CN104402102A - Enhanced pre-treatment coagulant for printing and dyeing wastewater and preparation method of enhanced pre-treatment coagulant - Google Patents

Enhanced pre-treatment coagulant for printing and dyeing wastewater and preparation method of enhanced pre-treatment coagulant Download PDF

Info

Publication number
CN104402102A
CN104402102A CN201410746787.6A CN201410746787A CN104402102A CN 104402102 A CN104402102 A CN 104402102A CN 201410746787 A CN201410746787 A CN 201410746787A CN 104402102 A CN104402102 A CN 104402102A
Authority
CN
China
Prior art keywords
waste water
weight parts
coagulating agent
dyeing waste
primary treatment
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.)
Granted
Application number
CN201410746787.6A
Other languages
Chinese (zh)
Other versions
CN104402102B (en
Inventor
仝武刚
梅荣武
李欲如
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Environmental Science Research and Design Institute
Original Assignee
Zhejiang Environmental Science Research and Design Institute
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zhejiang Environmental Science Research and Design Institute filed Critical Zhejiang Environmental Science Research and Design Institute
Priority to CN201410746787.6A priority Critical patent/CN104402102B/en
Publication of CN104402102A publication Critical patent/CN104402102A/en
Application granted granted Critical
Publication of CN104402102B publication Critical patent/CN104402102B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • C02F1/66—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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/308—Dyes; Colorants; Fluorescent agents

Landscapes

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

Abstract

The invention discloses enhanced pre-treatment coagulant for printing and dyeing wastewater. The enhanced pre-treatment coagulant comprises the following raw materials in parts by weight: 35-45 parts of polymeric ferric sulfate, 1-5 parts of aluminum chloride, 0.1-0.2 parts of oxidizing agents and 50-60 parts of waste acid. The invention further discloses a preparation method of the enhanced pre-treatment coagulant for the printing and dyeing wastewater. The preparation method comprises the following steps that (1) 35-45 weight parts of liquid polymeric ferric sulfate and 1-5 weight parts of solid aluminum chloride are mixed into a solution; (2) 0.1-0.2 weight parts of the oxidizing agents are added; (3) the pH (potential of hydrogen) value of the solution is adjusted to be 2-3 through 50-60 weight parts of the waste acid, and the enhanced pre-treatment coagulant for the printing and dyeing wastewater is obtained. The preparation method of the enhanced pre-treatment coagulant for the printing and dyeing wastewater has a simpler preparation process than a traditional polymeric aluminum and iron production process, can make full use of the waste acid to adjust the acidity and a combination oxidization function of the waste acid and polymeric aluminum ferric sulfate, gives a full play to efficient treatment capacity and is convenient to use and popularize.

Description

A kind of dyeing waste water strenuous primary treatment coagulating agent and preparation method thereof
Technical field
The present invention relates to environmental chemistry water-treatment technology field, be specifically related to a kind of dyeing waste water strenuous primary treatment coagulating agent and preparation method thereof.
Background technology
Coagulation is conventional treatment method in dyeing waste water pre-treatment, and the COD concentration of general dyeing waste water is between 1000 ~ 4000mg/L, and the COD after coagulation pretreatment can remove 30 ~ 50%, for subsequent biochemical provides good treatment condition.
Existing dyeing waste water coagulated agent mainly comprises aluminium system and ferric flocculant, is characterized in that market supply is large, low price, treatment effect is stablized, particularly ferrous sulfate not only has coagulation, also has decolorization, it can be used as the first-selection of coagulating agent at a lot of printing and dyeing enterprise.But because its sludge quantity is large, COD clearance is lower, and along with the printing and dyeing raising of emission standard and the raising of printing and dyeing sludge cost of disposal, printing and dyeing enterprise increases the market requirement of novel coagulated agent.
The medicament substituting ferrous sulfate at present has PAC (polymerize aluminum chloride), PFS (bodied ferric sulfate), PFC (poly-ferric chloride) and PFAS (PAFS).Wherein compare with PFC (poly-ferric chloride) with PAC (polymerize aluminum chloride), PFS (bodied ferric sulfate), it is fast that PAFS forms flco relatively, deposit seeds is large, and settling velocity is fast, and coagulation is obviously better than other three kinds of medicaments.Meanwhile, PAFS is little on pH impact, and turbidity removal rate is comparatively strong, and without too large corrodibility.
Publication number is the production technique that the Chinese patent literature of CN1337356A discloses a kind of aluminium iron sulfate polymer as composite water purifying agent, producing with vitriol works after sulfuric acid is raw material containing ferric oxide waste residue, according to stoichiometry, water, slag, sulfuric acid are added in reactor successively and react, the water then adding isodose dilutes, and the reactant after dilution enters subsider, add a small amount of flocculation agent natural subsidence, solid-liquid separation, more above-mentioned clear liquid is squeezed into aggregation container, add H 2o 2be polymerized with clear liquid Quick Oxidation, obtain PAFS finished fluid.Above-mentioned finished fluid is through dehydration by evaporation, and spontaneous nucleation after discharging, is then broken into granular or powdery, obtains solid polymeric aluminum ferric sulfate.
Such scheme is raw material with waste residue, and production cost is low, and technique is simple; Aluminium, iron compound, effect of disposing of sewage is better than simple substance product, can reach the treatment of wastes with processes of wastes against one another, and in water treatment procedure, have flocs unit form speed soon, Floc density is large, the features such as settling velocity is fast.
Also have a kind of production technique of common PAFS in addition, within after adding the reaction of ferrous sulfate, sulfuric acid and Starso low rate mixing first in a kettle. static 30 minutes, filter and remove impurity, be prepared into A material; Within static 60 minutes, filter add hydrochloric acid, calcium aluminate powder, the reaction of iron aluminium stone flour low rate mixing again in another reactor after and remove impurity, be prepared into B material; A material and B are expected to add low rate mixing in the 3rd reactor, adds dioxide peroxide and the static building-up reactions of chlorinated lime 60 minutes simultaneously respectively.
For the dyeing waste water of COD concentration between 1000 ~ 4000mg/L, the PAFS adopting above-mentioned existing method to prepare carries out coagulation pretreatment to dyeing waste water, although COD clearance can reach 60% after process, but the existing method preparing PAFS is too complicated, general water purification agent factory adopts less, is difficult to be promoted.
Summary of the invention
The invention provides a kind of dyeing waste water strenuous primary treatment coagulating agent, production cost is low, and COD clearance is high.
The technical scheme that the present invention deals with problems is: a kind of dyeing waste water strenuous primary treatment coagulating agent, and the weight part composition of its raw material comprises:
Wherein, bodied ferric sulfate is liquid, and aluminum chloride and oxygenant are solid.
Dyeing waste water strenuous primary treatment coagulating agent of the present invention is used for the dyeing waste water strenuous primary treatment that COD is 1000 ~ 4000mg/L.
Contriver finds through great many of experiments, and spent acid consumption has larger impact to final treatment effect, and must add appropriate spent acid guarantee has certain basicity and good flocculating effect.If it is very few to add spent acid, A1 3+and Fe 3+hydrolysis reaction just carry out more thorough, the basicity of final product can be excessive, cause generate precipitation and unstable.Add spent acid amount too much, then generate Al 2(SO 4) 3and Fe 2(SO 4) 3probability rise, Al 3+and Fe 3+hydrolysis tendency reduces, and the basicity of final product also decreases.
Except the impact of spent acid consumption, the proportioning of other each raw materials plays vital effect to final coagulation effect, coordinated between them.
As preferably, the weight part composition of the raw material of dyeing waste water strenuous primary treatment coagulating agent of the present invention comprises:
As preferred further, the weight part composition of the raw material of dyeing waste water strenuous primary treatment coagulating agent of the present invention comprises:
Aluminum chloride can not only provide Al 3+, and be oxidized formation polymkeric substance through sodium perchlorate, improve the basicity of this medicament.And the basicity of the aluminium such as Tai-Ace S 150, aluminum nitrate salt is too low, coagulation condition requirement can not be met.
Described oxygenant can select the oxygenant such as hydrogen peroxide, potassium permanganate, but the present invention focuses on economical and practical, and therefore preferably, described oxygenant is sodium chlorate.
(Fe is mainly containing a small amount of reducing substances in bodied ferric sulfate 2+), sodium chlorate is oxidized wherein reducing substances as a strong oxidizer.Sodium chlorate has mainly transformed the reducing substances in bodied ferric sulfate in oxidising process, makes the ferrous ion in bodied ferric sulfate fully be converted into the iron ion of triple bond, enhanced coagulation effect.
The dyeing waste water strenuous primary treatment coagulating agent that formula of the present invention obtains finally is in a liquid state, and the clearance of dyeing waste water strenuous primary treatment coagulating agent COD of the present invention is high, have employed spent acid as raw material, has carried out again utilizing, reduce cost to refuse.
As preferably, described spent acid COD is 1000 ~ 3000mg/L, and pH value is 1 ~ 2.
As preferably, described spent acid is waste hydrochloric acid or Waste Sulfuric Acid.
Organic Materials of Spent acid too high levels can cause in use in organic substance residues and water body, the removal of impact process water body COD.
General dyeing waste water is alkaline water, pH value is about 8 ~ 9, adding spent acid object is play the effect of adjustment pH value in coagulation process, mechanism due to acid has certain oxidisability, therefore can play some organism of assistant degradation in coagulation process, make coagulating agent and acid play synchronous degradation COD.
Present invention also offers a kind of preparation method of dyeing waste water strenuous primary treatment coagulating agent, comprise the following steps:
(1) the liquid polymeric ferric sulfate of 35 ~ 45 weight parts and the solid aluminum chloride of 1 ~ 5 weight part are mixed into solution;
(2) the solid sodium chlorate of 0.1 ~ 0.2 weight part is added;
(3) adjust solution ph to 2 ~ 3 with the spent acid of 50 ~ 60 weight parts, namely obtain a kind of dyeing waste water strenuous primary treatment coagulating agent.
As preferably, the consumption of described bodied ferric sulfate is 35 ~ 40 weight parts; The consumption of described aluminum chloride is 4 ~ 5 weight parts; Described oxygenant is solid sodium chlorate, and its consumption is 0.15 ~ 0.2 weight part; Described spent acid is waste hydrochloric acid, and its consumption is 50 ~ 55 weight parts.
As preferably, the consumption of described bodied ferric sulfate is 35 ~ 38 weight parts; The consumption of described aluminum chloride is 4 ~ 5 weight parts; Described oxygenant is solid sodium chlorate, and its consumption is 0.18 ~ 0.2 weight part; Described spent acid is Waste Sulfuric Acid, and its consumption is 50 ~ 52 weight parts.
The preparation method of dyeing waste water strenuous primary treatment coagulating agent of the present invention, relative conventional polymeric ferro-aluminum production technique, preparation process is more simple, makes full use of spent acid and regulates acidity and the co-oxidation effect with PAFS, play medicament high treatment capacity, easy to utilize.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
By 35 part by weight of liquid bodied ferric sulfates and the mixing of 5 parts by weight solids aluminum chloride, and then add 0.2 parts by weight solids sodium chlorate, by the spent acid adjusted to ph of 50 weight parts to 2 ~ 3, obtain coagulating agent of the present invention.
The coagulating agent obtained and PAC (polymerize aluminum chloride), PFAS (PAFS) are compared, under the condition that dosage is identical, process same dyeing waste water, treatment effect is as follows:
Embodiment 2
By the mixing of the solid aluminum chloride of the liquid polymeric ferric sulfate of 35 weight parts and 5 weight parts, and then add the solid sodium chlorate of 0.2 weight part, by the spent acid adjusted to ph of 50 weight parts to 2 ~ 3, obtain coagulating agent of the present invention,
The coagulating agent obtained and PAC (polymerize aluminum chloride), PFAS (PAFS) are compared, under the condition that dosage is identical, process same dyeing waste water, treatment effect is as follows:
Embodiment 3
By the mixing of the solid aluminum chloride of the liquid polymeric ferric sulfate of 45 weight parts and 1 weight part, and then add the solid sodium chlorate of 0.1 weight part, by the spent acid adjusted to ph of 60 weight parts to 2 ~ 3, obtain coagulating agent of the present invention.
The coagulating agent obtained and PAC (polymerize aluminum chloride), PFAS (PAFS) are compared, under the condition that dosage is identical, process same dyeing waste water, treatment effect is as follows:
Embodiment 4
By the mixing of the solid aluminum chloride of the liquid polymeric ferric sulfate of 40 weight parts and 4 weight parts, and then add the solid sodium chlorate of 0.15 weight part, by the spent acid adjusted to ph of 55 weight parts to 2 ~ 3, obtain coagulating agent of the present invention.
The coagulating agent obtained and PAC (polymerize aluminum chloride), PFAS (PAFS) are compared, under the condition that dosage is identical, process same dyeing waste water, treatment effect is as follows:

Claims (9)

1. a dyeing waste water strenuous primary treatment coagulating agent, the weight part composition of its raw material comprises:
2. dyeing waste water strenuous primary treatment coagulating agent as claimed in claim 1, is characterized in that, the weight part composition of its raw material comprises:
3. dyeing waste water strenuous primary treatment coagulating agent as claimed in claim 4, is characterized in that, the weight part composition of its raw material comprises:
4. the dyeing waste water strenuous primary treatment coagulating agent as described in any one of claims 1 to 3, is characterized in that, the COD of described spent acid is 1000 ~ 3000mg/L, and pH value is 1 ~ 2.
5. dyeing waste water strenuous primary treatment coagulating agent as claimed in claim 4, it is characterized in that, described spent acid is waste hydrochloric acid or Waste Sulfuric Acid.
6. the dyeing waste water strenuous primary treatment coagulating agent as described in any one of claims 1 to 3, is characterized in that, described oxygenant is solid sodium chlorate.
7. a preparation method for dyeing waste water strenuous primary treatment coagulating agent, comprises the following steps:
(1) the liquid polymeric ferric sulfate of 35 ~ 45 weight parts and the solid aluminum chloride of 1 ~ 5 weight part are mixed into solution;
(2) oxygenant of 0.1 ~ 0.2 weight part is added;
(3) adjust solution ph to 2 ~ 3 with the spent acid of 50 ~ 60 weight parts, namely obtain a kind of dyeing waste water strenuous primary treatment coagulating agent.
8. the preparation method of dyeing waste water strenuous primary treatment coagulating agent as claimed in claim 7, it is characterized in that, the consumption of described bodied ferric sulfate is 35 ~ 40 weight parts; The consumption of described aluminum chloride is 4 ~ 5 weight parts; Described oxygenant is solid sodium chlorate, and its consumption is 0.15 ~ 0.2 weight part; Described spent acid is waste hydrochloric acid, and its consumption is 50 ~ 55 weight parts.
9. the preparation method of dyeing waste water strenuous primary treatment coagulating agent as claimed in claim 7, it is characterized in that, the consumption of described bodied ferric sulfate is 35 ~ 38 weight parts; The consumption of described aluminum chloride is 4 ~ 5 weight parts; Described oxygenant is solid sodium chlorate, and its consumption is 0.18 ~ 0.2 weight part; Described spent acid is Waste Sulfuric Acid, and its consumption is 50 ~ 52 weight parts.
CN201410746787.6A 2014-12-09 2014-12-09 A kind of dyeing waste water strenuous primary treatment coagulant and preparation method thereof Active CN104402102B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410746787.6A CN104402102B (en) 2014-12-09 2014-12-09 A kind of dyeing waste water strenuous primary treatment coagulant and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410746787.6A CN104402102B (en) 2014-12-09 2014-12-09 A kind of dyeing waste water strenuous primary treatment coagulant and preparation method thereof

Publications (2)

Publication Number Publication Date
CN104402102A true CN104402102A (en) 2015-03-11
CN104402102B CN104402102B (en) 2016-10-05

Family

ID=52639789

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410746787.6A Active CN104402102B (en) 2014-12-09 2014-12-09 A kind of dyeing waste water strenuous primary treatment coagulant and preparation method thereof

Country Status (1)

Country Link
CN (1) CN104402102B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104709989A (en) * 2015-03-19 2015-06-17 韩山师范学院 Wastewater treatment coagulant and preparation method thereof
CN112978883A (en) * 2019-12-17 2021-06-18 大唐环境产业集团股份有限公司 Composite medicament for desulfurization wastewater treatment and preparation method thereof

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1448343A (en) * 2003-01-23 2003-10-15 江西省科学院能源研究所 Compounded flocculant and its prep.
CN1762848A (en) * 2005-08-26 2006-04-26 南京工业大学 Coagulant for disposing dying waste water and its production method
CN101445286A (en) * 2008-12-26 2009-06-03 南京师范大学 Method for producing water treatment agent polyaluminium chloride from industrial waste residues
KR20090109264A (en) * 2008-04-15 2009-10-20 동우 화인켐 주식회사 Method for recovering of dyeing solution from waste solution for polarizing film and method for preparing polarizing film using the recovered dyeing solution
CN101885525A (en) * 2009-05-11 2010-11-17 山东德科生物科技开发有限公司 Production method of polymerized aluminium ferric chloride sulphate
CN103030198A (en) * 2012-11-29 2013-04-10 韩晓刚 Preparation method of dyeing wastewater decolorizing coagulant
CN103466767A (en) * 2013-03-19 2013-12-25 绍兴伊诺环保科技有限公司 Coagulant for treating printing and dyeing wastewater and production method thereof
CN104108775A (en) * 2014-07-10 2014-10-22 杭州电子科技大学 Composite reagent for treating recycled water of printing and dyeing wastewater and application method of composite reagent

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1448343A (en) * 2003-01-23 2003-10-15 江西省科学院能源研究所 Compounded flocculant and its prep.
CN1762848A (en) * 2005-08-26 2006-04-26 南京工业大学 Coagulant for disposing dying waste water and its production method
KR20090109264A (en) * 2008-04-15 2009-10-20 동우 화인켐 주식회사 Method for recovering of dyeing solution from waste solution for polarizing film and method for preparing polarizing film using the recovered dyeing solution
CN101445286A (en) * 2008-12-26 2009-06-03 南京师范大学 Method for producing water treatment agent polyaluminium chloride from industrial waste residues
CN101885525A (en) * 2009-05-11 2010-11-17 山东德科生物科技开发有限公司 Production method of polymerized aluminium ferric chloride sulphate
CN103030198A (en) * 2012-11-29 2013-04-10 韩晓刚 Preparation method of dyeing wastewater decolorizing coagulant
CN103466767A (en) * 2013-03-19 2013-12-25 绍兴伊诺环保科技有限公司 Coagulant for treating printing and dyeing wastewater and production method thereof
CN104108775A (en) * 2014-07-10 2014-10-22 杭州电子科技大学 Composite reagent for treating recycled water of printing and dyeing wastewater and application method of composite reagent

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104709989A (en) * 2015-03-19 2015-06-17 韩山师范学院 Wastewater treatment coagulant and preparation method thereof
CN112978883A (en) * 2019-12-17 2021-06-18 大唐环境产业集团股份有限公司 Composite medicament for desulfurization wastewater treatment and preparation method thereof

Also Published As

Publication number Publication date
CN104402102B (en) 2016-10-05

Similar Documents

Publication Publication Date Title
CN102295335B (en) Flocculating-agent composition
CN100554177C (en) A kind of preparation method of polymerized ferric-aluminum chloride composite coagulating agent
CN104085969B (en) Spent acid is utilized to produce the method for compound polynary flocculant poly silicic acid chloro sulphuric acid ferro-aluminum
CN101823721A (en) Method for producing poly silicate aluminium ferric flocculating agent by utilizing coal gangue
CN102757119B (en) Preparation method of composite type inorganic polymeric flocculating agent and application thereof
CN103787537B (en) A kind for the treatment of process of sewage and application thereof
CN106517577B (en) The treatment process of acidic arsenic-containing waste water
CN106904807A (en) A kind of method that phosphorus is reclaimed from dewatered sludge
CN102120623A (en) Preparation method of polysilicate aluminium ferric flocculant
CN101531417B (en) Inorganic composite floculant, its preparation method and use in treating high-concentration dye-printing desizing waste water
CN102464440B (en) Method for carrying out decrement on physicochemical and biochemical mixed sludge
CN104743750B (en) Method for treating pulp papermaking industrial wastewater
Waite et al. Oxidation and coagulation of wastewater effluent utilizing ferrate (VI) ion
CN111003910A (en) Method for treating waste sulfonated mud from drilling
CN112850867A (en) Deep defluorination medicament and preparation method thereof
CN104512951A (en) Method for co-production of ploysilicate aluminium ferric sulphate and waste water treatment powder by PAC (poly aluminum chloride) residues
CN101492192B (en) Coagulating agent for treating wastewater containing fluorine and use process thereof
CN101717123B (en) Method for preparing modified poly-ferric chloride coagulant
CN104402102B (en) A kind of dyeing waste water strenuous primary treatment coagulant and preparation method thereof
CN108101184A (en) A kind of sewage-treating agent and preparation method thereof
CN1958462A (en) Method for preparing potassium ferrate by using waste liquid from acid washing steel
KR101276507B1 (en) The appuratus of removing total phosphorus in wastewater using oxidaition process
CN108314154A (en) A kind of preparation method of composite dephosphorizing agent for sewage disposal
CN108178270A (en) A kind of preparation method of binary compound type purifying agent
CN110467312B (en) Recycling treatment process for white carbon black production wastewater

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