CN115571980A - A UASB reactor for treating high-concentration papermaking wastewater - Google Patents

Abstract

The invention discloses a UASB reactor for treating high-concentration papermaking wastewater, which comprises a tank body, a water distribution system, a three-phase separator, a biogas collection system and an external circulation system. Upper-layer sewage in the reactor is shunted along the central axis of the reactor through a water outlet of the circulating pipeline, and granular sludge in a reaction layer is impacted, so that the sewage and the granular sludge are fully mixed, the uniform water temperature in the reactor is facilitated, and the contact area of the sewage and the granular sludge is increased; circulation pipeline water inlet position can inhale come-up hollow granule mud, can guarantee again can not inhale full granule mud circulating pump in, destroy granule mud structure through the circulating pump, again through inside the circulation pipeline delivery port rush into the reactor, promote new and old granule mud to replace the growth, guaranteed that whole reactor's good has operation and efficient treatment.

Description

A UASB reactor for treating high-concentration papermaking wastewater

technical field

The invention relates to the technical field of UASB reactors, in particular to a UASB reactor for treating high-concentration papermaking wastewater.

Background technique

Pulping and papermaking wastewater is a high-concentration organic wastewater, and the country has stricter requirements on its discharge standards. The composition of papermaking wastewater is complex, the main features are high chroma, high COD, and contains a variety of other chemical substances. At present, the technologies for treating papermaking wastewater mainly include physical methods, chemical methods, physicochemical methods, biological methods, membrane technology and photocatalytic methods. Among many treatment methods, anaerobic biological treatment technology has become the preferred pretreatment method for papermaking wastewater because of its advantages of low energy consumption, high workload and low secondary pollution.

The present invention is based on the fact that high-concentration organic waste water enters the reaction layer, and the sewage cannot fully contact and react with the granular sludge in the reaction layer, resulting in slow reaction, low removal efficiency, uneven water temperature, and floating hollow granular sludge above the three-phase separator, etc. To solve the problem, an anaerobic external circulation system was constructed to achieve the purpose of strengthening the removal of pollutants, controlling the constant water temperature, and promoting the replacement and growth of new and old granular sludge, which significantly improved the removal efficiency and provided a guarantee for alleviating the workload of subsequent biochemical reactions.

Contents of the invention

The purpose of the present invention is to provide a UASB reactor for treating high-concentration papermaking wastewater in order to overcome the problems of insufficient contact between sewage and microorganisms in traditional UASB anaerobic reactors, uneven water temperature inside the reactor, and floating of hollow particle sludge.

According to the external circulation of the UASB anaerobic reactor, the water flow inside the reactor is driven to impact the granular sludge in the reaction layer, so as to overcome the shortcomings of insufficient contact between the traditional UASB sewage and microorganisms, homogenize the water temperature inside the reactor, and carry out the hollow sludge treatment. Destruction, promote the replacement growth of new and old granular sludge, and improve the efficiency of anaerobic reaction. The specific solution is: a UASB external circulation system for treating high-concentration papermaking wastewater, which is characterized in that: the system includes a tank body (1), a water inlet (3), a water distributor (4), a through hole (5 ), circulation pipeline water outlet (7), circulation pump (6), circulation pipeline water inlet (8), water outlet (9), biogas collection pipe (14), biogas collector (12), gas outlet (11 ), overflow weir (13), thermometer probe (2), three-phase separator (15), thermometer probe (16), flow meter (17), check valve (18), water inlet and outlet are respectively set in The lower end and upper end of the reactor, and each part of the circulation piping system are connected by pipes.

Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the water distributor (4) is laid on the bottom of the reactor, and the through holes (5) are densely covered in the water distributor (4) up.

Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the water inlet (3) is connected to the water distributor (4) and is located at the bottom of the reactor main body (1).

Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the water inlet (8) of the circulation pipeline is located above the three-phase separator (15).

Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the water outlet (7) of the circulation pipeline is located above the water distributor (4).

Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the shape of the section of the three-phase separator (15) is triangular, and the vertex angle is between 50° and 60° There is a biogas collection pipe (14) at the top corner, the biogas collection pipe (14) is connected to the biogas collector (12), and the check valve (18) is located in the middle section of the biogas collection pipe (14).

Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the elbow (10) is located in the biogas collector (12) and connected with the biogas collection pipe (14).

Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the circulation pump (6) is a screw pump, which is connected with the circulation pipeline outlet (7), flow meter (18 ) to the water inlet (8) of the circulation line.

Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the thermometer probe-1 (2) and the thermometer probe-2 (16) are respectively located in the reactor 1/3, 2 /3 places.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention, the number in the figure: 1: UASB reactor main body; 2: thermometer probe-1; 3: water inlet; 4: water distributor; 5: through hole; 6: circulating pump; 7 : circulation pipeline water outlet; 8: circulation pipeline water inlet; 9: water outlet; 10: elbow; 11: gas outlet; 12: biogas collector; 13: overflow weir; 14: biogas collection pipe; 15: Three-phase separator; 16: thermometer probe-2; 17: flow meter; 18: check valve.

Figure 2 is the COD removal efficiency before and after the circulation pump is turned on.

Figure 3 Temperature change before and after the circulation pump is turned on.

detailed description

In order to achieve the objectives, technical solutions and advantages of the embodiments of the present invention, the present invention will be further described below in conjunction with the following embodiments. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

What the present invention proposes is a kind of UASB reactor for the treatment of high-concentration papermaking wastewater, comprising the following steps:

(1) Build a water storage system and connect it to the UASB water inlet;

(2) Construct the UASB system, use plexiglass to make accessories and assemble them;

(2) Prepare a sufficient amount of anaerobic granular sludge;

(3) Filling with anaerobic granular sludge;

(4) Take wastewater from the paper mill, carry out microbial domestication, start water intake, and domesticate for a week;

(6) Formal operation.

The present invention will be described in detail below in conjunction with specific examples.

Example 1: Raw water from sewage plant in paper industry park, COD 4500 mg/L, water temperature 20°C; UASB hydraulic retention time: 13.5 h.

Set two time periods every day to collect the influent and effluent water samples in the system, use the standard method to measure the COD concentration (TU-1810, PUXI, China), and use the digital display thermometer (TDM-280) to measure the water temperature . All reagents used are analytical grade reagents, analyzed in duplicate, after 20 days of water temperature and COD data monitoring, it is found that after the circulation pump is turned on, the COD removal efficiency is about 10% higher than before the circulation pump is turned on; the water temperature inside the reactor is more stable, The change is small.

Claims (9)

1. The utility model provides a UASB extrinsic cycle system for handling high concentration papermaking waste water which characterized in that: the system comprises a tank body (1), a water inlet (3), a water distributor (4), a through hole (5), a circulating pipeline water outlet (7), a circulating pump (6), a circulating pipeline water inlet (8), a water outlet (9), a methane collecting pipe (14), a methane collector (12), a gas outlet (11), an overflow weir (13), a thermometer probe (2), a three-phase separator (15), a thermometer probe (16), a flowmeter (17) and a check valve (18), wherein the water inlet and the water outlet are respectively arranged at the lower end and the upper end of a reactor, and all parts of a circulating pipeline system are connected by pipelines.

2. Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the water distributor (4) is laid at the bottom of the reactor, and the through holes (5) are densely distributed on the water distributor (4).

3. Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the water inlet (3) is connected with the water distributor (4) and is positioned at the bottom of the reactor main body (1).

4. Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the water inlet (8) of the circulating pipeline is positioned above the three-phase separator (15).

5. Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the water outlet (7) of the circulating pipeline is positioned above the water distributor (4).

6. Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the section of the three-phase separator (15) is triangular, the angle of a vertex angle is 50-60 degrees, a biogas collecting pipe (14) is arranged at the vertex angle, the biogas collecting pipe (14) is connected with a biogas collector (12), and the check valve (18) is positioned at the middle section of the biogas collecting pipe (14).

7. Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the elbow (10) is positioned in the biogas collector (12) and is connected with the biogas collecting pipe (14).

8. Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the circulating pump (6) is a screw pump and is connected with the circulating pipeline water outlet (7), the flowmeter (18) and the circulating pipeline water inlet (8).

9. Preferably, the UASB reactor for treating high-concentration papermaking wastewater is characterized in that: the thermometer probe-1 (2) and the thermometer probe-2 (16) are respectively positioned at 1/3 and 2/3 of the reactor.

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