Deep desulfurization wastewater treatment system

Abstract

The utility model discloses a deep desulfurization wastewater treatment system which comprises a PLC (Programmable Logic Controller) control system, a dosing system as well as a neutralization tank, a settling tank, a flocculation tank, a clarification concentrator, an intermediate water tank, a silicon carbide ceramic membrane filter and a water outlet tank which are connected in sequence, a first PH value detector is arranged in the neutralization box; a sludge scraper is arranged in the clarification concentrator, sludge discharge branch pipes are arranged at the bottoms of the neutralization box, the settling box, the flocculation box and the clarification concentrator, the sludge discharge branch pipes are connected with a sludge filter press through a sludge discharge header pipe, and a cleaning spray pipe is arranged at the top of the sludge filter press. The automation degree is high.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, and in particular to a phosphate saponification wastewater treatment system. Background Technology

[0002] Desulfurization wastewater is weakly acidic and contains large amounts of salts, heavy metal ions, acid radicals, halide ions, and suspended solids (SS). Traditional treatment methods involve chemical or mechanical separation of heavy metals and other precipitable substances. The desulfurization wastewater undergoes neutralization, reaction, flocculation, and sedimentation to remove heavy metals and other suspended impurities. The precipitated sludge is dewatered, and the remaining sludge cake is transported to a slag yard for comprehensive treatment.

[0003] Chinese patent CN203700066U discloses a desulfurization wastewater treatment system, including a filtrate tank, a neutralization tank, a settling tank, a flocculation tank, a clarifier / concentrator, a pH adjustment tank, a carbon hydroxide dispenser, a composite iron dispenser, an organic carbon dispenser, a safety shower, and an acid mist absorber. The output end of the filtrate tank is connected to the input end of the neutralization tank, the output end of the neutralization tank is connected to the input end of the settling tank, the output end of the settling tank is connected to the input end of the flocculation tank, the output end of the flocculation tank is connected to the input end of the clarifier / concentrator, the output end of the clarifier / concentrator is connected to the input end of the pH adjustment tank, the carbon hydroxide dispenser is connected to the neutralization tank, the composite iron dispenser and the organic carbon dispenser are both connected to the settling tank, and the safety shower and the acid mist absorber are both connected to the clarifier / concentrator. Like most desulfurization wastewater treatment devices currently on the market, this patent cannot guarantee the quality and stability of the effluent, therefore the final effluent cannot be reused or can only be reused in some low-requirement water use situations. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a deep desulfurization wastewater treatment system with complete structure, full functions, high effluent quality, good stability, and high degree of automation.

[0005] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows:

[0006] A deep desulfurization wastewater treatment system includes a PLC control system, a dosing system, and a neutralization tank, a settling tank, a flocculation tank, a clarifier / thickener, an intermediate water tank, a silicon carbide ceramic membrane filter, and an effluent tank connected in sequence. A first pH meter is installed in the neutralization tank. A sludge scraper is installed in the clarifier / thickener. Sludge discharge branch pipes are installed at the bottom of the neutralization tank, settling tank, flocculation tank, and clarifier / thickener. These branch pipes are connected to a sludge filter press via a main sludge discharge pipe. A cleaning spray pipe with several cleaning nozzles is installed at the top of the sludge filter press. The liquid outlet is connected to the buffer tank, which is connected to the neutralization tank. The outlet tank is equipped with a discharge pipe and a return pipe, which is connected to the neutralization tank. The silicon carbide ceramic membrane filter includes a tank body, inside which are arranged several columnar silicon carbide ceramic membranes with closed ends. The top of the silicon carbide ceramic membrane is equipped with a backwash inlet and a filtered water outlet, both of which are connected to the outlet tank. The side wall of the tank body is equipped with a sewage inlet connected to the intermediate water tank, and the bottom of the tank is equipped with a wastewater outlet connected to the neutralization tank. The first pH value detector is connected to the PLC control system.

[0007] Preferably, the dosing system includes a sodium hydroxide dosing tank, an organosulfur dosing tank, a coagulant dosing tank, a flocculant dosing tank, and a hydrochloric acid dosing tank. The sodium hydroxide dosing tank is connected to a neutralization tank via a first dosing pipe, and a first metering pump is installed on the first dosing pipe. The organosulfur dosing tank is connected to a settling tank via a second dosing pipe, and a second metering pump is installed on the second dosing pipe. The coagulant dosing tank is connected to the settling tank via a third dosing pipe, and a third metering pump is installed on the third dosing pipe. The flocculant dosing tank is connected to a flocculation tank via a fourth dosing pipe, and a fourth metering pump is installed on the fourth dosing pipe. The hydrochloric acid dosing tank is connected to a cleaning spray pipe and an outlet tank via a fifth and a sixth dosing pipe, respectively, and a fifth metering pump is installed on the fifth dosing pipe and a sixth metering pump. The first, second, third, fourth, fifth, and sixth metering pumps are all connected to a PLC control system.

[0008] Preferably, a second pH value detector is also installed in the water outlet tank, and a water outlet valve and a water outlet pump are installed on the pipeline between the filtered water outlet and the water outlet tank; a backwash valve and a backwash pump are installed on the pipeline between the backwash inlet and the water outlet tank, and the water outlet valve, water outlet pump, backwash valve and backwash pump are all connected to the PLC control system.

[0009] Preferably, the water outlet tank is also equipped with a dosing water outlet pipe, which is connected to the sodium hydroxide dosing tank, the organic sulfur dosing tank, the coagulant dosing tank, the flocculant dosing tank, and the hydrochloric acid dosing tank, respectively. The dosing water outlet pipe is equipped with a solenoid valve, which is connected to the PLC control system. Preferably, the return pipe is equipped with a return pump, which is connected to the PLC control system.

[0010] The beneficial effects of this utility model are:

[0011] First: This system has a complete structure and full functions. It adopts a chemical process of neutralization, complexation and flocculation sedimentation, and uses silicon carbide ceramic membranes to ensure the quality of the final effluent.

[0012] Second: Because the final effluent quality is good, the final effluent can be reused for chemical preparation and backwashing to clean the silicon carbide ceramic membrane, thus saving water resources;

[0013] Third: No need to introduce clean water. The concentration of wastewater entering the neutralization tank can be adjusted by using the effluent from the buffer tank and the return water from the effluent tank, avoiding excessively high wastewater concentration and reducing the amount of chemicals used.

[0014] Fourth: Use a PLC control system to control various valves, detection devices, pumps, etc. within the system to achieve fully automatic control. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] In the diagram: 1 is the PLC control system, 2 is the neutralization tank, 3 is the settling tank, 4 is the flocculation tank, 5 is the clarifier / concentrator, 5.1 is the sludge scraper, 6 is the intermediate water tank, 7 is the silicon carbide ceramic membrane filter, 7.1 is the silicon carbide ceramic membrane, 7.2 is the backwash inlet, 7.3 is the filtered water outlet, 7.4 is the sewage inlet, 7.5 is the wastewater outlet, 8 is the effluent tank, 8.1 is the discharge pipe, 8.2 is the return pipe, 9 is the first pH meter, 10 is the sludge discharge branch pipe, 11 is the sludge filter press, 12 is the cleaning spray pipe, 1 3 is a buffer tank, 14 is a sodium hydroxide dosing tank, 15 is an organosulfur dosing tank, 16 is a coagulant dosing tank, 17 is a flocculant dosing tank, 18 is a hydrochloric acid dosing tank, 19 is the first metering pump, 20 is the second metering pump, 21 is the third metering pump, 22 is the fourth metering pump, 23 is the fifth metering pump, 24 is the sixth metering pump, 25 is the second pH meter, 26 is the outlet valve, 27 is the outlet pump, 28 is the backwash valve, 29 is the backwash pump, 30 is the dosing water outlet pipe, 31 is the solenoid valve, and 32 is the return pump. Detailed Implementation

[0017] The technical solutions in the embodiments of this utility model will now be clearly and completely described with reference to the accompanying drawings. Example 1

[0018] A deep desulfurization wastewater treatment system includes a PLC control system 1, a dosing system, and a neutralization tank 2, a settling tank 3, a flocculation tank 4, a clarifier / thickener 5, an intermediate water tank 6, a silicon carbide ceramic membrane filter 7, and an effluent tank 8 connected in sequence. A first pH meter 9 is installed inside the neutralization tank 2. A sludge scraper 5.1 is installed inside the clarifier / thickener 5. Sludge discharge branch pipes 10 are installed at the bottom of the neutralization tank 2, settling tank 3, flocculation tank 4, and clarifier / thickener 5. The sludge discharge branch pipes 10 are connected to a sludge filter press 11 via a main sludge discharge pipe. A cleaning spray pipe 12 is installed at the top of the sludge filter press 11, and several cleaning nozzles are installed on the cleaning spray pipe 12. The filtrate outlet of the sludge filter press 11 is connected to a buffer tank 13, which is connected to the neutralization tank 2. A discharge pipe 8.1 and... A return pipe 8.2 is connected to the neutralization tank 2. The silicon carbide ceramic membrane filter 7 includes a tank body, inside which are arranged several columnar silicon carbide ceramic membranes 7.1 with closed ends. The top of the silicon carbide ceramic membrane is provided with a backwash inlet 7.2 and a filtered water outlet 7.3, both of which are connected to the outlet tank 8. The side wall of the tank body is provided with a sewage inlet 7.4 connected to the intermediate water tank 6, and the bottom of the tank body is provided with a wastewater outlet 7.5 connected to the neutralization tank 2. The first pH value detector 9 is connected to the PLC control system 1 (not shown in the figure). Sewage enters the silicon carbide ceramic membrane 7.1 from the outside, filtered water is discharged from the filtered water outlet 7.3, and wastewater flows back to the neutralization tank 2 (not shown in the figure) from the wastewater outlet 7.5.

[0019] Preferably, the dosing system includes a sodium hydroxide dosing tank 14, an organosulfur dosing tank 15, a coagulant dosing tank 16, a flocculant dosing tank 17, and a hydrochloric acid dosing tank 18. The sodium hydroxide dosing tank 14 is connected to the neutralization tank 2 via a first dosing pipe, and a first metering pump 19 is installed on the first dosing pipe. The organosulfur dosing tank 15 is connected to the settling tank 3 via a second dosing pipe, and a second metering pump 20 is installed on the second dosing pipe. The coagulant dosing tank 16 is connected to the settling tank 3 via a third dosing pipe, and a third metering pump 21 is installed on the third dosing pipe. The flocculant dosing tank 17 is connected to the flocculation box 4 via a fourth dosing pipe, and a fourth metering pump 22 is installed on the fourth dosing pipe; the hydrochloric acid dosing tank 18 is connected to the cleaning spray pipe 12 and the outlet water tank 8 via a fifth dosing pipe and a sixth dosing pipe, respectively, and a fifth metering pump 23 is installed on the fifth dosing pipe and a sixth metering pump 24 is installed on the sixth dosing pipe; the first metering pump 19, the second metering pump 20, the third metering pump 21, the fourth metering pump 22, the fifth metering pump 23 and the sixth metering pump 24 are all connected to the PLC control system 1 (not shown in the figure).

[0020] Preferably, a second pH value detector 25 is also installed in the water outlet tank 8, and a water outlet valve 26 and a water outlet pump 27 are installed on the pipeline between the filtered water outlet 7.3 and the water outlet tank 8; a backwash valve 28 and a backwash pump 29 are installed on the pipeline between the backwash inlet 7.2 and the water outlet tank 8, and the water outlet valve 26, the water outlet pump 27, the backwash valve 28 and the backwash pump 29 are all connected to the PLC control system 1 (not shown in the figure).

[0021] Preferably, the water outlet tank 8 is also equipped with a dosing water outlet pipe 30, which is connected to the sodium hydroxide dosing tank 14, the organic sulfur dosing tank 15, the coagulant dosing tank 16, the flocculant dosing tank 17, and the hydrochloric acid dosing tank 18 respectively. The dosing water outlet pipe 30 is equipped with a solenoid valve 31, which is connected to the PLC control system 1 (not shown in the figure).

[0022] Preferably, a reflux pump 32 is installed on the reflux pipe 8.2, and the reflux pump 32 is connected to the PLC control system 1 (not shown in the figure).

[0023] The first pH value detector 9 detects the pH value in the neutralization tank 2 and feeds it back to the PLC control system 1. The PLC control system 1 controls the dosing flow rate of the first metering pump 19 to stabilize the pH value of the wastewater. At the same time, the PLC control system 1 controls the dosing amount of each stage by controlling the second metering pump 20, the third metering pump 21, the fourth metering pump 22, the fifth metering pump 23 and the sixth metering pump 24.

[0024] Desulfurization wastewater is weakly acidic and contains a large amount of salts and heavy metal ions. This system primarily targets heavy metal ions, acid radicals, halide ions, and suspended solids (SS). It employs a chemical process involving neutralization, complexation, and flocculation sedimentation, utilizing silicon carbide ceramic membranes to ensure final effluent quality. The advantages of silicon carbide ceramic membranes include: long-term use in harsh environments where traditional membrane separation materials cannot withstand strong acids and alkalis (pH 0–14) and high temperatures (800℃); excellent performance in key indicators such as flux, porosity (45%), and strength; negatively charged membrane layers; and good stability in terms of permeate flow to most wastewaters, especially oil-water separation (non-sticking to oil). This allows for membrane separation processes in harsh environments such as strong acids, strong alkalis, and oil-water separation, ensuring both the quality and stability of the final effluent. The treated effluent can be reused for chemical preparation and backwashing.

[0025] The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A deep desulfurization wastewater treatment system, characterized in that: The system includes a PLC control system (1), a dosing system, and a neutralization tank (2), a settling tank (3), a flocculation tank (4), a clarifier (5), an intermediate water tank (6), a silicon carbide ceramic membrane filter (7), and an outlet water tank (8) connected in sequence. A first pH value detector (9) is installed in the neutralization tank (2). A sludge scraper (5.1) is installed in the clarifier (5). Sludge discharge branch pipes (10) are installed at the bottom of the neutralization tank (2), the settling tank (3), the flocculation tank (4), and the clarifier (5). The sludge discharge branch pipes (10) are connected to the sludge through the sludge discharge main pipe. A filter press (11) is connected, and a cleaning spray pipe (12) is installed on the top of the sludge filter press (11). Several cleaning nozzles are installed on the cleaning spray pipe (12). The filtrate outlet of the sludge filter press (11) is connected to a buffer tank (13). The buffer tank (13) is connected to a neutralization tank (2). A discharge pipe (8.1) and a return pipe (8.2) are installed on the effluent tank (8). The return pipe (8.2) is connected to the neutralization tank (2). The silicon carbide ceramic membrane filter (7) includes a tank body. Several columnar silicon carbide ceramic membranes with closed ends are installed inside the tank body. 7.1) The top of the silicon carbide ceramic membrane is provided with a backwash inlet (7.2) and a filtered water outlet (7.3). Both the backwash inlet (7.2) and the filtered water outlet (7.3) are connected to the water outlet tank (8). The side wall of the tank is provided with a sewage inlet (7.4) connected to the intermediate water tank (6). The bottom of the tank is provided with a wastewater outlet (7.5) connected to the neutralization tank (2). The first pH value detector (9) is connected to the PLC control system (1).

2. The deep desulfurization wastewater treatment system according to claim 1, characterized in that: The dosing system includes a sodium hydroxide dosing tank (14), an organosulfur dosing tank (15), a coagulant dosing tank (16), a flocculant dosing tank (17), and a hydrochloric acid dosing tank (18). The sodium hydroxide dosing tank (14) is connected to the neutralization tank (2) via a first dosing pipe, and a first metering pump (19) is installed on the first dosing pipe. The organosulfur dosing tank (15) is connected to the settling tank (3) via a second dosing pipe, and a second metering pump (20) is installed on the second dosing pipe. The coagulant dosing tank (16) is connected to the settling tank (3) via a third dosing pipe, and a third metering pump (21) is installed on the third dosing pipe. The flocculant dosing tank (17) is connected to the flocculation box (4) through the fourth dosing pipe, and the fourth dosing pipe is equipped with a fourth metering pump (22); the hydrochloric acid dosing tank (18) is connected to the cleaning spray pipe (12) and the outlet tank (8) through the fifth dosing pipe and the sixth dosing pipe respectively, and the fifth dosing pipe is equipped with a fifth metering pump (23), and the sixth dosing pipe is equipped with a sixth metering pump (24); the first metering pump (19), the second metering pump (20), the third metering pump (21), the fourth metering pump (22), the fifth metering pump (23) and the sixth metering pump (24) are all connected to the PLC control system (1).

3. The deep desulfurization wastewater treatment system according to claim 1, characterized in that: The outlet tank (8) is also equipped with a second pH value detector (25). The pipeline between the filtered water outlet (7.3) and the outlet tank (8) is equipped with an outlet valve (26) and an outlet pump (27). The pipeline between the backwash inlet (7.2) and the outlet tank (8) is equipped with a backwash valve (28) and a backwash pump (29). The outlet valve (26), the outlet pump (27), the backwash valve (28) and the backwash pump (29) are all connected to the PLC control system (1).

4. The deep desulfurization wastewater treatment system according to claim 1, characterized in that: The water outlet tank (8) is also equipped with a dosing water outlet pipe (30), which is connected to the sodium hydroxide dosing tank (14), the organic sulfur dosing tank (15), the coagulant dosing tank (16), the flocculant dosing tank (17), and the hydrochloric acid dosing tank (18), respectively. The dosing water outlet pipe (30) is equipped with a solenoid valve (31), which is connected to the PLC control system (1).

5. The deep desulfurization wastewater treatment system according to claim 1, characterized in that: A reflux pump (32) is installed on the reflux pipe (8.2), and the reflux pump (32) is connected to the PLC control system (1).

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