JP2008279391A - Method for controlling scum production - Google Patents
Method for controlling scum production Download PDFInfo
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- JP2008279391A JP2008279391A JP2007126951A JP2007126951A JP2008279391A JP 2008279391 A JP2008279391 A JP 2008279391A JP 2007126951 A JP2007126951 A JP 2007126951A JP 2007126951 A JP2007126951 A JP 2007126951A JP 2008279391 A JP2008279391 A JP 2008279391A
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- sludge
- magnesium oxide
- oxide powder
- scum
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- 238000000034 method Methods 0.000 title claims description 13
- 239000000843 powder Substances 0.000 claims abstract description 52
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 37
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000002245 particle Substances 0.000 claims abstract description 20
- 239000003112 inhibitor Substances 0.000 claims description 24
- 238000005507 spraying Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 abstract description 10
- 239000010802 sludge Substances 0.000 description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 239000013049 sediment Substances 0.000 description 13
- 239000008187 granular material Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 9
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 8
- 239000000347 magnesium hydroxide Substances 0.000 description 8
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 239000004927 clay Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 210000003608 fece Anatomy 0.000 description 3
- 239000010871 livestock manure Substances 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 241000195628 Chlorophyta Species 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 241001148470 aerobic bacillus Species 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 235000014380 magnesium carbonate Nutrition 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 210000002700 urine Anatomy 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011361 granulated particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
Description
本発明は、河川のスカムの発生抑制方法に関する。 The present invention relates to a river scum generation suppression method.
下水道や下水処理施設の普及により、河川への屎尿の流入量は年々減少している。しかし、現在でも降雨時には雨水吐から、多量の屎尿が河川に流入することがある。河川に流入した屎尿は、河水の流速が緩やかな場所で沈降し、底部に堆積して極めて軟弱な汚泥を形成する。そして、汚泥中の硫酸塩還元菌やメタン生成菌などの嫌気性細菌の活動が、春から秋にかけて河川の水温の上昇と共に活発化すると、汚泥中から硫化水素ガスやメタンガスなどのガスが発生し、これらのガスと共に汚泥の一部がスカム（浮遊汚泥）として水面に浮上して、河川周辺地域への悪臭の原因となる。 Due to the widespread use of sewage and sewage treatment facilities, the inflow of urine into rivers is decreasing year by year. However, even today, a large amount of urine may flow into the river from rainwater discharge during rain. The manure flowing into the river settles at a place where the flow rate of the river water is slow and accumulates at the bottom to form extremely soft sludge. When the activity of anaerobic bacteria such as sulfate-reducing bacteria and methanogens in sludge is activated with the rise of river water temperature from spring to autumn, gases such as hydrogen sulfide gas and methane gas are generated from the sludge. Along with these gases, part of the sludge floats on the surface as scum (floating sludge), causing odors to the river surrounding area.
汚泥が堆積している河川の底質を改善する方法として、河川に酸化マグネシウム粉末や水酸化マグネシウム粉末などの苦土系粉粒体を主成分とする粒状物を散布して、河川の底質を弱アルカリ性に改質する方法が知られている。河川の底質を弱アルカリ性に改質すると、嫌気性細菌の活動が抑制され、好気性細菌の活動が活発になり、汚泥の分解が促進するという効果がある。 As a method to improve the bottom sediment of rivers where sludge is deposited, the river bottom sediment is sprayed on the rivers with granular materials mainly composed of powdered clay particles such as magnesium oxide powder and magnesium hydroxide powder. There is known a method of modifying the base to weakly alkaline. If the bottom sediment of the river is modified to be weakly alkaline, the activity of anaerobic bacteria is suppressed, the activity of aerobic bacteria becomes active, and the sludge decomposition is promoted.
特許文献１には、河川などの閉鎖性水域用の底質改善剤として、粒子径が５〜１００μｍで、比重が２．２ｇ／ｃｍ3以下の苦土系粉粒体から形成された水中にて投入後自己崩壊する粒状物からなる底質改善剤が開示されている。この特許文献１によれば、上記の底質改善剤は、水中に投入後自己崩壊し、分散して、溶解することによって、河川などの閉鎖性水域の底質を弱アルカリ性に維持するとされている。 In Patent Document 1, as a bottom sediment improving agent for closed water areas such as rivers, it is used in water formed from a bituminous powder having a particle size of 5 to 100 μm and a specific gravity of 2.2 g / cm 3 or less. A bottom material improving agent comprising a granular material that self-disintegrates after being introduced is disclosed. According to this Patent Document 1, the above-mentioned bottom sediment improving agent is said to maintain the bottom sediment of closed water areas such as rivers in weak alkalinity by self-disintegrating after being put into water, dispersing and dissolving. Yes.
特許文献２には、同じく河川などの閉鎖性水域用の底質改善剤として、１０００℃以上の温度で加熱し、焼結させた合成焼結マグネシアクリンカーからなる難崩壊性の底質改善剤が開示されている。この特許文献２では、底質改善剤は、１ｍｍ以上の大きさであることが好ましいとされており、その理由として、粒子径が大きい方が沈みやすく、また底質がヘドロ状の場合にはヘドロ内部に埋没しやすいため底質の改善効果が向上する旨の記載がある。
上記特許文献１や特許文献２に開示されている苦土系粉粒体の粒状物は、河川などの閉鎖性水域の底質を弱アルカリ性に改質するための改善剤として有用である。
しかしながら、本発明者の検討によると、苦土系粉粒体の粒状物からなる従来の底質改善剤を河川に散布しても、スカムの発生を抑制することは難しいことが判明した。これは、スカムが発生するような軟弱な汚泥が堆積している河川では、苦土系粉粒体の粒状物の大部分が汚泥の下部にまで速やかに沈降して、汚泥の下部は弱アルカリ性に改質されるが、汚泥の上部は弱アルカリ性に改質されずに嫌気性細菌の活動が継続するためであると考えられる。
従って、本発明の目的は、屎尿が軟弱な汚泥として堆積しているような河川において、スカムの発生を抑制する技術を提供することにある。
The granular material of the bitter earth system granular material currently disclosed by the said patent document 1 and the patent document 2 is useful as an improving agent for improving the bottom sediment of closed water areas, such as a river, to weak alkalinity.
However, according to the study of the present inventor, it has been found that it is difficult to suppress the occurrence of scum even if a conventional bottom sediment improving agent made of a granulate of a clay powder is dispersed on a river. This is because, in rivers where soft sludge that generates scum is accumulated, most of the granulated particles of the clay are quickly settled down to the bottom of the sludge, and the bottom of the sludge is weakly alkaline. However, it is thought that the upper part of the sludge is not modified to weak alkalinity and the activity of anaerobic bacteria continues.
Accordingly, an object of the present invention is to provide a technique for suppressing the occurrence of scum in rivers where manure is accumulated as soft sludge.
本発明は、粒子径が０．７５ｍｍ以下の、分散状態にある硬焼酸化マグネシウム粉末を含むスカム発生抑制剤にある。ここで、粒子径が０．７５ｍｍ以下であるとは、硬焼酸化マグネシウム粉末が目開き０．７５ｍｍの篩を全通することをいう。 The present invention resides in a scum generation inhibitor containing hard-burned magnesium oxide powder in a dispersed state having a particle size of 0.75 mm or less. Here, the particle diameter being 0.75 mm or less means that the hard-burned magnesium oxide powder passes through a sieve having an aperture of 0.75 mm.
本発明のスカム発生抑制剤の好ましい態様は、次の通りである。
（１）硬焼酸化マグネシウム粉末の平均粒子径が、０．０３〜０．５ｍｍの範囲にある。
（２）硬焼酸化マグネシウム粉末の嵩密度が、３．１ｇ／ｃｍ3以上である。
Preferred embodiments of the scum generation inhibitor of the present invention are as follows.
(1) The average particle diameter of the hard-burned magnesium oxide powder is in the range of 0.03 to 0.5 mm.
(2) The bulk density of the hard-baked magnesium oxide powder is 3.1 g / cm 3 or more.
本発明はさらに、上記本発明のスカム発生抑制剤を、河川表面１ｍ2あたり０．１〜１０ｋｇの範囲の量にて散布することからなる河川のスカム発生抑制方法にもある。 The present invention is also a river scum generation suppression method comprising spraying the scum generation inhibitor of the present invention in an amount of 0.1 to 10 kg per 1 m 2 of the river surface.
本発明のスカム発生抑制剤を、屎尿が軟弱な汚泥として堆積している河川に散布することによって、スカムの発生を抑制することが可能となる。 By spraying the scum generation inhibitor of the present invention on a river in which manure is accumulated as soft sludge, the generation of scum can be suppressed.
本発明のスカム発生抑制剤は、硬焼酸化マグネシウム粉末からなる。硬焼酸化マグネシウム粉末は、マグネサイト粉末又は水酸化マグネシウム粉末などのマグネシウム源粉末を１６００℃以上の温度で焼成することにより生成する酸化マグネシウム粉末である。この硬焼酸化マグネシウム粉末は、軽焼酸化マグネシウム粉末（焼成温度：８００〜９００℃）と比較して、反応性が低く、嵩密度が大きいという特性がある。本発明にて使用する硬焼酸化マグネシウム粉末は、嵩密度が通常は３．１ｇ／ｃｍ3以上であり、好ましくは３．２〜３．６ｇ／ｃｍ3の範囲にある。 The scum generation inhibitor of the present invention comprises a hard-burned magnesium oxide powder. The hard-fired magnesium oxide powder is a magnesium oxide powder produced by firing a magnesium source powder such as magnesite powder or magnesium hydroxide powder at a temperature of 1600 ° C. or higher. This hard-burned magnesium oxide powder has characteristics of low reactivity and high bulk density as compared with light-burned magnesium oxide powder (baking temperature: 800 to 900 ° C.). Hard sintered magnesium oxide powder used in the present invention, bulk density is usually at 3.1 g / cm 3 or more, preferably in the range of 3.2~3.6g / cm 3.
本発明にて使用する硬焼酸化マグネシウム粉末は、粒子径が０．７５ｍｍ以下の微粉末である。硬焼酸化マグネシウム粉末の平均粒子径は、０．０３〜０．５ｍｍの範囲にあることが好ましい。本発明では、この硬焼酸化マグネシウム粉末を分散状態、すなわち粒状物を成形していない粉末の状態で使用する。但し、本発明のスカム発生抑制剤は、３０質量％以内であれば、粒子径が０．７５ｍｍより大きい粒子が含まれていてもよい。 The hard-burned magnesium oxide powder used in the present invention is a fine powder having a particle size of 0.75 mm or less. The average particle size of the hard-burned magnesium oxide powder is preferably in the range of 0.03 to 0.5 mm. In the present invention, the hard-burned magnesium oxide powder is used in a dispersed state, that is, in a powder state in which no granular material is formed. However, the scum generation inhibitor of the present invention may contain particles having a particle diameter larger than 0.75 mm as long as it is within 30% by mass.
本発明にて使用する硬焼酸化マグネシウム粉末は、純度が９５質量％以上であることが好ましく、９６〜９９質量％の範囲にあることが特に好ましい。 The hard-burned magnesium oxide powder used in the present invention preferably has a purity of 95% by mass or more, particularly preferably in the range of 96 to 99% by mass.
本発明においてスカム発生抑制剤として使用する硬焼酸化マグネシウム粉末は、マグネサイト粉末又は水酸化マグネシウム粉末などのマグネシウム源粉末を１６００℃以上の温度、好ましくは１７００〜２１００℃の温度で焼成することによって生成する硬焼酸化マグネシウム粉末を篩などの公知の分級装置を用いて分級することによって製造することができる。マグネシウム源粉末としては、海水に石灰乳などのアルカリを投入して調製した水酸化マグネシウムスラリーを洗浄、ろ過、乾燥する方法（海水法）によって得られる水酸化マグネシウム粉末を用いることが好ましい。マグネシウム源粉末を焼成して硬焼酸化マグネシウム粉末とするに際しては、生成する硬焼酸化マグネシウム粉末が過度に粗大な焼結体を形成しないように、予めマグネシウム源粉末を１〜２０ｍｍの粒状物に成形して焼成することが好ましい。 The hard-burned magnesium oxide powder used as a scum generation inhibitor in the present invention is obtained by firing a magnesium source powder such as magnesite powder or magnesium hydroxide powder at a temperature of 1600 ° C or higher, preferably 1700-2100 ° C. The hard-baked magnesium oxide powder to be produced can be produced by classification using a known classifier such as a sieve. As the magnesium source powder, it is preferable to use magnesium hydroxide powder obtained by a method (seawater method) of washing, filtering and drying a magnesium hydroxide slurry prepared by introducing alkali such as lime milk into seawater. When the magnesium source powder is calcined to obtain a hard-burned magnesium oxide powder, the magnesium source powder is preliminarily made into a granular material of 1 to 20 mm so that the hard-burned magnesium oxide powder to be formed does not form an excessively coarse sintered body. Preferably, it is molded and fired.
本発明においてスカム発生抑制剤として使用する硬焼酸化マグネシウム粉末は、水との反応性が低く、かつ粒子径が小さい。このため、本発明のスカム発生抑制剤は、河川に散布すると、凝集粒子を殆ど形成しないで、均一に分散した状態で河川底部の汚泥の表層部にまで沈降する。汚泥の表層部に到達したスカム発生抑制剤は、汚泥を少しずつ弱アルカリ性に改質しながら緩やかに汚泥の内部を沈降して、汚泥全体を弱アルカリ性に改質する。すなわち、汚泥全体が弱アルカリ性に改質されることによって、汚泥全体において嫌気性細菌の活動が抑制され、硫化水素ガスやメタンガスなどのガスの発生量が低減し、これによりスカムの発生が抑制されると考えられる。また、嫌気性細菌の活動が抑制されることによって、好気性細菌の活動が活発になって汚泥の分解が促進するなど、河川全体の浄化が進行する。 The hard-burned magnesium oxide powder used as a scum generation inhibitor in the present invention has low reactivity with water and a small particle size. For this reason, when the scum generation inhibitor of the present invention is sprayed on a river, it hardly settles down and settles down to the surface layer of sludge at the bottom of the river in a uniformly dispersed state. The scum generation inhibitor that has reached the surface layer of the sludge gradually settles inside the sludge while gradually modifying the sludge to weakly alkaline, and reforms the entire sludge to weakly alkaline. In other words, the entire sludge is modified to be weakly alkaline, so that the activity of anaerobic bacteria is suppressed in the entire sludge, and the generation amount of gas such as hydrogen sulfide gas and methane gas is reduced, thereby suppressing the generation of scum. It is thought. Moreover, by suppressing the activity of anaerobic bacteria, the activity of aerobic bacteria becomes active and the decomposition of sludge is promoted, and the purification of the entire river proceeds.
本発明のスカム発生抑制剤を河川に散布するに際しては、スカム発生抑制剤の散布量は河川表面１ｍ2あたりの量として、０．１〜１０ｋｇの範囲にあることが好ましく、１〜５ｋｇの範囲にあることが特に好ましい。 When spraying the scum generation inhibitor of the present invention to a river, the spray amount of the scum generation inhibitor is preferably in the range of 0.1 to 10 kg as the amount per 1 m 2 of the river surface, and in the range of 1 to 5 kg. It is particularly preferable that
スカム発生抑制剤の河川への散布方法としては、スカム発生抑制剤を粉末状態のまま投入する方法、及びスカム発生抑制剤を水に分散させてスラリー状態として投入する方法のいずれの方法をも採用することができる。 As a method of spraying the scum generation inhibitor to the river, either a method of introducing the scum generation inhibitor in a powder state or a method of dispersing the scum generation inhibitor in water and introducing it in a slurry state is adopted. can do.
本発明のスカム発生抑制剤を河川に散布するに際しては、苦土系粉粒体の粒状物などからなる公知の底質改善剤を併用してもよい。苦土系粉粒体の粒状物は、本発明のスカム発生抑制剤と比較して、汚泥中の沈降速度が速く、汚泥の下部を速やかに弱アルカリ性に改質するため、本発明のスカム発生抑制剤と併用することによって、汚泥全体を弱アルカリ性に改質するまでの時間を短縮化できるという利点がある。本発明のスカム発生抑制剤と共に使用する苦土系粉粒体の粒状物は、粒子径が１〜５０ｍｍの範囲にあることが好ましい。 When the scum generation inhibitor of the present invention is sprayed on a river, a known bottom quality improving agent made of a granulated material of a bituminous powder may be used in combination. Compared with the scum generation inhibitor of the present invention, the granulate of the clay powder is faster in the sludge, and the lower part of the sludge is promptly modified to weak alkalinity. By using together with the inhibitor, there is an advantage that the time until the entire sludge is modified to weak alkalinity can be shortened. It is preferable that the particle size of the granule-based granule used together with the scum generation inhibitor of the present invention is in the range of 1 to 50 mm.
［実施例１］
常法に従って、海水に石灰乳を投入して水酸化マグネシウムスラリーを調製し、得られたスラリーを洗浄、ろ過、乾燥して、酸化マグネシウム換算純度が９５．０質量％以上の水酸化マグネシウム粉末を得た。得られた水酸化マグネシウム粉末を、加圧成形して粒子径が５〜１０ｍｍの粒状物としたのち、ロータリキルンを用いて、１８００℃の温度で焼成して、酸化マグネシウムの粒状焼成物（クリンカー）を得た。得られた酸化マグネシウムクリンカーを目開き０．７５ｍｍの篩を用いて分級して、篩下として、下記表１の性状の分散状態の硬焼酸化マグネシウム粉末を得た。なお、下記表１の平均粒子径は、目開きが１．００ｍｍ、０．５０ｍｍ、０．３０ｍｍ、０．１５ｍｍ、０．０７５ｍｍ及び０．０４５ｍｍの篩を用いて、篩分け法により測定した粒度分布から作成した篩上積算分布曲線にて積算篩上が５０質量％を示す粒子径である。
[Example 1]
According to a conventional method, lime milk is introduced into seawater to prepare a magnesium hydroxide slurry, and the resulting slurry is washed, filtered, and dried to obtain a magnesium hydroxide powder having a magnesium oxide equivalent purity of 95.0% by mass or more. Obtained. The obtained magnesium hydroxide powder is pressed to form granules having a particle size of 5 to 10 mm, and then fired at a temperature of 1800 ° C. using a rotary kiln to produce a magnesium oxide granulated product (clinker). ) The obtained magnesium oxide clinker was classified using a sieve having an aperture of 0.75 mm, and as a sieve, hard-burned magnesium oxide powder having the properties shown in Table 1 below was obtained. In addition, the average particle diameter of the following Table 1 is a particle size measured by a sieving method using sieves having openings of 1.00 mm, 0.50 mm, 0.30 mm, 0.15 mm, 0.075 mm, and 0.045 mm. The particle size at which the integrated sieve shows 50% by mass in the integrated sieve distribution curve created from the distribution.
表１
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化学成分 質量％
ＭｇＯ ９７．７３
ＣａＯ ０．６７
ＳｉＯ2 ０．８６
Ｆｅ2Ｏ3 ０．１１
Ａｌ2Ｏ3 ０．１０
Ｂ2Ｏ3 ０．５３
────────────────────────────────────
平均粒子径 ０．０６ｍｍ
────────────────────────────────────
嵩密度 ３．２３ｇ／ｃｍ3
────────────────────────────────────
Table 1
────────────────────────────────────
Chemical composition
MgO 97.73
CaO 0.67
SiO 2 0.86
Fe 2 O 3 0.11
Al 2 O 3 0.10
B 2 O 3 0.53
────────────────────────────────────
Average particle size 0.06mm
────────────────────────────────────
Bulk density 3.23 g / cm 3
────────────────────────────────────
スカムの発生が見られる河川の底部から採取した汚泥を、容量４５０ｍＬの透明プラスチック製容器（高さ：１２８ｍｍ、直径７０ｍｍ）に、高さ４０ｍｍとなるように敷き詰めた。次いで、水を汚泥が舞い上がらないようにしながら、水深が７５ｍｍとなるように静かに注入した。 Sludge collected from the bottom of a river where scum is observed was spread in a transparent plastic container (height: 128 mm, diameter 70 mm) with a capacity of 450 mm so as to have a height of 40 mm. Next, water was gently poured so that the water depth was 75 mm while preventing sludge from flying up.
静置により汚泥が安定した後、上記の硬焼酸化マグネシウム粉末１０ｇを投入した。硬焼酸化マグネシウム粉末は水中に均一に分散しながら沈降した。汚泥の表面に到達した硬焼酸化マグネシウム粉末は、汚泥中に埋没し、汚泥表面には堆積しなかった。 After the sludge was stabilized by standing, 10 g of the above-mentioned hard-burned magnesium oxide powder was added. The hard-burned magnesium oxide powder settled while being uniformly dispersed in water. The hard-burned magnesium oxide powder that reached the surface of the sludge was buried in the sludge and did not accumulate on the sludge surface.
透明プラスチック製容器に蓋をして静置し、汚泥の経時変化を目視で観察した。図１に汚泥の経時変化を写真で示し、表２に目視観察の結果を示す。なお、実施例１は２００７年２月１７日に開始した。 The transparent plastic container was covered and allowed to stand, and the change with time of the sludge was visually observed. FIG. 1 shows a change in sludge with time, and Table 2 shows the results of visual observation. In addition, Example 1 was started on February 17, 2007.
［比較例１］
実施例１と同様にして、透明プラスチック製容器に汚泥と水とを入れた。その後、硬焼酸化マグネシウム粉末を加えることなく、透明プラスチック製容器に蓋をして静置し、汚泥の経時変化を目視で観察した。図１に汚泥の経時変化を写真で示し、表２に目視観察の結果を示す。なお、比較例１は、実施例１と同じく２００７年２月１７日に開始した。
[Comparative Example 1]
In the same manner as in Example 1, sludge and water were placed in a transparent plastic container. Then, without adding the hard-burned magnesium oxide powder, the transparent plastic container was covered and allowed to stand, and the change with time of the sludge was visually observed. FIG. 1 shows a change in sludge with time, and Table 2 shows the results of visual observation. Comparative Example 1 was started on February 17, 2007 as in Example 1.
表２
────────────────────────────────────────
実施例１ 比較例１
────────────────────────────────────────
１３日目 目立った変化は現れなかった。 汚泥の表面が部分的に隆起した。
（３月２日）
────────────────────────────────────────
１５日目 同上。 スカムが発生した。
（３月４日）
────────────────────────────────────────
１７日目 同上。 汚泥の表面の隆起部分が増加した。
（３月６日）
────────────────────────────────────────
１９日目 同上。 汚泥の表面の隆起部分がさらに増加し
（３月８日） た。
────────────────────────────────────────
２７日目 汚泥の表面に緑藻が発生した。 スカムが沈み始めた。
（３月１６日）
────────────────────────────────────────
２８日目 同上。 スカムが完全に沈降した。
（３月２７日）
────────────────────────────────────────
Table 2
────────────────────────────────────────
Example 1 Comparative Example 1
────────────────────────────────────────
Day 13 There was no noticeable change. The surface of the sludge was partially raised.
(March 2)
────────────────────────────────────────
Day 15 Same as above. Scum has occurred.
(March 4)
────────────────────────────────────────
Day 17 Same as above. The raised part of the sludge surface increased.
(March 6)
────────────────────────────────────────
Day 19 Same as above. The raised part of the sludge surface further increased (March 8).
────────────────────────────────────────
Day 27 Green algae was generated on the surface of the sludge. Scum began to sink.
(March 16)
────────────────────────────────────────
Day 28 Same as above. Scum settled down completely.
(March 27)
────────────────────────────────────────
図１及び表２に示した目視観察の結果から、硬焼酸化マグネシウム粉末を散布した汚泥（実施例１）では、試験開始から２８日を経過してもスカムの発生は見られず、硬焼酸化マグネシウム粉末がスカムの発生抑制剤として作用していることが分かる。また、硬焼酸化マグネシウム粉末を投入した汚泥では、汚泥の表面に緑藻が発生していることから、汚泥中の嫌気性細菌の活性も抑制されていると考えられる。 From the results of visual observation shown in FIG. 1 and Table 2, in the sludge sprayed with the hard-burned magnesium oxide powder (Example 1), no scum was observed even after 28 days from the start of the test. It can be seen that the magnesium oxide powder acts as a scum generation inhibitor. Further, in the sludge charged with the hard-burned magnesium oxide powder, green algae are generated on the surface of the sludge, so it is considered that the activity of anaerobic bacteria in the sludge is also suppressed.
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| JP2011144158A (en) * | 2009-08-26 | 2011-07-28 | Kankyo Magnecia Co Ltd | Aquatic plant germination inhibitor |
| TWI489945B (en) * | 2009-08-26 | 2015-07-01 | 宇部材料股份有限公司 | Explosive agents for aquatic plants |
| KR101661643B1 (en) * | 2009-08-26 | 2016-09-30 | 우베 마테리알즈 가부시키가이샤 | Agent for preventing germination of aquatic plants |
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