CN105016452A - Sewage treating agent and method for treating sewage by using same - Google Patents
Sewage treating agent and method for treating sewage by using same Download PDFInfo
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- CN105016452A CN105016452A CN201510448130.6A CN201510448130A CN105016452A CN 105016452 A CN105016452 A CN 105016452A CN 201510448130 A CN201510448130 A CN 201510448130A CN 105016452 A CN105016452 A CN 105016452A
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Abstract
The invention discloses a sewage treating agent and a method for treating sewage by using the same. The sewage treating agent is prepared from the following raw materials: river sludge, tobermorite, plant wastes, concentrated sulfuric acid, sodium hydroxide, industrial aluminum sulfate and polysilicate ferrite. The sewage treating agent is wide in raw material source and low in cost; the method comprises the steps of compounding the river sludge, the plant wastes and acidized tobermorite under the microwave action to obtain a main raw material, and then, mixing the main raw material, sodium hydroxide, industrial aluminum sulfate and polysilicate ferrite in sequence to obtain the sewage treating agent. The preparation process is simple and low in cost. If the sewage treating agent is applied to treatment of sewage, the discharging quality of the treated sewage far exceeds the national first-grade standard; and the river sludge at the bottom of a comprehensive treatment tank can be used for preparing an organic fertilizer, biomass fuel and/or the sewage treating agent.
Description
Technical field
The present invention relates to sewage treatment area, specifically a kind of sewage-treating agent and apply its method of disposing of sewage.
Background technology
Environment protection directly affects the Sustainable development of Chinese national economy.In the Economic development of China's the past few decades, owing to ignoring developing environment protection, result in the situation that present stage environmental pollution is very serious.Though took a large amount of measure of control in recent years, environment became bad trend further and was still continuing.China is one of the most serious country of environmental pollution in the world, no matter is city, or rural area, and the air of China, river, lake, ocean and soil etc. are all subject to pollution in various degree.Five cities such as Kweiyang, Chongqing, Beijing, Lanzhou are positioned at the row in the most serious city of the large atmospheric pollution in the world ten, in more than 600 city, the whole nation, air quality meet national standard reference less than 10.The degree of nationwide acid rain harm and region also expanding day.
In the annual sewage discharge in the whole nation, only the sanitary sewage of 10% and the industrial sewage of 70% are processed, and wherein about have the water outlet of half Industrial Waste Water Treatments facility not reach discharging standards, all the other untreated sewages then directly enter in rivers and lakes, cause the water surrounding of China to be subject to severe contamination and destruction; The quantity discharged of town domestic sewage is just along with city-building and development and in the trend increased progressively.According to statistics, in 110 key sections of the whole nation seven large water systems and inland river, what belong to 4 classes and 5 class water bodys accounts for 39%; Urban ground water pollutions is generally serious, and in the trend worsened further, 136 flow through in the river in city, belong to 4 classes, 5 classes and more than 5 class standards up to 76.8%; The urban groundwater of about 50% is subject to pollution in various degree; Larger freshwater lake such as the Eutrophic Extents such as Dian Chi, Taihu Lake and Chaohu in the whole nation aggravate year by year; The drinking water source in some areas is subject to severe contamination, causes serious harm to people ' s health.Municipal wastes and industrial solid castoff grow with each passing day, and trade waste adds up accumulating amount more than 6,600,000,000 tons, take up an area more than 50,000 hectares, and more than 200 city is absorbed among rubbish encirclement.
With regard to sewage disposal investment cost and working cost, calculate by ton water cost 1500-2000 unit and working cost 0.8-1.4 yuan/ton, the municipal sewage plant that China not yet invests to build needs one-time investment 1,000 hundred million yuan, add municipal pipe network construction, invest more than 2,000 hundred million yuan, annual running cost 25000000000 yuan again.And the fund of China's construction of municipal effluent plant, 90% comes from various loan, annual 20000000000 yuan for Sewage Plant construction, each project is on average repaid 10 years phases, and after several years, principal and interest will more than 30,000,000,000 yuan, and running cost and principal and interest account for 1% of China GDP; And current municipal sewage treatment, only have social benefit, there is no economic benefit, therefore, investment huge like this and working cost, to the China of economics of underdevelopment, a white elephant beyond doubt.
And determine that the principal element of municipal sewage plant's investment and running cost is the selection of sewage treatment process and technology, that current China urban sewage treatment process generally adopts is traditional activated sludge process, oxidation ditch, SBR etc., these ripe and effective treatment process, are widely used in various places.But for a long period, hamper the construction of municipal sewage plant of China because energy consumption is large, working cost is high, some sewage works built up are also because of the reason that energy consumption is high, are in stopping production and half end-of-life state for a long time simultaneously.Within one quite long from now on period, energy consumption problem will become the bottleneck of municipal sewage treatment.The energy consumption problem of Sewage Plant can be solved, rationally carry out energy distribution, become the key factor determining sewage work's on-road efficiency quality, also be the deciding factor of following new sewage work's feasibility analysis, exploitation is applicable to efficient, the low consumption of China's national situation and can meets emission request, and capital construction and the low New Technology about Wastewater Treatment of working cost and novel process, will be the only way of following Designing Sewage Treatment Plant and operation, be of great practical significance.
Summary of the invention
The object of the present invention is to provide a kind of sewage-treating agent and apply its method of disposing of sewage, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme:
A kind of sewage-treating agent, according to the raw material of weight part is: river sludge 80-120 part, tobermorite 40-80 part, plant refuse 40-80 part, mass concentration be more than 90% vitriol oil 3-7 part, sodium hydroxide 10-20 part, industrial aluminum sulphate 20-30 part, ferric-polysilicate 15-25 part; Its preparation method, concrete steps are:
(1) add water in river sludge, make its water ratio be 60%-90%; The granular size of tobermorite is crushed to 30-100 order; The granular size of plant refuse is crushed to 100-300 order;
(2) tobermorite obtained in step (1) is mixed with the vitriol oil, pile up and obtain the first mix products after 12-24 hour;
(3) by the first mix products with obtain river sludge in step (1) and plant refuse mixes, then microwave heating while stirring, after microwave heating is to 100 DEG C-300 DEG C, then be incubated 1-4 hour, after cooling, obtain the second mix products; Wherein microwave heating frequency be 1200-3600MHz;
(4) be that 30-100 object sodium hydroxide mixes by the second mix products and granular size, dry at 80 DEG C-150 DEG C, after cooling, obtain the 3rd mix products of water ratio≤8%;
(5) by the 3rd mix products, industrial aluminum sulphate, and ferric-polysilicate mixing abrasive dust, namely obtain the sewage-treating agent that granular size is below 10 orders.
As the further scheme of the present invention: described sewage-treating agent, according to the raw material of weight part be: river sludge 90-110 part, tobermorite 50-70 part, plant refuse 50-70 part, mass concentration be more than 95% vitriol oil 4-6 part, sodium hydroxide 14-16 part, industrial aluminum sulphate 24-26 part, ferric-polysilicate 18-22 part.
As the further scheme of the present invention: described sewage-treating agent, according to the raw material of weight part be: river sludge 100 parts, tobermorite 60 parts, plant refuse 60 parts, mass concentration are the vitriol oil 5 parts, 15 parts, sodium hydroxide, industrial aluminum sulphate 25 parts, the ferric-polysilicate 20 parts of more than 95%.
As the further scheme of the present invention: step adds water in (1) in river sludge, its water ratio is made to be 70%-80%; The granular size of tobermorite is crushed to 50-70 order; The granular size of plant refuse is crushed to 180-220 order.
As the further scheme of the present invention: in step (3) after microwave heating is to 180 DEG C-220 DEG C, then be incubated 2-3 hour, obtain the second mix products after cooling; Wherein microwave heating frequency be 2400MHz.
As the further scheme of the present invention: be that 50-70 object sodium hydroxide mixes by the second mix products and granular size in step (4), dry at 100 DEG C-120 DEG C, after cooling, obtain the 3rd mix products of water ratio≤5%.
Apply a method for described treating sewage by sewage treating agent, concrete steps are:
(1) use sewage collecting pipe network by after sewage collecting, artificial screen cloth and mechanical grille are set at the tail end of its total sewage draining exit, remove out group's foreign material in sewage;
(2) sewage is incorporated in comprehensive treatment tank, according to sewage quality, first according to 0.5-5kg/m
3addition add described sewage-treating agent; Stirring or aeration make described sewage-treating agent fully mix with sewage;
(3) 0.5-4 hour is left standstill, when the colourity of comprehensive treatment tank top clear water reaches 5, comprehensive treatment tank top clear water is directly discharged or transfers in circulating water pool, by the river sludge bottom comprehensive treatment tank for the preparation of organic fertilizer, biomass fuel and/or described sewage-treating agent.
As the further scheme of the present invention: according to sewage quality in step (2), add pH adjusting agent, make pH value of sewage water reach 6-9.
Compared with prior art, the invention has the beneficial effects as follows:
Sewage-treating agent raw material sources provided by the invention are extensive, cost is low; It obtains main raw material by the compound under microwave action of the tobermorite after river sludge and plant refuse and acidifying, then is mixed successively with sodium hydroxide, industrial aluminum sulphate, ferric-polysilicate by main raw material, can obtain sewage-treating agent; Its preparation technology is simple, cost is low.Apply its Treating Municipal Sewage, the discharge quality superstate primary standard far away of municipal effluent after process; And the river sludge bottom comprehensive treatment tank can be used for preparing organic fertilizer, biomass fuel and/or described sewage-treating agent.
Embodiment
Be described in more detail below in conjunction with the technical scheme of embodiment to this patent.
Embodiment 1
A kind of sewage-treating agent, according to the raw material of weight part is: river sludge 80 parts, tobermorite 40 parts, plant refuse 40 parts, mass concentration are the vitriol oil 7 parts, 20 parts, sodium hydroxide, industrial aluminum sulphate 30 parts, the ferric-polysilicate 25 parts of 98%.
The preparation method of described sewage-treating agent, concrete steps are:
(1) add water in river sludge, make its water ratio be 60%; The granular size of tobermorite is crushed to 30 orders; The granular size of plant refuse is crushed to 300 orders;
(2) tobermorite obtained in step (1) is mixed with the vitriol oil, pile up and obtain the first mix products after 12 hours;
(3) by the first mix products with obtain river sludge in step (1) and plant refuse mixes, then microwave heating while stirring, after microwave heating is to 100 DEG C, then is incubated 1 hour, obtains the second mix products after cooling; Wherein microwave heating frequency be 1200MHz;
(4) be that 30 object sodium hydroxide mix by the second mix products and granular size, dry at 150 DEG C, after cooling, obtain the 3rd mix products of water ratio≤8%;
(5) by the 3rd mix products, industrial aluminum sulphate, and ferric-polysilicate mixing abrasive dust, namely obtain the sewage-treating agent that granular size is below 10 orders.
Embodiment 2
A kind of sewage-treating agent, according to the raw material of weight part is: river sludge 100 parts, tobermorite 60 parts, plant refuse 60 parts, mass concentration are the vitriol oil 5 parts, 15 parts, sodium hydroxide, industrial aluminum sulphate 25 parts, the ferric-polysilicate 20 parts of 95%.
The preparation method of described sewage-treating agent, concrete steps are:
(1) add water in river sludge, make its water ratio be 75%; The granular size of tobermorite is crushed to 65 orders; The granular size of plant refuse is crushed to 200 orders;
(2) tobermorite obtained in step (1) is mixed with the vitriol oil, pile up and obtain the first mix products after 18 hours;
(3) by the first mix products with obtain river sludge in step (1) and plant refuse mixes, then microwave heating while stirring, after microwave heating is to 200 DEG C, then is incubated 2.5 hours, obtains the second mix products after cooling; Wherein microwave heating frequency be 2400MHz;
(4) be that 65 object sodium hydroxide mix by the second mix products and granular size, dry at 120 DEG C, after cooling, obtain the 3rd mix products of water ratio≤5%;
(5) by the 3rd mix products, industrial aluminum sulphate, and ferric-polysilicate mixing abrasive dust, namely obtain the sewage-treating agent that granular size is below 8 orders.
Embodiment 3
A kind of sewage-treating agent, according to the raw material of weight part is: river sludge 120 parts, tobermorite 80 parts, plant refuse 80 parts, mass concentration are the vitriol oil 3 parts, 10 parts, sodium hydroxide, industrial aluminum sulphate 20 parts, the ferric-polysilicate 15 parts of 90%.
The preparation method of described sewage-treating agent, concrete steps are:
(1) add water in river sludge, make its water ratio be 90%; The granular size of tobermorite is crushed to 100 orders; The granular size of plant refuse is crushed to 100 orders;
(2) tobermorite obtained in step (1) is mixed with the vitriol oil, pile up and obtain the first mix products after 12 hours;
(3) by the first mix products with obtain river sludge in step (1) and plant refuse mixes, then microwave heating while stirring, after microwave heating is to 300 DEG C, then is incubated 4 hours, obtains the second mix products after cooling; Wherein microwave heating frequency be 3600MHz;
(4) be that 100 object sodium hydroxide mix by the second mix products and granular size, dry at 80 DEG C, after cooling, obtain the 3rd mix products of water ratio≤8%;
(5) by the 3rd mix products, industrial aluminum sulphate, and ferric-polysilicate mixing abrasive dust, namely obtain the sewage-treating agent that granular size is below 5 orders.
Embodiment 4
A kind of sewage-treating agent, according to the raw material of weight part is: river sludge 80 parts, tobermorite 80 parts, plant refuse 40 parts, mass concentration are the vitriol oil 3 parts, 20 parts, sodium hydroxide, industrial aluminum sulphate 20 parts, the ferric-polysilicate 25 parts of 98%.
The preparation method of described sewage-treating agent, concrete steps are:
(1) add water in river sludge, make its water ratio be 60%; The granular size of tobermorite is crushed to 100 orders; The granular size of plant refuse is crushed to 100 orders;
(2) tobermorite obtained in step (1) is mixed with the vitriol oil, pile up and obtain the first mix products after 24 hours;
(3) by the first mix products with obtain river sludge in step (1) and plant refuse mixes, then microwave heating while stirring, after microwave heating is to 100 DEG C, then is incubated 4 hours, obtains the second mix products after cooling; Wherein microwave heating frequency be 1200MHz;
(4) be that 100 object sodium hydroxide mix by the second mix products and granular size, dry at 80 DEG C, after cooling, obtain the 3rd mix products of water ratio≤5%;
(5) by the 3rd mix products, industrial aluminum sulphate, and ferric-polysilicate mixing abrasive dust, namely obtain the sewage-treating agent that granular size is below 5 orders.
Embodiment 5
A kind of sewage-treating agent, according to the raw material of weight part is: river sludge 120 parts, tobermorite 40 parts, plant refuse 80 parts, mass concentration are the vitriol oil 7 parts, 10 parts, sodium hydroxide, industrial aluminum sulphate 30 parts, the ferric-polysilicate 15 parts of 90%.
The preparation method of described sewage-treating agent, concrete steps are:
(1) add water in river sludge, make its water ratio be 90%; The granular size of tobermorite is crushed to 30 orders; The granular size of plant refuse is crushed to 300 orders;
(2) tobermorite obtained in step (1) is mixed with the vitriol oil, pile up and obtain the first mix products after 12 hours;
(3) by the first mix products with obtain river sludge in step (1) and plant refuse mixes, then microwave heating while stirring, after microwave heating is to 300 DEG C, then is incubated 1 hour, obtains the second mix products after cooling; Wherein microwave heating frequency be 3600MHz;
(4) be that 30 object sodium hydroxide mix by the second mix products and granular size, dry at 150 DEG C, after cooling, obtain the 3rd mix products of water ratio≤5%;
(5) by the 3rd mix products, industrial aluminum sulphate, and ferric-polysilicate mixing abrasive dust, namely obtain the sewage-treating agent that granular size is below 10 orders.
Comparative example 1
A kind of sewage-treating agent, according to the raw material of weight part is: tobermorite 60 parts, plant refuse 60 parts, mass concentration are the vitriol oil 5 parts, 15 parts, sodium hydroxide, industrial aluminum sulphate 25 parts, the ferric-polysilicate 20 parts of 95%.
The preparation method of described sewage-treating agent, concrete steps are:
(1) granular size of tobermorite is crushed to 65 orders; The granular size of plant refuse is crushed to 200 orders;
(2) tobermorite obtained in step (1) is mixed with the vitriol oil, pile up and obtain the first mix products after 18 hours;
(3) by the first mix products with obtain plant refuse in step (1) and mix, add water, make its water ratio be 20%-30%; Then the charring furnace putting into 600-900 DEG C processes 2.5 hours, obtains the second mix products after cooling;
(4) be 65 object sodium hydroxide, industrial aluminum sulphate by the second mix products and granular size, and ferric-polysilicate mixing abrasive dust, namely obtain the sewage-treating agent that granular size is below 8 orders.
Comparative example 2
A kind of sewage-treating agent, according to the raw material of weight part is: river sludge 100 parts, plant refuse 60 parts, mass concentration are the vitriol oil 5 parts, 15 parts, sodium hydroxide, industrial aluminum sulphate 25 parts, the ferric-polysilicate 20 parts of 95%.
The preparation method of described sewage-treating agent, concrete steps are:
(1) add water in river sludge, make its water ratio be 75%; The granular size of plant refuse is crushed to 200 orders;
(2) obtain river sludge and plant refuse by step (1), mix with the vitriol oil; Then microwave heating while stirring, after microwave heating is to 200 DEG C, then is incubated 2.5 hours, obtains the first mix products after cooling; Wherein microwave heating frequency be 2400MHz;
(3) be 65 object sodium hydroxide, industrial aluminum sulphate by the first mix products and granular size, and ferric-polysilicate mixing abrasive dust, namely obtain the sewage-treating agent that granular size is below 8 orders.
Comparative example 3
A kind of sewage-treating agent, according to the raw material of weight part is: river sludge 100 parts, tobermorite 60 parts, mass concentration are the vitriol oil 5 parts, 15 parts, sodium hydroxide, industrial aluminum sulphate 25 parts, the ferric-polysilicate 20 parts of 95%.
The preparation method of described sewage-treating agent, concrete steps are:
(1) add water in river sludge, make its water ratio be 75%; The granular size of tobermorite is crushed to 65 orders;
(2) tobermorite obtained in step (1) is mixed with the vitriol oil, pile up and obtain the first mix products after 18 hours;
(3) by the first mix products with obtain river sludge in step (1) and mix, then put into the charring furnace process 2.5 hours of 600-900 DEG C, after cooling, obtain the second mix products;
(4) be 65 object sodium hydroxide, industrial aluminum sulphate by the second mix products and granular size, and ferric-polysilicate mixing abrasive dust, namely obtain the sewage-treating agent that granular size is below 8 orders.
Application examples 1
The sewage-treating agent of above-described embodiment 1-5 and comparative example 1-3 is adopted to process certain city one place sanitary sewage, first according to 2kg/m respectively
3addition add described sewage-treating agent; Stirring or aeration make described sewage-treating agent fully mix with sewage; Leave standstill after 1 hour, sampling detects, and result is as following table 1.
Table 1 application examples 1 cartogram
As can be known from the above table, the sewage-treating agent of above-described embodiment 1-5 is adopted to carry out Treating Municipal Sewage, its effluent quality all can reach national grade one discharge standard, if any one saving in river sludge, tobermorite and plant refuse, its effect all can reduce greatly, even part index number does not reach national grade one discharge standard, visible river sludge, has synergistic function between tobermorite and plant refuse.
Application examples 2
The sewage-treating agent of above-described embodiment 2 and comparative example 2 is adopted to process the industrial sewage of certain city one place heavy metals exceeding standard, first according to 2kg/m respectively
3addition add described sewage-treating agent; Stirring or aeration make described sewage-treating agent fully mix with sewage; Leave standstill after 1 hour, sampling detects, and result is as following table 2.
Table 2 application examples 2 cartogram
(unit: mg/kg)
| Composition | Cu | Pb | Zn | Ni | Hg | Cd | Gr | As |
| Before process | 914.56 | 469.85 | 2515.17 | 251.27 | 4.86 | 18.43 | 485.27 | 58.62 |
| Embodiment 2 | 31.61 | 10.76 | 150.98 | 12.68 | 1.10 | 1.16 | 14.56 | 10.54 |
| Comparative example 2 | 154.23 | 165.46 | 896.49 | 54.19 | 2.67 | 5.43 | 188.45 | 29.13 |
| National standard | 800 | 300 | 2000 | 100 | 5 | 5 | 600 | 75 |
As can be known from the above table, the sewage-treating agent of above-described embodiment 2 can various heavy effectively in the municipal effluent that exceeds standard of removal heavy metal, Be very effective, and is obviously better than comparative example 2.
Above the better embodiment of this patent is explained in detail, but this patent is not limited to above-mentioned embodiment, in the ken that one skilled in the relevant art possesses, can also makes a variety of changes under the prerequisite not departing from this patent aim.
Claims (8)
1. a sewage-treating agent, it is characterized in that, according to the raw material of weight part be: river sludge 80-120 part, tobermorite 40-80 part, plant refuse 40-80 part, mass concentration be more than 90% vitriol oil 3-7 part, sodium hydroxide 10-20 part, industrial aluminum sulphate 20-30 part, ferric-polysilicate 15-25 part; Its preparation method, concrete steps are:
(1) add water in river sludge, make its water ratio be 60%-90%; The granular size of tobermorite is crushed to 30-100 order; The granular size of plant refuse is crushed to 100-300 order;
(2) tobermorite obtained in step (1) is mixed with the vitriol oil, pile up and obtain the first mix products after 12-24 hour;
(3) by the first mix products with obtain river sludge in step (1) and plant refuse mixes, then microwave heating while stirring, after microwave heating is to 100 DEG C-300 DEG C, then be incubated 1-4 hour, after cooling, obtain the second mix products; Wherein microwave heating frequency be 1200-3600MHz;
(4) be that 30-100 object sodium hydroxide mixes by the second mix products and granular size, dry at 80 DEG C-150 DEG C, after cooling, obtain the 3rd mix products of water ratio≤8%;
(5) by the 3rd mix products, industrial aluminum sulphate, and ferric-polysilicate mixing abrasive dust, namely obtain the sewage-treating agent that granular size is below 10 orders.
2. sewage-treating agent according to claim 1, it is characterized in that, described sewage-treating agent, according to the raw material of weight part is: river sludge 90-110 part, tobermorite 50-70 part, plant refuse 50-70 part, mass concentration be more than 95% vitriol oil 4-6 part, sodium hydroxide 14-16 part, industrial aluminum sulphate 24-26 part, ferric-polysilicate 18-22 part.
3. sewage-treating agent according to claim 1, it is characterized in that, described sewage-treating agent, according to the raw material of weight part is: river sludge 100 parts, tobermorite 60 parts, plant refuse 60 parts, mass concentration are the vitriol oil 5 parts, 15 parts, sodium hydroxide, industrial aluminum sulphate 25 parts, the ferric-polysilicate 20 parts of more than 95%.
4. according to the sewage-treating agent one of claim 1-3 Suo Shu, it is characterized in that, step adds water in (1) in river sludge, makes its water ratio be 70%-80%; The granular size of tobermorite is crushed to 50-70 order; The granular size of plant refuse is crushed to 180-220 order.
5. according to the sewage-treating agent one of claim 1-3 Suo Shu, it is characterized in that, in step (3) after microwave heating is to 180 DEG C-220 DEG C, then be incubated 2-3 hour, after cooling, obtain the second mix products; Wherein microwave heating frequency be 2400MHz.
6. according to the sewage-treating agent one of claim 1-3 Suo Shu, it is characterized in that, be that 50-70 object sodium hydroxide mixes by the second mix products and granular size in step (4), dry at 100 DEG C-120 DEG C, after cooling, obtain the 3rd mix products of water ratio≤5%.
7. application as arbitrary in claim 1-6 as described in the method for the treatment of sewage by sewage treating agent, it is characterized in that, concrete steps are:
(1) use sewage collecting pipe network by after sewage collecting, artificial screen cloth and mechanical grille are set at the tail end of its total sewage draining exit, remove out group's foreign material in sewage;
(2) sewage is incorporated in comprehensive treatment tank, according to sewage quality, first according to 0.5-5kg/m
3addition add described sewage-treating agent; Stirring or aeration make described sewage-treating agent fully mix with sewage;
(3) 0.5-4 hour is left standstill, when the colourity of comprehensive treatment tank top clear water reaches 5, comprehensive treatment tank top clear water is directly discharged or transfers in circulating water pool, by the river sludge bottom comprehensive treatment tank for the preparation of organic fertilizer, biomass fuel and/or described sewage-treating agent.
8. method of disposing of sewage according to claim 7, is characterized in that, according to sewage quality in step (2), adds pH adjusting agent, makes pH value of sewage water reach 6-9.
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| CN107892339A (en) * | 2017-11-23 | 2018-04-10 | 浙江海洋大学 | A kind of aquatic products sewage-treating agent prepares and its application |
| CN107973487A (en) * | 2017-11-14 | 2018-05-01 | 东华大学 | A kind of dyeing and finishing wastewater level treatment process and device |
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