CN1590314A

CN1590314A - Coarse net filtering biological reactor

Info

Publication number: CN1590314A
Application number: CNA031437451A
Authority: CN
Inventors: 魏勇莉
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-08-04
Filing date: 2003-08-04
Publication date: 2005-03-09

Abstract

A bioreactor with a strainer unit for treating sewage features that said strainer unit is put in the bioreactor of sewage in such manner that the liquid level is higher than the top of said strainer unit and the water outlet of bioreactor. Under existance of crossflow, a filter cake with filtering power is generated on its surface for filtering the sewage. When the thickness of filter cake reaches a certain value, it is flushed out.

Description

The coarse net filtering bio-reactor

One, technical field

This technology is used for life, industrial sewage is handled and water treatment is given in little pollution.

Two, background technology

(1), traditional water technology

Traditional biochemical water treatment is a water technology of realizing the solid-liquid separation of sewage with secondary sedimentation basins and sand filter.The advantage that this method has is that technology is simple, the operation comparative maturity.But subject matter is:

1, area is big, and working cost is higher.

2, mud-water separation is finished by action of gravity in second pond in the activated sludge process that adopts usually, its separation efficiency depends on the active sludge settling character, this characteristic must strictly be controlled aeration tank operational condition and operation conditions, and this has limited the operating range of this method.

3, owing to the requirement of second pond solid-liquid separation, the mud of aeration tank can not be kept higher concentration, generally at 2-4g/L, thereby has limited the biochemical reaction rate.

4, hydraulic detention time (HRT) interdepends with sludge age (SRT), improves volumetric loading and reduces sludge loading formation contradiction.System produces a large amount of excess sludges in operational process, its processing costs accounts for the 25%-40% of sewage work's expense.

5, solid-liquid separation is poor, is prone to sludge bulking, contains suspended solids in the water outlet, and effluent quality is poor, N-NH ₃Clearance is low.

(2), film-bioreactor (Membrane Bioreactor, MBR)

The work principle of filter of film-bioreactor is to combine biological organic biochemical degradation to be made to have filteration with membrane module.Film in the membrane bioreactor adopts microfiltration membrane (aperture is 5-100nm) and ultra-filtration membrane (aperture is 0.05-5 μ m) to filter the second pond that replaces in the traditional technology usually, this water technology by film reinforcement biochemical reaction has solved the outstanding problem that traditional activated sludge process exists basically, yet, MBR promotes still undesirable, and subject matter is:

1, mould material, the membrane module of the normal film-bioreactor that adopts are also very limited, and involve great expense, and cause the investment of MBR technology higher.

2, occur film easily and pollute, and be difficult to control, film is short work-ing life, and operational administrative inconvenience improves working cost.

3, usually need water outlet under the pressurization of pump or puffing regimens, operation energy consumption is higher.

4, the processing power of unit membrane is little, permeability rate is lower.

(3), bioreactor of dynamic membrane (Dynamic Membrane Bioreactor)

The method of " use bioreactor of dynamic membrane mixed solution filter ": its principle is to be that base material is processed into filter assemblies with common porous material, put it in the bio-reactor with the water of being back to back and make it to flood, make the reactor liquid level be higher than water outlet, form waterhead, under situation with face cross-flow, carry out along with filtering, microbial metabolites and bacteriums itself etc. can be at substrate surface by absorption, adhere to, precipitations etc. form the biomass layer, this tunic possesses and is similar to the fixedly filtration capacity of film, under suitable condition, Dynamic Membrane can reach with conventional film and filter identical filter effect.But also there are some problems:

1. the formation of Dynamic Membrane and filtering feature are subjected to all multifactor influences, such as: the material that porous supports, filter pressure, the formation of Dynamic Membrane, concentration colloidal solid size, the pH value of solution, ionic strength, filter pressure, Dynamic Membrane forms the look time etc.

2. because Dynamic Membrane is to form in the original place, therefore support film is easily polluted, at the contaminated back of film difficult drop-off, cause porous supporting body short work-ing life, although on the Dynamic Membrane principle be with porous material (as: wide-aperture material such as wire netting, vitrified pipe, dull and stereotyped woven) for supporter, quite a few investment cost, film update cost are higher relatively.

3. because also there is membrane pollution problem in Dynamic Membrane, cause flux to descend, the effluent quality instability is difficult to many deficiencies such as operational administrative, and therefore, Dynamic Membrane does not also have industrial applications at present.

Three, summary of the invention

" coarse net filtering biological clarification " is on the basis of traditional activated sludge process, at MBR technology and dynamic membrane filtering technical problem, the coarse net filtering biological clarification is applied to wastewater treatment, its major technique is to propose on the basis of the mud cake characteristic of active sludge when low pressure reduction, it is to be that base material is processed into filter assemblies with the coarse net material, it is inserted in the wastewater biological reactor, form the mud cake that one deck has filtration capacity on its surface, filter with mud cake.Dispose rinse-system simultaneously, when mud cake thickens certain thickness, by tackling system filter assemblies is left the water and to clean, mud cake is peeled off from base material, insert again then in the water, form new mud cake and filter again by cleaning system.Prior biological reactor parameter synopsis:

Project	????MBR	The Dynamic Membrane reactor	Coarse mesh filter
Project	????MBR	The Dynamic Membrane reactor	Coarse mesh filter	Effluent quality	Excellent	Difference	Excellent
Effluent flux	????10L/h.m ²	????20L/h.m ²	????200L/h.m ²	Effluent quality	Excellent	Difference	Excellent
Effluent flux	????10L/h.m ²	????20L/h.m ²	????200L/h.m ²	Fixed investment	High	Low	Minimum
Pollution condition	Have	Have	Do not have	Fixed investment	High	Low	Minimum
Pollution condition	Have	Have	Do not have	Operation process	Simply	Simply	Complicated

Four, description of drawings:

Accompanying drawing 1 is coarse net filtering bioreactor device figure

Accompanying drawing 2 is coarse net filtering bio-reactor functional block diagrams

Five, embodiment

(1), filter assemblies

1. assembly material

(1), filtration medium adopts the bigger material of aperture ratio.

(2), the filtration medium supporting layer is selected the stainless steel woven wire for use

2. unit construction

(1), the inner chamber width of assembly is 2cm

(2) so, the big 10cm of adjacent component width between centers

(3), component size is with 200L/h.m ²Design filtration area

(2), tackling system

Select the electric hoist complete operation of 5m/min pulling speed for use, when liquid level arrival was provided with height, lifting machine started; When assembly rose the arrival cleaning system, cleaning system started.When being applied to multicompartment, lifting machine need move to corresponding position, rises and transfers different assemblies.

(3), cleaning system

The pressure of scavenging pump is selected 4kgf/cm for use ², wash tube adopts the microporous pipe of 1mm, and the spacing in every hole is 2cm, and rinse water is selected the reactor water outlet for use.

(4), water inlet system

Employing constant current water inlet is controlled by liquidometer.

(5), aerating system

Aeration tube adopts boring aeration.

Aeration mode adopts the side aeration.

(6), reactor parameter

The sludge concentration of reactor should be controlled between the 3.5g/L-8g/L, and hydraulic detention time is 4-6 hour.

(7), electrical control system

Adopt PLC control water level gauge, lifting machine, rinse-system.

Claims

Technical characterictic of the present invention:

1, filtration pressure difference is low, the resistance of P mud cake＜1cm water column.

2, filtration flux is 200L/m ²H, be 8 hours corresponding filtration cycle.

3, peeling off of mud cake is to peel off by high pressure water washing, and flushing pressure is 4kgf/cm ²

4, as filtration medium, contamination resistance is far longer than microfiltration membrane and ultra-filtration membrane to the bigger base material (100 μ m) of its employing aperture ratio, adds high pressure washing, and it does not have contamination phenomenon.

Claimed scope:

1. it adopts the bigger base material of aperture ratio as filtration medium.

2. peeling off of mud cake is to peel off by high pressure water washing.