system 30 is connected with biological soil filter bed 8 by five-way airduct road 21 through second induced draft fan 12, perhaps mud stocking system 30 is connected with independent thermal source 4 by four-way airduct road 20 through first induced draft fan 11, independent thermal source 4 is connected with granulating apparatus 6 with sludge drying by thermoswitch 15, fume afterheat 5 is connected with granulating apparatus 6 with sludge drying, sludge drying and granulating apparatus 6, the first closed conveying belt 28, the second closed conveying belt 29 constitutes sludge drying workshop 31, sludge drying workshop 31 is connected with mud stocking system 30 through the second closed conveying belt 29, sludge drying workshop 31 is connected with biological soil filter bed 8 by the 7th ventilator trunk 23 through the 4th induced draft fan 14, sludge drying is connected with dewatered sludge stockyard 7 through the first closed conveying belt 28 with granulating apparatus 6, and dewatered sludge stockyard 7 is connected with biological soil filter bed 8 by the 6th ventilator trunk 22 through the 3rd induced draft fan 13.

2. mud hold-up vessel 2 according to claim 1 or closed mud storage vault 3 is characterized in that, are provided with first ultraviolet lamp 26 in the mud hold-up vessel 2, are provided with second ultraviolet lamp 27 in the closed mud storage vault 3.

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