CN103204613B - Method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge - Google Patents
Method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge Download PDFInfo
- Publication number
- CN103204613B CN103204613B CN201310127591.4A CN201310127591A CN103204613B CN 103204613 B CN103204613 B CN 103204613B CN 201310127591 A CN201310127591 A CN 201310127591A CN 103204613 B CN103204613 B CN 103204613B
- Authority
- CN
- China
- Prior art keywords
- phosphorus
- sludge
- biological
- chemical
- anaerobic digestion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge, belongs to a technology field for recycling phosphorus in excess sludge. The method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge comprises the following steps of: placing phosphorus containing chemical-biological mixed sludge in a reactor, standing and precipitating for 24 hours at room temperature, and discharging supernate to obtain excess sludge; and adjusting and maintaining pH value of the excess sludge to be 2-8, closing the reactor, and carrying out anaerobic digestion for 7 days at the temperature of 30-50 DEG C, so that both biological phosphorus and chemical phosphorus in the phosphorus containing chemical-biological mixed sludge are released. Compared with the prior art, for the mixed sludge containing aluminium phosphate or iron phosphate, 60-80% of phosphorus in the mixed sludge can be released while the pH value is maintained to be 2-8, and 10-30% more phosphorus is released compared with the condition that the pH value is not adjusted; the digestion rate of an organic matter (in soluble organic carbon) can be 25-60 higher compared with the condition that the pH value is not adjusted; and the method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge can improve phosphorus release rate in anaerobic digestion of the chemical-biological mixed sludge, is beneficial to release of organic matter and reduction of sludge and has significance on sludge recycling and reduction.
Description
Technical field
The present invention relates to a kind of technology reclaiming phosphoric from excess sludge, especially relate to a kind of method extracting phosphoric in phosphorous chemical-biological mixing sludge.
Background technology
Phosphorus is the indispensable inorganic nutritive element of animal and plant growth, in the plasmic composition of organism and metabolism, serve vital role, and Rock Phosphate (72Min BPL) is just becoming more and more rare as a kind of non-renewable natural resources, and the cost of exploitation is also more and more higher.Phosphorus human being's production, use after major part enter in sewage, improper conduct oneself well to comprehend cause body eutrophication, destroy water surrounding.At present, phosphoric in water body is transferred in mud mainly through Enhanced Biological Phosphorus Removal technique (EBPR) by the removal of phosphor in sewage, the object of dephosphorization from sewage is reached by the discharge of excess sludge, but by various factors such as water-inlet carbon source, dissolved oxygen, nitrate, sludge ages, EBPR process operation is also unstable.In order to reach " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) one-level emission standard A (TP≤0.5mg/L), chemical auxiliary dephosphorization technique is used widely in sewage work, and chemical dephosphorization process creates a large amount of chemical sludge and phosphorus content is higher.No matter be Biological Phosphorus Removal Processes or chemical dephosphorization technique, most of phosphoric in final sewage is all enriched in excess sludge, investigation both domestic and external shows that sewage after treatment, the phosphorus of about 85% enters in mud, do not have phosphoric proportion in the sewage plant excess sludge of reinforced phosphor-removing technique to be about 2 ~ 4%, adopt the phosphorous rate of sewage plant excess sludge of reinforced phosphor-removing technique to reach 5 ~ 13%.
Anaerobic Digestion realizes the means that excess sludge stabilization, minimizing and resource utilization the most extensively adopt.A large amount of short chain fatty acids (SCFAs) or methane not only can be produced by anaerobic digestion, and can also excess sludge production be reduced, play sludge reduction effect, the decrement per-cent of anaerobic sludge digestion can reach 40 ~ 60% in the basic conditions.Also can discharge a large amount of nitrogen, phosphoric in excess sludge anaerobic digestion process simultaneously, both can reduce the exploitation of the mankind to nature phosphorus ore to the recycling of ammonia nitrogen, orthophosphoric acid salt in Digestive system, the impact that when Digestive system refluxes, ammonia nitrogen in high density and orthophosphoric acid salt bring denitrification dephosphorization technique can have been reduced again.
The patent of carbon source and nitrogen phosphoric in excess sludge is reclaimed in existing employing anaerobic digestion both at home and abroad at present, major part research mainly concentrates on biological sludge, and for the phosphoric reclaimed in phosphorous chemical-biological mixing sludge, the research improving phosphorus organic efficiency rarely has report, also not relevant patent.Because chemical auxiliary dephosphorization technique is in the widespread use of municipal sewage plant, in research anaerobic digestion process, the release of chemical phosphorus and biological phosphorus, improves the phosphorus content in Digestive system, has very important realistic meaning and economic worth to the resource utilization of later stage nitrogen phosphorus.
Summary of the invention
Object of the present invention is exactly provide a kind of and can discharge to overcome defect that above-mentioned prior art exists the method that biological phosphorus can discharge phosphoric in the phosphorous chemical-biological mixing sludge of extraction of chemical phosphorus.
Object of the present invention can be achieved through the following technical solutions:
Extract a method for phosphoric in phosphorous chemical-biological mixing sludge, the method comprises the following steps:
(1) phosphorous chemical-biological mixing sludge is placed in reactor, at room temperature quiet heavy 24h, discharges supernatant liquor, obtain excess sludge;
(2) regulate and the pH value maintaining excess sludge is 2 ~ 8, closed reactor, anaerobic digestion 7 days under 30 ~ 50 DEG C of conditions, then not only discharge the biological phosphorus in phosphorous chemical-biological mixing sludge but also discharge chemical phosphorus.
Adjustment described in step (2) the raw material that the pH value maintaining excess sludge adopts is the sodium hydroxide solution of 6 ~ 15mol/L and the hydrochloric acid soln of 4 ~ 6mol/L.
Phosphorous chemical-biological mixing sludge described in step (1) be add aluminium salt or molysite carry out chemical auxiliary dephosphorization process after mud.
When the phosphorous chemical-biological mixing sludge described in step (1) be add aluminium salt carry out chemical auxiliary dephosphorization process after mud time, to regulate in step (2) and the pH value maintaining excess sludge is 2 ~ 5;
When the phosphorous chemical-biological mixing sludge described in step (1) be add molysite carry out chemical auxiliary dephosphorization process after mud time, to regulate in step (2) and the pH value maintaining excess sludge is 6 ~ 8.
It is consider that pH value precipitates on the impact of biological phosphorus in excess sludge anaerobic digestion process and pH value the impact releasing phosphorus on chemical phosphorus that the present invention can discharge the anaerobic digestion techniques that biological phosphorus can discharge again its chemical phosphorus simultaneously.
In the process of carrying out anaerobic digestion, use the change of pH in pH meter monitoring reactor, and regulate and maintain pH in specified range.
Know-why of the present invention is: under acid-base condition in anaerobic sludge digestion process, and microorganism cells can not maintain equilibrium osmotic pressure and be destroyed, and promotes intracellular organic matter stripping, organism in anaerobic digestion supernatant liquor, concentration of nitrogen and phosphorus are increased.And chemical phosphorus in anaerobic digestion process because the pH maintained is different or organic reaction in chemical substance and mud, have in various degree release phosphorus.It can thus be appreciated that, maintain pH and carry out anaerobic digestion to containing the excess sludge of chemical phosphorus in certain scope, can be beneficial to simultaneously microorganism cells release phosphorus and chemical sludge release phosphorus, thus improve the phosphorus concentration in anaerobic digestion supernatant liquor.
Compared with prior art, the present invention has the following advantages and beneficial effect:
(1) present method can make the phosphorus in biological sludge and the Phosphurus release in chemical sludge simultaneously, improves the phosphorus concentration in supernatant liquor, is conducive to the rate of recovery improving later stage nitrogen phosphor resource, realizes the recycling to excess sludge.
(2) under the method condition, in anaerobic digestion 7 days, the decrement per-cent of total suspended solid (TSS) can reach 15 ~ 30%, comprises the decrement of volatile suspended solid (VSS) and the dissolving of part inorganics, thus decreases the disposal amount of excess sludge.
(3) under present method condition, by the anaerobic digestion of phosphorous chemical-biological mixing sludge, compared with pure biological sludge anaerobic digestion, in supernatant liquor, the generation rule of organic stripping, volatile acid is basically identical, in anaerobic digestion process, all the organism in mud can be made to disengage, not affect follow-up organic produce acid and methane phase.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
(1) get respectively 400mL concentrate after pure biological sludge (total suspended solid concentration is 11.5g/L, volatile suspended solid concentration is 8.5g/L) add in different reactors, pH=3 in anaerobic digestion process is maintained with the hydrochloric acid soln of 6mol/L and the sodium hydroxide solution of 6mol/L, do the biological sludge anaerobic digestion test of not control ph simultaneously, inflated with nitrogen 0.5min, closed reactor anaerobic digestion 7 days under 35 DEG C of conditions.
Getting the mixing sludge containing aluminium salt after 400mL concentrates respectively adds in different reactors, and carry out anaerobic digestion test, test method is the same.
(2) every 24h gets 1 sample, surveys the concentration of orthophosphoric acid salt, dissolved organic carbon (STOC), voltaile fatty acid (VFA) in two kinds of anaerobic sludge digestion supernatant liquors.
(3) anaerobic digestion surveys TSS concentration and VSS concentration in 7 days afterwards.
(4) pure biological sludge and the orthophosphoric acid salt concentration contained in the mixing sludge anaerobic digestion supernatant liquor of aluminium salt is contrasted, can find out that maintaining pH=3 can make the biological phosphorus in mixing sludge and chemical phosphorus all have release, and phosphorus during uncomfortable pH in aluminum phosphate can not disengage.By formula (1), (2), (3) can calculate mixing sludge under condition of different pH total release phosphorus rate, release phosphorus rate comprising the phosphorus rate of releasing of biological sludge and chemical phosphorus.
Wherein: P
tthe concentration of muddy water total phosphorus in-mixing sludge, with PO
4 3-p counts, mg/L;
P
mL---close the PO in anaerobic sludge digestion supernatant liquor
4 3--P concentration, mg/L;
P
bL---the PO in biological sludge anaerobic digestion supernatant liquor
4 3--P concentration, mg/L;
Maintain pH=3, in pure biological sludge anaerobic digestion supernatant liquor orthophosphoric acid salt concentration ratio not control pH exceed 20%; For aluminum phosphate, maintaining pH=3, to release phosphorus rate than not control ph high by 5%; Comprehensive pure biological sludge and chemical sludge, the phosphorus rate of releasing maintaining pH=3 mixing sludge compares not control ph and exceeds 25%, and can disengage the phosphorus of in mixing sludge total phosphorus 70 ~ 80%, wherein biological sludge releases phosphorus 70%, and the phosphorus rate of releasing of aluminum phosphate is 5%.
(5) anaerobic digestion records TSS concentration and shows after 7 days, and control ph anaerobic digestion can not make TSS decrement 5% in the mixing sludge of phosphoric acid aluminium for 7 days, maintains pH=3 and can make TSS decrement 13% in mixing sludge.
(6) contrast the concentration of STOC, the VFA in the mixing sludge anaerobic digestion supernatant liquor of pure biological sludge and phosphoric acid aluminium, under identical pH condition, the organic concentration that two kinds of mud disengages in anaerobic digestion process is substantially identical.Compared with not control ph, control pH is not high by 50% to maintain STOC concentration ratio in pH=3 mixing sludge anaerobic digestion supernatant liquor.
Embodiment 2
(1) get respectively 400mL concentrate after pure biological sludge (total suspended solid concentration is 10.8g/L, volatile suspended solid concentration is 8.1g/L) add in different reactors, pH=7 in anaerobic digestion process is maintained with the hydrochloric acid soln of 6mol/L and the sodium hydroxide solution of 6mol/L, inflated with nitrogen 0.5min, closed reactor anaerobic digestion 7 days under 35 DEG C of conditions.
Getting the mixing sludge that 400mL concentrates rear phosphoric acid iron respectively adds in different reactors, and carry out anaerobic digestion test, test method is the same.
(2) every 24h gets 1 sample, surveys orthophosphoric acid salt, STOC, VFA concentration in two kinds of anaerobic sludge digestion supernatant liquors.
(3) mixing sludge anaerobic digestion surveys TSS and VSS concentration in 7 days afterwards.
(4) with embodiment 1, utilize formula (1), (2), (3) can calculate mixing sludge total release phosphorus rate, release phosphorus rate comprising the phosphorus rate of releasing of biological sludge and tertiary iron phosphate.
Contrast the orthophosphoric acid salt concentration in the mixing sludge anaerobic digestion supernatant liquor of pure biological sludge and phosphoric acid iron, can find out and maintain the phosphorus that pH=7 can discharge in mixing sludge 80%, wherein biological sludge releases phosphorus rate is 70%, and phosphorus rate released by tertiary iron phosphate is about 10%.
(5) the mixing sludge anaerobic digestion of phosphoric acid iron records TSS concentration after 7 days and VSS concentration shows, maintains pH=7 and can make TSS decrement 5%, VSS decrement about 10% in the mixing sludge of phosphoric acid iron.
(6) contrast the concentration of STOC, the VFA in the mixing sludge anaerobic digestion supernatant liquor of pure biological sludge and phosphoric acid iron, during maintenance pH=7, the mixing sludge of phosphoric acid iron is more or less the same in STOC, VFA concentration and pure biological sludge anaerobic digestion supernatant liquor in anaerobic digestion supernatant liquor.
Embodiment 3
Extract a method for phosphoric in phosphorous chemical-biological mixing sludge, the method comprises the following steps:
(1) by phosphorous chemical-biological mixing sludge (for add aluminium salt carry out chemical auxiliary dephosphorization process after mud) be placed in reactor, at room temperature quiet heavy 24h, discharge supernatant liquor, obtain excess sludge;
(2) sodium hydroxide solution of 6mol/L and the hydrochloric acid soln of 4mol/L is adopted to regulate and the pH value maintaining excess sludge is 2, closed reactor, anaerobic digestion 7 days under 30 DEG C of conditions, then not only discharge the biological phosphorus in phosphorous chemical-biological mixing sludge but also discharge chemical phosphorus.
Embodiment 4
Extract a method for phosphoric in phosphorous chemical-biological mixing sludge, the method comprises the following steps:
(1) by phosphorous chemical-biological mixing sludge (for add aluminium salt carry out chemical auxiliary dephosphorization process after mud) be placed in reactor, at room temperature quiet heavy 24h, discharge supernatant liquor, obtain excess sludge;
(2) sodium hydroxide solution of 15mol/L and the hydrochloric acid soln of 6mol/L is adopted to regulate and the pH value maintaining excess sludge is 5, closed reactor, anaerobic digestion 7 days under 50 DEG C of conditions, then not only discharge the biological phosphorus in phosphorous chemical-biological mixing sludge but also discharge chemical phosphorus.
Embodiment 5
Extract a method for phosphoric in phosphorous chemical-biological mixing sludge, the method comprises the following steps:
(1) by phosphorous chemical-biological mixing sludge (for add aluminium salt carry out chemical auxiliary dephosphorization process after mud) be placed in reactor, at room temperature quiet heavy 24h, discharge supernatant liquor, obtain excess sludge;
(2) sodium hydroxide solution of 10mol/L and the hydrochloric acid soln of 5mol/L is adopted to regulate and the pH value maintaining excess sludge is 4, closed reactor, anaerobic digestion 7 days under 40 DEG C of conditions, then not only discharge the biological phosphorus in phosphorous chemical-biological mixing sludge but also discharge chemical phosphorus.
Embodiment 6
Extract a method for phosphoric in phosphorous chemical-biological mixing sludge, the method comprises the following steps:
(1) by phosphorous chemical-biological mixing sludge (for add molysite carry out chemical auxiliary dephosphorization process after mud) be placed in reactor, at room temperature quiet heavy 24h, discharge supernatant liquor, obtain excess sludge;
(2) sodium hydroxide solution of 6mol/L and the hydrochloric acid soln of 4mol/L is adopted to regulate and the pH value maintaining excess sludge is 6, closed reactor, anaerobic digestion 7 days under 30 DEG C of conditions, then not only discharge the biological phosphorus in phosphorous chemical-biological mixing sludge but also discharge chemical phosphorus.
Embodiment 7
Extract a method for phosphoric in phosphorous chemical-biological mixing sludge, the method comprises the following steps:
(1) by phosphorous chemical-biological mixing sludge (for add molysite carry out chemical auxiliary dephosphorization process after mud) be placed in reactor, at room temperature quiet heavy 24h, discharge supernatant liquor, obtain excess sludge;
(2) sodium hydroxide solution of 15mol/L and the hydrochloric acid soln of 6mol/L is adopted to regulate and the pH value maintaining excess sludge is 8, closed reactor, anaerobic digestion 7 days under 50 DEG C of conditions, then not only discharge the biological phosphorus in phosphorous chemical-biological mixing sludge but also discharge chemical phosphorus.
Embodiment 8
Extract a method for phosphoric in phosphorous chemical-biological mixing sludge, the method comprises the following steps:
(1) by phosphorous chemical-biological mixing sludge (for add molysite carry out chemical auxiliary dephosphorization process after mud) be placed in reactor, at room temperature quiet heavy 24h, discharge supernatant liquor, obtain excess sludge;
(2) sodium hydroxide solution of 9mol/L and the hydrochloric acid soln of 5mol/L is adopted to regulate and the pH value maintaining excess sludge is 7, closed reactor, anaerobic digestion 7 days under 40 DEG C of conditions, then not only discharge the biological phosphorus in phosphorous chemical-biological mixing sludge but also discharge chemical phosphorus.
Claims (2)
1. extract a method for phosphoric in phosphorous chemical-biological mixing sludge, it is characterized in that, the method comprises the following steps:
(1) phosphorous chemical-biological mixing sludge is placed in reactor, at room temperature quiet heavy 24h, discharges supernatant liquor, obtain excess sludge;
(2) regulate and the pH value maintaining excess sludge is 2 ~ 8, closed reactor, anaerobic digestion 7 days under 30 ~ 50 DEG C of conditions, then not only discharge the biological phosphorus in phosphorous chemical-biological mixing sludge but also discharge chemical phosphorus;
Phosphorous chemical-biological mixing sludge described in step (1) be add aluminium salt or molysite carry out chemical auxiliary dephosphorization process after mud;
When the phosphorous chemical-biological mixing sludge described in step (1) be add aluminium salt carry out chemical auxiliary dephosphorization process after mud time, to regulate in step (2) and the pH value maintaining excess sludge is 2 ~ 5;
When the phosphorous chemical-biological mixing sludge described in step (1) be add molysite carry out chemical auxiliary dephosphorization process after mud time, to regulate in step (2) and the pH value maintaining excess sludge is 6 ~ 8.
2. a kind of method extracting phosphoric in phosphorous chemical-biological mixing sludge according to claim 1, it is characterized in that, the adjustment described in step (2) the raw material that the pH value maintaining excess sludge adopts is the sodium hydroxide solution of 6 ~ 15mol/L and the hydrochloric acid soln of 4 ~ 6mol/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310127591.4A CN103204613B (en) | 2013-04-12 | 2013-04-12 | Method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310127591.4A CN103204613B (en) | 2013-04-12 | 2013-04-12 | Method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103204613A CN103204613A (en) | 2013-07-17 |
| CN103204613B true CN103204613B (en) | 2015-01-14 |
Family
ID=48752055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310127591.4A Active CN103204613B (en) | 2013-04-12 | 2013-04-12 | Method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103204613B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103755114B (en) * | 2014-02-21 | 2015-07-08 | 烟台大学 | Concentrating and phosphorus removing method for excess sludge |
| CN108046557B (en) * | 2017-09-20 | 2021-02-09 | 同济大学 | Method for promoting phosphorus release and gas production of sludge containing phosphate precipitate at room temperature |
| CN109110891A (en) * | 2018-09-04 | 2019-01-01 | 南京师范大学 | A kind of recycling of coagulant original position and recirculating process based on CEPS alkalinity anaerobic fermentation |
| CN113582498B (en) * | 2021-07-12 | 2022-12-06 | 同济大学 | Method for recovering phosphorus from sludge rich in chemical phosphorus precipitates by using high-protein biomass wastes |
| CN114291988B (en) * | 2022-01-18 | 2023-10-13 | 太原理工大学 | Biological phosphorus release method for improving bioavailability of phosphorus in sludge |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101638269A (en) * | 2008-08-01 | 2010-02-03 | 艾博特(厦门)设备工程有限公司 | Method for treating excess sludge |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012011375A (en) * | 2010-06-04 | 2012-01-19 | Blue Aqua Industry Kk | Method and apparatus for treating wastewater |
-
2013
- 2013-04-12 CN CN201310127591.4A patent/CN103204613B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101638269A (en) * | 2008-08-01 | 2010-02-03 | 艾博特(厦门)设备工程有限公司 | Method for treating excess sludge |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2012-11375A 2012.01.19 * |
| pH对剩余污泥中氮、磷释放的影响;员建等;《中国给水排水》;20100131;第26卷(第1期);第96页最后一行-97页1.2节、2.2节 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103204613A (en) | 2013-07-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103204613B (en) | Method for extracting phosphorus in phosphorus containing chemical-biological mixed sludge | |
| CN103739169B (en) | Nitrogen and phosphorus removal method for biological sewage treatment | |
| CN108046557B (en) | Method for promoting phosphorus release and gas production of sludge containing phosphate precipitate at room temperature | |
| CN110395800B (en) | Preparation method and application of external carbon source for denitrification | |
| CN101555077B (en) | Method for treating highly concentrated ammonian wastewater with poor biodegradability by using a multiple-technique combination | |
| EP3018105B1 (en) | Enhanced sewage biological nitrogen and phosphorus removal method based on polyhydroxyalkanoates metabolic regulation | |
| CN103936249B (en) | Improve the method that phosphorous chemical-biological mixing sludge anaerobically fermenting releases phosphorus rate | |
| CN103553212B (en) | A kind of high formaldehyde high concentrated organic wastewater biological treatment | |
| CN103570158B (en) | A kind of recovering rare earth from Rare Earth Production waste water and the method for ammonia nitrogen qualified discharge | |
| CN103466841B (en) | Ammonia-nitrogen wastewater treatment method | |
| CN101439897A (en) | Preparation of composite flocculant for recovering phosphor in sewerage and phosphor recovering process | |
| US20230008207A1 (en) | Method for recovering phosphorus from sludge rich in chemical phosphorus precipitates using high-protein biomass waste | |
| CN104609688A (en) | Method for improving phosphorus release rate of iron phosphate-containing sludge during anaerobic fermentation | |
| CN204417293U (en) | A kind of denitrification dephosphorization apparatus | |
| CN105461169A (en) | Wastewater treatment process for pig farm | |
| CN101723345A (en) | Method for recovering phosphorus from phosphorus containing sludge | |
| CN104556631A (en) | Recycling treatment method for phosphorus-enriched aerobic granular sludge | |
| CN105036489A (en) | Livestock/poultry culture wastewater deep denitrification and dephosphorization standard treatment device and process | |
| CN105541008A (en) | An efficient denitrifying and carbon-removing device for culture wastewater anaerobic biogas slurry with a low C/N ratio and a process thereof | |
| CN103755108B (en) | Municipal wastewater purification treatment method | |
| CN105417765B (en) | A kind of municipal sewage organic carbon enriching and recovering utilizes device and its application method | |
| CN203007087U (en) | Pig-raising wastewater treatment system | |
| CN104609651B (en) | A kind of Large-scale pig farm advanced waste treatment system | |
| CN104743734A (en) | Coupled sewage biological nitrogen and phosphorus removal and phosphate recovery method | |
| CN109626729A (en) | A kind of method that the recycling of sanitary sewage organic matter couples iron autotrophic denitrification/nitrification denitrogenation and dephosphorization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |