CN115215447A - Method for treating wastewater by biological enhancement process - Google Patents
Method for treating wastewater by biological enhancement process Download PDFInfo
- Publication number
- CN115215447A CN115215447A CN202210948794.9A CN202210948794A CN115215447A CN 115215447 A CN115215447 A CN 115215447A CN 202210948794 A CN202210948794 A CN 202210948794A CN 115215447 A CN115215447 A CN 115215447A
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- China
- Prior art keywords
- wastewater
- treatment
- delivery system
- microorganisms
- selected microorganisms
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- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000002351 wastewater Substances 0.000 title claims abstract description 28
- 244000005700 microbiome Species 0.000 claims abstract description 32
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 16
- 238000005352 clarification Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 239000002699 waste material Substances 0.000 claims abstract 5
- 239000010865 sewage Substances 0.000 claims description 16
- 235000013305 food Nutrition 0.000 claims description 6
- 241000894006 Bacteria Species 0.000 claims description 5
- 239000010815 organic waste Substances 0.000 claims description 4
- 244000052616 bacterial pathogen Species 0.000 claims description 3
- 241001515965 unidentified phage Species 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 239000002910 solid waste Substances 0.000 claims description 2
- 235000015097 nutrients Nutrition 0.000 claims 3
- 239000000356 contaminant Substances 0.000 claims 2
- 241000193388 Bacillus thuringiensis Species 0.000 claims 1
- 241000255925 Diptera Species 0.000 claims 1
- 241000193386 Lysinibacillus sphaericus Species 0.000 claims 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 238000009825 accumulation Methods 0.000 claims 1
- 230000002411 adverse Effects 0.000 claims 1
- 229940097012 bacillus thuringiensis Drugs 0.000 claims 1
- 230000001413 cellular effect Effects 0.000 claims 1
- 210000000805 cytoplasm Anatomy 0.000 claims 1
- 230000006378 damage Effects 0.000 claims 1
- 239000010808 liquid waste Substances 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- 239000011593 sulfur Substances 0.000 claims 1
- 231100000331 toxic Toxicity 0.000 claims 1
- 230000002588 toxic effect Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 239000007787 solid Substances 0.000 abstract description 10
- 229920000642 polymer Polymers 0.000 abstract description 3
- 230000003311 flocculating effect Effects 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 3
- 230000031018 biological processes and functions Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 241000700605 Viruses Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The present invention provides a method for wastewater treatment by a bio-augmentation process that combines several water treatment processes to biologically treat wastewater. The first treatment process is bioaugmentation, which uses a mixture of selected microorganisms grown from waste collected from wastewater treatment plants to treat wastewater flowing through its delivery system. The second process is to use a flow control device that increases the holding capacity of the delivery system to increase the time of biological treatment and allow the contained water to be discharged at a controlled rate of decline and level. The third treatment process is a high speed clarification system, preferably using flocculating polymers to remove fine suspended solids from wastewater.
Description
Technical Field
The present invention relates to a process for treating solid waste from a wastewater treatment plant that receives domestic waste generated by human activity for growth for enhancing operation and biological treatment of the wastewater treatment plant.
Background
The problems associated with wet weather events such as hurricanes are numerous. One major problem is the manner in which the sewage is treated, which may occur in the form of combined sewer overflow, separate sewer overflow and rain water. The treatment of overflow problems and other water pollution associated with wet weather events is primarily a biological process that requires certain conditions to be met in order to perform effectively.
Before the 20 th century, open sewers consisting of gutters and urban riverbeds were common worldwide. In most developed countries, great efforts have been made at the end of the 19 th century and at the beginning of the 20 th century to cover the former open sewers, converting them into closed systems. However, since most cities had no sewage treatment plant at that time, two separate sewer systems were expensive, and thus a separate domestic sewage system was not constructed. Rainwater and domestic sewage are thus combined into one system, called a combined sewer system. The size of the merged sewer system is typically 10 to 100 times the average dry weather sewage flow. As sewage treatment plants are initially built it is not feasible to treat so much water and therefore plants typically only treat the amount of sewage flowing in dry weather. Diverter structures are installed in the collection system to bypass untreated sewage mixed with surface runoff during wet weather events, protecting sewage treatment plants from overflow, but this practice results in untreated sewage being released with rain water during stormwater events.
Such overflow from a merged sewer system, known as a merged sewer overflow, may cause serious water pollution problems when left untreated in wet weather events. These emissions contain human and industrial waste and can result in reduced recreational use and pollution of drinking water sources.
Disclosure of Invention
The invention aims to provide a novel high-efficiency biological wastewater treatment method.
Furthermore, it is an object of the present invention to use bioaugmentation (using microorganisms to assist in the biological treatment of pollution) in wastewater treatment, including bacteria and bacteriophages (viruses).
Furthermore, it is an object of the present invention to bioaugmentation involving a mixture of ideally selected microorganisms to biologically treat wastewater, preferably a set of membrane-forming facultative bacilli.
Furthermore, it is an object of the present invention to use bioaugmentation for treating wastewater in its transport systems, which may include pipes, canals and riverbeds, to provide sufficient residence time for effective biological treatment.
Furthermore, it is an object of the present invention to perform bioaugmentation in a delivery system that is as close as possible to, but preferably at, the source of contamination.
Furthermore, it is an object of the present invention to grow a mixture of selected microorganisms in close proximity to a source of organic material (food as a microorganism) and a source of contamination.
Furthermore, it is an object of the present invention to utilize biosolids produced by a sewage treatment plant to grow selected microorganisms for use within the sewage treatment plant and to deliver the microorganisms to a wastewater delivery system via a conduit contained within the delivery system.
Furthermore, it is an object of the present invention to disinfect biosolids from a sewage treatment plant and convert them into a food source for growing selected beneficial microorganisms for biologically treating wastewater.
Furthermore, it is an object of the present invention to add one or more flow control devices to increase the holding capacity of the wastewater delivery system, which will provide more time for the mixture of selected microorganisms to perform their water treatment function.
In addition, it is an object of the present invention to remove fine suspended solids contained in wastewater using high speed clarification and flocculation polymers, preferably in systems using magnetite as a ballast material in high speed clarification systems, so that the treated wastewater can be discharged directly into the environment.
The importance of flow control in the system stems from the fact that the flow rate during wet weather may be 10 to 100 times the flow rate in the water delivery system during dry weather. Without the use of a variable height weir to delay partial storm flow, the storm flow would be excessive and the microorganisms would have sufficient time to biologically treat the wastewater. Another important function of the flow control device is to level the wastewater over a period of time in order to clarify and disinfect the wastewater at a slower rate over a longer period of time. It is also within the scope of the invention to extend the wastewater transport system (e.g., canal) along the edge of the riverbed in order to increase the residence time of the biological process and save space. In some cases the wastewater delivery system may actually be placed in the riverbed.
A third aspect of the treatment according to the invention is efficient clarification, followed by disinfection if necessary. In order to reach the total suspended solids limit, clarification must be performed because the limit level affects the basic oxygen demand, which is an indicator of the organic content and bacterial level, and therefore the fine suspended solids must be removed. The most effective method of removing fine particles is high speed clarification using flocculating polymers. Due to the high flow rates during heavy rains, only high flow clarification is applicable, mainly due to space and cost limitations. The present invention contemplates high speed clarification methods using clarifiers with surface overflow rates greater than 10 gallons per minute.
High speed clarification produces a concentrated slurry of suspended solids, about 1-5% by weight. This slurry can be mechanically dewatered to produce a dry filter cake, either for land-fill or land-based use. Another economical solution is to flow the concentrated slurry into a dewatering vessel that will allow sufficient time for the solids to settle and then be periodically purged as more concentrated wet solids. Such wet solids can be used on land, but cannot be landfilled unless tested by paint filter dripping. Assuming that the total suspended solids content is low enough to meet regulatory constraints, the supernatant of the dehydration containment vessel may be discharged directly. The best solution, however, is to apply the concentrated sludge from the high speed clarification system or dewatering vessel directly to the ground to improve soil conditions or to a sewage treatment plant to increase biological treatment capacity.
The effectiveness of a biological treatment system depends on the type of microorganism and the conditions that promote the growth of a healthy population of microorganisms. Two basic types of microorganisms are mobile organisms, which are free-floating and immobilized microorganisms that attach to certain solid surfaces. The effectiveness of the biological treatment system is improved when both mobile and stationary microorganisms are present. Increasing the surface area to which the immobilized microorganisms are attached can increase the concentration of the microorganisms, thereby increasing the effectiveness of the biological treatment process.
Drawings
Figure 1 shows an overview of the treatment technology employed according to the present invention and how it can be integrated to produce the desired result of economically treating wastewater.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, wastewater (1) flowing through a water delivery system (2), such as a lake, river, water storage structure, etc., is fed with a mixture of selected microorganisms (37) that treat the wastewater within the water delivery system (2) to consume unwanted organic matter. Organisms may include facultative bacilli and bacteriophages. A water delivery system (2) comprising a flowing stream of wastewater (1) comprises a plurality of biological carriers (14) attached to an inner surface of the water delivery system (2) to increase the surface area for biofilm growth. At or near the beginning of the transport system (2) is also injected a mixture of selected microorganisms (37) growing in a growth system (38) using organic waste (30) from a sewage treatment plant (36) and other organic waste (31) as shown in fig. 1.
Claims (9)
1. A method of wastewater treatment by a bioaugmentation process, characterized by: growing selected microorganisms at a wastewater treatment plant using appropriately treated solid and liquid waste and other waste produced or received; introducing a mixture of selected microorganisms into an inlet end of a wastewater delivery system to convert the delivery system into a treatment system capable of on-line destruction of harmful microorganisms, treatment of toxic organics, BOD reduction and nutrient removal from a wastewater stream; adjustable flow control devices are provided in the wastewater delivery system to allow control of wastewater accumulation within the delivery system, thereby controlling the residence time of wastewater streams in the delivery system and providing high speed clarification treatment to treat wastewater biologically treated in the delivery system to meet discharge limits and end use requirements.
2. A method of wastewater treatment by a bioaugmentation process as claimed in claim 1, wherein the mixture of selected microorganisms contains free-floating and film-forming bacteria and bacteriophages that have adverse effects on harmful bacteria (such as SBR bacteria and other microorganisms).
3. A method of wastewater treatment by a bioaugmentation process as in claim 1, wherein the mixture of selected microorganisms comprises bacillus thuringiensis and bacillus sphaericus for mosquito killing.
4. A method of wastewater treatment by a bioaugmentation process as in claim 1, wherein the mixture of selected microorganisms is grown at or near the site where the nutrients found in the contaminants or other organic waste enter the delivery system as a food source.
5. A method of wastewater treatment by a bioaugmentation process as in claim 1, wherein the mixture of selected microorganisms is grown at or near the site where the nutrients found in the contaminants or other organic waste enter the delivery system as a food source.
6. A method of wastewater treatment by a bioaugmentation process as in claim 1, wherein attached bio-carrier surfaces are added to a transport system comprising pipes, canals, rivers and riverbeds to promote the growth of selected microorganisms as biofilms.
7. A method of wastewater treatment by a bioaugmentation process as in claim 6, wherein the transport system may be a pipe, canal or natural waterway, extended by an artificial canal or other transport system added alongside or within a river or stream to increase residence time so that biological treatment may continue to treat the wastewater prior to entering the river or stream.
8. A method of wastewater treatment by a bio-augmentation process as claimed in claim 1, wherein biosolids or other waste received from sewage treatment plants are disinfected and lysed to produce suitable food products to grow the selected microorganisms.
9. A method of wastewater treatment by a bioaugmentation process as in claim 1, wherein the waste used to culture the selected microorganisms is disinfected and lysed by methods including but not limited to mechanical, thermal, electrical, sonic methods, but preferably hydrodynamic cavitation to kill unwanted competing microorganisms, including pathogenic bacteria and Sulfur Reducing Bacteria (SRB), and to increase the food value of the waste by releasing a cellular protoplasm content that favors the culture of the selected microorganisms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210948794.9A CN115215447A (en) | 2022-08-09 | 2022-08-09 | Method for treating wastewater by biological enhancement process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210948794.9A CN115215447A (en) | 2022-08-09 | 2022-08-09 | Method for treating wastewater by biological enhancement process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115215447A true CN115215447A (en) | 2022-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210948794.9A Pending CN115215447A (en) | 2022-08-09 | 2022-08-09 | Method for treating wastewater by biological enhancement process |
Country Status (1)
| Country | Link |
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| CN (1) | CN115215447A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060109635A (en) * | 2005-04-18 | 2006-10-23 | (주)범한엔지니어링 종합건축사 사무소 | Advanced swage and waste water treatment method and apparaters use of selected and cultured bacillus species bacteria |
| CN101977854A (en) * | 2008-03-18 | 2011-02-16 | 通用电气公司 | Wang sijing [cn] |
-
2022
- 2022-08-09 CN CN202210948794.9A patent/CN115215447A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060109635A (en) * | 2005-04-18 | 2006-10-23 | (주)범한엔지니어링 종합건축사 사무소 | Advanced swage and waste water treatment method and apparaters use of selected and cultured bacillus species bacteria |
| CN101977854A (en) * | 2008-03-18 | 2011-02-16 | 通用电气公司 | Wang sijing [cn] |
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