CN103623627A - Method for treating sewage by using biological active sand reactor - Google Patents

Abstract

The invention discloses a method for treating sewage with a bioactive sand reactor. (1) Build a biologically active sand reactor with built-in filter material (granular activated carbon), including water inlet pipe, water distributor, outlet weir, sand guide cone, air lift pump, sand lifting nozzle, sand lifting pipe, sand washing device, sand washing water outlet and electrical control system. (2) The sewage is introduced into the sewage from the water inlet pipe, and the water is evenly distributed through the water distributor. The sewage flows upstream from the bottom. After passing through the filter material, the impurities in the sewage are filtered, and the turbidity and chromaticity in the sewage are effectively removed; the microorganisms in the water adhere to Biofilm is formed on the filter material and the organic pollutants in the water are absorbed and used as nutrients, and the organic pollutants in the sewage are removed. The invention combines the filtering function and biological treatment function of common active sand filters, can strengthen the ability of active sand filters to remove organic pollutants, and at the same time make the removal of turbidity and chroma more remarkable.

Description

A method of treating sewage with biologically active sand reactor

technical field

The invention relates to the field of advanced sewage treatment and micro-polluted water purification, in particular to a method for treating sewage with a biologically active sand reactor, which is used for urban sewage treatment.

Background technique

At present, most of the urban sewage treatment plants in my country adopt the first-level B standard discharge standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002). As long as the discharge meets the standard, it will have little impact on the environment. However, with the rapid development of my country's social economy, the urban population has increased sharply, and the daily water consumption in cities and towns has increased sharply. In recent years, the total amount of wastewater discharge has shown an obvious upward trend, which has caused relatively large pressure on the environment in some areas. Under such circumstances, if the sewage treatment plant is still operated according to the first-level B standard, nitrogen and phosphorus will accumulate in the water body, especially if it is discharged into a closed water body, it will cause eutrophication of the water body, especially in the summer drought period, and the water quality will deteriorate seriously. , the ecological balance is destroyed, and the health of the masses is greatly affected.

At present, the adoption of new technology and new equipment is a technical means in the upgrading and transformation of urban sewage treatment plants. Filtration is a key link in sewage treatment. Traditional filters have problems such as large footprint, low backwash efficiency of filter material, and hardening of filter material. Activated sand filter is a combination of flocculation, clarification and filtration. Compared with traditional filters, continuous filtration equipment has the advantages of small footprint, low energy consumption, thorough backwash cleaning, no hardening of filter materials, and high load bearing capacity. However, the simple activated sand filter has limited ability to treat organic pollutants, and it is difficult to meet the needs of actual use.

Contents of the invention

The purpose of the present invention is to provide a method for treating sewage with a biologically active sand reactor in combination with filtration and biological action for advanced treatment of sewage.

The specific steps are

(1) Build a biologically active sand reactor with built-in filter material (granular activated carbon), including water inlet pipe, water distributor, outlet weir, sand guide cone, air lift pump, sand lifting nozzle, sand lifting pipe, sand washing device, sand washing water outlet and electrical control system. The top side of the bioactive sand reactor is the outlet weir, and the lower part of the outlet weir has a sand washing water outlet. The middle part of the bioactive sand reactor has a water inlet pipe, and the bottom of the water inlet pipe is connected to the water distributor, and the bottom of the water distributor is connected to the sand guide cone. , the sand lifting pipe stands in the middle of the biologically active sand reactor, the upper end of the sand lifting pipe is a sand washing device, the lower end of the sand lifting pipe is a sand lifting air nozzle, the sand lifting air nozzle is connected to an air lift pump, and the other end of the air lift pump is connected to the electric connected to the control system.

(2) The sewage is introduced into the sewage from the water inlet pipe, and the water is evenly distributed through the water distributor. The sewage flows upstream from the bottom. After passing through the filter material, the impurities in the sewage are filtered, and the turbidity and chromaticity in the sewage are effectively removed; the microorganisms in the water adhere to The biofilm is formed on the filter material and the organic pollutants in the water are absorbed and used as nutrients, and the organic pollutants in the sewage are removed; the purified filtrate flows out from the outlet weir at the top. The sand guide cone guides the filter material with trapped pollutants to the bottom. The air lift pump compresses the air to the sand lifting nozzle to lift the dirty filter material through the sand lifting tube to the sand washing device for cleaning. The sand washing water flows out from the sand washing water outlet, and the cleaned filter material returns to the filter. The bed goes into the next cycle. The electrical control system is used to control the start, operation and alarm of the biological active sand reactor and the air lift pump.

The invention realizes the filtering function of the general active sand filtering system, and at the same time hangs the biofilm on the filter material to remove the organic pollutants in the sewage, and the microorganisms make the whole system have a more remarkable effect of removing the chroma and turbidity.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the overall structure of the present invention.

Marks in the figure: 1-filter material, 2-water inlet pipe, 3-water distributor, 4-water outlet weir, 5-sand guide cone, 6-air lift pump, 7-sand lift nozzle, 8-lift Sand pipe, 9-sand washer, 10-sand washing water outlet, 11-electrical control system.

Detailed ways

Example:

(1) As shown in Figure 1, build a biologically active sand reactor with a built-in filter material 1 (granular activated carbon with a particle size of 10-20 mesh), and also includes a water inlet pipe 2, a water distributor 3, an outlet weir 4, and a sand guide cone 5 , Air lifting pump 6, sand lifting nozzle 7, sand lifting pipe 8, sand washing device 9, sand washing water outlet 10 and electrical control system 11. The top side of the biologically active sand reactor is the outlet weir 4, the lower part of the outlet weir 4 has a sand washing water outlet 10, the middle part of the biologically active sand reactor has a water inlet pipe 2, and the lower part of the water inlet pipe 2 is connected to the water distributor 3, and the water distributor 3 The lower part is connected with the sand guiding cone 5, the sand lifting pipe 8 stands in the middle of the biologically active sand reactor, the sand washing device 9 is outside the upper end of the sand lifting pipe 8, and the sand lifting nozzle 7 is at the lower end of the sand lifting pipe 8. 7 is externally connected to the air lift pump 6, and the other end of the air lift pump 6 is connected to the electrical control system 11.

(2) Sewage is introduced into the sewage from the water inlet pipe 2, and the water is evenly distributed through the water distributor 3. The sewage flows from the bottom to the top, and the impurities in the water are filtered through the filter material 1 in the filter bed, and the turbidity and chromaticity in the sewage are effectively reduced. remove. Gradually increase the influent flow rate to the design flow rate. After 10 to 30 days of continuous water flow, the microorganisms in the water adhere to the filter material 1 to form a biofilm and absorb organic pollutants in the water as nutrients, and the organic pollutants in the sewage are removed. ; The purified filtrate flows out from the outlet weir 4 at the top.

When it is monitored that the turbidity of the effluent deteriorates, the air lift pump 6 is turned on for intermittent sand washing. The sand guide cone 5 guides the filter material 1 which has retained pollutants to the bottom. The air lift pump 6 compresses the air to the sand lifting nozzle 7 to lift the dirty filter material 1 through the sand lifting pipe 8 to the sand washing device 9 for cleaning. The sand washing water flows out from the sand washing water outlet 10, and the cleaned The filter material 1 returns to the filter bed to enter the next cycle. The electrical control system 11 is used to control the start, operation and alarm of the bioactive sand reactor and the air lift pump 6, so as to achieve the purpose of automatic and stable operation of the bioactive sand reactor and automatic intermittent sand washing.

The COD, turbidity, and chromaticity in the treated water meet or exceed the first-class A standard in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB 18918-2002).

Claims (1)

1. by a method for biologically active sand reactor for treatment town sewage, it is characterized in that being that concrete steps are:

(1) set up a biologically active sand reactor, in-built filtrate (1), also comprises water inlet pipe (2), water-locator (3), effluent weir (4), leads abrasive cone (5), air lift (6), carries sand valve (7), sand extraction tube (8), sand-washing device (9), washed-out sand water out (10) and electric control system (11), biologically active sand reactor top one side is effluent weir (4), washed-out sand water out (10) is arranged at effluent weir (4) bottom, there is water inlet pipe (2) at biologically active sand reactor middle part, water inlet pipe (2) below is connected with water-locator (3), water-locator (3) below with lead abrasive cone (5) and be connected, sand extraction tube (8) stands on biologically active sand reactor middle part, outside, sand extraction tube (8) upper end is sand-washing device (9), sand extraction tube (8) lower end is for carrying sand valve (7), carry the external air lift of sand valve (7) (6), air lift (6) other end is connected with electric control system (11),

(2) by water inlet pipe (2), pass into sewage, through water-locator (3) uniform water distribution, sewage is flowed to upper by subinverse, through filter bed, from the effluent weir (4) at top, flows out; Lead abrasive cone (5) and will hold back filtrate (1) the guiding bottom of pollutant; Air lift (6) cleans to carrying sand valve (7) air compressing for dirty filtrate (1) is promoted to sand-washing device (9) by sand extraction tube (8), washed-out sand water is flowed out by washed-out sand water out (10), and the filtrate being cleaned (1) comes back to filter bed and enters next circulation; Electric control system (11), for controlling startup, operation and the warning of biologically active sand reactor and air lift (6), reaches the operation of biologically active sand reactor automatic stabilisation and automatic intermittent washed-out sand;

Described filtrate (1) is particle diameter 10 ~ 20 object granular activated carbons.

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