CN-120573925-B - Multistage sludge screening device and sewage treatment system

CN120573925BCN 120573925 BCN120573925 BCN 120573925BCN-120573925-B

Abstract

The application provides a multistage sludge screening device and a sewage treatment system. The device is used for screening sludge of a sewage treatment unit and comprises a first number of first cyclones, a second number of second cyclones and a third number of third cyclones, specification parameters of the first cyclones, the second cyclones and the third cyclones are gradually reduced, a feed inlet of each first cyclone is used for receiving the sludge of the sewage treatment unit, overflow ports are communicated with the feed inlet of each second cyclone, underflow ports are communicated with a first pipeline, the other end of the first pipeline is communicated with a main pipeline, overflow ports of each second cyclone are communicated with the feed inlet of the third cyclones, underflow ports of each third cyclone are communicated with a second pipeline, and overflow ports of each third cyclone are communicated with the main pipeline through a fourth pipeline. The multistage sludge screening device and the sewage treatment system can pertinently improve the performance of sludge and effectively improve the sewage treatment efficiency.

Inventors

ZHANG PEIYAO
XUE XIAOFEI
GAO SHIXIONG
HU WEIZHENG

Assignees

杭州北水未来科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250430

Claims (10)

1. A multi-stage sludge screening device is characterized by being used for screening sludge of a sewage treatment unit and comprising a first number of first cyclones, a second number of second cyclones and a third number of third cyclones, wherein specification parameters of the first cyclones, the second cyclones and the third cyclones are gradually reduced; each of the first cyclone, the second cyclone and the third cyclone comprises a cyclone main body, an overflow port arranged at the top of the cyclone main body, a bottom flow port arranged at the bottom of the cyclone main body and a feed port arranged on the side wall of the cyclone main body; The feeding port of each first cyclone is used for receiving sludge of the sewage treatment unit, the overflow port is communicated with the feeding port of the second cyclone, the underflow port is communicated with a first pipeline, the other end of the first pipeline is communicated with a main pipeline, and the main pipeline is used for discharging underflow materials to external sludge storage equipment; The overflow port of each second cyclone is communicated with the feed inlet of the third cyclone, the underflow port is communicated with a second pipeline, and the second pipeline is used for refluxing the screened sludge to the sewage treatment unit; The underflow opening of each third cyclone is communicated with a third pipeline, the overflow opening is communicated with the main pipeline through a fourth pipeline, and the third pipeline is used for discharging underflow materials of the third cyclones to external mud storage equipment or refluxing the underflow materials to the sewage treatment unit.
2. The multi-stage sludge screening apparatus of claim 1, wherein the operating modes of the apparatus include a first mode, a second mode, a third mode, a fourth mode, a fifth mode, a sixth mode, and a seventh mode; In the first mode, the first pipeline is in an open state, the second pipeline and the fourth pipeline are in a closed state, and the third pipeline is used for refluxing the underflow material of the third cyclone to the sewage treatment unit; In the second mode, the second pipeline is in an open state, the first pipeline and the fourth pipeline are in a closed state, and the third pipeline is used for discharging the underflow material of the third cyclone to external mud storage equipment; in the third mode, the fourth pipeline is in an open state, the first pipeline and the second pipeline are in a closed state, and the third pipeline is used for refluxing the underflow material of the third cyclone to the sewage treatment unit; In the fourth mode, the first pipeline and the second pipeline are in an open state, the fourth pipeline is in a closed state, and the third pipeline is used for discharging underflow materials of the third cyclone to external mud storage equipment; In the fifth mode, the first pipeline and the fourth pipeline are in an open state, the second pipeline is in a closed state, and the third pipeline is used for refluxing the underflow material of the third cyclone to the sewage treatment unit; In the sixth mode, the second pipeline and the fourth pipeline are in an open state, the first pipeline is in a closed state, and the third pipeline is used for refluxing the underflow material of the third cyclone to the sewage treatment unit; In the seventh mode, the first pipeline, the second pipeline and the fourth pipeline are all in an open state, and the third pipeline is used for refluxing the underflow material of the third cyclone to the sewage treatment unit.
3. The multi-stage sludge screening apparatus of claim 1, wherein the first number is less than or equal to the second number, and wherein the second number is less than or equal to a third number.
4. The multi-stage sludge screening apparatus according to claim 1, wherein the first number has a value range of 1 to 4, the second number has a value range of 2 to 10, and the third number has a value range of 4 to 20.
5. The multi-stage sludge screening apparatus of claim 1, wherein the first number is calculated by: Acquiring the current sewage treatment scale of the sewage treatment unit; Determining a first target value, a target operation period and a first specification parameter and an initial underflow ratio of the first cyclone for improving the organic matter sludge ratio based on the sewage treatment unit; Calculating a first target coefficient based on the initial underflow ratio, the target running period and the first target value; and determining the first quantity according to the current sewage treatment scale, the first target coefficient and the first specification parameter.
6. The multi-stage sludge screening apparatus according to claim 5, wherein the first target coefficient is calculated by the following formula: w 2 ＝X 0 ·(1-n)·l·a·Q w′ 2 ＝X 0 ·n·l·a·Q Wherein G 1 is the first target value, T is the target operation period, a is a first target coefficient, w 0 is the current organic sludge quality of the sewage treatment unit, w 1 is the daily-increased organic sludge quality of the sewage treatment unit, w 2 is the daily-discharged organic sludge quality of the sewage treatment unit, w 0 ' is the current inorganic sludge quality of the sewage treatment unit, w 1 ' is the daily-increased inorganic sludge quality of the sewage treatment unit, w 2 ' is the daily-discharged inorganic sludge quality of the sewage treatment unit, X 0 is the sludge concentration entering the sewage treatment unit, n is the inorganic sludge duty constant of the first cyclone sludge discharge, l is the initial underflow ratio, and Q is the current sewage treatment scale.
7. The multi-stage sludge screening apparatus according to claim 6, wherein the daily-increase organic sludge mass in the sewage treatment unit is calculated by the following formula: w 1 ＝YQ 0 (S o -S e )-k d VfX The daily-increase inorganic sludge mass in the sewage treatment unit is calculated by the following formula: w 1 ′＝Q 0 (T ss -T s )×50% Wherein Y is the sludge yield coefficient, Q 0 is the design scale of the sewage treatment unit, S o is the BOD 5 ,S e of the inlet water of the sewage treatment unit, BOD 5 ,k d of the outlet water of the sewage treatment unit is the endogenous metabolic coefficient, V is the biochemical tank capacity of the sewage treatment unit, f is the current organic sludge ratio of the sewage treatment unit, X is the current sludge concentration of the sewage treatment unit, T ss is the inlet water ss concentration of the sewage treatment unit, and T s is the outlet water ss concentration of the sewage treatment unit.
8. The multi-stage sludge screening apparatus according to claim 1, wherein the second number is calculated by: obtaining a sewage treatment design scale and a sludge discharge constant of the sewage treatment unit; determining a second specification parameter and a first overflow ratio of the second cyclone based on the sewage treatment unit; determining a second target coefficient based on the mud discharge constant and the first overflow ratio; And determining the second quantity according to the second target coefficient, the sewage treatment design scale and the second specification parameter.
9. The multi-stage sludge screening apparatus according to claim 1, wherein the third number is calculated by: Determining a third target value for total sewage treatment lifting and a third specification parameter and a second overflow ratio of the third cyclone based on the sewage treatment unit; Acquiring a sludge discharge constant of the sewage treatment unit, and determining a third target coefficient based on the sludge discharge constant and the second overflow ratio; and determining the third quantity according to the third target coefficient, the third target value and the third specification parameter.
10. A sewage treatment system, characterized by comprising a sewage treatment unit and the multi-stage sludge screening device according to any one of claims 1 to 9; the sewage treatment unit is provided with a mud inlet and a mud outlet, and the mud outlet is communicated with the feed inlet of each first cyclone through a mud outlet pipeline and is used for leading the mud in the sewage treatment unit into the multi-stage mud screening device; the mud inlet is communicated with the second pipeline through a first backflow pipeline and is also communicated with the third pipeline through a second backflow pipeline; the main pipeline is communicated with external mud storage equipment through a first external exhaust pipeline, and the third pipeline is also communicated with external mud storage equipment through a second external exhaust pipeline; wherein the second exhaust line is not opened at the same time as the second return line.

Description

Multistage sludge screening device and sewage treatment system Technical Field The application relates to the technical field of sewage treatment, in particular to a multi-stage sludge screening device and a sewage treatment system. Background In the sewage treatment process, the performance of the sludge is closely related to the sewage treatment capacity, efficiency, effluent quality and the like. In the prior art, sludge in the sewage treatment process is screened by adopting sludge screening equipment, so that the performance of the sludge can be improved to a certain extent, and the treatment efficiency of the sewage treatment process is improved. However, the sludge screening equipment in the prior art is generally single in function, difficult to meet the requirement of multiple changes in the sewage treatment process, and limited in application scene. Disclosure of Invention Accordingly, the present application is directed to a multi-stage sludge screening device and a sewage treatment system for solving the above-mentioned problems. The application provides a multi-stage sludge screening device which is used for screening sludge of a sewage treatment unit, and comprises a first number of first cyclones, a second number of second cyclones and a third number of third cyclones, wherein the specification parameters of the first cyclones, the second cyclones and the third cyclones are gradually reduced; each of the first cyclone, the second cyclone and the third cyclone comprises a cyclone main body, an overflow port arranged at the top of the cyclone main body, a bottom flow port arranged at the bottom of the cyclone main body and a feed port arranged on the side wall of the cyclone main body; The feeding port of each first cyclone is used for receiving sludge of the sewage treatment unit, the overflow port is communicated with the feeding port of the second cyclone, the underflow port is communicated with a first pipeline, the other end of the first pipeline is communicated with a main pipeline, and the main pipeline is used for discharging underflow materials to external sludge storage equipment; The overflow port of each second cyclone is communicated with the feed inlet of the third cyclone, the underflow port is communicated with a second pipeline, and the second pipeline is used for refluxing the screened sludge to the sewage treatment unit; The underflow opening of each third cyclone is communicated with a third pipeline, the overflow opening is communicated with the main pipeline through a fourth pipeline, and the third pipeline is used for discharging underflow materials of the third cyclones to external mud storage equipment or refluxing the underflow materials to the sewage treatment unit. In a second aspect, the application provides a sewage treatment system, which comprises a sewage treatment unit and the multi-stage sludge screening device in the first aspect; the sewage treatment unit is provided with a mud inlet and a mud outlet, and the mud outlet is communicated with the feed inlet of each first cyclone through a mud outlet pipeline and is used for leading the mud in the sewage treatment unit into the multi-stage mud screening device; the mud inlet is communicated with the second pipeline through a first backflow pipeline and is also communicated with the third pipeline through a second backflow pipeline; the main pipeline is communicated with external mud storage equipment through a first external exhaust pipeline, and the third pipeline is also communicated with external mud storage equipment through a second external exhaust pipeline; wherein the second exhaust line is not opened at the same time as the second return line. From the above, the application provides a multi-stage sludge screening device and a sewage treatment system, which realize different functions by arranging three cyclones with different specification parameters, wherein the specification parameter of the first cyclone is the largest, i.e. the design treatment capacity or diameter is the largest, and the first cyclone is mainly used for separating organic matters and inorganic matters in sludge and improving the organic matter proportion in the sludge; the specification parameters of the second cyclone are smaller than those of the first cyclone and larger than those of the third cyclone, namely the design treatment capacity or the diameter is moderate, and the generated shearing force is moderate, so that the generation of granular sludge is mainly promoted, and the granulation degree of the sludge is improved; the device has multiple functions, can improve multiple performances of the sludge at the same time, can improve pertinently according to the actual condition of the sewage treatment unit, effectively improves the total sewage amount, sewage load capacity, effluent quality, sewage treatment efficiency and the like which can be treated by the sewage treatment unit, and ensures that the sewage treatment uni