CN113233636A - Treatment process of low-temperature low-turbidity water with excessive iron and manganese - Google Patents

Treatment process of low-temperature low-turbidity water with excessive iron and manganese Download PDF

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CN113233636A
CN113233636A CN202110415976.5A CN202110415976A CN113233636A CN 113233636 A CN113233636 A CN 113233636A CN 202110415976 A CN202110415976 A CN 202110415976A CN 113233636 A CN113233636 A CN 113233636A
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water
low
source
turbidity
manganese
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任良
张新宇
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Shenzhen Sinolegend Environmental Protection Science & Technology Co ltd
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Shenzhen Sinolegend Environmental Protection Science & Technology Co ltd
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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
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • 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
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • 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
    • 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
    • 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
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/203—Iron or iron compound
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/206—Manganese or manganese compounds
    • 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
    • C02F2209/001—Upstream control, i.e. monitoring for predictive control

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  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

The invention discloses a treatment process of low-temperature low-turbidity water with excessive ferro-manganese content, which comprises the steps of water source water air floatation treatment, water source water reaction nucleus addition, quicklime powder adding at a water source water inlet, oxidant adding in a water source water inlet pipeline and water source water automatic control system addition. The invention can: 1. effectively removing suspended matters (SS); 2. the total phosphorus is effectively removed; 3. effectively increasing the oxygen ions of water source water and reducing CO 2; 4. under the action of increasing oxygen and an oxidant, total nitrogen is effectively removed; 5. under the oxidation action, iron and manganese are effectively removed; 6. effectively reducing turbidity value, and controlling turbidity value to be about 1 NTU; 7. the filtering efficiency of the filter is improved and the yield is improved; 8. the labor intensity of workers is reduced; 9. the quality of the factory water can be effectively improved; 10. water resources can be effectively saved; 11. the improvement of the system makes up for the short production plates of the existing running water works; 12. the investment is saved, the effect is fast, and the energy consumption is basically not consumed by combining the prior water treatment process.

Description

Treatment process of low-temperature low-turbidity water with excessive iron and manganese
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a treatment process of low-temperature low-turbidity water with excessive ferro-manganese content.
Background
In the vast regions of China, the source water of local water plants is mostly surface water such as reservoir water, river water, lake water and the like. In the case of long-term sediment accumulation, the surface water is in a low turbidity state before being treated by a water plant, the plum rain season is generally below 30NTU, and the dry season is mostly below 10 NTU. And in the natural condition of surface water, iron and manganese basically sink and collect in the lower layer stage of the water layer in the second-order state, and the iron and manganese just above the water intake level of a water plant.
At present, the current situation of pretreatment and precipitation processes of water source water of water works in China basically refers to the international common water treatment process: grid flocculation + inclined tube sedimentation or grid flocculation + advection sedimentation. The actual conditions of low temperature, low turbidity and excessive ferro-manganese combined with water resources of local regions are not considered, so that the cost of human resources, the cost of adding chlorine and chemicals, the cost of electric energy consumption, the cost of water resource waste and the like are increased in the actual production process, and the actual quality of the factory water is difficult to control to reach the standard. Meanwhile, the water treatment technology of workers is lacked, the water treatment technology of most workers is lacked, the processes of adding chlorine and adding medicine are understood one by one, the flocculation and disinfection processes are not understood in place, the filtration process and the backwashing process are not understood in place, and the like.
The prior treatment process of low-temperature low-turbidity water with excessive ferro-manganese has the following difficulties: 1. in the state of 0 to 100 ℃ of low temperature, the lower the temperature, the higher the viscosity, resulting in difficulty in polymerization, precipitation, etc. of the reaction nuclei in water. 2. The lower the temperature, the greater the degree of adhesion damping between the flocculant and the reaction nuclei. 3. The reaction nuclei in the low-turbidity water are few, the mutual collision is reduced, and the flocculation effect is poor. 4. The reaction nucleus in the low-turbidity water is less, and the net catching capability is poor, so that the trivalent iron and manganese are difficult to adsorb and precipitate. 5. In a divalent state, ferro-manganese exists in water in a solid state, and cannot be filtered out by a sand filter in a 100 percent mode because particle molecules are tiny and difficult to precipitate in a short time. The oxidized ferro-manganese is easy to dissolve in water in a trivalent state, has specific gravity larger than that of water, and has strong adsorbability in the trivalent state. 6. The second-order ferro-manganese in water can not be filtered out by 100 percent in the manganese sand filter tank process at present. 7. The iron and manganese exceed the standard, and after the disinfectant is put into the home, the iron and manganese are converted into a trivalent state through oxidation under a divalent state, so that the chromaticity of the factory water exceeds the standard.
In view of this, it is necessary to provide an efficient, energy-saving and environment-friendly treatment method for low-temperature and low-turbidity water with excessive iron and manganese content.
Disclosure of Invention
The invention aims to make up for the defects of the prior art and provides a treatment process of low-temperature low-turbidity water with excessive iron and manganese.
In order to achieve the above object, the present invention provides the following technical solutions:
a process for treating the water with low temp, turbidity and excessive Fe and Mn contents includes air floating treatment of water source, adding the reaction core of water source, adding calcium lime powder to the water inlet of water source, adding oxidant to the water inlet of water source, and adding automatic control system of water source.
Further, the water source water air floatation treatment specifically comprises the following steps: under the condition that the source water has the pressure of more than 2.5Mpa, the source water is subjected to full air floatation or bypass valve control according to the flow rate of not less than 30 percent and partial air floatation process treatment by utilizing the pressure difference induced by the source water.
Further, the source water reaction core is selected from any one or more of yellow clay slurry, pe particles, activated carbon and lime particles.
Furthermore, when a source water reaction nucleus is added, filter backwashing water is adopted for backflow or sedimentation alum floc backflow in a sedimentation tank buffer section, and the backflow flow is controlled within 10% of the source water flow.
Further, the concrete operation of adding quicklime powder at the water inlet of the water source is as follows: adding a powder adding system at the water inlet of the water source, and adding quicklime powder when the iron and manganese in the water source exceed the standard and the pH value of the water body is 6.5-7.3 until the pH value of the water body reaches 7.8-8.5.
Furthermore, the automatic source water control system can automatically control the low-temperature low-turbidity treatment system, the ferro-manganese standard-exceeding removal system and the dry powder adding system to perform disinfection and dosing according to source water pressure, flow, turbidity, pH value and ORP data, adjust the negative pressure of the negative pressure mixing device, automatically control the water level of a clean water tank of a water plant, and automatically control the opening of a sludge discharge valve.
Further, the control process of the automatic control system is as follows:
(1) when the head pressure of the source water is not less than 2.3Mp, the turbidity is lower than 30NTU, the ferro-manganese detection exceeds the standard, and the temperature follows the natural conditions, namely a low-temperature low-turbidity treatment system and a ferro-manganese exceeding removal system are started;
(2) when the device is started, the bypass valve is opened, the water inlet valve is adjusted, the flocculating agent and the oxidizing agent are added when the negative pressure of the negative pressure mixing device is between 500 and 2000Bar, and the valve of the sludge return pipe is opened at the same time;
(3) when the water source water particles are insufficient in the early stage, starting a dry powder adding system, adjusting the dosage according to the number of reaction nuclei in a variable frequency manner, and stopping when the saturation of the reaction nuclei particles reaches the limit;
(4) when the iron and manganese of the source water exceed the standard, starting a dry powder adding system, adjusting the pH value of the source water to be 8.0 and 5% of deviation, and performing variable frequency adjustment according to the pH value;
(5) when the temperature is low, the air floatation valve is opened, the air floatation strength is adjusted, oxygen ions are increased, and CO is reduced2And the flocculation effect is enhanced.
Further, the flocculant is prepared from the following raw materials in parts by weight: 14-20 parts of polyaluminum chloride, 1-1.5 parts of beta-cyclodextrin, 5-7 parts of dimethyl diallyl ammonium chloride, 0.1-0.3 part of ammonium persulfate and 0.02-0.06 part of tetrasodium ethylene diamine tetraacetate.
Further, the preparation method of the flocculant comprises the following steps: mixing polyaluminum chloride and dimethyl diallyl ammonium chloride, dissolving in water of 5-10 times of the mass of the polyaluminum chloride, adding beta-cyclodextrin, ammonium persulfate and tetrasodium ethylene diamine tetraacetate, reacting at 55-65 ℃ for 4-6 hours, and drying to constant weight to obtain the final product.
The invention has the advantages that:
the invention can remove Suspended Substances (SS) and reduce CO by air floatation treatment of the source water2The dissolved oxygen of the water source water is increased, the condensation effect of the reaction nuclei in the water source water is increased, the buoyancy of the reaction nuclei is increased when the oxygen ions are released from the air-floated water, the reaction nuclei and the water in the water source water are quickly separated to the surface of a water layer, and after the reaction nuclei condense to a certain weight, the reaction nuclei can naturally precipitate to the bottom of the reaction tank and are discharged from a mud valve.
The addition of the reaction nuclei of the source water, the reflux mode, the dosing cost of the reaction nuclei, the combination of the air flotation process, the effective increase of the net catching capacity of the reaction nuclei in the source water and the further enhancement of the flocculation and coagulation capacity can be greatly reduced.
In the dry season, the ferro-manganese of the source water generally exceeds the standard, the pH value of the source water is generally 6.5 to 8.0, when the pH is below 7.3, the dosing flocculation effect is poor, the ferro-manganese removal effect is not ideal, quicklime powder is added at the water inlet of the source water, the quicklime powder is used as a coagulant aid, the number of reaction nuclei in the source water is increased, the pH value of the water is adjusted to be a proper oxidation environment of the ferro-manganese, and the ferro-manganese is removed efficiently.
The oxidant is added into the water inlet pipeline of the water source water, so that on one hand, the generation of microorganisms such as algae and the like in the precipitation reaction tank can be reduced, the labor intensity of manual hygiene is reduced, on the other hand, the oxidant is oxidized with the ferro-manganese substances in the water source water, the form of the bivalent ferro-manganese substances in the water is oxidized into the form of the trivalent ferro-manganese substances, and the adsorption precipitation removal is carried out in the process of combining air floatation and flocculation.
According to the invention, the composite flocculant is formed by adopting inorganic material polyaluminium chloride, organic materials beta-cyclodextrin and dimethyl diallyl ammonium chloride, so that a large amount of sludge and corrosivity caused by a single inorganic flocculant and a narrow application range of the organic flocculant are avoided, the inorganic flocculant and the organic flocculant are bonded through ionic bonds, the molecular chain size is increased through the bonding effect in water, the composite flocculant has stronger adsorption capacity and more excellent bridging capacity, and meanwhile, added cyclodextrin molecules can be bridged through the hydrogen bonding effect to generate a synergistic flocculation effect, so that the flocculant can form enough floc sedimentation, and the flocculation efficiency is accelerated.
The invention also has the following advantages: 1. effectively removing suspended matters (SS); 2. the total phosphorus is effectively removed; 3. effectively increase oxygen ions in water source and reduce CO2(ii) a 4. Under the action of increasing oxygen and an oxidant, total nitrogen is effectively removed; 5. under the oxidation action, iron and manganese are effectively removed; 6. effectively reducing turbidity value, and controlling turbidity value to be about 1 NTU; 7. the filtering efficiency of the filter is improved and the yield is improved; 8. the labor intensity of workers is reduced; 9. the quality of the factory water can be effectively improved; 10. water resources can be effectively saved; 11. the improvement of the system makes up for the existing operationThe production short plate of the tap water plant; 12. the investment is saved, the effect is fast, and the energy consumption is basically not consumed by combining the prior water treatment process.
Drawings
FIG. 1 shows a process flow diagram of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the specific examples as follows:
example 1
A process for treating the water with low temp, turbidity and excessive Fe and Mn contents includes air floating treatment of water source, adding the reaction core of water source, adding calcium lime powder to the water inlet of water source, adding oxidant to the water inlet of water source, and adding automatic control system of water source.
The water source water air floatation treatment is as follows: under the condition that the source water has the pressure of more than 2.5Mpa, the source water is subjected to full air floatation or bypass valve control according to the flow rate of not less than 30 percent and partial air floatation process treatment by utilizing the pressure difference induced by the source water.
The source water reaction core is selected from one or more of yellow clay slurry, pe particles, activated carbon and lime particles.
When the reaction nucleus of the source water is increased, the backwashing water of the filter tank is adopted for backflow or the precipitated alum floc backflow in the buffer section of the sedimentation tank is adopted, and the backflow flow is controlled within 10 percent of the flow of the source water.
The concrete operation of adding quicklime powder at the water inlet of the water source is as follows: adding a powder adding system at the water inlet of the water source, and adding quicklime powder when the iron and manganese in the water source exceed the standard and the pH value of the water body is 6.5-7.3 until the pH value of the water body reaches 7.8-8.5.
The automatic source water control system can automatically control the low-temperature low-turbidity treatment system, the ferro-manganese standard exceeding removal system and the dry powder adding system to perform disinfection and dosing according to source water pressure, flow, turbidity, pH value and ORP data, adjust the negative pressure of the negative pressure mixing device, automatically control the water level of a clean water tank of a water plant, and automatically control the opening of a sludge discharge valve.
As shown in fig. 1, the control process of the automatic control system is as follows:
(1) when the head pressure of the source water is not less than 2.3Mp, the turbidity is lower than 30NTU, the ferro-manganese detection exceeds the standard, and the temperature follows the natural conditions, namely a low-temperature low-turbidity treatment system and a ferro-manganese exceeding removal system are started;
(2) when the device is started, the bypass valve is opened, the water inlet valve is adjusted, the flocculating agent and the oxidizing agent are added when the negative pressure of the negative pressure mixing device is between 500 and 2000Bar, and the valve of the sludge return pipe is opened at the same time;
(3) when the water source water particles are insufficient in the early stage, starting a dry powder adding system, adjusting the dosage according to the number of reaction nuclei in a variable frequency manner, and stopping when the saturation of the reaction nuclei particles reaches the limit;
(4) when the iron and manganese of the source water exceed the standard, starting a dry powder adding system, adjusting the pH value of the source water to be 8.0 and 5% of deviation, and performing variable frequency adjustment according to the pH value;
(5) when the temperature is low, the air floatation valve is opened, the air floatation strength is adjusted, oxygen ions are increased, and CO is reduced2And the flocculation effect is enhanced.
The flocculant is prepared from the following raw materials in parts by weight: 17 parts of polyaluminum chloride, 1.2 parts of beta-cyclodextrin, 6 parts of dimethyl diallyl ammonium chloride, 0.2 part of ammonium persulfate and 0.04 part of tetrasodium ethylene diamine tetraacetate. The preparation method comprises the following steps: mixing polyaluminum chloride and dimethyl diallyl ammonium chloride, dissolving in water with the mass of 8 times, adding beta-cyclodextrin, ammonium persulfate and tetrasodium ethylene diamine tetraacetate, reacting at 60 ℃ for 5 hours, and drying to constant weight to obtain the final product.
Example 2
A process for treating the water with low temp, turbidity and excessive Fe and Mn contents includes air floating treatment of water source, adding the reaction core of water source, adding calcium lime powder to the water inlet of water source, adding oxidant to the water inlet of water source, and adding automatic control system of water source.
The water source water air floatation treatment is as follows: under the condition that the source water has the pressure of more than 2.5Mpa, the source water is subjected to full air floatation or bypass valve control according to the flow rate of not less than 30 percent and partial air floatation process treatment by utilizing the pressure difference induced by the source water.
The source water reaction core is selected from one or more of yellow clay slurry, pe particles, activated carbon and lime particles.
When the reaction nucleus of the source water is increased, the backwashing water of the filter tank is adopted for backflow or the precipitated alum floc backflow in the buffer section of the sedimentation tank is adopted, and the backflow flow is controlled within 10 percent of the flow of the source water.
The concrete operation of adding quicklime powder at the water inlet of the water source is as follows: adding a powder adding system at the water inlet of the water source, and adding quicklime powder when the iron and manganese in the water source exceed the standard and the pH value of the water body is 6.5-7.3 until the pH value of the water body reaches 7.8-8.5.
The automatic source water control system can automatically control the low-temperature low-turbidity treatment system, the ferro-manganese standard exceeding removal system and the dry powder adding system to perform disinfection and dosing according to source water pressure, flow, turbidity, pH value and ORP data, adjust the negative pressure of the negative pressure mixing device, automatically control the water level of a clean water tank of a water plant, and automatically control the opening of a sludge discharge valve.
As shown in fig. 1, the control process of the automatic control system is as follows:
(1) when the head pressure of the source water is not less than 2.3Mp, the turbidity is lower than 30NTU, the ferro-manganese detection exceeds the standard, and the temperature follows the natural conditions, namely a low-temperature low-turbidity treatment system and a ferro-manganese exceeding removal system are started;
(2) when the device is started, the bypass valve is opened, the water inlet valve is adjusted, the flocculating agent and the oxidizing agent are added when the negative pressure of the negative pressure mixing device is between 500 and 2000Bar, and the valve of the sludge return pipe is opened at the same time;
(3) when the water source water particles are insufficient in the early stage, starting a dry powder adding system, adjusting the dosage according to the number of reaction nuclei in a variable frequency manner, and stopping when the saturation of the reaction nuclei particles reaches the limit;
(4) when the iron and manganese of the source water exceed the standard, starting a dry powder adding system, adjusting the pH value of the source water to be 8.0 and 5% of deviation, and performing variable frequency adjustment according to the pH value;
(5) when the temperature is low, the air floatation valve is opened, the air floatation strength is adjusted, oxygen ions are increased, and CO is reduced2And the flocculation effect is enhanced.
The flocculant is prepared from the following raw materials in parts by weight: 14 parts of polyaluminum chloride, 1 part of beta-cyclodextrin, 5 parts of dimethyldiallylammonium chloride, 0.1 part of ammonium persulfate and 0.02 part of tetrasodium ethylene diamine tetraacetate. The preparation method comprises the following steps: mixing polyaluminum chloride and dimethyl diallyl ammonium chloride, dissolving in 5 times of water, adding beta-cyclodextrin, ammonium persulfate and tetrasodium ethylene diamine tetraacetate, reacting at 55 deg.C for 6 hr, and oven drying to constant weight.
Example 3
A process for treating the water with low temp, turbidity and excessive Fe and Mn contents includes air floating treatment of water source, adding the reaction core of water source, adding calcium lime powder to the water inlet of water source, adding oxidant to the water inlet of water source, and adding automatic control system of water source.
The water source water air floatation treatment is as follows: under the condition that the source water has the pressure of more than 2.5Mpa, the source water is subjected to full air floatation or bypass valve control according to the flow rate of not less than 30 percent and partial air floatation process treatment by utilizing the pressure difference induced by the source water.
The source water reaction core is selected from one or more of yellow clay slurry, pe particles, activated carbon and lime particles.
When the reaction nucleus of the source water is increased, the backwashing water of the filter tank is adopted for backflow or the precipitated alum floc backflow in the buffer section of the sedimentation tank is adopted, and the backflow flow is controlled within 10 percent of the flow of the source water.
The concrete operation of adding quicklime powder at the water inlet of the water source is as follows: adding a powder adding system at the water inlet of the water source, and adding quicklime powder when the iron and manganese in the water source exceed the standard and the pH value of the water body is 6.5-7.3 until the pH value of the water body reaches 7.8-8.5.
The automatic source water control system can automatically control the low-temperature low-turbidity treatment system, the ferro-manganese standard exceeding removal system and the dry powder adding system to perform disinfection and dosing according to source water pressure, flow, turbidity, pH value and ORP data, adjust the negative pressure of the negative pressure mixing device, automatically control the water level of a clean water tank of a water plant, and automatically control the opening of a sludge discharge valve.
As shown in fig. 1, the control process of the automatic control system is as follows:
(1) when the head pressure of the source water is not less than 2.3Mp, the turbidity is lower than 30NTU, the ferro-manganese detection exceeds the standard, and the temperature follows the natural conditions, namely a low-temperature low-turbidity treatment system and a ferro-manganese exceeding removal system are started;
(2) when the device is started, the bypass valve is opened, the water inlet valve is adjusted, the flocculating agent and the oxidizing agent are added when the negative pressure of the negative pressure mixing device is between 500 and 2000Bar, and the valve of the sludge return pipe is opened at the same time;
(3) when the water source water particles are insufficient in the early stage, starting a dry powder adding system, adjusting the dosage according to the number of reaction nuclei in a variable frequency manner, and stopping when the saturation of the reaction nuclei particles reaches the limit;
(4) when the iron and manganese of the source water exceed the standard, starting a dry powder adding system, adjusting the pH value of the source water to be 8.0 and 5% of deviation, and performing variable frequency adjustment according to the pH value;
(5) when the temperature is low, the air floatation valve is opened, the air floatation strength is adjusted, oxygen ions are increased, and CO is reduced2And the flocculation effect is enhanced.
The flocculant is prepared from the following raw materials in parts by weight: 20 parts of polyaluminum chloride, 1.5 parts of beta-cyclodextrin, 7 parts of dimethyl diallyl ammonium chloride, 0.3 part of ammonium persulfate and 0.06 part of tetrasodium ethylene diamine tetraacetate. The preparation method comprises the following steps: mixing polyaluminum chloride and dimethyl diallyl ammonium chloride, dissolving in 10 times of water, adding beta-cyclodextrin, ammonium persulfate and tetrasodium ethylene diamine tetraacetate, reacting at 65 deg.C for 4 hr, and oven drying to constant weight.
Comparative example 1
The traditional grid flocculation and inclined tube sedimentation treatment mode is adopted for the source water with low temperature, low turbidity and excessive ferro-manganese.
Comparative example 2
The traditional grid flocculation and advection sedimentation treatment mode is adopted for the source water with low temperature, low turbidity and excessive ferro-manganese.
The water treatment effects of examples 1, 2, 3 and comparative examples 1, 2 were examined by water intake:
water quality of inlet water: pH 6.8, NTU (turbidity) 26, Fe2+20.3mg/L，Mn2+3.1mg/L。
The effluent quality is shown in table 1:
TABLE 1
pH NTU Fe2+(mg/L) Mn2+(mg/L)
Example 1 7.1 0.6 0.03 0.02
Example 2 7.2 0.7 0.04 0.02
Example 3 7.1 0.6 0.03 0.02
Comparative example 1 6.8 1.2 0.26 0.08
Comparative example 2 6.9 1.5 0.21 0.07
As can be seen from the table above, the water treated in the examples 1-3 and the comparative examples 1 and 2 meets the existing sanitary standard for domestic drinking water (GB5749-2006)) in terms of iron and manganese indexes, and meanwhile, the water quality index treated in the examples is far superior to the national standard, and the removal efficiency of iron and manganese ions is higher than that of the comparative examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A process for treating the low-temp, low-turbidity and over-standard Fe-Mn water includes air floating treatment of water source, adding reaction core, adding calcium lime powder, adding oxidant, and automatic control system.
2. The process for treating low-temperature low-turbidity water with excessive ferro-manganese content according to claim 1, wherein the water source water air floatation treatment is as follows: under the condition that the source water has the pressure of more than 2.5Mpa, the source water is subjected to full air floatation or bypass valve control according to the flow rate of not less than 30 percent and partial air floatation process treatment by utilizing the pressure difference induced by the source water.
3. The process for treating low-temperature low-turbidity water with excessive ferro-manganese content as claimed in claim 1, wherein the reaction core of the source water is selected from one or more of yellow clay slurry, pe particles, activated carbon and lime particles.
4. The process for treating low-temperature low-turbidity water with excessive ferro-manganese content according to claim 1, wherein when a source water reaction nucleus is added, a filter back washing water is adopted for backflow or precipitation alum floc backflow in a sedimentation tank buffer section is adopted, and the backflow flow is controlled within 10% of the source water flow.
5. The process for treating low-temperature low-turbidity water with excessive ferro-manganese content according to claim 1, wherein the concrete operations of adding quicklime powder at the water inlet of the water source are as follows: adding a powder adding system at the water inlet of the water source, and adding quicklime powder when the iron and manganese in the water source exceed the standard and the pH value of the water body is 6.5-7.3 until the pH value of the water body reaches 7.8-8.5.
6. The process for treating low-temperature low-turbidity water with excessive ferro-manganese content as claimed in claim 1, wherein the automatic source water control system can automatically control the low-temperature low-turbidity treatment system, the ferro-manganese removal system and the dry powder adding system according to the source water pressure, flow, turbidity, pH value and ORP data to perform disinfection and chemical addition, adjust the negative pressure of the negative pressure mixing device, automatically control the water level of the clean water tank of the water plant, and automatically control the opening of the sludge discharge valve.
7. The process for treating low-temperature low-turbidity water with excessive ferro-manganese content as claimed in claim 6, wherein the control process of the automatic control system is as follows:
(1) when the head pressure of the source water is not less than 2.3Mp, the turbidity is lower than 30NTU, the ferro-manganese detection exceeds the standard, and the temperature follows the natural conditions, namely a low-temperature low-turbidity treatment system and a ferro-manganese exceeding removal system are started;
(2) when the device is started, the bypass valve is opened, the water inlet valve is adjusted, the flocculating agent and the oxidizing agent are added when the negative pressure of the negative pressure mixing device is between 500 and 2000Bar, and the valve of the sludge return pipe is opened at the same time;
(3) when the water source water particles are insufficient in the early stage, starting a dry powder adding system, adjusting the dosage according to the number of reaction nuclei in a variable frequency manner, and stopping when the saturation of the reaction nuclei particles reaches the limit;
(4) when the iron and manganese of the source water exceed the standard, starting a dry powder adding system, adjusting the pH value of the source water to be 8.0 and 5% of deviation, and performing variable frequency adjustment according to the pH value;
(5) when the temperature is low, the air floatation valve is opened, the air floatation strength is adjusted, oxygen ions are increased, and CO is reduced2And the flocculation effect is enhanced.
8. The process for treating low-temperature low-turbidity water with excessive ferrum and manganese contents according to claim 7, wherein the flocculating agent is prepared from the following raw materials in parts by weight: 14-20 parts of polyaluminum chloride, 1-1.5 parts of beta-cyclodextrin, 5-7 parts of dimethyl diallyl ammonium chloride, 0.1-0.3 part of ammonium persulfate and 0.02-0.06 part of tetrasodium ethylene diamine tetraacetate.
9. The process for treating low-temperature low-turbidity water with excessive ferro-manganese content according to claim 8, wherein the preparation method of the flocculant comprises the following steps: mixing polyaluminum chloride and dimethyl diallyl ammonium chloride, dissolving in water of 5-10 times of the mass of the polyaluminum chloride, adding beta-cyclodextrin, ammonium persulfate and tetrasodium ethylene diamine tetraacetate, reacting at 55-65 ℃ for 4-6 hours, and drying to constant weight to obtain the final product.
CN202110415976.5A 2021-04-19 2021-04-19 Treatment process of low-temperature low-turbidity water with excessive iron and manganese Pending CN113233636A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189381A (en) * 1978-09-07 1980-02-19 Amax Inc. Waste water treatment
CN102976526A (en) * 2012-12-11 2013-03-20 北京翰祺环境技术有限公司 Forced external circulating type efficient precipitation method and equipment based on addition of lime
CN103253787A (en) * 2012-02-17 2013-08-21 上海市政工程设计研究总院（集团）有限公司 Season metal polluted low-turbidity high-alga raw water strengthening treatment apparatus and technology thereof
CN111646597A (en) * 2020-06-15 2020-09-11 山东滨州智源生物科技有限公司 Application of beta-cyclodextrin derivative as coagulant aid in treatment of drinking water

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189381A (en) * 1978-09-07 1980-02-19 Amax Inc. Waste water treatment
CN103253787A (en) * 2012-02-17 2013-08-21 上海市政工程设计研究总院（集团）有限公司 Season metal polluted low-turbidity high-alga raw water strengthening treatment apparatus and technology thereof
CN102976526A (en) * 2012-12-11 2013-03-20 北京翰祺环境技术有限公司 Forced external circulating type efficient precipitation method and equipment based on addition of lime
CN111646597A (en) * 2020-06-15 2020-09-11 山东滨州智源生物科技有限公司 Application of beta-cyclodextrin derivative as coagulant aid in treatment of drinking water

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