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BD-A mechanical stirring accelerated clarifier

key word:Heat exchange element


Product description

BD-A mechanical stirring accelerated clarifier

 

1. Introduction

Bd-a mechanical agitation accelerated clarifier series is a new generation of products, which integrates the advanced technology of similar products. When the turbidity of raw water changes greatly due to seasonal influence, the effect of removing organic matters and colloidal silicon in water is better than other similar products. Bd-a mechanical agitation accelerated clarifier has the advantages of strong adaptability to the variation of turbidity and treatment capacity of raw water, large water yield, low water production cost, low mechanical equipment operation and maintenance workload.

 

2. Working principle

BD-A  Type a mechanical agitation accelerated clarifier belongs to the sludge circulation separation type clarifier. The mechanical agitator device installed on the same shaft and the lifting impeller are used to make the water flow into the first reaction chamber rotate slowly through the mixing blades, so that the impurities in the water can agglomerate and adsorb with the sludge, and keep the sludge in the suspension state, and then the sludge water is removed from the first reaction chamber by the lifting impeller It is lifted to the second reaction chamber, continues the coagulation reaction to form larger particles, and then comes out from the second reaction room and enters the separation area through the diversion chamber. In the separation zone, the area suddenly increases and the flow rate decreases. Under the action of separation and clarification of inclined tube packing, the floc flocs and the fresh water are separated by density difference. Part of the settled sludge is discharged through the sludge concentration chamber to maintain balance, and part of the sludge is continuously coagulated with the raw water in the tank through mixing and lifting devices.

 

3. Main technical parameters

BD-A mechanical agitation accelerated clarifier has the characteristics of high efficiency, stable operation and strong adaptability to the changes of raw water turbidity and treatment capacity.

3.1. Turbidity content of influent water: ≤ 20 ~ 3000mg / L

3.2. Turbidity content of effluent: ≤ 10mg / L

3.3. Short time influent turbidity: 5000mg / L

3.4. Short time effluent turbidity: < 20mg / L.

 

4. Instructions

4.1. Empty pool startup

The pool should be filled with water (at the same time, the dosage is 1-2 times higher than the normal operation value) and clay should be added properly to help the formation of sludge.

After the water is full, the water inflow should be reduced to 1 / 2 ~ 1 / 3 of the design water quantity. The water quantity should not be increased more than 20% of the design water quantity each time, and the interval of water increase should not be less than 1 h, until the design load is reached, the stable operation can be achieved.

When the turbidity of raw water is low, it is difficult to form sludge during start-up. The method of reducing the water inflow and increasing the dosage of chemicals can be adopted. When adding a certain amount of hydrated lime in the second reaction chamber, the floc can be formed in a short time and the sludge layer can be formed.

4.2. Time from start-up of empty pool to normal operation

When starting at low temperature and low turbidity, the normal effluent can be achieved within 2-3 h after adding some clay, which can reduce the water inflow and increase the dosage. In the case of high turbidity of raw water, the normal operation can be achieved in about 1 h under the condition of increasing the dosage of chemicals without adding clay and reducing the opening degree of mixer.

4.3. Position of dosing point

The dosing point should be set in front of the water inlet of the clarifier, followed by the first reaction chamber. If the user has the conditions, the agent can be added in front of the water pipe entering the clarifier. It has been proved by practice that raw water and chemicals are mixed quickly and fully to form flocs, and then contact with circulating activated sludge, the adsorption and coagulation effect is better.

4.4. Proper sludge discharge

It is required to achieve good effluent quality, less sludge accumulation at the bottom of the tank, less water consumption for sludge discharge and low treatment drug consumption. There are three methods to control the sludge discharge period. One is the sedimentation ratio control method. According to the sedimentation ratio of the sludge in the second reaction chamber for 5min, the concentration of the backflow sludge is generally controlled in the range of 5% - 20%, and most of them are 8% - 15%; The second is the sludge separation control method. Observe and control the height of the sludge layer on the separation surface. If the following conditions occur in the sludge separation, the sludge discharge is insufficient. The increase of sludge concentration in the first and second reaction chambers is accelerated, and the sludge in the separation area is gradually increased. The third is the timing sludge discharge control method (the number of sludge discharge is determined according to the long-term operation sampling and exploration rule). When the concentration is high, continuous sludge discharge is considered (but there is a large water consumption in sludge discharge) The disadvantages of).

4.5. Restart after shutdown

It is better to add chemicals to the first reaction chamber 0.5h before the water inflow to ensure the quality of effluent rapidly. During operation, continuous dosing should be made.

4.6. Chemical adding of the Clarifier

Before operation, the adjustment test of coagulant and coagulant aid should be carried out, and the dosage and type should be adjusted according to the seasonal or periodic changes of influent water quality.

 

5. Structure diagram of mechanical stirring accelerated clarifier

The structure of BD-A mechanical stirring accelerated clarifier is shown in Fig. 1-1.

 

6. nozzle size

See Table 1-1 for the nozzle size of BD-A mechanical stirring accelerated clarifier.

Table 1-1 nozzle table of BD-A mechanical stirring accelerated clarifier

 

Clarifier capacity LAt/h 6080 80100 100120 120200 200320
Cylinder outer diameter ∮(mm 6940 7460 7980 10200 13000
Concrete supporting wall1mm 7540 7960 8780 10800 13700
Total height Hm 7.7 8.2 8.5 8.5 8.75
 Tope height H1m 6.7 7.2 7.5 7.5 7.75
Outlet pipe height H2m 5.7 6.2 6.5 6.5 6.75
Height of sludge discharge pipe H3m 4.7 5.2 4.5 4.5 5.3
Height of supporting wall H4m 4.4 4.9 4.2 4.2 5
Counter current pipe height H5m 63.2 6.7 7 7 7.25
Water inlet pipe DN1(mm) 150 200 250 300 350
PN(MPa) 0.6 0.6 0.6 0.6 0.6
water outlet pipe DN2(mm) 200 250 300 350 400
PN(MPa) 0.6 0.6 0.6 0.6 0.6
Coagulant adding pipe DN3(mm) 20 20 20 25 25
PN(MPa) 0.6 0.6 0.6 0.6 0.6
Polymerization adding pipe DN4(mm) 20 20 20 25 25
PN(MPa) 0.6 0.6 0.6 0.6 0.6
Sludge pipe DN5(mm) 20 20 20 25 25
PN(MPa) 0.6 0.6 0.6 0.6 0.6
Sludge dischage pipe DN6(mm) 80 100 100 125 125
PN(MPa) 0.6 0.6 0.6 0.6 0.6
overflow pipe DN7(mm) 200 250 300 350 400
PN(MPa) 0.6 0.6 0.6 0.6 0.6
Vent pipe DN8(mm) 80 100 125 150 200
PN(MPa) 0.6 0.6 0.6 0.6 0.6