CN201224691Y

CN201224691Y - Device using vertical electrostatic field to accelerate sludge settling

Info

Publication number: CN201224691Y
Application number: CNU2008200800100U
Authority: CN
Inventors: 杨宏; 邓建诚; 王天瑞; 姚乾; 朱现信
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2008-04-18
Filing date: 2008-04-18
Publication date: 2009-04-22
Anticipated expiration: 2018-04-18

Abstract

The utility model relates to a device for applying vertical static field to accelerate sewage sedimentation, belonging to a technical field of sewage sedimentation, which mainly comprises a sedimentation device and a static field generation device, the static field generation device comprises a DC power source, an anode and a cathode, wherein the cathode is arranged above the sedimentation device and immersed below the liquid surface, the anode is arranged at inner bottom of the sedimentation device, the cathode and the anode are connected with the DC power source by power cord. The sedimentation device is used to fill the to-be-deposited sewages. The utility model can accelerate the sewage sedimentation under the action of low voltage and current, so as to improve sewage sedimentation efficiency, thereby providing feasible base for the improvement of second sedimentation tank process.

Description

The device of using vertical electrostatic field to accelerate sludge settling

Technical field

The utility model relates to a kind of device of using vertical electrostatic field to accelerate sludge settling, belongs to the sludge settling technical field.

Background technology

Second pond is an important process unit in the biological wastewater treatment in the middle of the sewage disposal flow process, possesses clarification and spissated function simultaneously: the one, mud-water separation is carried out in the reaction tank water outlet, and guarantee that the suspended substance in the water outlet reaches emission standard; The 2nd, mud is concentrated, make the microorganism concn that is back in the biological reaction tank remain on certain limit, guarantee the steady running of biological treatment of waste water system.The operation conditions of second pond has material impact to the treatment effect of whole biological treatment of waste water system, it is the important step of whole Waste Water Treatment, no matter therefore carry out mud-water separation from sludge settling, still from mud concentrate to reflux or aspect such as discharging, to improve sludge settling efficient be necessary also be critical.

Traditional settlers such as settling tank all are to carry out sedimentation by the mud self gravitation, and it is slow to have a sedimentation, and settling efficiency is low, and precipitating sludge is subject to disturbance and shortcoming such as floating once more.Simultaneously, because the second pond in the sewage treatment process relies on the mud gravity settling, has the big shortcoming of floor space.

The utility model content

The purpose of this utility model is, in current sewage treatment area, the mudpan settling efficiency is low, precipitating sludge is the problem of existence such as come-up or precipitation instability easily, a kind of static field device that utilizes has been proposed, quicken the sedimentation of charged mud flco by the electrical forces effect, reached the purpose that improves sludge settling efficient and stability.

In order to achieve the above object, the utility model has been taked following technical scheme.Include and be used to hold settler and the electrostatic field generating unit for the treatment of sedimentation mud.The electrostatic field generating unit includes direct supply and anode that is connected with direct supply and negative electrode.Wherein: anode places the settler inner bottom part, and negative electrode places settler top and is dipped in below the mud liquid level, is to treat settled mud between anode and the negative electrode.

Principle of work of the present utility model: owing to mainly be made up of as protein and amino acid larger molecular organics among the EPS (extracellular polymeric) in the mud flco, skew takes place larger molecular organics iso-electric point in water surrounding causes the mud flco to have negative charge.Have this characteristic of negative charge according to the mud flco, this device is incorporated into settler with static field device, be in top at negative electrode, corresponding anode is under the situation of bottom, when electronegative mud flco is subjected to the self gravitation effect, be subjected to the effect of extra electric field power again, the electrical forces direction is consistent with gravity direction, thereby has quickened sludge settling, and the unsuitable floating of feasible sedimentation mud, sedimentation is more stable.

The utility model can be under low voltage, galvanic action, the sedimentation of accelerate sludge, thus improve the settling efficiency of mud, for the improvement of second pond technology in the sewage disposal provides the feasibility foundation.

Description of drawings

The existing precipitation of Fig. 1 cartridge synoptic diagram

Fig. 2 is a device synoptic diagram of the present utility model

Among the figure: 1, direct supply, 2, supply lead, 3, negative electrode, 4, mud mixed liquid, 5, anode, 6, settler.

Embodiment

The utility model is described in further detail below in conjunction with Fig. 2:

Present embodiment includes electrostatic field generating unit and sludge settling device 6 two portions.The electrostatic field generating unit includes direct supply 1, negative electrode 3 and anode 5.Negative electrode 3 all links to each other with direct supply 1 by supply lead with anode 5.At the bottom of the metal anode electrode slice was installed on settler 1 bottom and is close to tin, the metallic cathode electrode slice placed settler 6 tops and treats to be advisable below the sedimentation mud liquid level just to be immersed in, and is to treat the sedimentation mud mixed liquid between metal anode 5 and the negative electrode 3.

Present embodiment is applied to " charged particle in electric field is subjected to the electrical forces effect " this physical property in the sedimentation device of charged mud flco.The electrode shape that is adopted is rationally taked according to actual settler, and the settler that this device adopts is cylindrical, and mark scale maximum value is 400mm, and the device external diameter is 40mm; Electrode adopts conductive metal electrode, and diameter is 35mm, and metal anode and metallic cathode adopt the same diameter size; Power supply is direct supply (the BIO-BAD U.S.), model PowerPac3000, and voltage 0～3000V is adjustable, and electric current is that 0～400mA is adjustable continuously.

The mud that is adopted in the present embodiment requires to cultivate sophisticated active sludge for activated sludge process, and between specific conductivity 700 μ s/cm～1000 μ s/cm, sludge concentration is 2000mg/l～3000mg/l, and that can adopt that the aeration tank water outlet enters second pond treats sedimentation mud.

Specific implementation method is: mud mixed liquid is poured in the settler, be positioned over the electrode cathode tinsel under the liquid level this moment, the degree of depth is advisable with submergence metallic cathode sheet just, open DC power supply switch this moment, adjust voltage of supply 150V, this moment is according to the mud mixed liquid water quality of different specific conductivity, corresponding electric current correspondence is arranged, but require electric current should not be excessive (excessive electric current causes electric hydrolysis to take place, be unfavorable for that sedimentation carries out), be advisable to be no more than 80mA, if electric current is excessive, adjust voltage once more, make electric current less than 80mA.Apply electric field, the mud flco moves downward gradually, and forms extruding, for the clear interface of the very fast formation of the mud of high density, rely on the gravity settling situation through experimental verification interface sinking velocity apparently higher than added electric field control group not, sludge concentration is with 2000mg/l～3000mg/l effect of settling the best.When sludge concentration is 3000mg/l, under the sedimentation time 30min condition, the utility model device subsidence rate is 3.2 times of original device, and by stability experiment as can be known after this device sedimentation mud stability better.

Claims

1, the device of using vertical electrostatic field to accelerate sludge settling includes and is used to hold the settler (6) for the treatment of sedimentation mud; It is characterized in that: also include the electrostatic field generating unit, the electrostatic field generating unit includes direct supply (1) and anode (5) that is connected with direct supply (1) and negative electrode (3); Wherein: anode (5) places settler (6) inner bottom part, and negative electrode (3) places settler (6) top and is dipped in below the mud liquid level, is to treat settled mud between anode (5) and the negative electrode (3).