CN213012311U - Desulfurization waste water mud innocent treatment device - Google Patents

Abstract

The utility model relates to a desulfurization wastewater sludge innocent treatment device, which comprises a wastewater treatment system, a sludge treatment system and a dosing system; the wastewater treatment system comprises a wastewater tank, a modification tank, a clarifier and a water outlet tank which are connected in sequence; the sludge treatment system comprises a sludge pump, a filter press and a solidification bin which are connected in sequence, wherein the sludge pump is connected with the bottom of the clarifier; the drug adding system comprises a modifier drug adding device and a curing agent drug adding device, and the modifier drug adding device is connected with the modification box; the curing agent dosing device is connected with the curing bin. The utility model adopts the modification box and the inorganic nonmetal modification agent to replace the triple box and three agents of the prior device, can effectively deposit suspended matters and heavy metals in wastewater into sludge, and simultaneously improves the settling property of the sludge; the solidification bin and the inorganic nonmetal solidification agent are adopted to carry out harmless treatment on the sludge generated by treating the desulfurization wastewater, and the inorganic nonmetal solidification agent has good solidification effect on heavy metals in the sludge.

Description

Desulfurization waste water mud innocent treatment device

Technical Field

The utility model relates to a waste water and sludge treatment technical field, concretely relates to desulfurization waste water of power plant and sludge treatment equipment.

Background

During the operation of the wet desulphurization system of the coal-fired power plant, a certain amount of desulphurization wastewater needs to be discharged from the system so as to ensure the stable operation of the system. The desulfurization wastewater is characterized by acidic pH (4-6), high content of suspended matters and containing various heavy metals, and the environment is polluted if the desulfurization wastewater is directly discharged. The existing typical desulfurization wastewater treatment device adopts a neutralization-precipitation-flocculation-clarification (namely a triple box and a clarifier) process by gradually adding Ca (OH)₂Neutralization, organic sulfur (TMT-15) precipitation and flocculating agent coagulation, so that suspended matters and heavy metal ions in the wastewater are removed due to precipitation, and the standard discharge is realized. From the actual operation condition, the sludge-water separation effect in clarifiers of many power plants is poor, the effluent water is difficult to reach the standard, and the subsequent treatment of the sludge is also influenced.

The sludge treatment is an important component of the desulfurization wastewater treatment project, the existing desulfurization wastewater treatment device is often provided with a set of dehydration equipment, sludge generated by wastewater treatment is dehydrated and then transported to the outside for landfill, the water content after dehydration is generally 55-65%, the water content of sludge of partial power plants is difficult to meet the landfill standard, and the transportation difficulty is large. In addition, all gathering to mud after the heavy metal in the desulfurization waste water is handled, the secondary pollution problem of mud has not yet been regarded as important, and current device does not carry out innocent treatment to this mud, has certain environmental pollution risk.

Chinese patent CN205088035U discloses a novel desulfurization wastewater treatment system, wherein a clarifier is not arranged behind a triple box, and the treated desulfurization wastewater directly enters a centrifugal dehydrator for mud-water separation, so that the problems of poor mud-water separation effect and difficulty in standard reaching of effluent of the conventional device are solved; although the system can realize the standard reaching of the wastewater, the energy consumption of the centrifugal machine is high, 50-60% of suspended matters still exist in the separation liquid, and the separation liquid can be discharged after being filtered, so the operation cost is greatly increased.

Chinese patent CN204058115U discloses a desulfurization wastewater treatment system, wherein a spiral drying unloader is arranged below a mud bucket of a filter press and used for drying sludge after filter pressing, so that the problems of high sludge water content and high transfer difficulty of the conventional device are solved; although the system can reduce the water content of the sludge to 15%, the heating and evaporation needs a large amount of heat, and the operation cost is high.

Chinese patent CN207468440U discloses a chemical extraction system for heavy metals in desulfurization wastewater sludge, which is characterized in that after sludge is dried in the air, heavy metals in the sludge are extracted by using a chelating agent, so that the problems that the sludge is not subjected to harmless treatment and has pollution risk in the existing device are solved; although the system can realize the removal of heavy metals in the sludge, a large amount of acid and alkali is needed for adjusting the pH value in the extraction process, and the heavy metals in the sludge are extracted into the solution which still needs to be subjected to harmless treatment, so that the economy and the environmental protection are poor.

In summary, in order to achieve the standard discharge of the desulfurization waste water and the harmlessness of the sludge, it is necessary to improve the existing desulfurization waste water treatment device.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing a desulfurization waste water mud innocent treatment device to the not enough of above-mentioned prior art existence, its simple structure, and the medicament is with low costs, and it is up to standard to go out water stabilization of water quality, and mud does not have heavy metal pollution and moisture content and is less than 25%, reduces the follow-up expense of handling of mud by a wide margin, has good environmental benefit and economic benefits.

The utility model discloses a solve the technical scheme that technical problem that the aforesaid provided adopted and be:

a desulfurization wastewater sludge innocent treatment device comprises a wastewater treatment system, a sludge treatment system and a dosing system; the wastewater treatment system comprises a wastewater tank, a modification tank, a clarifier and a water outlet tank which are connected in sequence; the sludge treatment system comprises a sludge pump, a filter press and a solidification bin which are connected in sequence, and the sludge pump is connected with the bottom of the clarifier; the chemical adding system comprises a modifier chemical adding device filled with an inorganic non-metal modified chemical and a curing agent chemical adding device filled with an inorganic non-metal curing chemical, and the modifier chemical adding device is connected with the modification box; the curing agent dosing device is connected with the curing bin.

In the scheme, a lifting pump is arranged between the wastewater tank and the modification tank, and the desulfurization wastewater in the wastewater tank is conveyed into the modification tank through the lifting pump.

In the scheme, the lower part of the modification box is provided with a water inlet, and the desulfurization wastewater continuously enters the modification box through the water inlet at the lower part; the upper part of the modification tank is provided with an overflow port, and the overflow port is connected with the clarifier through an overflow pipeline; and after the desulfurization wastewater reacts with the inorganic nonmetal modification agent in the modification box, the desulfurization wastewater enters the clarifier through an overflow pipeline.

In the scheme, the upper part of the clarifier is provided with an overflow port, and the overflow port is connected with the water outlet tank through an overflow pipeline; and carrying out mud-water separation on reaction products in the modification tank in the clarifier, discharging upper clarified liquid into the water outlet tank through an overflow pipeline, and discharging lower sludge into the filter press under the action of the sludge pump.

In the scheme, a stirrer is arranged in the modification tank.

In the scheme, the curing bin is internally provided with the stirring mixer.

The beneficial effects of the utility model reside in that:

1. adopt modified case and inorganic nonmetal modified medicament to replace the triplex case and the three kinds of medicaments of current device, can effectually deposit suspended solid and heavy metal in the waste water to mud, improve the settlement performance of mud simultaneously, improve the treatment effeciency of clarifier, make the play water satisfy the requirement of "lime stone-gypsum wet flue gas desulfurization waste water quality control index (DL/T997-2006) of thermal power plant.

2. The sludge generated by treating the desulfurization wastewater is subjected to harmless treatment by adopting the curing bin and the inorganic non-metal curing agent, so that the heavy metal in the sludge is well cured, the concentration of the heavy metal in the treated sludge meets the requirements of the first-level standard of Integrated wastewater discharge Standard (GB 8978-.

3. The utility model discloses desulfurization waste water mud innocent treatment device simple structure, the medicament is with low costs, and modified medicament handles the moisture content behind the mud filter-pressing that produces and can fall to below 45%, handles again through the solidification medicament and can further reduce to below 25%, and the mud volume reduces correspondingly by a wide margin, further reduces the subsequent transportation degree of difficulty of mud and handles the expense, saves the cost effectively.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

FIG. 1 is a structural diagram of the harmless treatment device for desulfurization waste water and sludge of the present invention.

In the figure: 1. a wastewater tank; 2. a lift pump; 3. a modification box; 4. a clarifier; 5. a water outlet tank; 6. a sludge pump; 7. a filter press; 8. a curing bin; 9. a modifier dosing device; 10. curing agent charge device.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in figure 1, the utility model provides a harmless treatment device for desulfurization wastewater and sludge, which comprises a wastewater treatment system, a sludge treatment system and a dosing system.

The wastewater treatment system comprises a wastewater tank 1, a lifting pump 2, a modification tank 3, a clarifier 4 and a water outlet tank 5 which are connected in sequence. The lower part of the modification tank 3 is provided with a water inlet, the upper part of the modification tank is provided with an overflow port, the overflow port is connected with the clarifier 4 through an overflow pipeline, the desulfurization wastewater continuously enters the modification tank 3, the overflow port continuously discharges water to the clarifier 4, and the reaction time is controlled through overflow. The upper part of the clarifier 4 is provided with an overflow port which is connected with a water outlet tank 5 through an overflow pipeline. The sludge treatment system comprises a sludge pump 6, a filter press 7 and a solidification bin 8 which are connected in sequence. A sludge pump 6 is connected to the bottom of the clarifier 4. The dosing system comprises a modifier dosing device 9 filled with an inorganic non-metal modified medicament and a curing agent dosing device 10 filled with an inorganic non-metal curing medicament, wherein the modifier dosing device 9 is connected with the modification box 3, and the curing agent dosing device 10 is connected with the curing bin 8.

Desulfurization waste water enters a modification box 3 from a waste water box 1 through a lifting pump 2, a modifier dosing device 9 is started, an inorganic non-metal modification agent is added into the desulfurization waste water in the modification box 3, a stirrer is arranged in the modification box 3, the desulfurization waste water enters a clarifier 4 through an overflow pipeline after fast reaction, mud-water separation is carried out in the clarifier 4, upper clarified liquid is discharged into a water outlet box 5 through the overflow pipeline, and the waste water is discharged after reaching the standard. Inorganic nonmetal modified reagent reacts with desulfurization waste water at the quick mixing in modification case 3, can get rid of suspended solid and heavy metal in the waste water, improves the settlement performance and the dewatering performance of mud in the waste water simultaneously.

Sludge generated by desulfurization wastewater treatment is deposited on the lower portion of a clarifier 4, is conveyed to a filter press 7 through a sludge pump 6, is discharged into a curing bin 8 after being dehydrated through the filter press 7, a curing agent dosing device 10 is started, an inorganic nonmetal curing agent is added into the sludge in the curing bin 8, a stirring mixer is arranged in the curing bin 8, and after being fully mixed, the sludge is transported to a rain-sheltering place to be stockpiled for 1-5 days and then is transported to the outside for landfill, so that harmless discharge of the sludge is realized. The inorganic nonmetal curing agent and the sludge are fully mixed and reacted in the curing bin 8, so that the leaching concentration of heavy metals in the sludge can be reduced, and the water content of the sludge is further reduced.

In this embodiment, the inorganic nonmetal modifying agent uses slag and slag composition as main raw materials, and a proper amount of gypsum and master batch as an activating agent.

The utility model discloses the device adopts modified case 3 and inorganic non-metal modified medicament to replace the triplex case and the three kinds of medicaments of current device, can be effectual with the suspended solid and the heavy metal precipitation in the waste water to mud, improve the settlement performance of mud simultaneously, improve clarifier 4's treatment effeciency, make the water outlet satisfy the requirement of "thermal power plant limestone-gypsum wet flue gas desulfurization waste water quality control index (DL/T997-2006)".

Further optimized, in this embodiment, the inorganic non-metal curing agent is mixed and ground from the following components in the following weight mixing ratio to 400-900m of Boehringer specific surface area²Kg make:

slag or slag composition: 78% -85%;

an alkali activator: 10% -25%;

surfactant (b): 0.01 to 0.15 percent.

Wherein, the water content of the slag or the slag composition is less than 4 percent, and the slag composition is one or a plurality of combinations of the slag, ferrochromium slag, phosphorus slag, silicomanganese slag, fly ash and other industrial waste residues. The alkali activator is Na₂CO₃、NaOH、Na₂SO₄、KAl(SO₄)₂·6H₂O、K₂NO₂、NaF、K₂CO₃Or with cement clinker. The surfactant is one or more of triethanolamine, sulfite pulp waste liquid, sodium acetate, sodium lignosulfonate and calcium lignosulfonate, or is compounded with urea.

The utility model discloses a solidification storehouse 8 and inorganic nonmetal solidification medicament carry out innocent treatment to the mud that handles desulfurization waste water and produce, have fine solidification effect to the heavy metal in the mud, and the heavy metal concentration of handling back mud satisfies the requirement of "integrated wastewater discharge standard (GB 8978-.

The utility model discloses desulfurization waste water mud innocent treatment device simple structure, the medicament is with low costs, and modified medicament handles the moisture content behind the mud filter-pressing that produces and can fall to below 45%, handles again through the solidification medicament and can further reduce to below 25%, and the mud volume reduces correspondingly by a wide margin, further reduces the subsequent transportation degree of difficulty of mud and handles the expense, saves the cost effectively.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (6)

1. A desulfurization wastewater sludge innocent treatment device is characterized by comprising a wastewater treatment system, a sludge treatment system and a dosing system; the wastewater treatment system comprises a wastewater tank, a modification tank, a clarifier and a water outlet tank which are connected in sequence; the sludge treatment system comprises a sludge pump, a filter press and a solidification bin which are connected in sequence, and the sludge pump is connected with the bottom of the clarifier; the chemical adding system comprises a modifier chemical adding device filled with an inorganic non-metal modified chemical and a curing agent chemical adding device filled with an inorganic non-metal curing chemical, and the modifier chemical adding device is connected with the modification box; the curing agent dosing device is connected with the curing bin.

2. The desulfurization wastewater sludge innocent treatment device according to claim 1, wherein a lift pump is provided between the wastewater tank and the modification tank, and desulfurization wastewater in the wastewater tank is conveyed into the modification tank by the lift pump.

3. The desulfurization wastewater sludge innocent treatment device of claim 1, wherein the lower part of the modification tank is provided with a water inlet, and desulfurization wastewater continuously enters the modification tank through the lower water inlet; the upper part of the modification tank is provided with an overflow port, and the overflow port is connected with the clarifier through an overflow pipeline; and after the desulfurization wastewater reacts with the inorganic nonmetal modification agent in the modification box, the desulfurization wastewater enters the clarifier through an overflow pipeline.

4. The desulfurization wastewater sludge innocent treatment device of claim 1 or 3, wherein the upper part of the clarifier is provided with an overflow port, and the overflow port is connected with the water outlet tank through an overflow pipeline; and carrying out mud-water separation on reaction products in the modification tank in the clarifier, discharging upper clarified liquid into the water outlet tank through an overflow pipeline, and discharging lower sludge into the filter press under the action of the sludge pump.

5. The apparatus for harmless treatment of desulfurization wastewater sludge according to claim 1, wherein a stirrer is provided in the modification tank.

6. The desulfurization wastewater sludge innocent treatment device of claim 1, wherein the solidification bin is provided with a stirring mixer.