CN101746887B

CN101746887B - Compounded decoupling agent

Info

Publication number: CN101746887B
Application number: CN2008102074610A
Authority: CN
Inventors: 仓一华; 姜垒垒; 吴敏; 赵海云; 常莉英
Original assignee: Sinopec Shanghai Petrochemical Co Ltd
Current assignee: Sinopec Shanghai Petrochemical Co Ltd
Priority date: 2008-12-19
Filing date: 2008-12-19
Publication date: 2011-06-15
Anticipated expiration: 2028-12-19
Also published as: CN101746887A

Abstract

The invention provides a compounded decoupling agent, which is used for performing reduction treatment on excess sludge in an aerobic sewage treatment process through an activated sludge method. The compounded decoupling agent comprises the components of 3,3,4,5-tetrachlorosalicylamide and zeolite powder in a weight ratio of the 3,3,4,5-tetrachlorosalicylamide to the zeolite powder of 1:(0.1-1.5). The compounded decoupling agent provided by the invention can obviously reduce the attenuation on the activity of sludge while keeping good sludge reduction performance, and has a very obvious positive effect and stronger performance embodied in the sludge reduction; by adopting the compounded decoupling agent, the added TCS can be reduced by 20 to 60 percent to achieve the same sludge reduction rate; and when the TCS is added into a system, the COD removal rate is basically not affected.

Description

A kind of composite uncoupling agents

Technical field

The present invention relates to a kind of uncoupling agents, particularly be used for active sludge aerobic sewage treatment excess sludge reduction and handle, and main component is 3,3,4, the uncoupling agents of 5-tetrachloro salicylic amide.

Background technology

Activated sludge process is present most widely used sewage (comprising a municipal effluent or industrial sewage) biologic treating technique, though this Technology has a lot of advantages, few as initial cost, treatment effect is good, stable etc., but also there is a significant disadvantage in it, promptly can produce a large amount of excess sludges in operational process.The processing cost of excess sludge is quite high, generally can account for 25%～65% of Sewage Plant operation total expenses, and therefore, the production rate that activated sludge sewage disposal process reduces or reduce excess sludge is the problem of being paid close attention to very much always.Existing commonly used mud decrement technology comprises that mainly extended aeration process, pure-oxygen aeration method, microorganism predation method, aerobic or anaerobic digestion conciliate coupling method etc., although these methods all exist tangible advantage and deficiency separately, but comparatively speaking, wherein the uncoupling method is accepted because of the maximum more people of the amplitude that reduces sludge yield and is had more development prospect.

In activated sludge process, microorganism is pollutent to be removed from waste water as the carbon source and the energy of growth with pollutants in waste water matter (matrix), obviously microorganism growth is relevant with the matrix utilization, and the synthetic energy that also needs to be coupled with it of microorganism to be to form new cell, and this energy is mainly provided by Triphosaden (ATP).ATP then mainly is that oxidation and the phosphorylation by adenosine diphosphate (ADP) (ADP) generates in the microbiological degradation metabolic process, under the normal circumstances, oxidizing reaction and phosphorylation reaction are link coupled, and promptly microorganism changes into simultaneous ADP in the process of pollution substance oxidation the phosphorylation process of ATP.The uncoupling method is to add chemical agent-uncoupling agents in system, makes the coupling relation broken that exists between oxidation and the phosphorylation, suppresses the carrying out of the phosphorylation reaction of generation ATP, thereby makes the microorganism anabolism reduce the purpose that reduces the microorganism productive rate to reach.

Uncoupling agents commonly used in the prior art has 2,2, 4-dinitrophenol, Trichlorophenol, 2,4 dichloro phenol and 3,3,4,5-tetrachloro salicylic amide (TCS) etc.Wherein TCS significantly uses the most extensive because of the decrement effect to excess sludge, in some active sludge treatment process, the multipotency of the output of mud reduces 40%, " Utilization of a metabolicuncoupler 3 for example, 3 ', 4 ', 5-tetrachlosalicylanilide (TCS) to reduce sludge growth in activated sludgeculture " (Water Res, 2002,36 (8): 2077-2083) introduced in the literary composition.Although all uncoupling agentss all have a common shortcoming, can make the activity of mud reduce after the i.e. adding system, yet this shortcoming of TCS is more remarkable, " killing and wounding " effect to microorganism is bigger relatively, and this perhaps is that TCS can't thoroughly replace one of main reason of other uncoupling agents.

Summary of the invention

The invention provides a kind of composite uncoupling agents, it is with 3,3,4,5-tetrachloro salicylic amide (TCS) is a main component, behind the auxiliary component that adds other, can solve effectively that the adding because of TCS causes sludge activity to reduce this technical problem in the Sewage treatment systems.

Below be the technical scheme that the present invention solves the problems of the technologies described above:

A kind of composite uncoupling agents is used for the decrement treatment of the aerobic sewage treatment process excess sludge of activated sludge process, and its component comprises 3,3,4,5-tetrachloro salicylic amide and zeolite powder, 3,3,4, the weight ratio of 5-tetrachloro salicylic amide and zeolite powder is 1: (0.1～1.5).

Above-mentioned 3,3,4, the weight ratio of 5-tetrachloro salicylic amide and zeolite powder is preferably 1: (0.2～0.8). The granularity of zeolite powder is generally got 40～100 orders.

In the activated sludge process Sewage treatment systems, sewage and mud are not to be in the homogeneous admixture each other, although there is the mechanical agitation of aeration, mud serves as main being suspended in the system with micelle particulate form still.The contriver finds that in experiment TCS is very relevant in the concentration of aqueous phase with TCS to " killing and wounding " effect of microorganism, and concentration higher " killing and wounding " effect is bigger.The uncoupling of TCS is then very relevant with the concentration of TCS in mud micelle particle, and concentration heals high uncoupling more greatly.

Essence of the present invention is that TCS and zeolite powder are hybridly prepared into a kind of compound uncoupling agents according to a certain percentage, the contriver observes in experiment, because zeolite powder has bigger porosity and specific surface, TCS is not only had stronger adsorption, and loading capacity is very big.When TCS with after zeolite powder mixes according to a certain percentage, zeolite powder is as the carrier TCS that adsorbed load, form the compound uncoupling agent of a kind of " loading type ", and be carried on the TCS meeting rapid " dissolving " in water and unlike simple TCS on " carrier ", and slowly discharge with relatively low speed, therefore the compound uncoupling agent of this " loading type " can be regarded as " slowly-releasing " TCS.The contriver finds by further experiment, compares with simple TCS, and the dissolution rate at sewage behind the TCS of this " loading type " input coefficient obviously slows down, and therefore the concentration at the sewage aqueous phase greatly reduces.On the other hand, gather fusedly because the zeolite powder particle is very easy with mud micelle particle, both gather fused back TCS and will discharge lentamente in " dissolving in " mud micelle, make can obtain higher TCS concentration in the mud micelle.

The mechanism that more than to be exactly compound TCS uncoupling agents provided by the invention can obviously reduce when keeping good mud decrement performance to the abated effect of sludge activity.Positively effect compared with prior art of the present invention is fairly obvious, is embodied in following 2 points:

1) performance of mud decrement is stronger, as reaches same mud decrement rate, and the TCS that adds can reduce 20～60%;

2) add TCS in the system after, the COD clearance is unaffected substantially.

To come below that the present invention is further illustrated by specific embodiment, in an embodiment, the mud decrement rate is defined as:

Wherein, sludge yield I is the device unit sludge yield that does not add uncoupling agents in the system, and sludge yield II is the device unit sludge yield that adds in the system behind the uncoupling agents.

Embodiment

[embodiment 1～8]

Each embodiment uncoupling agents is prepared in required ratio, and getting granularity is 40～100 purpose zeolite powders, and the weight ratio of TCS and zeolite powder sees Table 1.

Table 1.

	TCS/ zeolite powder (weight ratio)
		Embodiment 1	1/0.1
Embodiment 2	1/0.2
		Embodiment 3	1/0.4
Embodiment 4	1/0.6
		Embodiment 5	1/0.8
Embodiment 6	1/1.0
		Embodiment 7	1/1.2
Embodiment 8	1/1.5

The uncoupling agents of the various embodiments described above preparation adopts following method to carry out experimental test:

The sewage of test is oil refining sewerage, and handles through oil removal, coagulation flotation, and the water quality of water inlet is:

COD 575mg/l

PH value 8.2

Sewage adopts sequencing batch active sludge (SBR technology) to handle, and reactor volume is 8m ³, the processing condition of operation are:

The about 0.9kgBOD of sludge loading ₅/ (kgMLVSSd)

20～30 ℃ of temperature of reaction

Dissolved oxygen 2～4mg/l

The uncoupling agents dosage sees Table 2 in the sewage

(in TCS)

Above-mentioned uncoupling agents is stirred to formation suspension with service water earlier, and compound concentration is 2～4g/l, adds with water inlet then.

Experimental test the results are shown in Table 2, and wherein comparative example is for adding TCS merely, and all the other test conditionss are with embodiment 1～8.

Table 2.

	Uncoupling agents dosage (in TCS) (mg/l)	COD clearance (%)	Mud decrement rate (%)
				Embodiment 1	3.6	35.9	42.7
Embodiment 2	3.3	40.5	43.6
				Embodiment 3	2.9	47.6	44.3

Embodiment 4	2.5	46.9	44.7
				Embodiment 5	2.2	44.3	43.8
Embodiment 6	2.0	38.9	41.2
				Embodiment 7	1.8	40.2	39.8
Embodiment 8	1.6	40.3	39.3
				Comparative example	4	25.2	39.6

Claims

1. composite uncoupling agents is used for the decrement treatment of the aerobic sewage treatment process excess sludge of activated sludge process, and its component comprises 3,3,4,5-tetrachloro salicylic amide and zeolite powder, 3,3,4, the weight ratio of 5-tetrachloro salicylic amide and zeolite powder is 1: (0.1～1.5).

2. uncoupling agents according to claim 1 is characterized in that describedly 3,3,4, and the weight ratio of 5-tetrachloro salicylic amide and zeolite powder is 1: (0.2～0.8).

3. uncoupling agents according to claim 1, the granularity that it is characterized in that described zeolite powder is 40～100 orders.