CN114560611A

CN114560611A - Sludge treatment method

Info

Publication number: CN114560611A
Application number: CN202210168173.9A
Authority: CN
Inventors: 王志祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-05-31

Abstract

The application relates to the technical field of sludge treatment, in particular to a sludge treatment method, which comprises the following steps: preliminary drying, namely standing the sludge in a drying tank until the sludge is solid, wherein the wall of the drying tank has water permeability and can enable water in the sludge to seep out; deep drying, namely making the primarily dried sludge into blocks, and standing and air-drying the blocks; by adopting the sludge disposal method, the water content of the sludge can be directly reduced to 0%, the disposal cost is greatly reduced, the sludge can be incinerated automatically, the secondary pollution in the disposal process is greatly reduced, and the storage, transportation, utilization and incineration of the sludge become more flexible.

Description

Sludge treatment method

Technical Field

The application relates to the technical field of sludge treatment, in particular to a sludge treatment method.

Background

The main principle and method for treating sewage in a current sewage treatment plant are an activated sludge method and a biofilm method, excess sludge is generated when sewage is treated by the activated sludge method and the biofilm method, and the traditional treatment process of the excess sludge comprises sludge concentration, sludge dehydration, dry sludge storage, sludge transportation, sludge utilization or incineration. The sludge dewatering mainly adopts the belt filter press dewatering or the plate and frame filter press dewatering.

However, in the prior art, the water content of the sludge after the sludge dehydration is still high, the belt filter press is about 80%, and the plate-and-frame filter press is about 60%, so that a series of subsequent treatment procedures are generated, and problems of excessive treatment cost, complicated treatment process, secondary pollution and the like are caused.

Disclosure of Invention

In order to overcome the problems in the related art at least to a certain extent, the present application aims to provide a sludge treatment method, which has low water content after sludge treatment and can avoid the problems of excessive treatment cost, complex treatment process and secondary pollution. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the application are described in detail in the following.

The application provides a sludge treatment method, which comprises the following steps:

preliminary drying, namely standing the sludge in a drying tank until the sludge is solid, wherein the wall of the drying tank has water permeability and can enable water in the sludge to seep out;

deep drying, namely making the primarily dried sludge into blocks, and standing and air-drying the blocks;

preferably, the drying tank comprises:

the first tank body is made of a water-permeable material and is used for containing sludge;

the second tank body is made of water-resisting materials and is provided with a water outlet;

wherein the first tank body is positioned in the second tank body.

Preferably, the drying tank is provided with a plurality of layers along the vertical direction, and the drying tank is provided with an auxiliary facility for assisting an operator to discharge sludge.

Preferably, the time for preliminary drying is adjusted according to a first factor, wherein the first factor comprises:

the hydrophilic property of the sludge;

the water permeability of the drying tank;

the local climate environment comprises air temperature, air humidity, ventilation condition and day and night temperature difference.

Preferably, the water content of the sludge after the primary drying is determined according to the source components of the sludge and the content of the flocculating agent, wherein the source components of the sludge comprise pretreated sludge, biochemical sludge, sludge generated by pure domestic sewage and sludge generated by industrial sewage treatment.

Preferably, the deep drying comprises:

inputting the sludge after primary drying into a feed inlet of a brick making machine;

conveying the sludge extruded into blocks by the brick making machine to an air drying field;

and stacking the blocky sludge in the air drying field at intervals and in a hollow manner.

Preferably, the time for deep drying is adjusted according to a second factor, wherein the second factor comprises:

selecting the positions of the air drying field, including local air temperature, air humidity, ventilation conditions and day and night temperature difference;

construction style of air drying plant;

the shape and size of the blocky sludge;

stacking the blocky sludge;

the size of the interval of the blocky sludge.

Preferably, the method further comprises the following steps:

piling the deeply dried massive sludge to the furnace top along the furnace bottom of the incinerator;

igniting the lumpy sludge at the bottom of the incinerator;

the residue generated by burning the blocky sludge is reused or buried.

Preferably, the recycling of the residue comprises:

fertilizing the soil according to the inorganic phosphorus in the residues;

cement is produced from the silica in the residue.

Preferably, when the sludge is sludge generated by pure domestic sewage, the sludge after deep drying is used as root soil of plants.

The technical scheme provided by the application can comprise the following beneficial effects:

discharging sludge with a certain water content into a drying tank, and permeating water in the sludge by utilizing the water permeability of the tank bottom and the tank wall of the drying tank to reduce the water content of the sludge in the drying tank; meanwhile, the sludge can be stored and placed for a long time, and the moisture in the sludge can be continuously evaporated to achieve the drying purpose after the sludge undergoes natural phenomena such as wind blowing, sun exposure, day and night temperature difference variation, four-season temperature difference variation and the like. When the physical characteristics of the sludge show that the solid property meets the requirement of deep drying, the sludge in the drying tank is conveyed to the ground through a sludge safety channel, the sludge is made into blocks in a mechanical mode, and the blocks of sludge are stood and air-dried in a rain-sheltering and ventilating environment until the water content of the sludge is close to 0 percent. By adopting the sludge disposal method, the water content of the sludge can be directly reduced to 0%, the disposal cost is greatly reduced, the sludge can be incinerated automatically, the secondary pollution in the disposal process is greatly reduced, and the storage, transportation, utilization and incineration of the sludge become more flexible.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow diagram of the present sludge treatment method, shown in accordance with some exemplary embodiments;

fig. 2 is a block diagram of a drying basin according to some exemplary embodiments.

In the figure: 1. a first tank body; 2. a second tank body; 3. and a water outlet.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus or methods consistent with aspects of the present application.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.

Referring to fig. 1-2, the present embodiment provides a sludge disposal method, including primary drying and deep drying.

The primary drying comprises the following steps: standing the sludge in a drying tank until the sludge is in a solid property, wherein the wall of the drying tank has water permeability so as to enable water in the sludge to seep out.

The specific working process is that sludge with certain water content is discharged into a drying tank, and water in the sludge is permeated by utilizing the water permeability of the tank bottom and the tank wall of the drying tank, so that the water content of the sludge in the drying tank is reduced; meanwhile, the sludge can be stored and placed for a long time, and the moisture in the sludge can be continuously evaporated after the sludge is subjected to natural phenomena such as wind blowing, sun drying, temperature difference variation in the day and night, temperature difference variation in four seasons and the like, so that the drying purpose is achieved. For example, when sludge with a water content of 90% is discharged into a drying tank, the water content of the sludge can be rapidly permeated through the tank wall and the tank bottom of the drying tank, the water content of the sludge can be reduced to 80% in 2-3 days, to 70% in about 15 days, and to 60% in about 2 months, after that, because the water content outside the sludge is basically discharged almost, the reduction of the water content of the sludge by means of the evaporation of the water can be very slow, and therefore, the further deep drying needs to be performed to further rapidly reduce the water content of the sludge. At this stage, the reduction of the water content of the sludge is mainly completed by percolation, and the water evaporation plays a small role, such as a primary drying period of drying to 60% according to two months and more than one cycle in three months.

Here, the primary drying is intended to reduce the water content of the sludge and to change the physical properties of the sludge by reducing the water content of the sludge, in preparation for the deep drying of the subsequent sludge. The sludge discharged into the drying tank is fluid due to high water content, and gradually shows solid property after the water content is reduced to 60%.

The deep drying comprises the following steps: making the primarily dried sludge into blocks, and standing and air-drying the blocks.

Specifically, when the physical characteristics of the sludge show that the solid property meets the requirement of deep drying, the sludge in the drying tank is conveyed to the ground through a sludge safety channel, the sludge is made into blocks in a mechanical mode, and the blocks are stood and dried in a rain-sheltering and ventilating environment until the water content of the sludge is close to 0%. The process is equivalent to the process of making green bricks and air-drying in a brickyard, and the sludge can be directly made into the shape of the green bricks by the existing green brick making equipment and dried in the shade by using the way of drying the green bricks. The complete drying time of the green brick in the traditional brick making process is 1-2 months.

Original sludge dewatering mode is mechanical dewatering, through the extruded mode of additional pressure, considerable moisture in the mud is in the same place with the material in the mud completely, so it is limited to reach the mud moisture content of how low, and this sludge treatment method mainly adopts infiltration and air-dry mode, inside at infiltration and air-dried in-process mud, can slowly run off with the moisture that the mud combines together, slowly change the structure of the inside material of mud, and the massive root purpose is exactly in order to increase the area of mud evaporation moisture with mud is made into to degree of depth mummification, reduce the time of air-drying mud. For example, a grape cannot be completely squeezed even if squeezed and rotten, but the grape can be changed into raisin after a while by adopting a method of airing and drying in the shade.

The most fundamental reason is that a large amount of water is still contained in the sludge after the sludge is dehydrated in the original sludge dehydration mode, and a large amount of heat (generally, coal is burned) needs to be added in the incineration process to completely evaporate the water in the sludge and then burn the sludge, which is also the fundamental reason of high sludge combustion cost. The sludge disposal method can almost completely remove the water in the sludge, and the sludge contains a large amount of organic matters, so that the sludge can be incinerated; and the sludge self-incineration can avoid burning a large amount of coal and avoid discharging a large amount of carbon dioxide.

In the original sludge dewatering process, a flocculating agent needs to be added into the sludge, and the added flocculating agent can pollute the sludge and filter water. Dehydrated sludge needs to be packaged and stored in a warehouse by ton bags, and a large amount of moisture exists in a relatively closed space, so that the sludge can generate anaerobic reaction, a large amount of toxic and harmful gases such as hydrogen sulfide (virulent), methane (greenhouse gas) and unpleasant odor are generated, the sludge can be continuously emitted from the sludge in the transportation process and the storage process of burning points, and the sludge is particularly greatly injured to sludge operators. The sludge treatment method is much better, flocculating agents do not need to be added in the whole process, the only process which can generate anaerobic gas is the later stage of the primary drying stage, but an air vent with the length of about 1 meter is reserved at the upper opening of the drying tank, and the generated amount is much less even if the anaerobic gas can be generated.

After sludge is dewatered by the original method, the sludge is stored in a warehouse, and because poisonous and harmful gases can be continuously generated, the sludge in the warehouse must be completely cleaned at intervals so as to prevent the poisonous and harmful gases from accumulating to a certain degree and causing safety accidents. By adopting the sludge treatment method, after the sludge is deeply dried, the properties of the sludge are very stable, the sludge does not need to be packaged, and the sludge can be stored for a long time as long as the sludge is not affected with damp, can be transported and utilized as required, and can be incinerated at a proper time. For example, raisins can be stored for a long time, while grapes cannot.

By adopting the sludge disposal method, the water content of the sludge can be directly reduced to 0%, the disposal cost is greatly reduced, the sludge can be incinerated automatically, the secondary pollution in the disposal process is greatly reduced, and the storage, transportation, utilization and incineration of the sludge become more flexible.

In some preferred embodiments, the drying tank comprises:

the first tank body 1 is made of a water-permeable material and is used for containing sludge;

the second tank body 2 is made of water-proof materials and is provided with a water outlet 3;

wherein, the first tank body 1 is positioned in the second tank body 2.

Specifically, the drying tank is arranged to be a double-layer tank body structure, wherein the first tank body 1 is made of a water-permeable material, such as common bricks, a filter cloth type material and permeable concrete, and can filter fluid media, the water-permeable drying tank is used for permeating water in sludge through the tank wall and the tank bottom and blocking the sludge in the tank, but the requirements of the tank bottom and the tank wall are different, the strength required by the tank wall is not too high, the water permeability is high, the sludge can be blocked in the tank, and the tank bottom can walk on the tank and clear the dry sludge in the process of clearing the sludge, even small-sized equipment auxiliary facilities are provided, so that the water permeability is not required to be high, but the strength must meet the relevant requirements.

The second tank body 2 is made of a water-proof reinforced concrete structure or other water-proof materials, wherein the second tank body 2 is formed by pouring reinforced concrete, forms a framework of the drying tank, plays a role in supporting the whole drying tank and simultaneously plays a role in preventing sewage from overflowing.

In the implementation process, attention is paid to the fact that water cannot be accumulated in the channel between the inner pool wall and the outer pool wall, water needs to be discharged in time, and otherwise the operation effect is adversely affected.

Moreover, the drying tank is provided with auxiliary facilities for assisting operators in discharging the sludge.

Meanwhile, the drying tank can be made into a multi-layer tank like a commodity room, namely, the drying tank is provided with multiple layers along the vertical direction, the processing capacity can be doubled, so that after the drying tank is made into multiple layers, the sludge cleaning work needs auxiliary facilities, the auxiliary facilities are used for facilitating the personnel, tools and the like for cleaning the sludge to freely move up and down, the dry sludge can be safely conveyed to the ground, and the auxiliary facilities can be stairs, small-sized engineering elevators, dry sludge safety channels and the like.

In the concrete implementation process, a drying tank with the length of 40 meters and the width of 30 meters can be built, the effective self-drying area of the drying tank is estimated to be 1000-level, other 200-level stairs, engineering elevators, dry sludge channels and other areas are calculated, 10 floors of the whole building are built, the effective height of each floor is 2 meters, a space with the height of 1 meter is reserved for ventilation, and then the whole building can contain 20000 cubic sludge at one time.

The preliminary drying time is adjusted according to the first factor, and the effective standing time of the preliminary drying can be reduced to the greatest extent due to the poor standing water seepage effect at the later stage.

Wherein the first factor comprises:

the hydrophilic property of the sludge;

water permeability of the drying tank;

In the primary drying process of the sludge, the drying speed of the sludge is influenced by the following factors. 1. The properties of the sludge are mainly hydrophilicity 2, the properties of the internal tank body are mainly drainability, and 3, the local climate environment, climate change and other factors. The higher the pore space of the inner tank wall is in the drying process, the higher the outside air temperature is, the better the ventilation condition is, the larger the temperature difference change in the day and night is, the easier the moisture in the sludge is separated from the sludge, and the faster the drying speed of the sludge is.

In some embodiments, deep drying comprises:

and stacking the blocky sludge in an air drying field at intervals and in a hollow manner.

Specifically, the brick making machine for making the sludge into blocks can directly use the existing equipment for making green bricks, is mature, reliable, simple and easy to obtain, and has low price, for example, an RTS6 type automatic brick-building production line produced by Beijing rui map is directly adopted to produce 240 × 115 × 53 standard bricks, the sludge which is preliminarily dried is put into a feed inlet of the equipment, and the sludge is extruded into the blocks and then is conveyed to an air drying field. After the sludge is conveyed to an air drying field, the blocky sludge needs to be neatly hollowed and stacked, namely, a certain gap is reserved between the stacked sludge blocks so as to ensure that the water evaporated from the sludge blocks can be easily carried away by wind. The sludge air drying field can keep good natural ventilation, cannot be drenched by rain, preferably has good illumination, and most influencing the sludge drying speed is the temperature of the whole external environment.

According to the content of the source components and the flocculating agent of the sludge, the water content of the sludge after the primary drying is determined, different sludge is solid after the primary drying, and for better meeting the requirement of deep drying, the water content of the sludge after the primary drying is determined according to different sludge, so that the effect and the quality of the deep drying are ensured.

Wherein the source components of the sludge comprise pretreated sludge, biochemical sludge, sludge generated by pure domestic sewage and sludge generated by industrial sewage treatment.

It should be noted that the sludge which is primarily dried should have a certain moisture content so that the sludge has a certain viscosity, when the sludge can be extruded and molded in the manufacturing process of the sludge block and conveyed to an air drying field after being molded and stacked, the sludge is not easy to deform and loosen, basically, the moisture content of the sludge of about 60 percent can meet the requirement of making the sludge into blocks, but the source components of various kinds of sludge are not consistent in practical application (pretreated sludge, biochemical sludge, sludge produced by pure domestic sewage, sludge treated by industrial sewage and the like), and the specific optimal moisture content is changed according to the source components of different kinds of sludge. For example, a polymeric flocculant and an inorganic flocculant are added in the sewage treatment process, the viscosity of the sludge is higher, and the water content can be relatively higher.

The deep drying time is adjusted according to the second factor, and can be calculated according to the actual situation, so that the optimal deep drying time is ensured, and the efficiency is ensured.

Here, the second factor includes:

selecting the position of an air drying field, including local air temperature, air humidity, ventilation conditions and day and night temperature difference;

construction style of air drying plant;

the shape and size of the blocky sludge;

stacking the blocky sludge;

the size of the interval of the blocky sludge.

Specifically, the second factor affecting the sludge deep drying time is generally a factor that can be controlled. For example, the shape and size of the sludge to be made into blocks, the selection of the position of an air drying site, the construction style of the sludge air drying site, the way of stacking sludge blocks, the size of the gaps among the sludge blocks and the like are selected as much as possible, the direction which is beneficial to the rapid drying of the sludge is selected, and the economical efficiency and the feasibility of the actual use need to be considered. Under normal temperature and normal climate conditions in the second spring and autumn of Jiangsu, sludge is almost completely air-dried within 1 and a half month, the temperature is normally more than two months in winter, and the temperature is normally about 35 days in summer for about 20 days (refer to the actual condition that brick blanks are dried in the shade at 240X 115X 53 in local).

Meanwhile, the sludge drying system is also influenced by some uncontrollable factors, such as regional difference, influence of extreme weather, wind power of the position of the sludge drying field, wind duration time, frequency and air drying degree. The drying speed of the sludge at the stage mainly depends on evaporating water, and is greatly influenced by temperature. The influence of the region, the highest temperature of Turpan in Xinjiang is more than 70 ℃, the lowest temperature is more than minus 20 ℃, the temperature difference between day and night is extremely large, air is dried, in the environment, the drying speed of the sludge is very high and is far higher than that of Jiangsu regions, the temperature is normally lower than zero and is maintained for a long time, the sludge blocks contain certain moisture, and the sludge blocks can be loosened. Under the influence of extreme weather, Jiangsu has a moldy and rainy season every year, normally rains in more than 20 days continuously in cloudy days, and air is humid, so that the water content of sludge blocks is probably not reduced and reversely increased in the period. Similarly, in areas with high wind power, long duration time, high frequency and relatively dry air, the sludge drying speed is higher than that in areas without wind all the year round and with relatively humid air under other similar conditions. Some unfavorable natural conditions can be avoided by adopting some artificial measures, such as that the air temperature temporarily drops below zero or rains in a cloudy day for a long time, cold air can be temporarily isolated, and the original ventilation state can be restored after the air temperature rises or rains in a sunny day.

In some embodiments, the present sludge treatment method further comprises:

igniting the lumpy sludge at the bottom of the incinerator;

the residue generated by burning the blocky sludge is reused or buried.

Here, the final disposal of the sludge is carried out in two ways, namely, sludge utilization and sludge incineration, and the sludge incineration is changed from the original coal incineration to sludge self-incineration. The sludge self-incineration is a process of utilizing a large amount of organic matters contained in sludge blocks to carry out self-combustion. Because the content of organic matters in the sludge is generally over 50 percent and is higher than that of organic matters in the peat, the spontaneous combustion process is similar to the traditional process of firing green bricks into bricks or the process of firing briquettes in a briquette furnace.

The self-incineration of the sludge needs to use an incinerator, the incinerator is equivalent to an enlarged coal ball furnace or a brick kiln for brick firing, the most main part is a furnace bottom and a furnace body with a heat insulation function, deeply dried sludge blocks are orderly stacked on the furnace bottom, stacked up layer by layer and stacked to the furnace top, firewood or other combustible substances are combusted below the furnace bottom, the sludge blocks at the bottom layer are ignited, the firewood does not need to be combusted after the firewood is ignited, and the self-incineration is equivalent to an ignition function. The heat generated in the combustion process of the sludge block at the bottommost layer upwards ignites the sludge block at the upper part, and the furnace body with the heat insulation function isolates the heat generated by combustion in the furnace body until the complete combustion of the sludge block in the furnace is finished. Certainly, the residual slag generated by combustion can be continuously cleaned out in time, and simultaneously, the sludge block is continuously added into the upper part of the furnace body, so that a continuous sludge self-incinerating process is formed. The organic matters in the self-incinerated sludge block are completely combusted at high temperature, the residual slag after combustion is all inorganic matters, no harm is caused to human or natural animals and plants, and on the contrary, some inorganic matters contained in the inorganic matters can promote the growth of plants, so that the sludge block can be properly utilized and directly buried.

According to whether the components of the sludge cause harm to daily production and life of people, the sludge is divided into general solid waste and dangerous solid waste (the specific definition requires the identification of a national authority), and the final treatment of the general solid waste is generally farmland utilization, forest soil fertility utilization, building material utilization and the like. The dangerous solid wastes must be sent to the units with relevant treatment qualification for incineration disposal. The final disposal of the general solid waste is generally sludge utilization, and the final disposal of the dangerous solid waste is generally sludge incineration. The final treatment of the sludge in the sludge treatment method adopts self-incineration, so that compared with the original sludge incineration, a large amount of treatment cost can be saved. For example, domestic sewage and industrial wastewater are mixed and then treated, and the sludge is identified as dangerous waste sludge because of the contamination of the industrial sewage, the final treatment method required by the state of the dangerous waste sludge is incineration, about 6000 tons of sludge are generated every year and are sent to relevant qualification units to be incinerated for about 6000 yuan, the incineration expense for one year is about 3600 ten thousand, and the cost of sludge dehydration and sludge transportation is added, so that the disposal cost of the optical sludge for one year is more than 5000 ten thousand. And by adopting sludge self-incineration treatment and building a set of self-incineration device, 3600 ten thousands of sludge incineration expenses are saved, and in addition, long-distance transportation expenses are saved.

Wherein, the recycling of the residue comprises:

fertilizing the soil according to the inorganic phosphorus in the residues;

cement is produced from the silica in the residue.

Specifically, the residual sludge is rich in a large amount of inorganic phosphorus, and the phosphorus in the soil is depleted due to the fact that a vegetable planting base plants a specific vegetable for a long time, so that the residual sludge can be used for directly fertilizing the soil, and the utilization of farmlands and forests are the same in principle. For example, the residual slag contains a large amount of silica, and the residual slag can be directly utilized when being required in the cement production process of a cement plant, so that certain economic benefit can be generated. Of course, if the sludge can not directly generate obvious utilization with certain economic value, the sludge can also be directly buried, and as long as the sludge residue does not contain heavy metals, the sludge can not generate any harm to people, animals and plants.

When the sludge is sludge generated by pure domestic sewage, the sludge after deep drying is used as root soil of plants.

The national authority identifies and defines components in the sludge which can cause harm to life and production of people, or the sludge has the components with small quantity or degree which is not enough to cause harm to life and production of people, and the sludge is not required to be incinerated for final recycling after the pure domestic sewage is treated and dried. The main component of the part of sludge is organic matter, and the specific point is that the organic matter in the water is taken as food by microorganism and self-breeds in the sewage treatment process, and the sludge after drying is equivalent to a corpse aggregate of the microorganism. The sludge is characterized by a large amount of harmless organic matters and inorganic matters, the recycling of the sludge is divided into two modes, one mode is land utilization, such as the utilization of vegetable bases, forests and farmlands, and the sludge can also provide a large amount of organic fertilizers for plants because the sludge is rich in a large amount of organic matters. Another mode is eucalyptus planting, the eucalyptus is the fastest growing tree species in the world, the method has the advantages of being fast in growth, short in rotation cutting period, good in economic benefit and the like, but also has the advantage of large fertility consumption on soil, dried sludge is used as root soil of the eucalyptus, a complementary virtuous cycle can be formed, organic nutrient substances are continuously supplemented for the eucalyptus, good economic benefit can be generated after the eucalyptus grows into a material, and meanwhile the problem of harmless disposal of the sludge is solved. The final sludge disposal may therefore present a cycle: sewage produced by people in life → sludge separated from water → sludge which is used for land utilization and production utilization after being treated → produced materials needed by people such as grains, vegetables, wood and paper → sewage produced by people in life.

It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like as used herein, are intended to indicate an orientation or positional relationship relative to that shown in the drawings, but are merely used to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description herein, it is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The multiple schemes provided by the application comprise basic schemes of the schemes, are independent of each other and are not restricted to each other, but can be combined with each other under the condition of no conflict, so that multiple effects are achieved together.

While embodiments of the present application have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present application, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. A sludge treatment method is characterized by comprising the following steps:

deep drying, namely making the primarily dried sludge into blocks, and standing and air-drying the blocks.

2. The sludge disposal method of claim 1, wherein the drying tank comprises:

the first tank body (1) is made of a water-permeable material and is used for containing sludge;

the second tank body (2) is made of water-proof materials and is provided with a water outlet (3);

wherein the first tank body (1) is positioned in the second tank body (2).

3. The sludge treatment method according to claim 2, wherein the drying tank is provided with a plurality of layers in the vertical direction, and the drying tank is provided with auxiliary facilities for assisting operators in discharging the sludge.

4. The method of sludge disposal according to claim 1 wherein the time for initial drying is adjusted according to a first factor, wherein said first factor comprises:

the hydrophilic property of the sludge;

the water permeability of the drying pool;

5. The sludge treatment method according to claim 1, wherein the water content of the sludge after the primary drying is determined according to the source components of the sludge and the content of the flocculant, wherein the source components of the sludge include pretreated sludge, biochemical sludge, sludge produced from pure domestic sewage and sludge from industrial sewage treatment.

6. The method of sludge disposal according to claim 1 wherein said deep drying comprises:

7. The sludge treatment method according to claim 6, wherein the time for deep drying is adjusted according to a second factor, wherein the second factor comprises:

construction style of air drying plant;

the shape and size of the blocky sludge;

stacking the blocky sludge;

the size of the interval of the blocky sludge.

8. The sludge disposal method according to claim 1, further comprising:

igniting the lumpy sludge at the bottom of the incinerator;

the residue generated by burning the blocky sludge is reused or buried.

9. The sludge disposal method of claim 8, wherein said recycling of said sludge comprises:

fertilizing the soil according to the inorganic phosphorus in the residue;

cement is produced from the silica in the residue.

10. The method according to claim 1, wherein when the sludge is sludge produced from pure domestic sewage, the deeply dried sludge is used as root soil of plants.