CN101264974A

CN101264974A - Device for increasing active sludge oxygen-consuming rate by using electrostatic field

Info

Publication number: CN101264974A
Application number: CNA2008101042542A
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: 2008-09-17

Abstract

The invention relates to a device for improving activated sludge oxygen consumption rate by applying electrostatic field and belongs to the technology field of sewage treatment. The device comprises a sewage treatment reactor and an electrostatic field generating device, wherein the electrostatic field generating device comprises an electrostatic generator (5) and an anode (3) and a cathode (4) that are connected with the electrostatic generator (5); and the sewage treatment reactor is arranged between the anode (3) and the cathode (4). The inventive device is based on conventional activated sludge process, adds an electrostatic field device in a biochemical reaction tank to form high-voltage electric field radiation effect, so as to activate the biological activity of microorganisms and improve the activated sludge oxygen consumption rate, thereby improving sewage treatment efficiency.

Description

Use the device that electrostatic field improves active sludge oxygen-consuming rate

Technical field

The present invention relates to a kind of device that electrostatic field improves active sludge oxygen-consuming rate of using, belong to technical field of sewage.

Background technology

Traditional activated sludge method processing technique is still just generally adopted in current domestic sewage disposal, particularly sanitary sewage disposal field.Activated sludge process has the processing efficiency height, and it is big to handle the water yield, and operational management advantage comparatively easily.By different sewage treatment process, mainly be to remove COD organism such as (chemical oxygen demand (COD)) in the water, and the purpose of denitrogenation dephosphorizing.Along with industrial expansion, the raising of living standards of the people, the content of nutritive element in municipal effluent such as nitrogen phosphorus are increasing, new sewage drainage standard, primary standard A requires the water outlet ammonia nitrogen at 5-8mg/l, and therefore total nitrogen 15mg/l has proposed requirements at the higher level to denitrogenation.

Original SBR (intermittently sequence batch (reaction unit), nitric efficiency is low, often needs long aeration time to finish the nitrifying process of ammonia nitrogen, exists energy consumption big like this, and the defective of the inefficiency of disposing of sewage has increased processing cost and actual motion expense.Because it is nitrated incomplete causing a low major cause of nitric efficiency, and causes a nitrated incomplete deficiency that factor is an aeration time, but prolonging aeration time has often increased energy consumption, has improved the cost of sewage disposal, has increased working cost.The existence of these contradictions is exactly the major cause that nitric efficiency is difficult to improve.

Summary of the invention

The objective of the invention is to overcome the above-mentioned defective of existing waste disposal plant, a kind of device that electrostatic field improves active sludge oxygen-consuming rate of using is provided.This device has improved the operational efficiency of reactor by the effective activating microorganisms activity of electrostatic field, especially has unusual effect on aerobic nitrification speed.

To achieve these goals, the present invention has taked following technical scheme.This device includes sewage-treating reactor and electrostatic field generating unit.The electrostatic field generating unit includes electrostatic power unit and the anode that is connected with electrostatic power unit, negative electrode, and sewage-treating reactor is placed between anode and the negative electrode.

Described anode 3 and negative electrode 4 are metal electrode board, and the two is parallel over against placement.

The principle of work of apparatus of the present invention: at first, active sludge oxygen-consuming rate is meant in the unit time that active sludge microorganism is to the consumption of dissolved oxygen in the mixed solution.The active sludge aerobic speed response biodegradability of mud, the speed of the mud oxygen consumed that biodegradability is high is fast, microorganism active is strong.The wear rate of dissolved oxygen is accelerated to have shown in the unit time and is accelerated to the degradation rate of COD (chemical oxygen demand (COD)) with to the rate of nitrification of ammonia nitrogen in the water.Radiation effect by the high tension electrostatic field, can make active sludge microorganism produce activating effect, within the specific limits can activating enzymes, its mechanism electric field has excited the more avtive spot of enzyme or increased the existing active sites of enzyme lights the scope of katalysis, thereby accelerated microorganism RNA (Yeast Nucleic Acid) and proteinic resultant velocity, changed the genetic expression of microorganism; Electric field action has also changed the ionic concn of microorganism cells both sides in the active sludge simultaneously, membrane potential is changed, thereby improved the permeability of film, has accelerated the exchange of material, promotes the vital movement of microorganism.

Under the condition of the normal operation of reactor, produce the high tension electrostatic field between negative electrode and the anode, the active sludge of the effect of irradiation of electrostatic field in reactor assembly activated microbic activity in the active sludge, improved the oxygen consumption rate of mud, nitrification significantly improves.High tension electrostatic field generating unit and sewage-treating reactor move simultaneously, and the high pressure static electricity field voltage is higher, and electric current is very little, and watt consumption is lower, so energy consumption is low.

Description of drawings

The original SBR of Fig. 1 sends out and answers device

Fig. 2 apparatus of the present invention synoptic diagram

Among the figure: 1, sewage-treating reactor, 2, liquid level, 3, anode, 4, negative electrode, 5, electrostatic power unit, 6, ground connection.

Embodiment

Describe present embodiment in detail below in conjunction with accompanying drawing.

As shown in Figure 2, at sewage-treating reactor fitted around high tension electrostatic field generating unit, the high tension electrostatic field generating unit includes negative electrode 3, anode 4 and HV generator in the present embodiment.At negative electrode 3 and the anode 4 middle sewage-treating reactors of placing.What the sewage-treating reactor in the present embodiment was selected for use is the sbr reactor device, what anode and negative electrode adopted is steel plate galvanized, cathode electrode plate links to each other with electrostatic generator over against placement and by supply lead with anode electrode plate, what HV generator adopted is continuous adjustable negative high voltage out-put supply (JO-G type), therefore anode metal plate adopts grounding wire, because of the earth electrode potential is zero, and the cathodic metal plate is connected with electrostatic power unit by supply lead, constitutes the field intensity direction by the high-voltage electric field radiation of anode 3 to negative electrode 4.Under the condition of the normal operation of reactor, produce the high tension electrostatic field between negative electrode and the anode, operation sbr reactor device under the electric field radiation effect.

The useful volume of sbr reactor device is 12L in this device, and material is a glass.Can change dissimilar reaction units according to actual needs.Metal anode and cathode electrode plate, what adopt is steel plate galvanized, link to each other with electrostatic generator by supply lead, what electrostatic power unit adopted is continuous adjustable negative high voltage out-put supply (JO-G type), therefore anode metal plate adopts grounding wire, with the earth electrode potential is zero, constitutes the field intensity direction by 3 to 4 high-voltage electric field radiation.

The working process of this device is: a cover reaction unit is placed in the high pressure static electricity field-effect environment, and this reactor is called experimental group; The reactor of another set of no high voltage electrostatic field is called control group.At first adopt the active sludge in the A/O technology aeration tank to inoculate, make that activated sludge concentration reaches about 2000mg/l in the reactor, experimental water is taken from certain community life sewage, water inlet COD:280～350mg/l, ammonia nitrogen 70～100mg/l; Open experimental group and control group SBR equipment simultaneously, adopted each cycle aeration 4 hours, aeration rate is 0.9L/min～1.5L/min, dissolved oxygen is controlled at 1.5mg/L～2.5mg/L in the reaction process, quiet heavy 0.5 hour, draining and idle 1.5 hours, the operational mode in 4 cycles of every day.Under the situation that organic concentration is identical with operational conditionss such as aeration rates in reactor, COD, ammonia nitrogen concentration and oxygen consumption rate (OUR) are measured in the 1st, 2,3,4 hour end at run duration experimental group and each cycle aeration of control group, and study their Changing Pattern.

Experimental results show that this device improves 14%～32% than control group active sludge oxygen-consuming rate mean value; Experimental group COD average removal rate is 90.2%, and control group is 84.4%; The nitrated data presentation of ammonia nitrogen, when aeration finished in 4 hours, experimental group water outlet ammonia nitrogen was 9.89mg/l, and ammonia nitrogen removal frank reaches 86.96%, and the control group ammonia nitrogen is 16.26mg/l, and ammonia nitrogen removal frank is 78.5%.This device has significantly improved the oxygen consumption rate of mud, the rate of nitrification of ammonia nitrogen and COD clearance.

Claims

1, uses the device that electrostatic field improves active sludge oxygen-consuming rate, include sewage-treating reactor; It is characterized in that: also include the electrostatic field generating unit, described electrostatic field generating unit includes electrostatic power unit (5) and the anode (3) that is connected with electrostatic power unit (5), negative electrode (4), and sewage-treating reactor is placed between anode (3) and the negative electrode (4).

2, application electrostatic field according to claim 1 improves the device of active sludge oxygen-consuming rate, and it is characterized in that: described anode (3) and negative electrode (4) are metal electrode board, and the two is parallel over against placement.