CN106745594A - One kind precipitation method for treating water - Google Patents

Abstract

A sedimentation water treatment method, which comprises a folding plate vortex cooperative flocculation unit, an inclined tube sedimentation unit, a sludge return and discharge unit, and a sludge discharge pipe backwashing unit. Among them, the folded-plate vortex cooperative flocculation unit is composed of four folded-plate vortex reaction chambers, and the raw water passes through the four folded-plate vortex reaction chambers in turn through the pipeline mixer through the inlet pipe, and then enters the inclined tube sedimentation unit through the transition zone; The plate vortex reaction chamber is equipped with the same corrugated plate, different corrugated plate and different types of vortex reactors, and there are sludge return, discharge and backwashing device units at the bottom. The present invention improves the efficiency of flocculation reaction, has remarkable effects on improving the water volume and water quality of purified water, ensures clarification efficiency and sedimentation effect at the same time, can effectively save water resources and coagulation dosage, and has high social and social benefits. economic benefits.

Description

A kind of precipitation water treatment method

technical field

The invention belongs to the field of environmental protection, and relates to a folded plate eddy current cooperative flocculation and inclined tube sedimentation water treatment method. It is proposed based on the theory of vortex synergistic coagulation technology, shallow pool theory and sludge return enhanced coagulation theory.

Background technique

At present, my country's urban water supply industry is facing the dual pressure of water source water quality pollution and water supply quality standard improvement. In addition, the difficulty of drinking water has plagued my country's rural areas and some townships for a long time, seriously restricting the improvement of local residents' living conditions and the development of rural economy. Solving the safety of drinking water in rural areas and some towns is a livelihood project that the Party Central Committee and the State Council attach great importance to and that is urgently needed by the broad masses of farmers. It is a concrete manifestation of implementing the Scientific Outlook on Development. Combined with the development trend of cities and towns in my country and the current economic situation, improving and strengthening the traditional water purification treatment process is one of the more economical and effective technical means for water plants to increase water production and improve effluent water quality.

The clarifier is a structure that integrates the flocculation reaction process and the clarification and separation process. At present, many clarifiers commonly used in my country's water treatment are facing problems such as aging, low water production efficiency, and poor effluent quality. For example, the mechanical agitation clarifier with a large amount of treated water has disadvantages such as mechanical investment and maintenance troubles; the hydraulic circulation clarifier has the disadvantages of difficult control of sludge return flow and poor adaptability. There are some deficiencies in the safe drinking water projects used in rural areas and some towns, so technical transformation is urgently needed to meet the needs of urban and rural users for water quantity and water quality under the new situation. The new clarification technology developed abroad, because it is a patented product, the equipment and materials are relatively expensive, and the investment is high, so it is difficult to promote it on a large scale in China. Therefore, it is very necessary to develop an economical and efficient clarification technology that is more optimized, simple to operate, and convenient to operate and maintain to adapt to rural safe drinking water projects.

Contents of the invention

The purpose of the present invention is to provide a method for the reconstruction and expansion of old water plants in cities and towns and the cooperative flocculation of folded plate eddy current and inclined tube sedimentation water in rural safe drinking water projects

The present invention adopts following technical scheme

A sedimentation water treatment method, raw water added with a coagulant flows sequentially through a first folded plate vortex reaction chamber, a second folded plate vortex reaction chamber, a third folded plate vortex reaction chamber and a fourth folded plate vortex reaction chamber from a water inlet pipe through a tubular mixer Plate vortex reaction chamber; wherein, the first folded plate vortex reaction chamber communicates with the bottom of the second folded plate vortex reaction chamber, the second folded plate vortex reaction chamber communicates with the top of the third folded plate vortex reaction chamber, and the third folded plate vortex reaction chamber communicates with the second folded plate vortex reaction chamber The bottom of the four-fold plate vortex reaction chamber is connected; after the raw water completes the flocculation stage in the first-fourth fold-plate vortex reaction chamber, it flows into the buffer zone of the inclined tube sedimentation unit through the transition zone, and then completes the sedimentation stage in the inclined tube area, and clear water after precipitation The clear water in the area passes through the sump, the outlet channel, and finally flows out of the outlet pipe; The bulk sediment is collected by the first row of mud pipes and the second row of mud pipes; the sediment produced in the inclined pipe area sinks to the sludge layer at the bottom of the buffer zone due to gravity, and is collected by the sludge hopper and the third row of mud pipes; The sludge collected by the three sludge discharge pipes is collected at the end, and part of the sludge is returned to the raw water inlet pipe through the return pipe to enhance the coagulation effect. The excess sludge is discharged through the vent pipe, and the sludge discharge system is also equipped with high-pressure backwashing Water pipes, regularly flush and disturb the sludge layer near the sludge discharge pipe and sludge hopper to prevent sludge from accumulating in the sludge discharge pipe and the bottom of the tank.

Beneficial effect:

First, four folded-plate vortex reaction chambers arranged transversely are arranged in the flocculation reaction unit, namely, the first folded-plate vortex reaction chamber, the second folded-plate vortex reaction chamber, the third folded-plate vortex reaction chamber and the fourth folded-plate vortex reaction chamber. The reaction chamber is equipped with three different sections of folded plates, the first section is a different folded plate, the second is a same folded plate, and the third is a parallel straight plate, which is conducive to the growth of flocs and makes the mixing reaction as complete as possible. And it will not cause the flocs to be broken. At the same time, two types of vortex flocculation reactors are installed in the reaction chamber, and the vortex reaction time, the height of the vortex area, and the combination sequence of the vortex reactors in each reaction chamber and the control of the opening ratio Designed according to the quality of raw water treatment. After the water flow added with coagulant passes through the folded plate and the vortex reactor, the water flow forms a tiny vortex flow, which is conducive to the diffusion of particles in the water, fully utilizes the fluid energy, and at the same time utilizes the synergistic flocculation of the folded plate and the vortex to increase destabilization The collision probability of colloidal particles forms a solid-liquid two-phase system with better flocculation quality, high density and good separation performance, and fundamentally improves the efficiency of flocculation reaction, which has a significant effect on improving the amount and quality of purified water.

Second, an inclined tube precipitator is installed in the clarification and separation chamber, which strengthens the precipitation of fine particles, better ensures the sedimentation effect and clarification efficiency of the clarification tank, and has a higher surface hydraulic load.

Third, a sludge return device is added to return part of the sludge to the raw water, and then mix it with the raw water for treatment, which plays a role in strengthening coagulation. At the same time, the sludge discharge water is used as a resource, which not only improves the treatment efficiency but also saves water resources. Reduce sludge discharge and disposal. The system reflux parameters control different reflux ratio and other parameters according to the raw water quality, as shown in Table 1.

Fourth, the sludge discharge system is also equipped with a high-pressure backwashing water pipe to regularly flush and disturb the sludge layer near the sludge discharge pipe and the sludge hopper to prevent sludge from accumulating in the sludge discharge pipe and the bottom of the tank.

The application of this technology can improve the flocculation reaction efficiency of the water purification process, shorten the flocculation time, reduce the water head loss, reduce the chemical consumption, improve the water quality of the water purification, and also improve the separation efficiency of the sedimentation, reduce the sludge output, and have a comparative advantage. High social and economic effects.

The invention can solve the deficiencies such as poor flocculation and purification effects, high energy consumption and the like that generally exist in clarification tanks. The folded plate eddy current cooperative flocculation and inclined tube sedimentation water treatment method provided by the present invention is proposed based on folded plate micro eddy current cooperative coagulation technology, shallow pond theory and sludge reflux enhanced coagulation theory. The technology mainly includes folded plate micro-vortex synergistic reaction technology, inclined tube sedimentation separation technology and sludge reflux enhanced coagulation technology.

The outstanding advantage of the present invention is that the flocculation reaction unit can be properly modified while maintaining most of the structure of the existing clarification tank, and a folded-plate vortex reactor can be auxiliary placed in it to obtain a good purification effect. According to different water quality, by controlling the water flow velocity and the opening ratio of the vortex reactor, and at the same time adjusting the parameters such as the reflux ratio of the reflux sludge, a better purification effect can be obtained.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

detailed description

Below in conjunction with specific embodiment, further illustrate the present invention.

As shown in the figure, the water added with coagulant flows through the tubular mixer 2 from the water inlet pipe 1 and flows through the first flap vortex reaction chamber 5, the second flap vortex reaction chamber 6, the third flap vortex reaction chamber 7 and the third flap vortex reaction chamber. The four-fold plate vortex reaction chamber 8, the first folded plate vortex reaction chamber 5 and the second folded plate vortex reaction chamber 6 are all different folded plates, and a type I vortex reactor 4 is placed inside; the third folded plate vortex reaction chamber 7 The fourth folded plate vortex reaction chamber 8 is the same folded plate, and a type II vortex reactor 10 is placed in it at the same time. After the water flow passes through the folded plate and the vortex reactor, countless small eddies are formed, which makes the quality of the floc alum flower formed by the flocculation reaction water higher, the water quality of the effluent is more stable, and the impact load resistance is improved. The spacing of the flaps in each reaction chamber, the vortex reaction time, the height of the vortex zone, the combination sequence of the vortex reactors and the control of the opening ratio are designed according to the quality of the raw water to be treated. The water flows into the buffer zone 12 through the transition zone 9, and then further solid-liquid separation is carried out through the inclined tube zone 13 set by the sedimentation unit. The separated water flows into the sump 15 through the clear water zone 14 with uniform water distribution, and then enters the outlet pipe 17 through the outlet channel 16 and flows out .

The floc sediment produced by the first flap vortex reaction chamber 5 and the second flap vortex reaction chamber 6 is collected and discharged by the first mud discharge pipe 20 respectively; the third flap vortex reaction chamber 7 and the fourth flap vortex reaction chamber 8 The floc sediment produced is collected and discharged by the second mud discharge pipe 21 . The sediment produced in the inclined pipe area 13 sinks to the sludge layer 18 at the bottom of the buffer zone 12 due to gravity, and is collected by the sludge hopper 19 and the third sludge discharge pipe 22. The sludge collected by the three sludge discharge pipes is finally collected uniformly. Part of the sludge is returned to the raw water through the return pipe to enhance the coagulation effect, and the excess sludge is discharged through the vent pipe. During normal operation, the valve on the high-pressure backwash water pipe 23 remains normally closed; when the mud discharge pipe is to be backwashed, the valve on the high-pressure backwash water pipe 23 is opened, and the first mud discharge pipe 20 and the second mud discharge pipe are closed. 21. The valves on the third row of mud pipe 22 and the sludge return pipe 24, and the valve of the vent pipe 25 are also closed first, and the high-pressure water is used to clean each mud discharge pipe, and at the same time loosen the hardened sludge near the sludge hopper , and finally the cleaned mud water is discharged through the vent pipe 25. Table 1 shows the effect of sludge return ratio on effluent water quality under different turbidity.

Table 1 Effect of sludge reflux ratio on effluent quality under different turbidity

Raw water turbidity 0～15NTU 15～80NTU 80～200NTU >200NTU Sludge return ratio 0-30% 10-50% 30-70% 50～90%

It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims (8)

1. a kind of precipitation method for treating water, adds the raw water of coagulant to flow through the successively through tube mixer (2) from water inlet pipe (1) One folded plate whirling reaction chamber (5), the second folded plate whirling reaction chamber (6), the 3rd folded plate whirling reaction chamber (7) and the 4th folded plate vortex Reative cell (8)；Wherein, the first folded plate whirling reaction chamber (5) is communicated with second folded plate whirling reaction chamber (6) bottom, second eddy current Reative cell (6) is communicated with the 3rd folded plate whirling reaction chamber (7) top, and the 3rd folded plate whirling reaction chamber (7) is vortexed with the 4th folded plate Reative cell (8) bottom communicates；

Raw water flows into tube settling list after first to fourth folded plate whirling reaction chamber completes flocculated stage by transition region (9) The buffering area (12) of unit, then completes precipitate phase in inclined tube area (13), and the clear water of clear water zone (14) is through water leg after precipitation (15), outlet canal (16), are finally flowed out by outlet pipe (17)；

First folded plate whirling reaction chamber (5) and the second folded plate whirling reaction chamber (6) and the 3rd folded plate whirling reaction chamber and four fold The floccule body sediment that plate whirling reaction chamber is produced is collected by the first discharge pipeline (20) and the second discharge pipeline (21) respectively；Inclined tube area (13) sediment for producing sinks down into the sludge blanket (18) of buffering area (12) bottom because of gravity, then by sludge bucket (19) and the 3rd row Mud pipe (22) is collected；The sludge finally unified collection that three discharge pipelines are collected, a part of sludge is back to original through return duct (24) Water water inlet pipe (1) is discharged for enhanced coagulation effect, unnecessary sludge through blow-down pipe (25), high pressure is additionally provided with sludge drainage system anti- Sludge blanket near wash tub pipe (23), periodic flushing and disturbance discharge pipeline and sludge bucket, prevents sludge in discharge pipeline and bottom of pond Alluvial is hardened.

2. one kind according to claim 1 precipitates method for treating water, it is characterised in that：Folded plate flocculation and vortex make use of to wad a quilt with cotton Solidifying synergy, improves flocculation rate, with good flocculating effect.

3. one kind according to claim 1 precipitates method for treating water, it is characterised in that：In flocculation unit there is provided three sections not Same folded plate, first paragraph is different setback plate, i.e. the first folded plate whirling reaction chamber (5) and the second folded plate whirling reaction chamber (6), second Duan Weitong setback plates, i.e. the 3rd folded plate whirling reaction chamber (7) and the 4th folded plate whirling reaction chamber (7), the 3rd section is parallel straight panel, That is transition region (9)；According to theory of flocculation, it is arranged so as to contribute to the growth of flco, hybrid reaction is tried one's best completely, and do not cause Flco it is broken.

4. one kind according to claim 1 precipitates method for treating water, it is characterised in that：First folded plate whirling reaction chamber and The I type Vortex reactor (4) laid in two folded plate whirling reaction chambers is the hollow sphere of an a diameter of 150mm, and sphere is provided with one The hole being sized, percent opening is 40%~55%.Put in 3rd folded plate whirling reaction chamber and the 4th folded plate whirling reaction chamber peace II type Vortex reactor (10) be an a diameter of 200mm hollow sphere, sphere is provided with the hole of certain size, and percent opening is 50%~70%.

5. one kind according to claim 1 precipitates method for treating water, it is characterised in that：In precipitation unit there is provided inclined tube is heavy Shallow lake device (13), enhances the precipitation to tiny particles content, better assures that the sedimentation effect and clarifying efficiency of depositing reservoir, has Hydraulic surface loading higher.

6. one kind according to claim 1 precipitates method for treating water, it is characterised in that：There is provided sludge refluxing apparatus, i.e., Mud return line (24), sludge reflux can play a part of enhanced coagulation, and (its reflow parameters is distinguished according to raw water quality difference The parameters such as the different reflux ratio of control), preferable coagulation effect can make deposition efficiency more preferably, while spoil disposal water obtains resource profit With, treatment effeciency also saving water resource is not only improved, reduce mud discharging and disposal amount.

7. one kind according to claim 1 precipitates method for treating water, it is characterised in that：There is provided high pressure backwash water pipe (23), can periodic flushing play a part of disturbance sludge blanket and loosen hardened sludge, prevent pool bottom sludge from depositing.

8. one kind according to claim 1 precipitates method for treating water, it is characterised in that：The first folded plate whirling reaction chamber (5) there is folded plate reactor (3) and I type Vortex reactor (4) in；The buffering area (12) of transition region (9) and tube settling unit Between have a distributing hole (11).