CN112551731A - Method for reducing wastewater treatment and reuse cost of hydroelectric engineering sandstone processing system - Google Patents
Method for reducing wastewater treatment and reuse cost of hydroelectric engineering sandstone processing system Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
Abstract
The invention discloses a method for reducing wastewater treatment and reuse cost of a hydroelectric engineering sandstone processing system. The method comprises the following steps: optimizing the water SS concentration target for the hydropower station engineering sandstone processing system; step two: collecting the production wastewater of the sandstone aggregate and sandstone processing system in a centralized manner, and feeding the wastewater into a regulating tank; step three: pre-precipitating the sewage in the regulating tank for a certain time, then feeding the sewage into a precipitation tank, and adding a flocculating agent into the precipitation tank to carry out precipitation treatment on the wastewater; step four: when the SS concentration in the supernatant of the sedimentation tank reaches the water target of the sand processing system determined in the step one, the supernatant enters a clean water tank; step five: and pumping the water in the clean water tank to a sand processing system through a pump station for recycling. The invention overcomes the defect of overhigh cost of recycling the treated wastewater; has the advantage of meeting the quality requirement of the aggregate.
Description
Technical Field
The invention relates to the field of wastewater water requirement, in particular to a method for reducing the treatment and recycling cost of the production wastewater of a hydroelectric engineering sandstone processing system.
Background
The water consumption of the hydroelectric engineering sandstone processing system is high, the production amount of wastewater is large, the main pollutants are SS, the concentration is basically more than 10000mg/L, and the highest concentration can reach 160000-220000 mg/L. Because of the high requirements on the sewage discharge standard in the current laws, regulations and specifications, the retention time of the production wastewater is long, the treatment cost is too high, and even part of the production wastewater of the sandstone processing system is directly discharged into a river without being treated. And part of the hydroelectric engineering is used for treating and recycling the production wastewater of the sand and stone processing system, so that water is saved, zero discharge of the wastewater can be realized, and the recycling of the production wastewater is the current trend.
According to design specifications of hydroelectric engineering sand and stone processing systems (DL/T5098-2010), the SS content of the production water standard of the sand and stone processing system is required to be less than 100 mg/L. However, according to on-site research, the actual recycling standard of many hydroelectric engineering sandstone processing systems is about 1000mg/L, which is far higher than the standard requirement. Because the water index SS concentration of the sandstone processing system is strictly controlled in the current standard requirements, the recycling cost of the treated wastewater is too high.
Therefore, there is a need to develop a method for reducing the wastewater treatment and recycling cost of the sand processing system in the hydroelectric engineering.
Disclosure of Invention
The invention aims to provide a method for reducing wastewater treatment and recycling cost of a hydroelectric engineering sandstone processing system, and provides a production wastewater treatment target and a treatment method which meet the quality requirement of sandstone aggregate, so that the treatment and recycling cost of the sandstone aggregate production wastewater is reduced, zero discharge of wastewater is realized, and the treatment and recycling method of the production wastewater of the hydroelectric engineering sandstone processing system is optimized.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for reducing wastewater treatment and reuse cost of a hydroelectric engineering sand and stone processing system is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
the method comprises the following steps: optimizing the water SS concentration target for the hydropower station engineering sandstone processing system;
step two: collecting the production wastewater of the sandstone aggregate and sandstone processing system in a centralized manner, and feeding the wastewater into a regulating tank;
step three: pre-precipitating the sewage in the regulating tank for a certain time, then feeding the sewage into a precipitation tank, and adding a flocculating agent into the precipitation tank to carry out precipitation treatment on the wastewater;
step four: when the SS concentration in the supernatant of the sedimentation tank reaches the water target of the sand processing system determined in the step one, the supernatant enters a clean water tank;
step five: and pumping the water in the clean water tank to a sand processing system through a pump station for recycling.
In the technical scheme, in the step one, a method for selecting the production wastewater meeting the quality of the hydroelectric engineering sandstone aggregate is adopted to select the SS concentration target of the production water of the hydroelectric engineering sandstone processing system;
the method for selecting the production wastewater meeting the quality of the hydroelectric engineering sandstone aggregate comprises the following steps:
s11: taking multiple samples of the production wastewater of the sand and stone processing system of the water and electricity engineering;
s12: respectively measuring the quality of the obtained production wastewater of the sand and stone processing system for multiple times, wherein the detection indexes are as follows: pH, SS, soluble substances, chloride and sulfate, and determining that the main water quality index for restricting the recycling of construction wastewater is SS;
s13: configuring configuration water samples with different SS concentrations between the upper limit and the lower limit of the SS concentration by taking the SS concentration in drinking water as the lower limit and taking the maximum value of the SS concentration in the sand processing system production wastewater detected by multiple samples as the upper limit;
wherein, the SS concentration gradient of the configured water sample is controlled according to the upper limit and the lower limit range:
when the SS concentration range is less than 2000mg/L, preparing a water sample with SS concentration gradient intervals of 100mg/L-500 mg/L;
when the SS concentration range is 2000mg/L-6000mg/L, preparing a water sample with SS concentration gradient intervals of 500mg/L-1000 mg/L;
when the SS concentration range is larger than 6000mg/L, preparing a water sample with SS concentration gradient intervals of 10000mg/L-30000 mg/L;
s14: taking sand samples produced by a sand processing system by using different SS (suspended solid) concentrations to prepare water samples;
s15: carrying out aggregate quality detection on the sand sample obtained in the step S14;
s16: establishing a corresponding relation between an SS concentration index and an aggregate quality index in a configured water sample, and determining stone powder content and fineness modulus index of the aggregate influenced by the SS concentration;
s17: selecting an SS concentration range meeting the aggregate quality requirement, and taking the maximum value of the SS concentration in the range or the SS concentration corresponding to the aggregate quality requirement as the water SS concentration target for the sand processing system.
In the technical scheme, in the third step, the flocculating agent is PAM and PAC; the concentrations of PAM and PAC in the sedimentation tank were 3mg/L and 300mg/L, respectively.
In the technical scheme, in the third step, the retention time of the waste water of the sandstone processing production system in the sedimentation tank is 2 hours.
In the above technical solution, in S15, the aggregate quality detection content includes apparent density, stone powder content, fineness modulus, clod content, organic matter content, sulfide content, and sulfate content.
In the technical scheme, in S17, when the SS concentration in the prepared water sample is controlled within 6000mg/L, each detection index in the processed sand sample meets the aggregate quality requirement, the stone powder content is 6-18%, and the fineness modulus is less than or equal to 2.9.
In the technical scheme, in S17, when the SS concentration in the prepared water sample is controlled within 2000mg/L, each detection index in the processed sand sample meets the aggregate quality requirement, the stone powder content is 12% -18%, and the fineness modulus is less than or equal to 2.8.
The SS is the Suspended solids concentration and is an abbreviation for Suspended solid, in units of: mg/L; the suspended matter refers to solid matter suspended in water, including inorganic matter, organic matter, silt, clay, microbe, etc. insoluble in water.
The invention has the following advantages:
(1) the invention provides a method for researching the water standard of a hydroelectric engineering sandstone processing system, provides the aim of SS treatment of production wastewater of the hydroelectric engineering sandstone processing system, breaks through the current standard requirement, and can reduce the treatment cost of the production wastewater of the sandstone processing system; the defects that the concentration of the water index SS for the sandstone processing system is strictly controlled and the cost for recycling the wastewater after treatment is overhigh in the current standard requirements are overcome;
(2) the invention provides a method for treating and recycling production wastewater of a hydroelectric engineering sandstone processing system, and provides the optimal concentration configuration of the retention time of the wastewater in a sedimentation tank and the addition of a flocculating agent under the SS treatment target determined by the method, so that the purposes of reaching the standard of wastewater treatment and reducing the sludge production are achieved.
Drawings
FIG. 1 is a graph showing the relationship between the fineness modulus of sand produced in example 1 of the present invention and the SS concentration in process water.
FIG. 2 is a graph showing the relationship between the stone dust content of the sand produced in example 1 of the present invention and the SS concentration in the process water.
FIG. 3 is a graph showing the effect of SS sedimentation in wastewater after different concentrations of PAC and PAM flocculants were added in example 1 of the present invention.
FIG. 4 is a process flow diagram of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily understood by the description.
By optimizing the requirement of SS concentration in the production water of the sand and stone processing system, the invention can reduce the treatment cost of the waste water of sand and stone processing production, reduce the retention time of sewage, improve the cyclic utilization rate of the waste water of the sand and stone processing system and reduce the discharge amount of the waste water of production. The specification of Hydraulic concrete construction (DL/T5144-. Therefore, the inventor finds that the SS index of the production water of the sand processing system has a space for further optimization by combining the water quality requirements of the actual water quality of the sand processing system on the construction site and the content of the insoluble matters in the concrete mixing water.
A method for reducing the cost of wastewater treatment and reuse of a hydroelectric engineering sandstone processing system, which comprises the following steps,
the method comprises the following steps: optimizing the water SS concentration target for the hydropower station engineering sandstone processing system;
step two: collecting the production wastewater of the sandstone aggregate and sandstone processing system in a centralized manner, and feeding the wastewater into a regulating tank;
step three: pre-precipitating the sewage in the regulating tank for a certain time, then feeding the sewage into a precipitation tank, and adding a flocculating agent into the precipitation tank to carry out precipitation treatment on the wastewater;
step four: when the SS concentration in the supernatant of the sedimentation tank reaches the water target of the sand processing system determined in the step one, the supernatant enters a clean water tank;
step five: the water in the clean water tank is pumped to a sand processing system through a pump station for recycling (as shown in figure 4).
Further, in the step one, selecting the SS concentration target of the production water of the hydroelectric engineering sandstone processing system by adopting a method for selecting the production wastewater meeting the quality of the hydroelectric engineering sandstone aggregate, and taking the SS concentration target as the treatment target of the SS of the production wastewater of the hydroelectric engineering sandstone processing system;
the method for selecting the production wastewater meeting the quality of the hydroelectric engineering sandstone aggregate specifically comprises the following steps:
s11: taking multiple samples of the production wastewater of the sand and stone processing system of the water and electricity engineering;
s12: respectively measuring the quality of the obtained production wastewater of the sand and stone processing system for multiple times, wherein the detection indexes are as follows: pH, SS, soluble substances, chloride and sulfate, and determining that the main water quality index for restricting the recycling of construction wastewater is SS;
s13: configuring configuration water samples with different SS concentrations between the upper limit and the lower limit of the SS concentration by taking the SS concentration in drinking water as the lower limit and taking the maximum value of the SS concentration in the sand processing system production wastewater detected by multiple samples as the upper limit;
wherein, the SS concentration gradient of the prepared water sample can be controlled according to the upper limit and the lower limit range:
when the SS concentration range is less than 2000mg/L, preparing a water sample with SS concentration gradient intervals of 100mg/L-500 mg/L;
when the SS concentration range is 2000mg/L-6000mg/L, preparing a water sample with SS concentration gradient intervals of 500mg/L-1000 mg/L;
when the SS concentration range is larger than 6000mg/L, preparing a water sample with SS concentration gradient intervals of 10000mg/L-30000mg/L, and specifically optimizing according to actual conditions;
s14: taking sand samples produced by a sand processing system by using different SS (suspended solid) concentrations to prepare water samples;
s15: carrying out aggregate quality detection on the sand sample obtained in S14 according to DL/T5151-2014 'Hydraulic concrete sandstone aggregate experiment specification'; determining main indexes influencing aggregate quality to be stone powder content and fineness modulus after water with different SS contents is used for processing sandstone by a selection method of production wastewater meeting the quality of hydroelectric engineering sandstone aggregate;
s16: establishing a corresponding relation between an SS concentration index and an aggregate quality index in a configured water sample, and determining stone dust content and fineness modulus index (shown in figures 1 and 2) of the aggregate mainly influenced by the SS concentration; water with different SS concentrations has little influence on quality parameters such as apparent density, organic matter content, sulfide and sulfate content and the like of the washed sand, but has great influence on fineness modulus and stone powder content of the sand;
s17: selecting an SS concentration range meeting the aggregate quality requirement, and taking the maximum value of the SS concentration in the range or the corresponding SS concentration when the aggregate quality requirement is better as the water SS concentration target for the sand processing system.
Further, in step three, the flocculating agent is PAM (polyacrylamide) and PAC (polyaluminium chloride); the concentrations of PAM and PAC in the sedimentation tank are respectively 3mg/L and 300mg/L, and the sedimentation effect on the waste water of the sandstone processing production system is better (as shown in figure 3).
Furthermore, in the third step, the retention time of the waste water of the sandstone processing production system in the sedimentation tank is 2 hours, so that the quality requirement of sandstone aggregates is met.
Further, in the fourth step, the concentration range of the SS treatment target of the wastewater produced by the hydroelectric engineering sandstone processing system is 100 mg/L-6000mg/L, and the better treatment target is 2000 mg/L.
Further, in S15, the aggregate quality detection content includes apparent density, stone powder content, fineness modulus, clod content, organic matter content, and mass content percentage of sulfide and sulfate.
Further, in S17, the SS concentration of the water sample corresponding to 6% to 18% of the stone powder content of the aggregate is taken as the range meeting the requirement of the aggregate quality, the SS concentration of the water sample corresponding to 12% to 18% of the stone powder content is taken as the range with better aggregate quality, the SS concentration of the water sample corresponding to 2.9 or less of the fineness modulus is taken as the range meeting the requirement of the aggregate quality, and the SS concentration of the water sample corresponding to 2.8 or less of the fineness modulus is taken as the range with better aggregate quality (as shown in fig. 1 and 2);
in S17, when the SS concentration in the prepared water sample is controlled within 6000mg/L, each detection index in the processed sand sample meets the aggregate quality requirement, the stone powder content is 6-18%, and the fineness modulus is less than or equal to 2.9.
Further, in S17, when the SS concentration in the prepared water sample is controlled within 2000mg/L, each detection index in the processed sand sample meets the requirement of better aggregate quality, the stone powder content is 12% to 18%, and the fineness modulus is less than or equal to 2.8 (as shown in fig. 1 and 2).
In S17, determining that the SS concentration of the water for the hydroelectric engineering sandstone processing system is less than or equal to 6000mg/L and meets the water requirement of the sandstone processing system, and when the SS concentration is controlled to be about 2000mg/L, the quality of the produced sandstone aggregate is better.
The sandstone aggregate comprises granite, limestone and the like.
Examples
The invention is explained in detail by taking the embodiment of the treatment and the recycling of the production wastewater of the hydroelectric engineering sandstone processing system applied to a certain sandstone aggregate source as an example, and has the same guiding function on the treatment and the recycling of the production wastewater of the hydroelectric engineering sandstone processing system applied to other sandstone aggregate sources.
Example 1
The sandstone aggregate source in this example is granite.
The method comprises the following steps: taking granite as a sandstone aggregate source, and taking multiple samples of industrial wastewater of an hydroelectric engineering sandstone processing system;
step two: respectively measuring the quality of the obtained production wastewater of the sand and stone processing system for multiple times, wherein the detection indexes are as follows: pH, SS, soluble substances, chloride and sulfate, and the detection result is as follows: the SS concentration in the initial wastewater is between 60000-140000mg/L, the soluble substance concentration range is 298-442mg/L, the sulfate concentration range is 15.07-31.83mg/L, the chloride concentration range is 41.91-71.78mg/L, the pH, the soluble substance, the chloride and the sulfate are all less than the water standard of a sand processing system (the current standard of water for the sand processing system), the water quality requirement is met, and the main water quality index for restricting the recycling of the construction wastewater is determined to be SS;
step three: configuring prepared water samples with different SS concentrations between the upper limit and the lower limit of SS concentration for hydroelectric engineering sand processing by taking the SS concentration in drinking water as the lower limit and taking the maximum value of the SS concentration in the sand processing system production wastewater detected by multiple samples as the upper limit, and respectively configuring the SS concentrations to be 28mg/L, 100mg/L, 200mg/L, 500mg/L, 1000mg/L, 1500mg/L, 2000mg/L, 4000mg/L, 6000mg/L, 8000mg/L, 10000mg/L, 20000mg/L, 50000mg/L, 70000mg/L, 100000mg/L, 120000mg/L and 140000 mg/L;
step four: taking sand samples produced by a sand processing system by using different SS (suspended solid) concentrations to prepare water samples;
step five: carrying out aggregate quality detection on the sand sample obtained in S14, wherein the detection indexes are apparent density, stone powder content, fineness modulus, mud block content, organic matter content, sulfide and sulfate content, and the apparent density range is 2690 kg/m-3The content of stone powder is 11.7 to 16.8 percent, the fineness modulus is 2.8 to 3.1, the content of mud blocks is 0 percent, the content of organic matters is lighter than the standard color, the content of sulfide and sulfate is 0.15 to 0.17 percent, and the rest meets the quality requirement of the sandstone aggregate except the content of the stone powder and the fineness modulus by contrasting the Hydraulic concrete construction Specification (DL/T5144-;
step six: establishing a corresponding relation (shown in figures 1 and 2) between an SS concentration index and an aggregate quality index in a configured water sample, and determining stone dust content and fineness modulus index of the aggregate which are mainly influenced by the SS concentration;
step seven: selecting an SS concentration range meeting the aggregate quality requirement, when the SS concentration in a prepared water sample is controlled within 6000mg/L, each detection index in the processed sand sample meets the aggregate quality requirement, the stone powder content is 12-18%, and the fineness modulus is less than or equal to 2.9, when the SS concentration in the prepared water sample is controlled within 2000mg/L, each detection index in the processed sand sample meets the better aggregate quality requirement, the stone powder content is 12-18%, and the fineness modulus is less than or equal to 2.8;
thereby determining that the concentration of SS (suspended solid) in water for a hydroelectric engineering sandstone processing system is less than or equal to 6000mg/L to meet the requirement of the water for the sandstone processing system, and taking the concentration of SS (suspended solid) less than or equal to 2000mg/L as a better target of the concentration of SS in water for the sandstone processing system; comprehensively considering, 2000mg/L is selected as the SS treatment target in the production water of the sand processing system in the project;
step eight: collecting the production wastewater of the sandstone aggregate and sandstone processing system in a centralized manner, and feeding the wastewater into a regulating tank;
step nine: precipitating the sewage in the regulating tank for 1h, then feeding the sewage into a precipitation tank, precipitating the wastewater in the precipitation tank by adding PAM with the concentration of 3mg/L and PAC flocculant with the concentration of 300mg/L respectively, wherein the retention time of the wastewater of the sandstone processing production system in the precipitation tank is 2 h;
step ten: when the concentration of SS in the supernatant of the sedimentation tank reaches 2000mg/L, the supernatant enters a clean water tank;
step eleven: the water in the clean water tank is pumped to a sand processing system through a pump station for recycling (as shown in figure 4).
And (4) conclusion: the embodiment reduces the treatment cost of the production wastewater of the granite processing system, realizes zero discharge of wastewater, and achieves the purposes of reaching the standard of wastewater treatment and reducing the sludge production.
Example 2
The sandstone aggregate source in this example is limestone.
The method comprises the following steps: taking limestone as a sandstone aggregate source, and taking multiple samples of industrial wastewater of a sand and electricity engineering sand processing system;
step two: respectively measuring the quality of the obtained production wastewater of the sand and stone processing system for multiple times, wherein the detection indexes are as follows: the detection result is that the SS concentration in the initial wastewater is 20000-70000mg/L, the soluble substance concentration range is 200-500mg/L, the sulfate concentration range is 16-32mg/L, the chloride concentration range is 50-62mg/L, the pH, the soluble substance, the chloride and the sulfate are all less than the water standard of a sandstone processing system (the current standard of water for the sandstone processing system), the water quality requirement is met, and the main water quality index restricting the recycling of construction wastewater is determined to be SS;
step three: taking the SS concentration in drinking water as a lower limit, and taking the maximum value of the SS concentration in the sand processing system production wastewater detected by multiple samples as an upper limit;
wherein, the configuration water sample of different SS concentrations that the configuration is in between SS concentration upper limit and the lower limit is used for the water and electricity engineering sandstone processing: respectively configuring SS concentrations of 28mg/L, 100mg/L, 200mg/L, 500mg/L, 1000mg/L, 1500mg/L, 2000mg/L, 4000mg/L, 6000mg/L, 8000mg/L, 10000mg/L, 20000mg/L, 50000mg/L and 70000 mg/L;
step four: taking sand samples produced by a sand processing system by using different SS (suspended solid) concentrations to prepare water samples;
step five: carrying out aggregate quality detection on the sand sample obtained in the step S14, wherein the detection indexes comprise apparent density, stone powder content, fineness modulus, mud block content, organic matter content, sulfide and sulfate content, and the apparent density is more than or equal to 2500kg/m3The content of the stone powder is 10 to 14 percent, the fineness modulus is 2.6 to 3.2, the content of the mud blocks is 0 percent, the content of organic matters is lighter than the standard color, the content of sulfides and sulfates is less than or equal to 1, and the rest meets the quality requirement of the sandstone aggregate except the fineness modulus by comparing with the Hydraulic concrete construction Standard (DL/T5144-2015);
step six: establishing a corresponding relation between an SS concentration index and an aggregate quality index in a configured water sample, and determining stone powder content and fineness modulus index of the aggregate which are mainly influenced by the SS concentration;
step seven: selecting an SS concentration range meeting the aggregate quality requirement, and when the SS concentration in a prepared water sample is controlled within 6000mg/L, the fineness modulus is less than or equal to 2.9, and each detection index in a processed sand sample meets the aggregate quality requirement; when the SS concentration is 2000mg/L, the fineness modulus is less than or equal to 2.8;
thereby determining that the concentration of SS (suspended solid) in water for a hydroelectric engineering sandstone processing system is less than or equal to 6000mg/L to meet the requirement of the water for the sandstone processing system, and taking the concentration of SS (suspended solid) less than or equal to 2000mg/L as a better target of the concentration of SS in water for the sandstone processing system; comprehensively considering, 2000mg/L is selected as the SS treatment target in the production water of the sand processing system in the project;
step eight: collecting the production wastewater of the sandstone aggregate and sandstone processing system in a centralized manner, and feeding the wastewater into a regulating tank;
step nine: precipitating the sewage in the regulating tank for 1h, then feeding the sewage into a precipitation tank, precipitating the wastewater in the precipitation tank by adding PAM with the concentration of 3mg/L and PAC flocculant with the concentration of 300mg/L respectively, wherein the retention time of the wastewater of the sandstone processing production system in the precipitation tank is 2 h;
step ten: when the concentration of SS in the supernatant of the sedimentation tank reaches 2000mg/L, the supernatant enters a clean water tank;
step eleven: the water in the clean water tank is pumped to a sand processing system through a pump station for recycling (as shown in figure 4).
And (4) conclusion: the embodiment reduces the treatment cost of the wastewater produced by the limestone processing system, realizes zero discharge of the wastewater, and achieves the purposes of reaching the standard of wastewater treatment and reducing the sludge production.
Other parts not described belong to the prior art.
Claims (7)
1. A method for reducing wastewater treatment and reuse cost of a hydroelectric engineering sand and stone processing system is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
the method comprises the following steps: optimizing the water SS concentration target for the hydropower station engineering sandstone processing system;
step two: collecting the production wastewater of the sandstone aggregate and sandstone processing system in a centralized manner, and feeding the wastewater into a regulating tank;
step three: pre-precipitating the sewage in the regulating tank for a certain time, then feeding the sewage into a precipitation tank, and adding a flocculating agent into the precipitation tank to carry out precipitation treatment on the wastewater;
step four: when the SS concentration in the supernatant of the sedimentation tank reaches the water target of the sand processing system determined in the step one, the supernatant enters a clean water tank;
step five: and pumping the water in the clean water tank to a sand processing system through a pump station for recycling.
2. The SS index treatment target for the production wastewater of the hydroelectric engineering sand and stone processing system as claimed in claim 1, which is characterized in that: in the first step, a method for selecting the production wastewater meeting the quality of the hydroelectric engineering sandstone aggregate is adopted to select the SS concentration target of the production water of the hydroelectric engineering sandstone processing system;
the method for selecting the production wastewater meeting the quality of the hydroelectric engineering sandstone aggregate specifically comprises the following steps:
s11: taking multiple samples of the production wastewater of the sand and stone processing system of the water and electricity engineering;
s12: respectively measuring the quality of the obtained production wastewater of the sand and stone processing system for multiple times, wherein the detection indexes are as follows: pH, SS, soluble substances, chloride and sulfate, and determining that the main water quality index for restricting the recycling of construction wastewater is SS;
s13: configuring configuration water samples with different SS concentrations between the upper limit and the lower limit of the SS concentration by taking the SS concentration in drinking water as the lower limit and taking the maximum value of the SS concentration in the sand processing system production wastewater detected by multiple samples as the upper limit;
wherein, the SS concentration gradient of the configured water sample is controlled according to the upper limit and the lower limit range:
when the SS concentration range is less than 2000mg/L, preparing a water sample with SS concentration gradient intervals of 100mg/L-500 mg/L;
when the SS concentration range is 2000mg/L-6000mg/L, preparing a water sample with SS concentration gradient intervals of 500mg/L-1000 mg/L;
when the SS concentration range is larger than 6000mg/L, preparing a water sample with SS concentration gradient intervals of 10000mg/L-30000 mg/L;
s14: taking sand samples produced by a sand processing system by using different SS (suspended solid) concentrations to prepare water samples;
s15: carrying out aggregate quality detection on the sand sample obtained in the step S14;
s16: establishing a corresponding relation between an SS concentration index and an aggregate quality index in a configured water sample, and determining stone powder content and fineness modulus index of the aggregate influenced by the SS concentration;
s17: selecting an SS concentration range meeting the aggregate quality requirement, and taking the maximum value of the SS concentration in the range or the SS concentration corresponding to the aggregate quality requirement as the water SS concentration target for the sand processing system.
3. The method of reducing the cost of process water for a hydroelectric engineering sand processing system of claim 1, wherein: in the third step, the flocculating agent is PAM and PAC; the concentrations of PAM and PAC in the sedimentation tank were 3mg/L and 300mg/L, respectively.
4. A method of reducing the cost of process water for a hydroelectric engineering sand processing system according to claim 3, wherein: in the third step, the retention time of the waste water of the sandstone processing production system in the sedimentation tank is 2 hours.
5. The method for selecting the production wastewater meeting the quality of the hydroelectric engineering sandstone aggregates according to claim 2, which is characterized in that: in S15, the aggregate quality detection contents include apparent density, stone powder content, fineness modulus, clod content, organic matter content, sulfide content, and sulfate content.
6. The method for selecting the production wastewater meeting the quality of the hydroelectric engineering sandstone aggregates according to claim 5, which is characterized in that: in S17, when the SS concentration in the prepared water sample is controlled within 6000mg/L, each detection index in the processed sand sample meets the aggregate quality requirement, the stone powder content is 6-18%, and the fineness modulus is less than or equal to 2.9.
7. The method for selecting the production wastewater meeting the quality of the hydroelectric engineering sandstone aggregates according to claim 6, which is characterized in that: in S17, when the SS concentration in the prepared water sample is controlled within 2000mg/L, each detection index in the processed sand sample meets the aggregate quality requirement, the stone powder content is 12% -18%, and the fineness modulus is less than or equal to 2.8.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207031144U (en) * | 2017-07-26 | 2018-02-23 | 洛阳智昊工程科技有限公司 | A kind of sandstone aggregate Waste Water Treatment |
| CN109721191A (en) * | 2019-03-05 | 2019-05-07 | 江苏伊恩赛浦环保科技有限公司 | A kind of sandstone building stones production wastewater treatment system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207031144U (en) * | 2017-07-26 | 2018-02-23 | 洛阳智昊工程科技有限公司 | A kind of sandstone aggregate Waste Water Treatment |
| CN109721191A (en) * | 2019-03-05 | 2019-05-07 | 江苏伊恩赛浦环保科技有限公司 | A kind of sandstone building stones production wastewater treatment system |
Non-Patent Citations (3)
| Title |
|---|
| 巴亚东 等: "《水利水电工程砂石料加工废水处理措施探析》", 《环境科学与技术》 * |
| 陈雯 等: "《构皮滩水电站砂石加工系统废水处理新工艺研究》", 《人民长江》 * |
| 马中: "《中国水价政策研究》", 30 November 2014, 中国环境出版社 * |
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