CN105417902A - Continuous-elutriating-type sludge digestion system - Google Patents

Abstract

The invention discloses a continuous-elutriating-type sludge digestion system. Anaerobic digestion of sludge is carried out in a solid-phase reaction tank and a liquid-phase reaction tank. A hydrolysis reaction is mainly carried out in the solid-phase reaction tank, a gas production reaction is mainly carried out in the liquid-phase reaction tank, hydrolysis products in a hydrolysis tank are elutriated through water discharged from a gas production tank, and the elutriated hydrolysis products enter the air production tank to form circulation. As a result, the solid phase and the liquid phase of the sludge are both under the optimal reaction conditions, and meanwhile as the solid phase (sludge particulates) is repeatedly hydrolyzed, the sludge reduction effect of the technology is good.

Description

Continuous elutriation sludge digestion system

technical field

The invention relates to a sludge digestion system, in particular to an elutriation type sludge digestion system.

Background technique

At present, my country's sludge production is huge, and sludge disposal has become a national problem. Although there are many technological routes for sludge disposal, all of them have defects such as high cost and large secondary pollution. According to the three principles of sludge disposal: reduction, harmlessness and recycling, reduction is the first link to be carried out, and sludge digestion is an effective means of reduction.

Sludge digestion is an ancient process that can reduce the organic matter in sludge by 30-40%. The reason why this technology is not widely used in sludge disposal is mainly because of two points: first, the reduction rate is not enough, Second, it is difficult to dehydrate the digested sludge so that the final disposal cost does not reduce much. If the sludge digestion process is improved to increase the reduction rate of organic matter (for example, to 70-80%), it will bring very beneficial effects: First, more sludge is reduced The second is that due to the removal of a large amount of organic matter, the degree of inorganicization of sludge will be greatly improved, and the increase in the degree of inorganicization of sludge will greatly improve the dehydration performance of sludge. In this way, the final disposal cost of sludge will be greatly reduced.

In line with the above purpose, according to the No. 1 model, this patent sets up two reaction tanks of solid phase and liquid phase. In the solid phase reaction tank, the sludge particles are mainly hydrolyzed. The product undergoes a gas production reaction, and the hydrolyzate in the hydrolysis tank is washed by using the water from the gas production tank, and the hydrolyzate washed out enters the gas production tank to form a cycle. In this way, not only the solid-liquid two phases of the sludge are under the optimal reaction conditions, but also, because the sludge particles are repeatedly hydrolyzed, the purpose of increasing the sludge reduction rate is well realized.

Contents of the invention

The technical problem to be solved by the present invention is to provide a continuous elutriation sludge digestion system, which is composed of a sludge inlet tank, a hydrolysis tank, a gas production tank and a regulating tank, and is characterized in that it includes the following steps:

Step 1, hydrolysis: pump the sludge from the sludge inlet tank into the hydrolysis tank for hydrolysis reaction;

Step 2, elutriation: make the effluent of the gas production tank enter the hydrolysis tank, and push out the upper liquid in the hydrolysis tank;

Step 3, adjustment: the ejected liquid enters the adjustment tank;

Step 4, gas production: pump the liquid in the regulating tank into the gas production tank for fermentation to produce biogas and remove hydrolyzate;

Step 5, repeat: Repeat steps 2 to 5 to wash the sludge repeatedly until the set reaction time;

Step 6, sludge discharge: discharge part of the sludge from the lower part of the hydrolysis tank, and the volume of the sludge discharge is equal to the volume of the new sludge to be added;

Step 7: Repeat steps 1 to 7;

As a preference, a continuous elutriation sludge digestion system is composed of a sludge inlet tank, more than two hydrolysis tanks, a gas production tank and a regulating tank, and is characterized in that:

All of the hydrolysis tanks have a mud inlet pipe on the top, a water outlet on the upper part, a water inlet on the lower part, and a mud discharge port on the bottom; the mud inlet pipes of all the hydrolysis tanks are connected with the mud inlet tank; the water inlets of all the hydrolysis tanks All are connected to the water outlet of the gas-producing pool; the water outlets of all the hydrolysis pools are connected to the water inlet of the regulating pool; the water outlets of the regulating pool are connected to the water inlet of the gas-producing pool;

As a preference, a continuous elutriation sludge digestion system is composed of a sludge inlet tank, more than two hydrolysis tanks, a gas production tank and a regulating tank, and is characterized in that: there are mud inlet pipes on the top of all the hydrolysis tanks, and there are There is a water outlet, a water inlet at the lower part, and a mud discharge port at the bottom; the mud inlet pipe of the first hydrolysis tank is connected to the mud inlet tank; the mud discharge port of the first hydrolysis tank is connected to the second The mud inlet pipe of the hydrolysis tank is connected, the mud outlet of the second hydrolysis tank is connected with the mud inlet pipe of the third hydrolysis tank, and so on; the water inlets of all the hydrolysis tanks are connected with the outlet of the gas production tank The water outlets are connected; the water outlets of all the hydrolysis tanks are connected to the water inlets of the regulating tanks; the water outlets of the regulating tanks are connected to the water inlets of the gas production tanks.

The beneficial effect brought by the patent is that the sludge particles are placed in an optimal reaction environment, so that the reduction rate of the sludge is improved.

Description of drawings

Fig. 1 is a schematic process flow diagram of a continuous elutriation sludge digestion system according to Embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of a continuous elutriation sludge digestion system in Example 2 of the present invention.

Fig. 3 is a schematic structural view of a continuous elutriation sludge digestion system according to Embodiment 3 of the present invention.

detailed description

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiment one:

The continuous elutriation sludge digestion system shown in Figure 1 is composed of a sludge inlet tank 1, a hydrolysis tank 2, a gas production tank 3 and a regulating tank 4, and is characterized in that it includes the following steps:

Step 1, hydrolysis: pump the sludge from the sludge inlet tank 1 into the hydrolysis tank 2 for hydrolysis reaction;

Step 2, elutriation: make the effluent of the gas generation tank 3 enter the hydrolysis tank 2, and push out the upper layer liquid in the hydrolysis tank 2;

Step 3, adjustment: the ejected liquid enters the adjustment pool 4;

Step 4, gas production: pump the liquid in the adjustment tank 4 into the gas production tank 3, carry out fermentation to produce biogas and remove hydrolyzate;

Step 5, repeat: Repeat steps 2 to 5 to wash the sludge repeatedly until the set reaction time;

Step 6, sludge discharge: discharge part of the sludge from the lower part of the hydrolysis tank 2, and the volume of the sludge discharge is equal to the volume of the new sludge to be added;

Step 7: Repeat steps 1 to 7;

Embodiment two:

The continuous elutriation sludge digestion system shown in Figure 2 is composed of sludge inlet tank 1, hydrolysis tank 2, hydrolysis tank 22, hydrolysis tank 23, hydrolysis tank 24, gas production tank 3 and regulation tank 4, all hydrolysis tanks There is a mud inlet pipe 2-1 on the top, a water outlet 2-2 on the upper part, a water inlet 2-3 on the lower part, and a mud discharge outlet 2-4 at the bottom; the mud inlet pipes 2-1 of all hydrolysis tanks are connected with the mud inlet tank 1 Connection; all water inlets 2-3 of the hydrolysis tank are connected to the water outlet of the gas generation tank 3; all water outlets 2-2 of the hydrolysis tank are connected to the water inlet of the adjustment tank 4; the water outlet of the adjustment tank 4 is connected to the water inlet of the gas generation tank 3 connect;

With reference to Fig. 2, the operating method of the second embodiment is described as follows:

The sludge enters the whole hydrolysis tank from the sludge inlet tank 1 to carry out the hydrolysis reaction, and the sludge is washed with the effluent of the gas production tank 3 so as to take away the hydrolyzed products. The elutriation water flows into the adjustment tank 4, and the elutriation water in the adjustment tank is pumped into the gas production tank 3 for anaerobic fermentation to produce biogas and remove the hydrolyzate. Form a loop. According to the number of hydrolysis days required, arrange the number of hydrolysis tanks, empty one hydrolysis tank every day to make the sludge out of the system, and then add new sludge to this tank, and repeat this process for the next hydrolysis tank in the same order Operation, the sludge in each hydrolysis tank can achieve the same number of days of hydrolysis, and the whole system is in a state of continuous hydrolysis.

Embodiment three:

The continuous elutriation sludge digestion system shown in Figure 3 is composed of a sludge inlet tank 1, a hydrolysis tank 2, a hydrolysis tank 22, a hydrolysis tank 23, a hydrolysis tank 24, a gas production tank 3 and a regulating tank 4. All hydrolysis tanks There is a mud inlet pipe 2-1 on the top, a water outlet 2-2 on the upper part, a water inlet 2-3 on the lower part, and a mud discharge outlet 2-4 on the bottom; the mud inlet pipe 2-1 of the hydrolysis tank 2 is connected to the mud inlet tank 1 The mud outlet of hydrolysis tank 2 is connected with the mud inlet pipe of hydrolysis tank 22, and the mud outlet of hydrolysis tank 22 is connected with the mud inlet pipe of hydrolysis tank 23, and the mud outlet of hydrolysis tank 23 is connected with the mud inlet pipe of hydrolysis tank 24 Connection; the water inlets 2-3 of all hydrolysis tanks are connected with the water outlet of gas production tank 3; the water outlets 2-2 of all hydrolysis tanks are connected with the water inlet of adjustment tank 4; the water outlets of adjustment tank 4 are connected with the water inlet of gas production tank 3 .

Referring to Fig. 3, the operating method of the present embodiment three is described as follows:

The sludge enters the hydrolysis tank 2 from the sludge inlet tank 1 to carry out the hydrolysis reaction, and the hydrolyzed sludge enters the mud inlet pipe of the hydrolysis tank 22 through the sludge outlet 2-4, and continues to be hydrolyzed, and so on, the sludge undergoes hydrolysis 23, hydrolysis Pool 24, which is continuously hydrolyzed, eventually exits the system. The sludge hydrolyzate is elutriated out of the hydrolysis tank by the effluent of the gas generating tank 3, and the elutriation water enters the gas generating tank 3 again through the regulating tank 4 to remove the hydrolyzate, forming a cycle.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present invention within the spirit and protection scope of the present invention, and such modifications or equivalent replacements should also be deemed to fall within the protection scope of the present invention.

Claims (3)

1. a continuous washing type sludge digestion system, by entering mud sump, hydrolytic tank, aerogenesis pond, equalizing tank form, and it is characterized in that comprising the following steps:

Step one, hydrolysis: mud is pumped into hydrolytic tank from entering mud sump the reaction that is hydrolyzed;

Step 2, eluriates: make the water outlet in aerogenesis pond enter hydrolytic tank, the supernatant liquid in hydrolytic tank is ejected;

Step 3, regulates: the liquid be ejected enters equalizing tank;

Step 4, aerogenesis: the liquid in equalizing tank is pumped into aerogenesis pond, carries out fermentation methane production and removes hydrolysate;

Step 5, repeats: repeating step two to step 5, repeatedly eluriates mud; Until the reaction times of setting only;

Step 6, spoil disposal: from hydrolytic tank lower efflux portion mud, the volume of spoil disposal is equal with the new mud volume that will add;

Step 7: repeating step one to step 7.

2. a continuous washing type sludge digestion system, forming by entering mud sump, two or more hydrolytic tank, aerogenesis pond and equalizing tank, it is characterized in that: whole described hydrolytic tank top has into mud pipe, water outlet is arranged at top, water-in is arranged at bottom, mud discharging mouth is arranged at bottom; The mud Guan Jieyu that enters of whole described hydrolytic tank enters mud sump connection; Whole described hydrolytic tank water-in is all connected with aerogenesis pond water outlet; Whole described hydrolytic tank water outlet is all connected with equalizing tank water-in; Described equalizing tank water outlet is connected with described aerogenesis pond water-in.

3. a continuous washing type sludge digestion system, forming by entering mud sump, two or more hydrolytic tank, aerogenesis pond and equalizing tank, it is characterized in that: described whole hydrolytic tank top has into mud pipe, water outlet is arranged at top, water-in is arranged at bottom, mud discharging mouth is arranged at bottom; Described first hydrolytic tank enter mud pipe with described enter mud sump be connected; The mud discharging mouth of described first hydrolytic tank enters mud pipe with described second hydrolytic tank and is connected, and the mud discharging mouth of described second hydrolytic tank enters mud pipe with described 3rd hydrolytic tank and is connected, by that analogy; Whole described hydrolytic tank water-in is all connected with described aerogenesis pond water outlet; Whole described hydrolytic tank water outlet is all connected with described equalizing tank water-in; Described equalizing tank water outlet is connected with described aerogenesis pond water-in.