CN-118666406-B - Ecological treatment system for rapidly eliminating black and odorous water body and ecological purification method thereof

CN118666406BCN 118666406 BCN118666406 BCN 118666406BCN-118666406-B

Abstract

The invention provides an ecological treatment system for rapidly eliminating black and odorous water and an ecological purification method thereof, wherein the ecological treatment system comprises a super-nanometer gas-soluble reoxygenation system and an automatic dissolved oxygen monitoring system; the invention relates to an ecological purifying method for rapidly eliminating black and odorous water, which comprises the steps of adopting the ecological treating system to treat the black and odorous water, treating the black and odorous water in a manner of sufficiently reoxygenating the water, and avoiding any chemical agent and microbial agent delivery, avoiding secondary pollution of the water, avoiding bubbles visible to naked eyes, avoiding disturbance of the water, and achieving the purpose of rapidly eliminating black and odorous.

Inventors

CHEN XIANKUN
MIN ZHICHENG
WEN XIAOBING
LU YALI
CHEN LONG

Assignees

湖北祺润生态建设有限公司

Dates

Publication Date: 20260512
Application Date: 20240604

Claims (7)

1. The ecological treatment system for rapidly eliminating the black and odorous water body is characterized by comprising a super-nanometer gas-soluble reoxygenation system and a dissolved oxygen automatic monitoring system, wherein the super-nanometer gas-soluble reoxygenation system comprises super-nanometer gas-soluble equipment, a water inlet pipeline and a water outlet pipeline which are communicated with the super-nanometer gas-soluble equipment; The ultra-nanometer gas dissolving equipment comprises a conical gas dissolving tank, wherein the contact radius R of the conical gas dissolving tank is calculated as follows: (1) Wherein, the contact radius of the R-conical dissolved air tank is m; r 1 is the radius of the upper bottom of the conical dissolved air tank, m; R 2 is the radius of the lower bottom of the conical dissolved air tank, m; h, height of the conical dissolved air tank, m; z-coordinate refers to the height coordinate of a certain point inside the conical dissolved air tank relative to the conical bottom; the calculation formula of the effective cross-section area A of the conical dissolved air tank is as follows: (2) wherein, the effective cross-sectional area of the A-conical dissolved air tank, m 2 ; R is the contact radius of the conical dissolved air tank, m; Pi-circumference ratio; The calculation formula of the water flow rate V s in the conical dissolved air tank is as follows: (3) V s , the water flow rate, m/s; Q w -water flow, m 3 /s; a is the effective cross-sectional area of the conical dissolved air tank, m 2 ; The calculation formula of the oxygen mass transfer capacity J of the conical dissolved air tank is as follows: (4) (5) Wherein, J-the oxygen mass transfer capacity of the conical dissolved air tank, mol/(m 2 . S); K OL —mass transfer coefficient, m/s, related to oxygen bubble radius r, K OL =0.6r（r＜6.67×10 -4 m) or K OL =4×10 -4 （r≥6.67×10 -4 m); C s -saturated dissolved oxygen concentration of water body, mol/m 3 ; C 0 -initial dissolved oxygen concentration of water body, mol/m 3 ; K-Henry constant, mol/(Pa.m 3 ); P i -pressure of oxygen at a certain depth, pa; the calculation formula of the residence time t of the oxygen bubbles in the conical dissolved air tank is as follows: (6) Wherein, t is the residence time of the oxygen bubbles in the conical dissolved air tank, s; k 1 , namely a bubble rising coefficient of 0.2-0.5, and is dimensionless; h, height of the conical dissolved air tank, m; v b -oxygen bubble rising velocity, m/s, oxygen bubble radius r satisfying r < 7X 10 -4 m, ;7×10 -4 ≤r＜5.1×10 -3 m, ;r≥5.1×10 -3 m, ; The calculation formula of the height h 1 of the gas-liquid mixing area in the conical dissolved air tank is as follows: (7) Wherein h 1 is the height of a gas-liquid mixing area in the conical dissolved air tank, m; h, height of the conical dissolved air tank, m; v s -water flow rate, m/s; v b -oxygen bubble rise rate, m/s; k is an empirical parameter, 0.3-0.4, dimensionless; t is the residence time of oxygen bubbles in the conical dissolved air tank, s; The calculation formula of the residence time t 1 of the oxygen bubbles in the water outlet pipeline is as follows: (8) wherein t 1 is the residence time of oxygen bubbles in the water outlet pipeline, s; Q w -water flow, m 3 /s; r 3 is the inner diameter of the water outlet pipeline, m; L-length of water outlet pipeline, m; Pi-circumference ratio; The total residence time of the oxygen bubbles in the ultra-nanometer gas-dissolving equipment and the water outlet pipeline is 60-90 s; the pressure in the conical dissolved air tank is 0.4-0.6 MPa.
2. The ecological treatment system for rapidly eliminating black and odorous water body according to claim 1, wherein the water outlet pipeline is divided into multiple paths and is respectively arranged at different points.
3. The ecological treatment system for rapidly eliminating black and odorous water body according to claim 2, wherein the length of the water outlet pipeline is 10-500 m, and the pipe diameter is 20-100 mm.
4. The ecological treatment system for rapidly eliminating black and odorous water body according to claim 1, wherein the pipe diameter of the water inlet pipe is 300-400 mm.
5. The ecological treatment system for rapidly eliminating black and odorous water body according to claim 1, wherein the oxygen generating system is an oxygen generator for generating oxygen or a dewar tank for bottling liquid oxygen.
6. An ecological purification method for rapidly eliminating black and odorous water body, which adopts the ecological treatment system for rapidly eliminating black and odorous water body according to any one of claims 1 to 5, and is characterized by comprising the following steps: S1, detecting the water quality and the water quantity of a black and odorous water body, and calculating the target oxygen demand of the black and odorous water body; s2, arranging a super-nanometer gas-soluble device at the tail end of the open channel to be treated, arranging a water inlet pipeline and a water outlet pipeline, and arranging automatic dissolved oxygen monitoring points along the way; s3, starting the ultra-nanometer gas-soluble equipment, setting running time according to the water dissolved oxygen content displayed by the automatic dissolved oxygen monitoring point when the water dissolved oxygen starts to rise, starting the equipment when the minimum dissolved oxygen content of the monitoring point is lower than 6mg/L, and closing the equipment when the minimum dissolved oxygen content is higher than 12 mg/L.
7. The method for ecologically purifying a rapid elimination black and odorous water body according to claim 6, wherein the target oxygen demand comprises five days of biochemical oxygen demand, ammonia nitrogen oxidation oxygen demand, and sediment remediation oxygen demand.

Description

Ecological treatment system for rapidly eliminating black and odorous water body and ecological purification method thereof Technical Field The invention relates to the technical field of sewage treatment, in particular to an ecological treatment system for rapidly eliminating black and odorous water bodies and an ecological purification method thereof. Background The urban black and odorous water body is mainly formed by a backward urban drainage system, such as a mixed joint, a staggered joint, a missing joint and the like of a combined drainage pipeline and a split system in an old urban area can cause a large amount of domestic sewage to overflow into a rainwater system, high-load organic pollution greatly exceeds the self-cleaning capacity of the river and the lake along with the rainwater, so that the oxygen supply and the oxygen consumption of the water body are unbalanced, anaerobic microorganisms are caused to quickly reproduce, a large amount of malodorous gases such as hydrogen sulfide, mercaptan and ammonia gas are generated, meanwhile, the oxidation-reduction potential in the water is quickly reduced, fe 3+ is reduced to Fe 2+, sulfide and Fe 2+ are combined to form blackening substances, the water body is black and odorous, the surrounding ecological environment is seriously influenced, and the sense of obtaining and happiness of the urban ecological environment are reduced. At present, common treatment technologies for urban black and odorous water body treatment comprise technical measures of diversion and transformation of rain and sewage on the shore, primary rain regulation and storage treatment, scale lifting and capacity expansion of a sewage plant and the like so as to realize thorough interception treatment of sewage, but the cost is huge, the treatment is difficult to radically treat, the phenomenon of black and odorous return after rain still exists for a long time, while the traditional technology comprises methods of dredging, diversion and water changing and the like so as to try to quickly remove black and odorous water, the problems of pollution source transfer, high engineering repeated cost and the like can be solved, the problem of difficulty in sustaining exists, and the prior art mostly adopts biological and chemical methods of microbial inoculant, coagulant, deodorant and the like or adopts technical methods of artificial floating islands, aquatic plants and the like to remove black and odorous water, but has little effect and secondary pollution risk to the water body. Because of the anoxic characteristics of the black and odorous water body, a large amount of oxygen supplementing and reoxygenation equipment such as fountain aeration, micro-nano blast aeration, plug flow type aeration machines and the like are simultaneously developed, and the black and odorous water body can quickly eliminate black and deodorize to a certain extent, but has some drawbacks, including disturbance to the water body, low oxygen utilization rate and transfer efficiency, incapability of meeting the bottom anoxic requirement due to surface aeration and the like, and the problems of high operation cost, frequent equipment maintenance and update and the like. In view of the above, it is necessary to design an ecological treatment system and an ecological purification method for rapidly eliminating black and odorous water bodies to solve the above problems. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide an ecological treatment system and an ecological purification method for rapidly eliminating black and odorous water bodies, which have the advantages of no addition of any chemical agent and microbial agent, no secondary pollution to the water bodies, no macroscopic bubbles, no disturbance to the water bodies and capability of achieving the purposes of rapidly eliminating black and odorizing. The invention provides an ecological treatment system for rapidly eliminating black and odorous water, which comprises a super-nanometer gas-soluble reoxygenation system and a dissolved oxygen automatic monitoring system, wherein the super-nanometer gas-soluble reoxygenation system comprises super-nanometer gas-soluble equipment, a water inlet pipeline and a water outlet pipeline which are communicated with the super-nanometer gas-soluble equipment, the dissolved oxygen automatic monitoring system comprises a plurality of dissolved oxygen automatic monitoring points which are arranged along the way, and the super-nanometer gas-soluble equipment is communicated with an oxygen production system through the air inlet pipeline. As a further improvement of the invention, the water outlet pipeline is divided into multiple paths and is respectively arranged at different points. As a further improvement of the invention, the ultra-nanometer gas dissolving equipment comprises a conical gas dissolving tank, and the contact radius R of the conical gas dissolving tank is ca