CN103771626B - Reactor for integrally treating deeply-dehydrated sludge water and concentrated and dehydrated sludge water - Google Patents

Abstract

The invention relates to a reactor for integrated treatment of advanced dewatered sludge water and concentrated dewatered sludge water. The reactor includes an integrated filter unit, a mixing reaction unit and a sedimentation unit. Water outlet, concentrated dewatered sludge water outlet, filter assembly and concentrated dewatered sludge water filter outlet, mixing reaction unit is equipped with deep dewatered sludge water inlet and agitator, sedimentation unit is equipped with sediment collection port and purified sewage muddy water export. Compared with the prior art, the present invention removes more than 95% of the suspended solids in concentrated dewatered sludge water due to the high-efficiency filter device, and the turbidity of the effluent is lower than 5 NTU, and then mixed with deep dewatered sludge water, which can not only improve the removal of pollutants The effect, and the phosphorus content of the generated sediment is also significantly increased, which is conducive to the resource utilization of phosphorus in sewage.

Description

Reactor for integrated treatment of deep dewatered sludge water and concentrated dewatered sludge water

technical field

The invention belongs to the field of sewage treatment, and relates to a sewage treatment device, in particular to a reactor for integrated treatment of deep dewatered sludge water and concentrated dewatered sludge water.

Background technique

The sewage biological treatment technology represented by the activated sludge method will discharge a large amount of excess sludge with a water content higher than 99% while purifying the sewage. It is a routine sewage treatment plant to achieve sludge volume reduction through the process of sludge concentration and dehydration. mud treatment process. The wastewater generated during the sludge thickening and dewatering process is called concentrated dewatered sludge water. With the further improvement of urbanization, the amount of sewage treatment in China has increased, and the amount of sludge has also increased significantly. However, land resources are becoming more and more tense. After concentration and dehydration, sludge with a moisture content of about 80% can no longer meet the landfill requirements. , The sludge needs to be further conditioned and dehydrated to reach a water content below 60% before it can be landfilled. In the sludge deep dehydration treatment process, it is necessary to add FeCl ₃ , quicklime, etc. to the sludge for conditioning, release bound water, adsorbed water and internal water through cell wall breaking, improve the dehydration performance of the sludge, and then dehydrate to The moisture content is less than 60%, and the special conditions can reach less than 50%. At present, the sludge deep dehydration technology has been practically applied in Hangzhou Qige, Wuxi Lucun, Xiamen, Jimei and other sewage treatment plants. The wastewater produced during the deep dewatering of sludge is called deep dewatered sludge water.

With the increase in the water content requirements for sludge landfill disposal, the water volume of deep dewatered sludge increased from 220t/d in 2006 to 8220t/d in 2013, and the number of projects increased from 1 in 2006 to 37 in 2013. At present, most large-scale sewage treatment plants have two kinds of sludge water, concentrated dewatered sludge water and deep dewatered sludge water. The concentration of suspended matter, organic matter and orthophosphorus in concentrated dewatered sludge water was higher, and the concentration of organic matter and Ca ²⁺ ion in deep dewatered sludge water was higher. Mix the deep dewatered sludge water with the concentrated dewatered sludge water, the Ca ²⁺ in the deep dewatered sludge water will react with the orthophosphorus in the concentrated dewatered sludge water to form calcium phosphate and hydroxyapatite and other precipitates, and at the same time, some organic matter. However, the suspended solids in the concentrated dewatered sludge water are relatively high, and the direct mixing of the two sludge waters will not only reduce the pollutant removal efficiency, but also have a low content of available phosphorus in the formed solids, which is not conducive to resource utilization.

Contents of the invention

The object of the present invention is to provide a reactor for integrated treatment of deep dewatered sludge water and concentrated dewatered sludge water with simple structure and remarkable sewage treatment effect in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

A reactor for integrated treatment of advanced dewatered sludge water and concentrated dewatered sludge water, the reactor includes an integrated filter unit, a mixing reaction unit and a sedimentation unit, the filter unit is provided with a concentrated dewatered sludge water inlet Water outlet, concentrated dewatered sludge water outlet, filter assembly and concentrated dewatered sludge water filter outlet, the mixing reaction unit is provided with deep dewatered sludge water inlet and agitator, and the sedimentation unit is provided with sedimentation Material collection port and outlet of purified sludge water;

The concentrated dewatered sludge water enters the filter unit from the concentrated dewatered sludge water inlet. After being separated by the filter assembly, the particulate matter is intercepted and discharged from the concentrated dewatered sludge water outlet. The concentrated dewatered sludge water is filtered out from the concentrated The dewatered sludge water filter outlet enters the mixing reaction unit, mixes and reacts with the deep dewatered sludge water entering from the deep dewatered sludge water inlet, and the formed precipitate is discharged through the sediment collection port, and the supernatant is purified sewage Muddy water is discharged from the outlet of purified sludge water.

The concentrated dewatered sludge water inlet and the concentrated dewatered sludge water outlet are arranged on the lower side of the filter assembly, and the concentrated dewatered sludge water filter outlet is arranged on the upper side of the filter assembly.

The filter component is a filter net.

The filter screen is a double-layer structure, the lower side is a 150-mesh filter screen, and the upper side is a 500-mesh filter screen.

The filtering unit is a cone, the mixing reaction unit and the precipitation unit share a cone, and the bottom of the mixing reaction unit communicates with the precipitation unit.

The agitator is a three-bladed paddle agitator.

The concrete steps of using the reactor of the present invention to integrate treatment of deep dewatered sludge water and concentrated dewatered sludge water are as follows:

The concentrated dewatered sludge water first enters the filter unit from the concentrated dewatered sludge water inlet and flows from bottom to top. After passing through the filter assembly (small pore filter), the large particles in the concentrated dewatered sludge water can be directly settled in the unit. Small particles can be filtered through a small pore filter and discharged from the concentrated dewatered sludge outlet.

The filtered water from the concentrated dewatered sludge water enters the mixed reaction unit from the filtered outlet of the concentrated dewatered sludge water, and the deep dewatered sludge water is pumped into the mixed reaction unit according to a certain flow ^rate . The PO ₄ ^3- in the filtered sludge water undergoes a precipitation reaction, and some organic matter will be removed through co-precipitation.

In the sedimentation unit, the sediment formed by the reaction of the concentrated dewatered sludge water and the deep dewatered sludge water will settle under the action of gravity and be discharged through the sediment collection port. The supernatant is purified sludge water, which is obtained from the purified sludge The water outlet is discharged.

Compared with the prior art, the present invention removes more than 95% of the suspended solids in concentrated dewatered sludge water due to the high-efficiency filter device, and the turbidity of the effluent is lower than 5 NTU, and then mixed with deep dewatered sludge water, which can not only improve the removal of pollutants The effect, and the phosphorus content of the generated sediment is also significantly increased, which is conducive to the resource utilization of phosphorus in sewage.

Description of drawings

Fig. 1 is the structural representation of reactor of the present invention;

Fig. 2 is a schematic diagram of comparison of phosphorus removal efficiency between the traditional technology and the present invention under different volume ratios of deep dewatered sludge water and concentrated dewatered sludge water.

Labels in the figure: A is the filter unit, B is the mixing reaction unit, C is the sedimentation unit, 1 is the water inlet of the concentrated dewatered sludge water, 2 is the sludge discharge port of the concentrated dewatered sludge water, 3 is the filter assembly, and 4 is the concentrated dewatering Sludge water filter outlet, 5 is deep dehydration sludge water inlet, 6 is agitator, 7 is purified sludge water outlet, 8 is sediment collection port.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

The reactor for integrated treatment of advanced dewatered sludge water and concentrated dewatered sludge water, as shown in Figure 1, the reactor includes an integrated filter unit A, mixing reaction unit B and precipitation unit C, and filter unit A is equipped with Concentrated dewatered sludge water inlet 1, concentrated dewatered sludge water outlet 2, filter assembly 3 and concentrated dewatered sludge water filter outlet 4, mixing reaction unit B is provided with deep dewatered sludge water inlet 5 and stirring 6, the sedimentation unit C is provided with a sediment collection port 8 and a purified sludge water outlet 7; the concentrated dewatered sludge water inlet 1 and the concentrated dewatered sludge water discharge port 2 are arranged on the lower side of the filter assembly 3, and the concentrated dewatered The sludge water filter outlet 4 is arranged on the upper side of the filter assembly 3 . The filter assembly 3 is a filter net. The filter screen is a double-layer structure, the lower side is a 150-mesh filter screen, and the upper side is a 500-mesh filter screen. The filtering unit A is a cone, the mixing reaction unit B and the precipitation unit C share the same cone, and the bottom of the mixing reaction unit B communicates with the precipitation unit C. The stirrer 6 is a three-blade paddle stirrer.

The specific steps of using the reactor to treat the advanced dewatered sludge water and the concentrated dewatered sludge water are as follows:

The concentrated dewatered sludge water first enters the filter unit A from the concentrated dewatered sludge water inlet 1 and flows from bottom to top, and passes through the filter assembly 3 (small pore filter), and the large particles in the concentrated dewatered sludge water can be removed in this unit. Direct sedimentation, small particles can be removed by filtering through a small-diameter filter, and discharged from the concentrated dewatered sludge water outlet 2.

The concentrated dewatered sludge water filtered water enters the mixed reaction unit B from the concentrated dewatered sludge water filtered outlet 4, and the deep dewatered sludge water is pumped into the mixed reaction unit B from the deep dewatered sludge water inlet 5 according to a certain flow rate. Under the agitation of the three-blade paddle agitator, the temperature field and concentration field are mixed quickly and uniformly, and after a certain hydraulic retention time, they fully react, and the Ca ²⁺ in the deep dewatered sludge water and the PO in the concentrated dewatered sludge water are filtered out. ₄ ^3- Precipitation reaction occurs, and part of organic matter will be removed through cooperative precipitation.

In the sedimentation unit C, the sediment formed by the reaction of the concentrated dewatered sludge water and the deep dewatered sludge water will settle under the action of gravity and be discharged through the sediment collection port 8. The supernatant is purified sludge water, which is obtained from the purification The sludge water is discharged from outlet 7 and enters the follow-up system.

Example 2

Utilizing the reactor for the integrated treatment of deep dewatered sludge water and concentrated dewatered sludge water described in Example 1, a field test of deep dewatered sludge water treatment concentrated dewatered sludge water was carried out at Shanghai Bailonggang Wastewater Treatment Plant. The water treatment volume of dewatered sludge water is 200L/d. The concentrations of orthophosphorus in concentrated dewatered sludge water and deep dewatered sludge water were 10.32mg/L and 0.08mg/L, and the concentrations of Ca ²⁺ were 72.54mg/L and 3057.11mg/L respectively. The concentrated dewatered sludge water enters the filter unit A from the concentrated dewatered sludge water inlet 1, first passes through a 150-mesh micro-mesh, and then is filtered through a 500-mesh micro-mesh, the hydraulic retention time is 30 minutes, and the sludge discharge cycle is 2 hours. The concentrated dewatered sludge water filtered water enters the mixed reaction unit B from the concentrated dewatered sludge water filtered outlet 4, and the deep dewatered sludge water entered from the deep dewatered sludge water inlet 5 is in the third phase of stirring intensity G = 100s ^-1 Mix evenly under a paddle agitator, and the hydraulic retention time is 30min. The phosphorus-containing solid product generated after the reaction enters the precipitation unit C under the action of gravity and hydraulic conditions, and the solid and liquid are separated. The solid precipitate accumulates at the bottom and is discharged from the sediment collection port 8. The sludge discharge period is 4 hours. The purified sewage after the reaction is The muddy water enters and exits through the outlet 7 of the purified sludge water, and the hydraulic retention time is 45 minutes.

Under different volume ratios of deep dewatered sludge water and concentrated dewatered sludge water, the conventional technology and the reactor are used for integrated treatment of deep dewatered sludge water and concentrated dewatered sludge water,

The traditional concentrated dewatering technology treatment refers to: After adding coagulants such as aluminum salt, iron salt or polyacrylamide to the concentrated dewatered sludge water, the concentrated dewatered sludge water is treated by stirring reaction and sediment deposition. . This technology not only needs to add a large amount of chemicals, but also the suspended matter in the sludge liquid will cause the phosphorus removal efficiency to drop, and a large amount of sludge flocs will enter the sediment, resulting in a low phosphorus content in the sediment.

The dephosphorization efficiency of concentrated dewatered sludge water before and after solid-liquid separation using deep dewatered sludge water treatment is shown in Figure 2. The abscissa in the figure: deep/concentrated represents the volume ratio of deep dewatered sludge water to concentrated dewatered sludge water, Raw water refers to concentrated dewatered sludge water without solid-liquid separation treatment, and supernatant refers to concentrated dewatered sludge water after solid-liquid separation treatment.

The phosphorus removal efficiency of the supernatant liquid obtained by treating two kinds of sludge water with the integrated reactor is obviously higher than the phosphorus removal efficiency of the traditional sludge water mixture containing high concentration of suspended matter. When the volume ratio of deep dewatered sludge water to concentrated dewatered sludge water is 8%, the phosphorus removal efficiency increases from 82.4% to _92.2 % after adding filter components, and the phosphorus content of the generated sediment (calculated as _P2O5 ) increases from 10.3% Increased to 16.8%, the increase of phosphorus content in sediment is more conducive to the resource utilization of phosphorus.

The foregoing is only an example of the embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and Modifications should also be regarded as the scope of protection of the present invention.

Claims (4)

1. the reactor of close-coupled processing deep dehydration sludge water and thickening sludge water, it is characterized in that, this reactor comprises the filtering unit of integrated setting, hybrid reaction unit and precipitation unit, described filtering unit is provided with thickening sludge water water-in, thickening sludge water mud discharging mouth, filter assemblies and thickening sludge water and filters out the mouth of a river, described hybrid reaction unit is provided with deep dehydration sludge water water-in and agitator, and described precipitation unit is provided with throw out and collects mouth and the outlet of purification sludge water;

Described filtering unit, hybrid reaction unit and precipitation unit are arranged side by side;

Described thickening sludge water water-in and thickening sludge water mud discharging mouth are located at the downside of filter assemblies, and described thickening sludge water filters out the upside that the mouth of a river is located at filter assemblies;

Described filtering unit is a cone-shaped body, and described hybrid reaction unit and precipitation unit share a cone-shaped body, and the bottom of hybrid reaction unit is communicated with precipitation unit;

Thickening sludge water enters into filtering unit from thickening sludge water water-in, after filtration after components apart, particulate matter is trapped, and discharge from thickening sludge water mud discharging mouth, thickening sludge water filtration water outlet filters out the mouth of a river from thickening sludge water and enters into hybrid reaction unit, react with the deep dehydration sludge water mix and blend entered from deep dehydration sludge water water-in, the precipitation formed is collected mouth by throw out and is discharged, supernatant liquor is purification sludge water, discharges from the outlet of purification sludge water.

2. the reactor of close-coupled processing deep dehydration sludge water according to claim 1 and thickening sludge water, is characterized in that, described filter assemblies is filtering net.

3. the reactor of close-coupled processing deep dehydration sludge water according to claim 2 and thickening sludge water, is characterized in that, described filtering net is bilayer structure, and downside is 150 order filtering nets, and upside is 500 order filtering nets.

4. the reactor of close-coupled processing deep dehydration sludge water according to claim 1 and thickening sludge water, is characterized in that, described agitator is three blade propeller agitator.