CN102838202A

CN102838202A - Sewage treatment method

Info

Publication number: CN102838202A
Application number: CN2012103541823A
Authority: CN
Inventors: 刘康怀; 龙飞; 史奇峰; 张庆军
Original assignee: Guilin University of Technology
Current assignee: Guilin University of Technology
Priority date: 2012-09-21
Filing date: 2012-09-21
Publication date: 2012-12-26

Abstract

The invention discloses a sewage treatment method. According to the method, a sewage treatment device is arranged and comprises a reactor, a peristaltic pump, an air pump and an effluent collection pipe, wherein the reactor comprises a non-woven cloth dynamic membrane component and a biological reaction unit; the non-woven cloth dynamic membrane component is of a hollow structure; an inner cavity of the non-woven cloth dynamic membrane component is supported by stainless steel metal and a filter surface which is formed by wrapping non-woven cloth is arranged at the outer layer; and after a circulating flow process in the reactor, a part of sewage penetrates through the filter surface to enter the hollow cavity in the non-woven cloth dynamic membrane component and flow out of the reactor through the effluent collection pipe. According to the method, a low-cost non-woven cloth material is used for replacing the conventional membrane material, so that the construction cost of the membrane component and the operation expense of membrane change in the conventional process are reduced, and the method has the advantages of being good in mud-water separation effect, little in residual sludge discharge and the like.

Description

A kind of sewage water treatment method

Technical field

Technical field is a field of environment engineering under the present invention, particularly a kind of sewage water treatment method.

Background technology

At present, the shortage of city water resource is restricting expanding economy, and the secondary effluent of municipal sewage plant is carried out advanced treatment and regeneration is an effective way that solves shortage of water resources; The second-stage treatment method of municipal effluent mainly is a biological process, comprises activated sludge process and biomembrance process, and the technology that activated sludge process generally adopts has SBR technology, CAST technology, adsorption biodegradation and oxidation ditch process etc.; Biomembrance process commonly used mainly contains biological filter process, bio-disc system, biological contact oxidation process and biological fluidized bed method etc.; These methods can obtain good scrubbing effect when disposing of sewage, but the shortcoming that also exists some to be difficult to overcome, as: capital construction and working cost are high, the sludge bulking problem generally takes place, excess sludge treatment and disposal difficulty is big etc.

The investment cost of membrane separation technique is higher than the expense of traditional biological treatment technology in the WWT; Can know based on film pollution correlation theory and mechanism; Should select the particle of filming of appropriate particle size according to the situation of membrane pore size and feed liquid particle, in the hope of obtaining effect preferably; Particle diameter is too small, and then fenestra stops up, and is difficult for cleaning; Particle diameter is excessive, then holds back weak effect; In addition, Dynamic Membrane is trapped formation because of physics, chemistry or mechanical effect, and its film forming bonding force also is a problem that should be noted that; Bonding force is too strong, then is unfavorable for the Dynamic Membrane renewal; Bonding force too a little less than, then be unfavorable for the stable of Dynamic Membrane.

Non-woven fabrics spins in aspects such as material, structure, aftertreatment and heat setting type and traditional having and is furnished with very big difference; Its main raw material(s) is a Vestolen PP 7052; Be environment-friendly materials of new generation; Have protection against the tide, ventilative, pliable and tough, light weight, not combustion-supporting, easy decomposition, nontoxic nonirritant, rich color, cheaply, capable of circulation use again, water-repellancy; Characteristic such as not mouldy, and can isolate the erosion that has bacterium and mikrobe in the liquid; Does not wait at 1-500 μ m in the aperture of non-woven fabrics, the filtration medium of small-particle in can serving as; Its making processes has characteristics such as flow process is short, output is high, cost is low, raw material sources are many; Because non-woven fabrics shows superior strainability and less cost, increasing being used in the filtration process.

Expensive in order to overcome, be prone to problem such as pollutions, the employing non-woven fabrics does not appear in the newspapers as the thinking that dynamic film component and aerobe reactor combine.

Summary of the invention

The purpose of this invention is to provide a kind of sewage water treatment method, this method need adopt non-woven fabrics Dynamic Membrane and aerobe reactor to combine the waste disposal plant of being developed to carry out by a kind of.

Concrete steps are:

(1) a kind of waste disposal plant is set, comprises reactor drum, peristaltic pump, air pump and go out water collection pipe, wherein reactor drum comprises non-woven fabrics dynamic film component and biological respinse unit; The non-woven fabrics dynamic film component is a hollow structure; Inner chamber is to be supported by stainless steel metal, and skin is wrapped to form filtering surface by non-woven fabrics, and reactor bottom is provided with aeration head; Peristaltic pump is connected with reactor bottom through flexible pipe; Air pump is connected with the aerating apparatus of reactor bottom through pipeline, and a gas meter is installed on the pipeline between air pump and the aeration head, and an end that goes out water collection pipe connects the inner chamber of non-woven fabrics dynamic film component; The other end places reactor drum outside, goes out water collection pipe and is provided with valve.

(2) sewage is introduced the described waste disposal plant of step (1); Sewage gets into reactor bottom through the flexible pipe of peristaltic pump, and reactor bottom is provided with the aeration head that is evenly distributed, and air pump carries out the bottom aeration process to the aeration head gas transmission; Thereby to the sewage oxygen supply; And promote sewage and in reactor drum, form and circulate, keeping the complete admixture in the reactor drum, and in the top-down face cross-flow of the intermediate formation of reactor drum; As time goes on, mud accumulation degree increases the weight of on the non-woven fabrics dynamic film component, and membrane flux reduces, and filter pressure increases, and liquid level rises thereupon; After pressure reduction acquired a certain degree, the rete aperture was penetrated, and membrane flux increases; Reach an equilibrium state so repeatedly at last, form Dynamic Membrane; Sewage through in reactor drum circulate process after, wherein a part penetrates filtering surface and gets into the cavity in the non-woven fabrics dynamic film component, and through going out the water collection pipe outflow reactor.

The aeration rate scope of said aeration head is 1.5 ~ 2 cubic metres/hour, and aeration head provides stronger air-water polyphasic flow, washes away through intensive air water in the short period of time, with the controlling diaphragm pollution level.

Different with traditional TP, the present invention adopts non-woven fabrics Dynamic Membrane and aerobe reactor to combine the novel sewage treatment unit of being developed to carry out, have following advantage by a kind of:

(1) mud-water separation of the present invention is effective, and the quantity discharged of excess sludge is few;

(2) the present invention adopts cheap nonwoven cloth material to replace the conventional film material, the working cost that membrane module cost and film are changed in the reduction traditional technology, thus improve the benefit of WWT, reduce the cost of WWT, easy to utilize;

(3) apparatus structure used in the present invention is simple, is easy to safeguard, and is simple to operate.

Description of drawings

Fig. 1 is that waste disposal plant used herein connects synoptic diagram.

Mark among the figure: 1-peristaltic pump; The 2-air pump; The 3-reactor drum; 4-non-woven fabrics dynamic film component; The 5-aeration head; The 6-valve; The 7-gas meter.

Fig. 2 is the test initial stage goes out the water outlet of water collection pipe institute among the embodiment a turbidity variation diagram in time.

Fig. 3 is the volumetric loading tested among the embodiment figure that influences to the COD of system removal effect.

Fig. 4 is the sludge loading tested among the embodiment figure that influences to the COD of system removal effect.

Fig. 5 is the hydraulic detention time tested among the embodiment and the graph of a relation of COD clearance.

Embodiment

Embodiment:

The volume of said reactor drum is 50 liters, and said non-woven fabrics dynamic film component is made by stainless steel frame, non-woven fabrics, and the filter membrane sheet is that the non-woven fabrics of 50 μ m is wrapped to form by the aperture, and inner chamber is by steel frame support, and is not yielding; The effective filtration area of every film is 0.1m ², totally 4 non-woven fabrics filter membrane sheets, nested being fixed in the stainless steel frame places the reactor drum middle part, to prevent that membrane module from receiving aeration and washing away and be subjected to displacement.

The aeration rate scope of said aeration head is 1.5 cubic metres/hour, and aeration head provides stronger air-water polyphasic flow, washes away through intensive air water in the short period of time, with the controlling diaphragm pollution level.

Said sewage adopts glucose, peptone, ammonium chloride, potassium primary phosphate, sal epsom, calcium chloride, sodium hydrogencarbonate etc. to be mixed with, and main nutrition composition is configured (seeing table 1) according to the ratio of COD:N:P:Fe=100:5:1:0.1.

The composition of table 1 human configuration sewage

Composition	Concentration (mg/L)	Composition	Concentration (mg/L)
				Glucose	556	FeSO ₄	0.3
Peptone	28	CaCl ₂	6
				KH ₂PO ₄	52.8	(NH ₂) ₂CO ₃	167
MgSO ₄	66	NaHCO ₃	111
				MnSO ₄7H ₂O	6	?	?

The treatment effect of NW-DMBR under the different hydraulic detention times of table 2

Hydraulic detention time/(h)	Water inlet COD/ (mg/L)	Supernatant C OD/ (mg/L)	The water outlet COD/ of system (mg/L)	COD supernatant clearance	COD system clearance	Volume is removed load/(kgCOD/m ³·d）
							8	467	47	28	90%	94%	1.317
6	454	45	32	90%	93%	1.687
							5	479	57	43	88%	91%	2.092
4.5	489	73	59	85%	88%	2.293
							4	450	77	54	83%	88%	2.376
3	478	100	72	79%	85%	3.024

The influence that table 3 DO removes COD

The influence that table 4 pH value is removed COD

Table 2,3,4 is the testing data table of present embodiment, can be known by the data of above three tables, and the device of present embodiment is 5 hours at hydraulic detention time (HRT); Dissolved oxygen (DO) concentration is under the operational conditions of 2 mg/litre; The delivery turbidity of NW-DMBR device is 5NTU, and the suspended substance in the water quality (SS) clearance is more than 99.5%, and the average water inlet total organic carbon (TOC) of system is 181mg/L; Average water outlet total organic carbon (TOC) is 15mg/L; Supernatant total organic carbon (TOC) average removal rate is 88.7%, and system is 91.9% to the average removal rate of total organic carbon (TOC), and Dynamic Membrane is 3.2% to the clearance of total organic carbon (TOC); Reactor drum is 93.4% to the average removal rate of ammonia nitrogen, and ammonia nitrogen is on average removed load and is 0.16kg/m ³D, NW-DMBR is 63.5% to the average removal rate of total phosphorus.

Claims

1. sewage water treatment method is characterized in that concrete steps are:

(1) a kind of waste disposal plant is set, comprises reactor drum, peristaltic pump, air pump and go out water collection pipe, wherein reactor drum comprises non-woven fabrics dynamic film component and biological respinse unit; The non-woven fabrics dynamic film component is a hollow structure; Inner chamber is to be supported by stainless steel metal, and skin is wrapped to form filtering surface by non-woven fabrics, and reactor bottom is provided with aeration head; Peristaltic pump is connected with reactor bottom through flexible pipe; Air pump is connected with the aerating apparatus of reactor bottom through pipeline, and a gas meter is installed on the pipeline between air pump and the aeration head, and an end that goes out water collection pipe connects the inner chamber of non-woven fabrics dynamic film component; The other end places reactor drum outside, goes out water collection pipe and is provided with valve;

(2) sewage is introduced the described waste disposal plant of step (1); Sewage gets into reactor bottom through the flexible pipe of peristaltic pump, and reactor bottom is provided with the aeration head that is evenly distributed, and air pump carries out the bottom aeration process to the aeration head gas transmission; Thereby to the sewage oxygen supply; And promote sewage and in reactor drum, form and circulate, keeping the complete admixture in the reactor drum, and in the top-down face cross-flow of the intermediate formation of reactor drum; As time goes on, mud accumulation degree increases the weight of on the non-woven fabrics dynamic film component, and membrane flux reduces, and filter pressure increases, and liquid level rises thereupon; After pressure reduction acquired a certain degree, the rete aperture was penetrated, and membrane flux increases; Reach an equilibrium state so repeatedly at last, form Dynamic Membrane; Sewage through in reactor drum circulate process after, wherein a part penetrates filtering surface and gets into the cavity in the non-woven fabrics dynamic film component, and through going out the water collection pipe outflow reactor;