WO2018155943A1 - Dehydration process for controlling moisture content of bio-sulfur suspension - Google Patents

Abstract

The present invention relates to a dehydration process for controlling the moisture content of bio-sulfur to an average range of 45-55% by controlling the vehicle speed value of a dehydrator and the Imhoff value of a bio-sulfur-containing solution that is introduced into the dehydration process in order to dry the bio-sulfur. The present invention has an effect whereby operation costs for the entire process may be reduced and a desulfurization facility may be operated in a stable manner by controlling the moisture content of the final produced bio-sulfur by controlling the main factors of the dehydration process.

Description

Dehydration Process for Controlling Biosulfur Suspension Water Content

The present invention relates to a dehydration drying process for controlling the biosulfur moisture content, which is the final stage of the biosulfur production process.

That is, the present invention aims to appropriately control the water content of the bio-sulfur produced by adjusting the main factors of the dehydration process for commercial production of the bio-sulfur produced through the settler and the dehydrator in the bio-sulfur production process.

In order to produce bio-sulfur, hydrogen sulfide contained in methane gas from landfills needs to be converted to elemental sulfur (S), which requires large-scale facilities due to the high sulfur load (S-load) process. The biosulfur production also increased. As a result, it is difficult to operate a power generation facility based on landfill gas without treating the generated biosulfur, and in order to dispose of biosulfur as waste, a large amount of operating costs are added, which is a big problem.

Therefore, in order to efficiently process, purify, and sell biosulfur in order to efficiently operate a power generation facility using landfill gas as a raw material, a product having a constant moisture content must be produced. Therefore, the present invention relates to a technology that can adjust the water content of the biosulfur product to a certain range by adjusting the main factors of the dehydration process.

That is, the present invention is an essential process technology for converting sulfur compounds contained in biogas and landfill gas into elemental sulfur using a biological process, and commercially selling the generated sulfur.

Sulfur has traditionally been a toxic substance from various waste treatment processes, but biosulfur, unlike conventional industrial sulfur, has high solubility in water, harmless to humans, and no damage to crops. Most likely. In addition, there is no toxicity, and there are various applications such as cosmetics, medicines, fungicides and fertilizers. Biosulfur is also advantageous because it is close to neutral ingredients and does not require additional processing such as adding chemicals to be used as fertilizers and pesticides.

According to the United Nations Food and Agriculture Organization (FAO), the global fertilizer market is expected to grow by about 290 trillion won and the pesticide market by 77 trillion won by 2018.

Bio-sulfur is produced during the removal of sulfur oxide (SOx), one of the causes of fine dust, and because it is small in particle size and can be produced in liquid phase, it can not only replace the existing chemical fertilizer but also can be used as a pesticide raw material. This is considered very high.

In order to utilize such biosulfur for commercial use, it is very important to optimize the dehydration drying process to control the moisture content of sulfur in the final purification step.

However, the conventional Thiopaq process disposes biosulfur generated due to low sulfur load (S-load) as waste, and thus it is not necessary to maintain a constant moisture content of biosulfur generated. The process for this was not well established.

On the other hand, the main process control factors of the dehydration process

) Total Suspended Solids (TSS) in the settler: the total solids in the process water,

Imhoff in a settler: volume of solids that settle in a volume (1000 ml) of process water over a period of time (1 hour)-closely related to S-load and microbial activity

) Dehydrator supply flow rate (adjust with pump),

) Main motor rpm (ball rpm): It is the rotational speed of the external ball of the dehydrator.When operating at the maximum speed, the separability of the solids increases, so that the water content decreases.

) Vehicle speed value: Expressed as (main motor speed, vehicle speed motor speed) / (deceleration ratio), the vehicle speed motor rotates slightly slower than the main motor and the direction of rotation is reversed.

The moisture content of the biosulfur can be controlled by adjusting the main process control factors listed above. Among them, the moisture content of the biosulfur can be optimally adjusted by adjusting the Imhoff value and the vehicle speed value.

On the other hand, the TSS and Imhoff values of the settling tank can be adjusted through the optimization of the overall process, but can be controlled primarily through the feed pump. The settling tank is a settling tank, not a special machine, and the TSS and Imhoff values can be adjusted by adjusting the residence time (sedimentation time).

The dehydrator used in the biosulfur dehydration step is a centrifugal dehydrator, as shown schematically in FIGS. 1 and 2.

The rotor (ball) of the dehydrator rotates at a constant speed (approximately 3,100 rpm), and the screw driven by the vehicle speed motor rotates at a slightly lower speed than the rotor, and the direction of rotation is reversed. Separation, and the solid material attached to the outer wall of the ball 13 through the screw 15 is transferred to the solids discharge portion 16 is a system for discharging. At this time, the value obtained by dividing the speed difference between the main motor 1 and the vehicle speed motor 2 by the reduction ratio is defined as the vehicle speed value.

The problem to be solved by the present invention is to provide a dehydration process for constantly adjusting the biosulfur moisture content in the drying process of biosulfur.

 In addition, another problem to be solved by the present invention is that the Imhoff value may change according to the change in the flow rate flowing into the process, the process of maintaining the bio-sulfur moisture content by adjusting the dehydrator vehicle speed value according to the change of the Imhoff value To provide.

 In another aspect, the present invention is to provide a method for producing a bio-sulfur generated as a by-product from landfill gas power generation facilities as a commercial product to maintain a constant water content through the development of such a bio-sulfur dehydration process.

In order to solve the problem of the present invention, it is preferable to adjust the biosulfur moisture content in the range of 45 to 55% on average by adjusting the Imhoff value of the biosulfur-containing liquid flowing into the dehydration process and the vehicle speed value of the dehydrator for drying the biosulfur. .

 When the water content is less than 45%, various problems occur. First, the device itself is caused by problems such as reduced durability of the device due to an increase in load of the dehydration system, a decrease in uptime, and a decrease in stability due to a trip caused by a sudden increase in load. Has difficulty in operation. Second, if the solid matter (sulfur) is more than 60% (the water content is less than 40%) due to the nature of bio-sulfur, it is difficult to manage because it is classified as dangerous goods. Thirdly, if the moisture content is too low, problems arise during the transfer of the produced biosulfur for the post-stage process.

In addition, when the water content exceeds 55%, the density of the sulfur suspension is reduced, the amount of bio-sulfur contained in the sulfur suspension is reduced, so the value as a commodity falls.

 In addition, it is preferable to control the biosulfur moisture content by maintaining the Imhoff value of the biosulfur-containing liquid introduced into the dehydration process and the vehicle speed value of the dehydrator for the biosulfur drying within a predetermined range as in the following equation.

Equation 1 3? Imhoff (ml / L) / vehicle speed value (rpm)? 27

If the value of Imhoff (ml / L) / vehicle speed (rpm) is less than 3 as a result of the process operation, despite the high biosulfur moisture content flowing into the dehydrator, the residence time in the dehydrator is reduced, so that the desired moisture content of the biosulfur can be obtained. It is not desirable because it cannot. On the contrary, if the Imhoff (ml / L) / vehicle value (rpm) exceeds 27, the biosulfuric material on the inner wall of the dehydrator body is maintained because the residence time in the dehydrator is kept longer than necessary even though the biosulfuric suspension is sufficiently dehydrated. This sticking occurs and there is a high possibility of clogging the dehydrator, which leads to an overload of the dehydrator device itself, resulting in equipment damage.

On the other hand, it is more preferable to control the biosulfur moisture content by maintaining the dehydrator vehicle speed value of the dehydration process in a certain range satisfying the following equation for the biosulfur drying.

Equation 2 15 ≤ vehicle speed value (rpm) ≤ 30

In general, when maintaining a proper Imhoff value, if the vehicle speed value is less than 15 rpm, the biosulfuric solids are pushed out too late in the dehydrator, causing excessive dehydration. Thus, biosulfur is produced with a very low moisture content and is undesirable because it can lead to an increase in the dehydration system load as a whole.

On the other hand, if the vehicle speed exceeds 30rpm, the desulfurization effect is reduced because the biosulfur solids are pushed out too quickly inside the dehydrator. Therefore, it is not preferable because biosulfur is produced with excessively high moisture content. In this case, the dehydrator flow rate must be reduced to increase the residence time inside the dehydrator.

In addition, it is preferable to keep the Imhoff value of the biosulfur-containing liquid flowing into the dehydration process for drying the biosulfuric acid within a predetermined range satisfying the following equation.

[Equation 3] 100 <Imhoff (ml / L) <400

If the Imhoff (ml / L) value is less than 100, it means that the concentration of the biosulfur containing suspension (actual amount containing biosulfur) is low. This may occur due to the problem of the entire process system, which is caused by the release of more biosulfur than the amount of biosulfur introduced into the process. If the value is less than 100, it is unreasonable to adjust the moisture content to the vehicle speed value in the dehydration process, and biosulfur having a relatively high moisture content or an inconsistent moisture content is produced.

On the other hand, when the Imhoff (ml / L) value is maintained at a very high concentration exceeding 400, since the biosulfur is introduced in excess of the capacity of the installed dehydrator, the residence time in the dehydrator becomes insufficient and is constant. It is difficult to produce biosulfur having a water content. Therefore, in this case, it is necessary to lower the flow rate of the process water flowing into the process itself.

In addition, it is more preferable to control the biosulfur moisture content by maintaining the Imhoff value of the biosulfur-containing liquid flowing into the dehydration process for drying the biosulfuric acid within a predetermined range satisfying the following equation.

Equation 4 150 ≤ Imhoff (ml / L) ≤ 300

Operating within this range can maintain the moisture content of bio-sulfur under more stable conditions, thereby reducing the burden on the process and stabilizing the bio-sulfur properties produced.

And, it is more preferable to maintain the water content of the bio-sulfur produced through the above process in the range of 47 to 52% on average. Maintaining the moisture content of such biosulfur not only enables stable process operation, but also stabilizes physical properties of the product to produce high quality biosulfur products.

On the other hand, when the Imhoff value decreases, it is desirable to keep the moisture content of the biosulfur constant by decreasing the dehydrator vehicle speed value, and when the Imhoff value increases, it is preferable to increase the dehydrator vehicle speed value and keep the moisture content of the biosulfur constant.

The present invention by controlling the main factor of the dehydration process by controlling the moisture content of the bio-sulfur finally produced, it is possible to reduce the operating cost of the entire process and stable operation of the desulfurization facility. In addition, if bio-sulfur is treated as waste, the processing cost of about 150,000 won / ton is incurred, but if it is produced as a commercial product through an appropriate refining process, it is possible to further profit into a high value-added industry.

Thus, through the dehydration process of the present invention it is possible to produce a bio-sulfur product having a water content of a certain range, when applied to environmentally friendly pesticides, fertilizers, etc. may have a good effect on the quality of the product.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the cross section of a dehydrator and the name of each part.

2 is a process operation data graph in which the moisture content is adjusted by changing the vehicle speed value while maintaining the dehydrator flow rate, TSS, and Imhoff constant.

3 is a process operation data graph showing that the Imhoff value decreases and the water content increases accordingly when increasing the flow rate flowing into the dehydrator while the dehydrator vehicle speed value is kept constant.

4 is a process operation data graph showing that when the precipitation tank Imhoff value is maintained within a certain range, biosulfur with a constant concentration of water is produced by adjusting the dehydrator vehicle speed value.

5 is a process operation data graph showing that even if the sedimentation tank Imhoff value changes within a certain range, the moisture content of the biosulfur can be properly maintained by adjusting the dehydrator vehicle speed value.

6 is a process operation data graph showing that when the dehydrator vehicle speed value is maintained within an appropriate range, the moisture content of the biosulfur can be maintained within a certain range by adjusting the Imhoff value by adjusting the flow rate.

7 is a process operation data graph showing that even if the sulfur load (S-load) changes within a certain range, the moisture content of the biosulfur can be properly maintained by adjusting the flow rate and the dehydrator vehicle speed value.

The dehydration drying process was designed to produce biosulfur products containing appropriate moisture after reduction of hydrogen sulfide to biosulfur, an elemental sulfur. The key device of the dehydration drying process is the dehydrator, which maintains the proper moisture content of the biosulfur by controlling the dehydration rate of the dehydrator and the flow rate supplied to the dehydrator.

 The flow rate supplied to the dehydrator can be adjusted through the inverter of the pump, the flow rate supplied to the dehydrator can be adjusted in the range of 4 ~ 20m3 / hr. The dehydrator is equipped with a main motor and a vehicle speed motor, and the speed change (vehicle speed value) of the dehydrator main motor and the vehicle speed motor can be adjusted even during operation.The main motor was operated at about 3,100 RPM by starting the inverter at maximum operation. It was adjusted to about 80-100%. And, the vehicle speed value can be adjusted in the range of 0.5 to 32, and the optimum range was set to adjust the biosulfur moisture content according to the sulfur load.

 If the flow rate and Imhoff value are constant, the moisture content can be effectively controlled by adjusting only the vehicle speed value of the dehydrator. In particular, when the dehydrator has a function to automatically change the vehicle speed value, driving control becomes very easy.

The table below shows process operation data in which the moisture content is adjusted by changing the vehicle speed value while the dehydrator flow rate, TSS and Imhoff are kept constant, and the results are shown in FIG. 2.

Table 1 is a part of the graph data of FIG. 2 as the moisture content change according to the dehydrator flow rate change when Imhoff is constant.

As shown in FIG. 2, when the dehydrator vehicle speed value was increased under constant conditions, the residence time of the process water (solids) inside the rotor was shortened, and thus the liquid-liquid separation efficiency was lowered, thereby increasing the water content.

division	Dehydrator flow rate (m 3 / hr)	Dehydrator speed (rpm)	Moisture (% M)	Imhoff (ml / L)
One	15	22	46.126	240
2	15	24	46.742	240
3	15	26	47.915	240
4	15	28	48.638	240
5	15	30	48.102	240
6	15	32	50.162	230

Table 2 is a part of the graph data of FIG. 3 as the moisture content change according to the Imhoff value change when the dehydrator vehicle speed value is constant.

On the other hand, as shown in Figure 3, it is also possible to adjust the moisture content by the change of the dehydrator main motor rpm, it was confirmed that the efficiency of separation by centrifugal force due to the density difference, not by gravity, when the dehydrator main motor rpm is adjusted under certain conditions.

That is, when the main motor rpm is reduced, the speed of the rotating body (ball) is reduced, which leads to a decrease in centrifugal force, and the water content is increased because the separation efficiency of the solid and liquid phases is lowered.

In other words, when the flow rate of the dehydrator increases, the absolute amount of the solids supplied to the dehydrator increases, thereby decreasing the solid-liquid separation efficiency and increasing the biosulfur water content. In addition, the flow rate flowing into the dehydrator and the settling time of the sedimentation tank are inversely related. For example, when the dehydrator flow rate is increased, the process time settling time of the settling tank is reduced, resulting in a decrease in the Imhoff value. Therefore, when the dehydrator flow rate was adjusted in an appropriate range to maintain a constant Imhoff, biosulfur could be produced at a constant moisture content.

That is, even if the dehydrator vehicle speed was constant, the moisture content of the biosulfur could be adjusted by adjusting the Imhoff value. The table below shows the values when the process was run under such conditions.

division	Dehydrator flow rate (m 3 / hr)	Dehydrator speed (rpm)	Moisture (% M)	Imhoff (ml / L)
One	8	24	45.924	350
2	10	24	46.022	300
3	12	24	46.048	270
4	15	24	46.742	250
5	18	24	52.142	200

Table 3 is the data of the graph shown in FIG. 4 as the settling tank Imhoff value and the dehydrator flow rate change.

And, as shown in Figure 4, if the Imhoff value of the sedimentation tank is maintained within a predetermined range before the process water is introduced into the dehydrator (150 ~ 300mL / L), by adjusting the vehicle speed value of the dehydrator to produce a bio-sulfur having a proper moisture content Confirmed that it can. The Imhoff value can vary greatly depending on the S-load and microbial conditions, but can be managed within a certain range by adjusting the flow rate. Within such managed Imhoff values, the biosulfur moisture content can be controlled by adjusting the dehydrator speed. I could adjust it.

date	Sedimentation tank Imhoff (ml / L)	Dehydrator flow rate (m 3 / hr)
09-04	290	12
09-05	320	12
09-06	330	12
09-07	295	12
09-08	260	14.5
09-09	260	15.5
09-10	260	15.5
09-11	260	17
09-12	240	17
09-13	240	17
09-14	230	17
09-15	220	16.5
09-16	200	17
09-17	230	16.5
09-18	220	16.5
09-19	300	16.5
09-20	330	16.5
09-21	240	16.5
09-22	240	16.5
09-23	240	16.5
09-24	280	16.5
09-25	240	17
09-26	240	17
09-27	260	17
09-28	260	17
09-29	300	17
09-30	300	17
10-01	290	17
10-02	300	17
10-03	280	17
10-04	310	17
10-05	300	17
10-06	320	17
10-07	300	17
10-08	300	17
10-09	320	17
10-10	300	16.1
10-11	290	17
10-12	280	17
10-13	300	17
10-14	310	17
10-15	300	16.6
10-16	300	17.2
10-17	280	17.3
10-18	320	17
10-19	330	17.1
10-20	310	16.8
10-21	300	16.5
10-22	280	16.9
10-23	290	17.1
10-24	290	17
10-25	280	17
10-26	290	17
10-27	260	17.3
10-28	270	17.1
10-29	250	16
10-30	260	16
10-31	290	16
11-01	250	16
11-02	280	16
11-03	230	16
11-04	250	14
11-05	250	14
11-06	260	14
11-07	300	14
11-08	260	14
11-09	290	14
11-10	270	15
11-11	250	15
11-12	250	15
11-13	250	15
11-14	240	15
11-15	270	15
11-16	300	15
11-17	270	15
11-18	250	15
11-19	220	15
11-20	220	15
11-21	220	15
11-22	210	15
11-23	220	15
11-24	220	15
11-25	200	14
11-26	210	14
11-27	240	14
12-04	260	9.4
12-05	290	15.2
12-06	260	15
12-07	190	17
12-08	250	14.2
12-09	230	15.8
12-10	230	15.8
12-11	210	15.7
12-12	190	15.5
12-13	200	15.7
12-14	180	15.7
12-15	190	14.5
12-16	200	14.7
12-17	210	14.5
12-18	220	14.5
12-19	250	14.7
12-20	200	14.7
12-21	240	14.8
12-22	200	14.7
12-23	240	14.9
12-24	220	14.1
12-25	200	14.5
12-26	230	14
12-27	210	14.6
12-28	180	13
12-29	210	14.5
12-30	180	13.5
12-31	190	13
01-01	200	12
01-02	210	12.5
01-03	180	13
01-04	210	12.6
01-05	220	13
01-06	210	11
01-07	200	14.8
01-08	200	14.8
01-09	190	14.5
01-10	200	14.6
01-11	200	14.7
01-12	170	14.6
01-13	140	14.8
01-14	170	14.9
01-15	170	14.9
01-16	150	14.7
01-17	150	14
01-18	170	13
01-19	190	13.2
01-20	160	13.5
01-21	200	13
01-22	160	12.5
01-23	180	13
01-24	180	13
01-25	160	12.1
01-26	170	12.8
01-27	160	13
01-28	120	13
01-29	60	13
01-30	75	12.8
01-31	90	10.2

Table 4 is graph data shown in FIG. 5 as a change in moisture content according to a change in vehicle speed value when a certain level of Imhoff value is maintained.

On the other hand, as shown in Figure 5, by adjusting the dehydrator flow rate when the process water having an appropriately maintained Imhoff value is introduced into the dehydrator can adjust the vehicle speed value to maintain a constant moisture content of the bio-sulfur in the 47 ~ 52% range Confirmed. That is, it was confirmed that biosulfuric acid having a desired moisture content can be produced by adjusting a vehicle speed value unless the condition of the incoming process water changes rapidly for a long time while the process is stabilized.

date	Moisture content (%)	Vehicle speed
09-04	44.2	11
09-05	45.8	16.5
09-06	46.2	20.7
09-07	48.5	24
09-08	49.3	30
09-09	49.5	28
09-10	49	23
09-11	49	24
09-12	49.2	28
09-13	49.5	28
09-14	49.3	28
09-15	49.5	30
09-16	49.5	28
09-17	49.6	28
09-18	49.2	29.5
09-19	49.5	29.5
09-20	49.6	29.5
09-21	49.5	29.5
09-22	49.2	30
09-23	50.1	32
09-24	50	32
09-25	50.2	32
09-26	49.9	31
09-27	50.1	31
09-28	49.9	30.5
09-29	49.8	29
09-30	49.2	26
10-01	48.4	25
10-02	48.6	24.6
10-03	48.6	25.6
10-04	49.2	23.6
10-05	48.5	22.6
10-06	48.3	25.5
10-07	48.2	25
10-08	48	24
10-09	48.1	25.5
10-10	48.9	27.4
10-11	49	28
10-12	49.9	28.5
10-13	48	25
10-14	48.1	25
10-15	48.5	25
10-16	48.2	24.5
10-17	47.9	22.5
10-18	47.8	22
10-19	48.5	21.5
10-20	48.1	21.5
10-21	47.5	19.5
10-22	47.6	19.5
10-23	47.6	19
10-24	48	19
10-25	47.9	19
10-26	48.1	19
10-27	46.1	19.5
10-28	46.2	19
10-29	47	20.4
10-30	47	18
10-31	47.1	17
11-01	47.3	18.8
11-02	47.1	18
11-03	47.2	18
11-04	47.9	20.5
11-05	47.8	27
11-06	49.1	26.5
11-07	49.5	27.5
11-08	48.8	19
11-09	48.1	19
11-10	49.3	22.5
11-11	49.5	25
11-12	49.9	26
11-13	47.1	18
11-14	48.5	24.4
11-15	48.4	24.5
11-16	48.9	25
11-17	49.7	27
11-18	50.2	27.5
11-19	49.8	23
11-20	48.8	24.5
11-21	49.1	24.5
11-22	49.6	22.5
11-23	49.5	23.5
11-24	50.2	23.8
11-25	50.4	23.5
11-26	49.8	21.5
11-27	49.5	23.5
12-04	51.3	29.5
12-05	51	24
12-06	50.5	24.5
12-07	50.1	22
12-08	51.6	27
12-09	50.8	26.5
12-10	49.8	22
12-11	49.2	22
12-12	49.9	22
12-13	49.1	20
12-14	49.9	23
12-15	50.2	23.5
12-16	49.7	22
12-17	49.6	21.5
12-18	50.1	22
12-19	48.1	13.9
12-20	48.6	12.5
12-21	48.6	13.2
12-22	48.2	12.5
12-23	47.9	13.1
12-24	49.1	13.5
12-25	48.8	13.7
12-26	48.5	12.5
12-27	48.6	16.5
12-28	48.9	16.4
12-29	49	18
12-30	49	20
12-31	49.2	20
01-01	48.7	21
01-02	49.3	23
01-03	49.1	23
01-04	48.9	21
01-05	48.5	19.3
01-06	47.1	19.5
01-07	48.6	19.5
01-08	48.3	19.5
01-09	48.5	20
01-10	49.1	20
01-11	49.5	20
01-12	49.5	20.5
01-13	49.9	21
01-14	49.5	19
01-15	49.2	18.3
01-16	49.3	17.7
01-17	49.3	17
01-18	49.6	14.7
01-19	49.4	16
01-20	48.1	15.8
01-21	48.6	15.8
01-22	48.5	15.1
01-23	48.3	15.5
01-24	48.9	16.7
01-25	48.9	16
01-26	49.6	17
01-27	49.8	16.5
01-28	49.8	19.4
01-29	50	21
01-30	51.2	20.4
01-31	51	21.5

Table 5 is graph data shown in FIG. 6 as a change in moisture content according to the Imhoff value change when a certain level of vehicle speed is maintained.

As can be seen in Figure 6, when the vehicle speed value of the dehydrator is maintained within an appropriate range to operate in a stabilized state, by adjusting the flow rate appropriately to adjust the Imhoff value of the sedimentation tank to a certain range, the moisture content of the biosulfur It was confirmed that it can be maintained.

date	Moisture content (%)	Settler Imhoff (ml / L)
09-04	44.2	290
09-05	45.8	320
09-06	46.2	330
09-07	48.5	295
09-08	49.3	260
09-09	49.5	260
09-10	49	260
09-11	49	260
09-12	49.2	240
09-13	49.5	240
09-14	49.3	230
09-15	49.5	220
09-16	49.5	200
09-17	49.6	230
09-18	49.2	220
09-19	49.5	300
09-20	49.6	330
09-21	49.5	240
09-22	49.2	240
09-23	50.1	240
09-24	50	280
09-25	50.2	240
09-26	49.9	240
09-27	50.1	260
09-28	49.9	260
09-29	49.8	300
09-30	49.2	300
10-01	48.4	290
10-02	48.6	300
10-03	48.6	280
10-04	49.2	310
10-05	48.5	300
10-06	48.3	320
10-07	48.2	300
10-08	48	300
10-09	48.1	320
10-10	48.9	300
10-11	49	290
10-12	49.9	280
10-13	48	300
10-14	48.1	310
10-15	48.5	300
10-16	48.2	300
10-17	47.9	280
10-18	47.8	320
10-19	48.5	330
10-20	48.1	310
10-21	47.5	300
10-22	47.6	280
10-23	47.6	290
10-24	48	290
10-25	47.9	280
10-26	48.1	290
10-27	46.1	260
10-28	46.2	270
10-29	47	250
10-30	47	260
10-31	47.1	290
11-01	47.3	250
11-02	47.1	280
11-03	47.2	230
11-04	47.9	250
11-05	47.8	250
11-06	49.1	260
11-07	49.5	300
11-08	48.8	260
11-09	48.1	290
11-10	49.3	270
11-11	49.5	250
11-12	49.9	250
11-13	47.1	250
11-14	48.5	240
11-15	48.4	270
11-16	48.9	300
11-17	49.7	270
11-18	50.2	250
11-19	49.8	220
11-20	48.8	220
11-21	49.1	220
11-22	49.6	210
11-23	49.5	220
11-24	50.2	220
11-25	50.4	200
11-26	49.8	210
11-27	49.5	240
12-04	51.3	260
12-05	51	290
12-06	50.5	260
12-07	50.1	190
12-08	51.6	250
12-09	50.8	230
12-10	49.8	230
12-11	49.2	210
12-12	49.9	190
12-13	49.1	200
12-14	49.9	180
12-15	50.2	190
12-16	49.7	200
12-17	49.6	210
12-18	50.1	220
12-19	48.1	250
12-20	48.6	200
12-21	48.6	240
12-22	48.2	200
12-23	47.9	240
12-24	49.1	220
12-25	48.8	200
12-26	48.5	230
12-27	48.6	210
12-28	48.9	180
12-29	49	210
12-30	49	180
12-31	49.2	190
01-01	48.7	200
01-02	49.3	210
01-03	49.1	180
01-04	48.9	210
01-05	48.5	220
01-06	47.1	210
01-07	48.6	200
01-08	48.3	200
01-09	48.5	190
01-10	49.1	200
01-11	49.5	200
01-12	49.5	170
01-13	49.9	140
01-14	49.5	170
01-15	49.2	170
01-16	49.3	150
01-17	49.3	150
01-18	49.6	170
01-19	49.4	190
01-20	48.1	160
01-21	48.6	200
01-22	48.5	160
01-23	48.3	180
01-24	48.9	180
01-25	48.9	160
01-26	49.6	170
01-27	49.8	160
01-28	49.8	120
01-29	50	60
01-30	51.2	75
01-31	51	90

Table 6 shows the data of the graph shown in FIG. 7 as the biosulfur moisture content change according to the sulfur load.

As can be seen in FIG. 7, if the vehicle speed value and the Imhoff value of the dehydrator are adjusted and maintained within an appropriate range, even if there is a change in the yellow load (S-load, Ton / day), a large change over a long period of time. It is confirmed that the water content of the biosulfur produced can be maintained at the desired target value unless the case is continuously maintained.

date	Yellow Load (Ton / d)	Moisture content (%)
09-04	18.12	44.2
09-05	17.74	45.8
09-06	17.27	46.2
09-07	17.74	48.5
09-08	14.33	49.3
09-09	17.13	49.5
09-10	18.01	49
09-11	17.35	49
09-12	18.11	49.2
09-13	18.21	49.5
09-14	17.85	49.3
09-15	18.56	49.5
09-16	18.29	49.5
09-17	17.58	49.6
09-18	19.07	49.2
09-19	18.99	49.5
09-20	19.14	49.6
09-21	18.6	49.5
09-22	17.89	49.2
09-23	18	50.1
09-24	17.8	50
09-25	17.83	50.2
09-26	17.98	49.9
09-27	18.81	50.1
09-28	18.49	49.9
09-29	18.63	49.8
09-30	18.69	49.2
10-01	19.81	48.4
10-02	18.1	48.6
10-03	18.66	48.6
10-04	18.94	49.2
10-05	19.52	48.5
10-06	19.7	48.3
10-07	17.56	48.2
10-08	19.05	48
10-09	20.53	48.1
10-10	19.56	48.9
10-11	18.9	49
10-12	19.74	49.9
10-13	19.68	48
10-14	19.27	48.1
10-15	19.87	48.5
10-16	18.7	48.2
10-17	18.69	47.9
10-18	19.52	47.8
10-19	18.65	48.5
10-20	19.25	48.1
10-21	18.93	47.5
10-22	18.9	47.6
10-23	19.12	47.6
10-24	19.08	48
10-25	19.23	47.9
10-26	19.97	48.1
10-27	17.84	46.1
10-28	17.93	46.2
10-29	20.09	47
10-30	18.57	47
10-31	18.97	47.1
11-01	19.53	47.3
11-02	19.08	47.1
11-03	18.14	47.2
11-04	17.45	47.9
11-05	17.36	47.8
11-06	15.28	49.1
11-07	17.32	49.5
11-08	17.05	48.8
11-09	16.66	48.1
11-10	17.02	49.3
11-11	18.16	49.5
11-12	14.88	49.9
11-13	16.99	47.1
11-14	16.53	48.5
11-15	19.33	48.4
11-16	17.77	48.9
11-17	17.84	49.7
11-18	16.49	50.2
11-19	17.36	49.8
11-20	18.88	48.8
11-21	17.68	49.1
11-22	19.28	49.6
11-23	19.28	49.5
11-24	17.33	50.2
11-25	18.22	50.4
11-26	17.42	49.8
11-27	15.64	49.5
12-04	18.24	51.3
12-05	17	51
12-06	17.95	50.5
12-07	17.18	50.1
12-08	13.57	51.6
12-09	16.93	50.8
12-10	17.6	49.8
12-11	17.81	49.2
12-12	16.31	49.9
12-13	16.56	49.1
12-14	17.32	49.9
12-15	18.1	50.2
12-16	17.4	49.7
12-17	17.64	49.6
12-18	16.88	50.1
12-19	16.39	48.1
12-20	17.01	48.6
12-21	16.01	48.6
12-22	15.37	48.2
12-23	17.29	47.9
12-24	17.31	49.1
12-25	16.76	48.8
12-26	15.89	48.5
12-27	17.71	48.6
12-28	17.34	48.9
12-29	17.39	49
12-30	16.86	49
12-31	16.88	49.2

On the other hand, the data that summarizes the Imhoff (ml / L) / vehicle speed value (rpm) values when the stable moisture content is maintained is shown in the table below.

Table 7 shows the change of Imhoff (ml / L) / vehicle speed (rpm) when the proper moisture content is maintained.

date	Sedimentation tank Imhoff (ml / L)	Vehicle speed	Imhoff / Vehicle Speed Value
09-04	290	11	26
09-05	320	16.5	19
09-06	330	20.7	16
09-07	295	24	12
09-08	260	30	9
09-09	260	28	9
09-10	260	23	11
09-11	260	24	11
09-12	240	28	9
09-13	240	28	9
09-14	230	28	8
09-15	220	30	7
09-16	200	28	7
09-17	230	28	8
09-18	220	29.5	7
09-19	300	29.5	10
09-20	330	29.5	11
09-21	240	29.5	8
09-22	240	30	8
09-23	240	32	8
09-24	280	32	9
09-25	240	32	8
09-26	240	31	8
09-27	260	31	8
09-28	260	30.5	9
09-29	300	29	10
09-30	300	26	12
10-01	290	25	12
10-02	300	24.6	12
10-03	280	25.6	11
10-04	310	23.6	13
10-05	300	22.6	13
10-06	320	25.5	13
10-07	300	25	12
10-08	300	24	13
10-09	320	25.5	13
10-10	300	27.4	11
10-11	290	28	10
10-12	280	28.5	10
10-13	300	25	12
10-14	310	25	12
10-15	300	25	12
10-16	300	24.5	12
10-17	280	22.5	12
10-18	320	22	15
10-19	330	21.5	15
10-20	310	21.5	14
10-21	300	19.5	15
10-22	280	19.5	14
10-23	290	19	15
10-24	290	19	15
10-25	280	19	15
10-26	290	19	15
10-27	260	19.5	13
10-28	270	19	14
10-29	250	20.4	12
10-30	260	18	14
10-31	290	17	17
11-01	250	18.8	13
11-02	280	18	16
11-03	230	18	13
11-04	250	20.5	12
11-05	250	27	9
11-06	260	26.5	10
11-07	300	27.5	11
11-08	260	19	14
11-09	290	19	15
11-10	270	22.5	12
11-11	250	25	10
11-12	250	26	10
11-13	250	18	14
11-14	240	24.4	10
11-15	270	24.5	11
11-16	300	25	12
11-17	270	27	10
11-18	250	27.5	9
11-19	220	23	10
11-20	220	24.5	9
11-21	220	24.5	9
11-22	210	22.5	9
11-23	220	23.5	9
11-24	220	23.8	9
11-25	200	23.5	9
11-26	210	21.5	10
11-27	240	23.5	10
11-29	120	31	4
11-30	98	32	3
12-04	260	29.5	9
12-05	290	24	12
12-06	260	24.5	11
12-07	190	22	9
12-08	250	27	9
12-09	230	26.5	9
12-10	230	22	10
12-11	210	22	10
12-12	190	22	9
12-13	200	20	10
12-14	180	23	8
12-15	190	23.5	8
12-16	200	22	9
12-17	210	21.5	10
12-18	220	22	10
12-19	250	13.9	18
12-20	200	12.5	16
12-21	240	13.2	18
12-22	200	12.5	16
12-23	240	13.1	18
12-24	220	13.5	16
12-25	200	13.7	15
12-26	230	12.5	18
12-27	210	16.5	13
12-28	180	16.4	11
12-29	210	18	12
12-30	180	20	9
12-31	190	20	10

As shown in Table 7 above, when the value of Imhoff (mL / L) / vehicle speed (rpm) is adjusted between 3 and 27, the biosulfur content can be maintained at around 50% to produce biosulfur having excellent physical properties. there was.

[Description of the code]

1. main motor, 2. vehicle speed motor, 3. scroll drive, 4. ball drive, 5. frame, 6. distributor, 7. (slurry) feed tube, 8. scroll bearing, 9. (slurry) feed, 10. Ball bearing, 11. throttle (damping), 12. tally filtrate outlet, 13. ball, 14. separation chamber, 15. feed screw, 15a. Immersion disc, 16. Solids outlet, 17. Gearbox, 18. Vibration seal, 19. Clutch.

Claims (6)

1. A dehydration process that controls the biosulfur moisture content by adjusting the Imhoff value of the biosulfur-containing liquid flowing into the dehydration process and the vehicle speed value of the dehydrator for drying the biosulfur. Dehydration process to control the biosulfur moisture content in the range of 45 to 55% on average even if the S-load changes in a certain range by maintaining within a certain range satisfying the

   [Equation 3] 100 <Imhoff (ml / L) <400

   Equation 1 3? Imhoff (ml / L) / vehicle speed value (rpm)? 27
2. The method of claim 1,

   Dehydration process to control the biosulfur moisture content by maintaining the dehydrator vehicle speed value of the dehydration process within a certain range satisfying the following equation for biosulfur drying

   Equation 2 15 ≤ vehicle speed value (rpm) ≤ 30
3. The method of claim 1,

   Dehydration process to control the biosulfur moisture content by maintaining the Imhoff value of the biosulfur-containing liquid flowing into the dehydration process for the biosulfur drying within a certain range satisfying the following equation.

   Equation 4 150 ≤ Imhoff (ml / L) ≤ 300
4. The method of claim 1,

   Dehydration process for controlling the biosulfur moisture content, characterized in that the moisture content of the produced biosulfur is maintained in the range of 47 to 52% on average
5. The method of claim 1,

   Dehydration process for controlling the biosulfur moisture content, characterized by decreasing the dehydrator vehicle speed value to keep the moisture content of the biosulfur constant when the Imhoff value decreases
6. The method of claim 1,

   If the Imhoff value is increased, the dehydration process for controlling the biosulfur moisture content is characterized by increasing the dehydrator vehicle speed value to keep the moisture content of the biosulfur constant.

Images