CN111018312A - Deep dehydration tempering method for municipal domestic sludge - Google Patents
Deep dehydration tempering method for municipal domestic sludge Download PDFInfo
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- CN111018312A CN111018312A CN202010007414.2A CN202010007414A CN111018312A CN 111018312 A CN111018312 A CN 111018312A CN 202010007414 A CN202010007414 A CN 202010007414A CN 111018312 A CN111018312 A CN 111018312A
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- sludge
- coagulant
- hydrogen peroxide
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
Abstract
The invention discloses a deep dehydration tempering method for urban domestic sludge, which comprises the following steps: a. adding a coagulant into the sludge to be dehydrated with the water content of 90-97 percent for reaction for 1min, wherein the adding amount of the coagulant is 5-10 percent of the dry basis of the sludge; the coagulant is prepared by compounding acetic acid, polymeric ferric aluminum silicate and ferrous sulfate heptahydrate, wherein the effective content mass ratio of the acetic acid, the polymeric ferric aluminum silicate and the ferrous sulfate heptahydrate is 1:0.3: 0.8-1: 0.5: 0.8; b. adding an oxidant for reaction for 10min, wherein the oxidant is hydrogen peroxide, and the adding amount of the effective content of the hydrogen peroxide is 20% of the adding amount of the coagulant; c. adjusting the pH value to be neutral, and sending the mixture into a plate-and-frame filter press for dehydration; the method can effectively improve the sludge dewatering performance, does not wear and corrode equipment, has short treatment time, does not increase the sludge amount, does not deteriorate the properties of the dewatered sludge, and can realize resource utilization.
Description
Technical Field
The invention relates to the technical field of sludge dewatering, in particular to a deep dewatering and tempering method for urban domestic sludge.
Background
According to statistics, 4063 seats of a sewage treatment plant are established and operated in an accumulative way in cities and towns of China, and the sewage treatment capacity reaches 1.78 billion cubic meters per day. The annual production of sludge with the water content of 80 percent can reach more than 5000 ten thousand tons, the country pays more attention to the sludge treatment, and the sludge treatment is in need. The sludge treatment is to solve the sludge dewatering problem firstly, while the sludge conditioning is usually used as pretreatment before sludge dewatering, and the sludge conditioning effect directly influences the dewatering speed and the dewatering degree of sludge dewatering equipment, so the conditioning is an important step before sludge dewatering. The sludge conditioning mechanism is to treat sludge by chemical, physical and biological methods and the like, and change the structure of sludge floc so as to achieve the purpose of improving the sludge dewatering performance. The mechanisms of conditioning can be classified into chemical conditioning, physical conditioning and biological conditioning. Among them, chemical conditioning is currently widely used due to the advantages of low investment cost, simple operation, etc.
In the prior art, the sludge conditioning is mainly performed by independently adding an organic flocculant, an inorganic coagulant or an oxidant combined coagulant, wherein the most widely used organic flocculant is polyacrylamide, and the polyacrylamide is added and then is subjected to pressure filtration by a belt filter press, so that the water content of the discharged sludge is about 80 percent generally and does not meet the requirements of related regulations at present. The inorganic coagulant is prepared by adding ferric chloride or polyaluminium chloride and calcium oxide or fly ash, and the prepared sludge is subjected to filter pressing by a plate-and-frame filter press, so that the water content of the discharged sludge can reach below 60 percent. The method of combining the oxidant and the coagulant improves the sludge cracking and coagulation effects, the oxidant and the coagulant are mostly added separately at present, but the reaction time of the oxidant is too long, so that the sludge conditioning process becomes complicated, the time of the whole treatment process is prolonged, the treatment efficiency is low, further the process investment and the operation cost are increased, and the economical efficiency is poor.
Therefore, it is necessary to develop a conditioning method with simple and reasonable process, which can effectively improve the sludge dewatering performance, make the sludge water content meet the relevant regulations, avoid equipment corrosion, shorten the treatment time, avoid sludge increase, avoid deterioration of the properties of the dewatered sludge and realize resource utilization.
Disclosure of Invention
The invention aims to provide a deep dehydration tempering method for urban domestic sludge, which utilizes the synergistic action of a coagulant and an oxidant to temper the urban domestic sludge to achieve sludge modification and deep dehydration, and after the treatment of the method, the minimum energy of the water content of the sludge reaches about 43 percent, the operation is simple and convenient, the reaction time is short, and the method greatly improves the sludge treatment efficiency in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the deep dewatering and tempering method for urban domestic sludge comprises the following steps:
a. adding a coagulant into the sludge to be dehydrated with the water content of 90-97 percent for reaction for 1min, wherein the adding amount of the coagulant is 5-10 percent of the dry basis of the sludge; the coagulant is prepared by compounding acetic acid, polymeric ferric aluminum silicate and ferrous sulfate heptahydrate, wherein the effective content mass ratio of the acetic acid, the polymeric ferric aluminum silicate and the ferrous sulfate heptahydrate is 1:0.3: 0.8-1: 0.5: 0.8;
b. adding an oxidant for reaction for 10min, wherein the oxidant is hydrogen peroxide, and the adding amount of the effective content of the hydrogen peroxide is 20% of the adding amount of the coagulant;
c. adjusting the pH value to be neutral, and sending the mixture into a plate-and-frame filter press for dehydration.
Further, the coagulant and the water are fully stirred and mixed according to the mass ratio of 1:1 for 6 hours before being used.
Further, the hydrogen peroxide is added in two times or continuously within 10 min.
The invention has the beneficial effects that:
the coagulant compounded according to the strict proportion is easy to dissolve and fully reacts with sludge, the coagulation effect of a single coagulant is obviously improved, and a series of dissociation and hydrolysis products have the effects of compressing double electric layers, electrically neutralizing, adsorbing bridging and winding and catching the sludge when the coagulant is mixed with the sludge, so that the effect of improving the sludge dewatering effect is achieved; meanwhile, the coagulant provided by the invention can also remove some heavy metals in the sludge; as the mechanism of the sludge reaction is complex, a coagulant is inevitably remained in the filtrate, and compared with the traditional coagulant, the coagulant remained in the filtrate has the advantages of providing a small amount of carbon source, being capable of serving as a supplementary carbon source to partially reflux, improving the C/N ratio in the sludge by the coagulant adsorbed on the surface of the sludge and being beneficial to the subsequent composting treatment of the sludge; the coagulant provided by the invention can not only enhance coagulation in a sludge conditioning stage, but also reduce odor generated by composting by being adsorbed in sludge in the sludge composting stage.
Secondly, adding an oxidant hydrogen peroxide while using a coagulant, so that the coagulant and the hydrogen peroxide have synergistic effect, and the dehydration performance of the sludge can be obviously enhanced; meanwhile, the invention adopts the hydrogen peroxide which is added for two times within 10min or is continuously added, can fully utilize the fact that a large number of micro bubbles can be generated in the sludge after the hydrogen peroxide is added, prevents unnecessary self consumption of the hydrogen peroxide caused by one-time addition, enhances the contact between the sludge and a coagulant, further improves the coagulation effect and achieves the purpose of improving the sludge dewatering performance.
Thirdly, the coagulant compounded according to the strict proportion can be contacted and reacted with the sludge for 1min, and then hydrogen peroxide can be added, so that the sludge coagulation and oxidation are carried out in a synergistic manner, and the reaction time is greatly shortened; the sludge after the hydrogen peroxide is cracked can be immediately contacted with the coagulant, the dehydration effect is improved, the phenomenon that substances which are beneficial to sludge dehydration are modified to be substances which are not beneficial to sludge dehydration after the sludge is cracked by adding the oxidant for a long time through stirring is avoided, and compared with the traditional process that the oxidant and the coagulant are required to be reacted separately and added, the reaction time is greatly saved, and the treatment efficiency is improved.
The added agents are environment-friendly, no harmful substances are introduced, the adding amount is small, the problems that the adding amount of the agents is large, the reaction time of the agents is long, the dehydration efficiency is low, the equipment is easy to damage and corrode, and the conditioned sludge is not beneficial to subsequent treatment and resource utilization in the prior art are solved, and the conditioning method is low in treatment cost, does not increase solid content and is easy to operate.
Detailed Description
Example one
The invention provides a deep dehydration tempering method for municipal domestic sludge, which comprises the steps of selecting sludge with the water content of 80 percent generated by a domestic sewage plant, preparing 1 ton of sludge with the water content of 92 percent, determining the proportion of 5 percent of the dry basis of the sludge, adding a coagulant, selecting the coagulant with the proportion of 1:0.4:0.8, namely the addition of 4kg, calculating to obtain 1.82kg of acetic acid, 0.73kg of polymeric aluminum ferric silicate, 1.45kg of ferrous sulfate heptahydrate and 0.8kg of hydrogen peroxide; 2.7kg of industrial-grade polymeric ferric aluminum silicate, 1.61kg of ferrous sulfate heptahydrate and about 2.67kg of hydrogen peroxide can be obtained by taking 27% of the effective content of commercial industrial-grade polymeric ferric aluminum silicate, 90% of the content of ferrous sulfate heptahydrate and 30% of the content of hydrogen peroxide; the coagulant and water are proportioned according to a ratio of 1:1, namely 4kg of coagulant is added with 4kg of water to be fully stirred, mixed and placed for 6 hours for use.
And adding 1 ton of sludge with the water content of 92 percent into the prepared coagulant solution, stirring for 1min, adding hydrogen peroxide, reacting for 10min, finely adjusting the pH value to be neutral, finally introducing the tempered sludge mixed solution into a membrane plate-and-frame filter press, pressing for 60min under the pressure of 2MPa, and measuring the water content of the sludge to be 54.19 percent.
Example two
The invention provides a deep dehydration and tempering method for municipal domestic sludge, which comprises the steps of selecting sludge with the water content of 80 percent generated by a domestic sewage plant, preparing 1 ton of sludge with the water content of 92 percent, adding a coagulant according to the proportion of 10 percent of the dry basis of the sludge, selecting a compound coagulant according to the proportion of 1:0.4:0.8, namely the addition of the coagulant is 8kg, calculating to obtain 3.64kg of acetic acid, 1.45kg of polymeric aluminum ferric silicate, 2.9kg of ferrous sulfate heptahydrate and 1.6kg of hydrogen peroxide, wherein the effective content of commercial industrial polymeric aluminum ferric silicate, the content of ferrous sulfate heptahydrate is 27 percent, the content of hydrogen peroxide is 30 percent, and obtaining 5.37kg of the commercial polymeric aluminum ferric silicate, 3.22kg of ferrous sulfate heptahydrate and the amount of hydrogen peroxide is about 5.33 kg. The coagulant and water are proportioned according to a ratio of 1:1, namely 8kg of coagulant is added with 8kg of water to be fully stirred, mixed and placed for 6 hours for use.
And adding 1 ton of sludge with the water content of 92 percent into the prepared coagulant solution, stirring for 1min, adding hydrogen peroxide, reacting for 10min, finely adjusting the pH value to be neutral, finally introducing the tempered sludge mixed solution into a membrane plate-and-frame filter press, pressing for 50min under the pressure of 2MPa, and measuring the water content of the sludge to be 50.64 percent.
EXAMPLE III
Selecting sludge with the water content of 80 percent generated by a domestic sewage plant, preparing 2 tons of sludge with the water content of 97 percent, adding a coagulant according to the proportion of 10 percent of the dry basis of the sludge, selecting the coagulant with the proportion of 1:0.5:0.8, namely the addition of 6kg, and calculating to obtain 2.61kg of acetic acid, 1.3kg of polymeric aluminum ferric silicate, 2.09kg of ferrous sulfate heptahydrate and 1.2kg of hydrogen peroxide, wherein 4.81kg of the industrial polymeric aluminum ferric silicate, 2.32kg of ferrous sulfate heptahydrate and about 4kg of hydrogen peroxide are obtained by taking 27 percent of the effective content of the commercial industrial polymeric aluminum ferric silicate, 90 percent of the ferrous sulfate heptahydrate and 30 percent of the hydrogen peroxide. The coagulant and water are proportioned according to the ratio of 1:1, namely 6kg of coagulant is added with 6kg of water to be fully stirred, mixed and placed for 6 hours for use.
And adding 1 ton of sludge with the water content of 95% into the prepared coagulant solution, stirring for 1min, adding hydrogen peroxide, reacting for 10min, finely adjusting the pH value to be neutral, finally introducing the tempered sludge mixed solution into a membrane plate-and-frame filter press, pressing for 60min under the pressure of 2MPa, and measuring the water content of the sludge to be 45.62%.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.
Claims (3)
1. The deep dehydration tempering method for urban domestic sludge is characterized by comprising the following steps of:
a. adding a coagulant into the sludge to be dehydrated with the water content of 90-97 percent for reaction for 1min, wherein the adding amount of the coagulant is 5-10 percent of the dry basis of the sludge; the coagulant is prepared by compounding acetic acid, polymeric ferric aluminum silicate and ferrous sulfate heptahydrate, wherein the effective content mass ratio of the acetic acid, the polymeric ferric aluminum silicate and the ferrous sulfate heptahydrate is 1:0.3: 0.8-1: 0.5: 0.8;
b. adding an oxidant for reaction for 10min, wherein the oxidant is hydrogen peroxide, and the adding amount of the effective content of the hydrogen peroxide is 20% of the adding amount of the coagulant;
c. adjusting the pH value to be neutral, and sending the mixture into a plate-and-frame filter press for dehydration.
2. The deep dewatering and conditioning method for municipal domestic sludge according to claim 1, wherein step a is performed by first fully stirring and mixing the coagulant and water in a mass ratio of 1:1 for 6 hours before use.
3. The deep dehydration and tempering method for urban domestic sludge according to claim 1 or 2, wherein said hydrogen peroxide is added in two times or continuously within 10 min.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030141255A1 (en) * | 2002-01-29 | 2003-07-31 | Jawed Sarkar | Method of dewatering sludge using enzymes |
| CN104193136A (en) * | 2014-09-22 | 2014-12-10 | 河南工业大学 | Method for improving sludge dewatering performance through organic acid pretreatment |
| CN104891779A (en) * | 2015-06-29 | 2015-09-09 | 北京工业大学 | Combination type efficient sludge dewatering conditioning method |
| CN107686225A (en) * | 2017-09-05 | 2018-02-13 | 神美科技有限公司 | A kind of compound type sludge conditioner for sludge dewatering |
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- 2020-01-04 CN CN202010007414.2A patent/CN111018312B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030141255A1 (en) * | 2002-01-29 | 2003-07-31 | Jawed Sarkar | Method of dewatering sludge using enzymes |
| CN104193136A (en) * | 2014-09-22 | 2014-12-10 | 河南工业大学 | Method for improving sludge dewatering performance through organic acid pretreatment |
| CN104891779A (en) * | 2015-06-29 | 2015-09-09 | 北京工业大学 | Combination type efficient sludge dewatering conditioning method |
| CN107686225A (en) * | 2017-09-05 | 2018-02-13 | 神美科技有限公司 | A kind of compound type sludge conditioner for sludge dewatering |
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