JP5828208B2 - Sludge dewatering method - Google Patents
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Description
本発明は、汚泥脱水方法に係り、特に有機性廃水の活性汚泥処理において発生する余剰汚泥と、リン酸カルシウムを含む汚泥との混合汚泥を脱水する方法に関する。 The present invention relates to a sludge dewatering method, and more particularly to a method for dewatering mixed sludge of excess sludge generated in activated sludge treatment of organic wastewater and sludge containing calcium phosphate.
下水等の有機性廃水を活性汚泥処理した場合に発生する余剰汚泥は、脱水性が悪いために、凝集剤で凝集処理した後、脱水機で脱水することが多い。例えば、特許文献１では、汚泥に塩化第二鉄と消石灰を添加し、フィルタプレスで脱水することが記載されている。特許文献１での添加率は、汚泥濃度１．５８％の余剰汚泥に対し塩化第二鉄１０％（重量％。以下、同様）、消石灰１０％（実施例２）、汚泥濃度２．５４％の余剰汚泥に対し塩化第二鉄１２％、消石灰４５％（実施例３）である。 Since excess sludge generated when organic wastewater such as sewage is treated with activated sludge is poor in dewaterability, it is often dehydrated with a dehydrator after coagulating with a coagulant. For example, Patent Document 1 describes that ferric chloride and slaked lime are added to sludge and dehydrated with a filter press. The addition rate in Patent Document 1 is 10% ferric chloride (weight%, hereinafter the same), 10% slaked lime (Example 2), and sludge concentration 2.54% with respect to surplus sludge having a sludge concentration 1.58%. It is 12% of ferric chloride and 45% of slaked lime with respect to the excess sludge (Example 3).
上記のように、従来、有機性廃水の活性汚泥処理において発生する汚泥を脱水機で脱水する際に添加する消石灰量は１０〜４５％と多い。このため、脱水汚泥ケーキの量が増大し、ケーキ処分費が嵩む問題があった。本発明は、少量の消石灰の添加で、脱水汚泥ケーキの量を増大させることなく、汚泥の脱水性を改善することができる汚泥脱水方法を提供することを目的とする。 As described above, conventionally, the amount of slaked lime added when dewatering sludge generated in the activated sludge treatment of organic wastewater with a dehydrator is as large as 10 to 45%. For this reason, there has been a problem that the amount of dehydrated sludge cake increases and cake disposal costs increase. An object of the present invention is to provide a sludge dewatering method that can improve the dewaterability of sludge without increasing the amount of dewatered sludge cake with the addition of a small amount of slaked lime.
請求項１の汚泥脱水方法は、有機性廃水の活性汚泥処理において発生する余剰汚泥と、リン酸カルシウムを含むリン酸カルシウム含有汚泥との混合汚泥を脱水機で脱水する汚泥脱水方法において、該混合汚泥に消石灰を１００〜２０００ｍｇ／L添加して脱水することを特徴とするものである。 The sludge dewatering method according to claim 1 is a sludge dewatering method in which a mixed sludge of excess sludge generated in activated sludge treatment of organic waste water and calcium phosphate-containing sludge containing calcium phosphate is dehydrated with a dehydrator, and slaked lime is added to the mixed sludge. It is characterized by adding 100 to 2000 mg / L and dehydrating.
請求項２の汚泥脱水方法は、請求項１において、消石灰を２００〜５００ｍｇ／Ｌ添加することを特徴とするものである。 The sludge dewatering method according to claim 2 is characterized in that 200 to 500 mg / L of slaked lime is added in claim 1.
請求項３の汚泥脱水方法は、請求項１又は２において、有機性廃水は液晶ディスプレイ製造工場での現像廃液、レジスト剥離廃水及び有機酸エッチング廃水の少なくとも１種であり、リン酸カルシウム含有汚泥は、該液晶ディスプレイ製造工場でのリン酸エッチング廃水を消石灰によりリン酸不溶化処理する工程で発生するリン酸カルシウム含有汚泥であることを特徴とするものである。 The sludge dewatering method according to claim 3 is the method according to claim 1 or 2, wherein the organic waste water is at least one of a developing waste liquid, a resist stripping waste water and an organic acid etching waste water in a liquid crystal display manufacturing factory, and the calcium phosphate-containing sludge is It is characterized by being calcium phosphate-containing sludge generated in a process of insolubilizing phosphoric acid etching wastewater at a liquid crystal display manufacturing factory with slaked lime.
請求項４の汚泥脱水方法は、請求項３において、前記余剰汚泥と、前記リン酸カルシウム含有汚泥と、リン酸エッチング廃液を消石灰によりリン酸の不溶化処理を行った際の処理水、有機性廃水の活性汚泥処理水および、前記の混合汚泥の脱水濾液を、アルミ系凝集剤で凝集処理する工程からの凝集汚泥との混合汚泥に対し前記消石灰を添加して脱水することを特徴とするものである。 The sludge dewatering method according to claim 4 is characterized in that, in claim 3, the surplus sludge, the calcium phosphate-containing sludge, and the activity of treated water and organic waste water when phosphoric acid etching waste liquid is insolubilized with phosphoric acid by slaked lime. The slaked lime is added to the sludge mixed water with the sludge treated water and the sludge mixed with the agglomerated sludge from the step of aggregating the mixed sludge with the aluminum-based flocculant, and dehydrated.
有機性廃水の活性汚泥処理において発生する余剰汚泥は、脱水性が悪いが、リン酸カルシウムを含む汚泥は脱水性が良い。従って、余剰汚泥と、リン酸カルシウムを含む汚泥とを混合することにより、汚泥の脱水性が向上する。本発明では、この余剰汚泥とリン酸カルシウム含有汚泥との混合汚泥に対し、消石灰を１００〜２０００ｍｇ／Ｌ添加する。このようにリン酸カルシウムによって脱水性がある程度向上している混合汚泥に対し消石灰を少量添加すると、混合汚泥の脱水性が顕著に向上することが見出された。本発明は、かかる知見に基くものである。 Excess sludge generated in the activated sludge treatment of organic wastewater has poor dewaterability, but sludge containing calcium phosphate has good dewaterability. Therefore, the dewaterability of sludge improves by mixing excess sludge and sludge containing calcium phosphate. In the present invention, 100 to 2000 mg / L of slaked lime is added to the mixed sludge of this excess sludge and calcium phosphate-containing sludge. Thus, it was found that when a small amount of slaked lime is added to the mixed sludge whose dewaterability is improved to some extent by calcium phosphate, the dewaterability of the mixed sludge is remarkably improved. The present invention is based on such knowledge.
以下、本発明についてさらに詳細に説明する。 Hereinafter, the present invention will be described in more detail.
本発明では、有機性廃水の活性汚泥処理で発生する余剰汚泥と、リン酸カルシウムを含む汚泥との混合汚泥に対し、消石灰を１００〜２０００ｍｇ／Ｌ添加して（即ち、混合汚泥に対して消石灰を、添加後の汚泥中における消石灰濃度が１００〜２０００ｍｇ／Ｌとなるように添加して）脱水する。従って、本発明は、有機性廃水の活性汚泥処理と、リン酸カルシウム含有汚泥とが発生する廃水処理プロセスに適用するのに好適である。このような廃水処理プロセスとしては、液晶ディスプレイ等の電子部品製造工程廃水の処理プロセスが挙げられる。 In the present invention, 100 to 2000 mg / L of slaked lime is added to the mixed sludge of surplus sludge generated in the activated sludge treatment of organic waste water and sludge containing calcium phosphate (that is, slaked lime is added to the mixed sludge, Add the slaked lime in the sludge after the addition so that it is 100 to 2000 mg / L) and dehydrate. Therefore, the present invention is suitable for application to a wastewater treatment process in which activated sludge treatment of organic wastewater and calcium phosphate-containing sludge are generated. Examples of such a wastewater treatment process include a wastewater treatment process for manufacturing electronic parts such as a liquid crystal display.
液晶ディスプレイ製造工場では、現像廃液、レジスト剥離廃液、有機酸エッチング廃液などの有機性廃液は、活性汚泥処理がなされており、余剰汚泥が発生する。また、リン酸エッチング廃液は、消石灰によりリン酸の不溶化処理がなされており、リン酸カルシウムを含む汚泥が発生する。 In liquid crystal display manufacturing factories, organic waste liquids such as development waste liquid, resist stripping waste liquid, and organic acid etching waste liquid are subjected to activated sludge treatment, and surplus sludge is generated. Further, the phosphoric acid etching waste liquid is insolubilized with phosphoric acid by slaked lime, and sludge containing calcium phosphate is generated.
余剰汚泥とリン酸カルシウム含有汚泥との混合割合は、混合汚泥固形分１００重量部に対しリン酸カルシウム含有汚泥を固形分として７０〜９５重量部、特に８０〜９２重量部、とりわけ８５〜９０重量部程度が好適である。なお、通常の液晶ディスプレイ製造工場廃水の活性汚泥処理で発生する余剰汚泥の濃度は０．６〜１．５重量％程度であり、リン酸エッチング廃水の消石灰による不溶化処理工程で発生するリン酸カルシウム含有汚泥の濃度は２０〜３０重量％程度である。両者の容量混合割合は、リン酸カルシウム汚泥が、通常１０〜４０容量％程度であり、混合汚泥の濃度は通常３〜１２重量％、特に５〜１０重量％程度である。 The mixing ratio between the excess sludge and the calcium phosphate-containing sludge is preferably 70 to 95 parts by weight, particularly 80 to 92 parts by weight, especially 85 to 90 parts by weight, with the calcium phosphate-containing sludge as the solids to 100 parts by weight of the mixed sludge solids. It is. In addition, the concentration of excess sludge generated in the activated sludge treatment of normal liquid crystal display manufacturing factory wastewater is about 0.6 to 1.5% by weight, and the calcium phosphate-containing sludge generated in the insolubilization treatment process with slaked lime of phosphoric acid etching wastewater The concentration of is about 20 to 30% by weight. The volume mixing ratio of the two is usually about 10 to 40% by volume for calcium phosphate sludge, and the concentration of the mixed sludge is usually about 3 to 12% by weight, particularly about 5 to 10% by weight.
本発明を液晶ディスプレイ製造工場廃水の処理に適用する場合、有機性の活性汚泥処理の余剰汚泥とリン酸カルシウム含有汚泥との２者を混合してもよいが、さらにＰＡＣ（ポリ塩化アルミニウム）、硫酸バンドなどのアルミ系凝集剤による凝集汚泥も加えた３者の混合汚泥に消石灰を添加して脱水処理してもよい。このアルミ系凝集剤による凝集汚泥は、リン酸エッチング廃液を消石灰によりリン酸の不溶化処理を行った際の処理水、有機性廃水の活性汚泥処理水および、前記の混合汚泥の脱水濾液を、アルミ系凝集剤で凝集処理した際に発生する汚泥のことである。 When the present invention is applied to the treatment of wastewater from a liquid crystal display manufacturing factory, the surplus sludge from organic activated sludge treatment and the calcium phosphate-containing sludge may be mixed, but PAC (polyaluminum chloride) and sulfuric acid band may be mixed. For example, slaked lime may be added to the mixed sludge of the three parties to which coagulated sludge with an aluminum-based coagulant is added and dehydrated. This agglomerated sludge using an aluminum flocculant is obtained by treating the phosphoric acid etching waste liquid treated with slaked lime with phosphoric acid insolubilized water, activated sludge treated water of organic waste water, and the above mixed sludge dehydrated filtrate. It is sludge generated when aggregating with a system flocculant.
かかる２者又は３者もしくはさらに他の汚泥を加えた混合汚泥に対し、消石灰を１００〜２０００ｍｇ／Ｌ添加する。この添加量は、混合汚泥の汚泥固形分量に対して約０．３〜２．６重量％程度であり、従来の一般的な消石灰添加量の１／１０以下である。なお、消石灰の好ましい添加量は１００〜１０００ｍｇ／Ｌ、特に２００〜６００ｍｇ／Ｌ、とりわけ２００〜５００ｍｇ／Ｌである。また、消石灰添加後のｐＨが１０〜１１となるような消石灰添加量とするのが好ましい。 100 to 2000 mg / L of slaked lime is added to the mixed sludge to which such two, three, or other sludge is added. This addition amount is about 0.3 to 2.6% by weight with respect to the sludge solid content of the mixed sludge, and is 1/10 or less of the conventional general slaked lime addition amount. In addition, the preferable addition amount of slaked lime is 100 to 1000 mg / L, particularly 200 to 600 mg / L, especially 200 to 500 mg / L. Moreover, it is preferable to set it as the amount of slaked lime addition that the pH after slaked lime addition will be 10-11.
消石灰は、粉末で添加されてもよく、スラリーとして添加されてもよい。消石灰の添加場所は、混合汚泥の貯槽であってもよく、汚泥を貯槽から脱水機まで送る配管の途中であってもよい。 Slaked lime may be added as a powder or may be added as a slurry. The place where slaked lime is added may be a mixed sludge storage tank, or may be in the middle of a pipe that sends the sludge from the storage tank to the dehydrator.
脱水機としては、フィルタープレス、ベルトプレス、遠心脱水機、電気浸透脱水、スクリュープレス、多重円板濾過などのいずれでもよい。 As a dehydrator, any of a filter press, a belt press, a centrifugal dehydrator, an electroosmotic dehydration, a screw press, a multiple disk filtration, etc. may be used.
消石灰の添加量は、消石灰添加後の混合汚泥の脱水性（例えば、脱水処理後のケーキ含水率や、汚泥の剥離性）に基づいて上記範囲内で調整されてもよい。 The amount of slaked lime added may be adjusted within the above range based on the dewaterability of the mixed sludge after the addition of slaked lime (for example, the moisture content of the cake after the dehydration treatment and the peelability of the sludge).
本発明によると、上記のように少量の消石灰の添加で汚泥の脱水性が顕著に向上するので、脱水汚泥ケーキ量の増加も極めて少ない。消石灰添加量が少なくても脱水性が向上する理由については、必ずしも十分に明らかではないが、混合汚泥中のリン酸カルシウムと消石灰とが何らかの形態で反応することに起因するのではないかと推察される。 According to the present invention, as described above, the addition of a small amount of slaked lime significantly improves the dewaterability of sludge, so that the amount of dewatered sludge cake is extremely small. The reason why the dewaterability is improved even if the amount of slaked lime added is small is not necessarily clear enough, but it is presumed that it is caused by the reaction of calcium phosphate and slaked lime in the mixed sludge in some form.
本発明は、前述の通り、液晶ディスプレイ製造工場廃水の処理に適用するのに好適である。 As described above, the present invention is suitable for application to liquid crystal display manufacturing factory wastewater treatment.
液晶製造工場では、リン酸カルシウム含有汚泥、アルミ系凝集剤による凝集汚泥及び有機性余剰汚泥を混合した混合汚泥をフィルタープレスで脱水しているが、その混合比率はその日の製造状態により毎日変化する。この有機系汚泥の比率が多くなった場合には汚泥脱水性が悪化することが多く、例えば、汚泥が濾布から剥離しにくくなったり含水率が高くなり、ひどい時には汚泥ケーキが得られず汚泥が液状のまま排出されることがあった。 In a liquid crystal manufacturing factory, mixed sludge mixed with calcium phosphate-containing sludge, agglomerated sludge using an aluminum-based flocculant, and organic surplus sludge is dehydrated with a filter press, and the mixing ratio changes daily depending on the production state of the day. When the ratio of organic sludge increases, sludge dewaterability often deteriorates.For example, sludge becomes difficult to peel off from the filter cloth or has a high moisture content. May be discharged in liquid form.
一般に、複数の処理系統の汚泥を1か所の貯留槽に貯留し混合汚泥としてフィルタープレス脱水する場合に、各処理系統の汚泥貯留量はその時の運転条件で変化し、その影響で汚泥性状も日によって変化する。脱水機による脱水性状もこの汚泥性状変化の影響を受け、ケーキ含水率の大幅な増加や濾布からの剥離性の悪化が生じる。 In general, when sludge from multiple treatment systems is stored in a single storage tank and dewatered by filter press as mixed sludge, the amount of sludge stored in each treatment system varies depending on the operating conditions at that time, and the sludge properties are also affected by that effect. Varies by day. The dewatering property by the dehydrator is also affected by the sludge property change, resulting in a significant increase in the moisture content of the cake and deterioration of the peelability from the filter cloth.
脱水性状が悪化した場合には、基本的には各処理系統からの排出汚泥量の調整などにより対応するが、処理系統での調整が困難な場合もある。 When the dewatering property deteriorates, it is basically handled by adjusting the amount of sludge discharged from each processing system, but it may be difficult to adjust the processing system.
本発明によれば、有機性の活性汚泥処理の余剰汚泥とリン酸カルシウム含有汚泥との混合汚泥の脱水性が著しく向上し、各汚泥の性状変化があっても脱水ケーキの含水率を十分に低下させることができる。 According to the present invention, the dewaterability of the mixed sludge of the surplus sludge from the organic activated sludge treatment and the calcium phosphate-containing sludge is remarkably improved, and the water content of the dewatered cake is sufficiently reduced even if the properties of each sludge are changed. be able to.
ただし、本発明は、液晶ディスプレイ製造工場廃水以外の廃水処理から発生する汚泥の脱水処理にも適用することができる。 However, the present invention can also be applied to dewatering treatment of sludge generated from wastewater treatment other than liquid crystal display manufacturing plant wastewater.
以下、実施例及び比較例について説明する。 Hereinafter, examples and comparative examples will be described.
［実施例１〜３、比較例１］
液晶ディスプレイ製造工場の現像廃水、レジスト剥離廃水及び有機酸エッチング廃水の混合廃水の活性汚泥処理の余剰汚泥と、この液晶ディスプレイ製造工場のリン酸エッチング廃水の消石灰によるリン酸不溶化処理工程からのリン酸カルシウム含有汚泥と、アルミ系凝集剤による凝集処理汚泥とを混合した混合汚泥に粉末状消石灰を添加したときの脱水性改善効果について、小型脱水機を用いて判定した。このアルミ系凝集剤による凝集処理汚泥（以下、アルミ系凝集汚泥ということがある。）は、リン酸エッチング廃液を消石灰によりリン酸の不溶化処理を行った際の処理水、有機性廃水の活性汚泥処理水および、前記の混合汚泥の脱水濾液を、ＰＡＣ（ポリ塩化アルミニウム）で凝集処理した際に発生する汚泥のことである。
[Examples 1 to 3, Comparative Example 1]
Contains excess sludge from activated sludge treatment of mixed wastewater from development wastewater, resist stripping wastewater, and organic acid etching wastewater at the liquid crystal display manufacturing plant, and calcium phosphate from the phosphoric acid etching wastewater treatment process of phosphoric acid etching wastewater from this liquid crystal display manufacturing plant The effect of improving the dewaterability when powdered slaked lime was added to mixed sludge mixed with sludge and agglomeration-treated sludge with an aluminum flocculant was determined using a small dehydrator. This sludge treated with aluminum flocculant (hereinafter sometimes referred to as aluminum flocculent sludge) is treated sludge when phosphoric acid etching waste liquid is insolubilized with phosphoric acid using slaked lime, activated sludge of organic waste water. It is sludge generated when the treated water and the dehydrated filtrate of the mixed sludge are coagulated with PAC (polyaluminum chloride).
なお、上記余剰汚泥は、ＳＳ濃度０．９重量％、ＶＳＳ／ＳＳ約０．９０である。リン酸カルシウム含有汚泥は、ＳＳ濃度２２重量％、ＶＳＳ／ＳＳ約０．０５、Ｐ２Ｏ５／ＳＳ約０．３８、ＣａＯ／ＳＳ約０．５２である。アルミ系凝集剤による凝集汚泥は、ＳＳ濃度３重量％、ＶＳＳ／ＳＳ約０．３５であり、Ａｌ／ＳＳは約０．１である。 The surplus sludge has an SS concentration of 0.9% by weight and a VSS / SS of about 0.90. The calcium phosphate-containing sludge has an SS concentration of 22% by weight, VSS / SS of about 0.05, P 2 O 5 / SS of about 0.38, and CaO / SS of about 0.52. Aggregated sludge with an aluminum-based coagulant has an SS concentration of 3% by weight, VSS / SS of about 0.35, and Al / SS of about 0.1.
小型脱水機の仕様及び運転条件は次の通りである。 The specifications and operating conditions of the small dehydrator are as follows.
濾過面積：１００ｃｍ２（片面式）
濾過厚み：１５ｍｍ
濾室容積：１５０ｃｍ３
使用濾布：ナイロン系濾布、モノフィラメント織り
濾過圧力：０．４ＭＰａ
濾過時間：４０分
圧搾圧力：０．３ＭＰａ
圧搾時間：４０分
Filtration area: 100 cm 2 (single-sided)
Filtration thickness: 15mm
Filtration chamber volume: 150 cm 3
Filter cloth used: Nylon filter cloth, monofilament weave Filtration pressure: 0.4 MPa
Filtration time: 40 minutes Pressing pressure: 0.3 MPa
Squeeze time: 40 minutes
余剰汚泥と、リン酸カルシウム含有汚泥（以下、リン酸カルシウム汚泥と記載することがある。）と、アルミ系凝集汚泥とを表１の割合で混合し、消石灰添加量を０ｍｇ／Ｌ、２５０ｍｇ／Ｌ、５００ｍｇ／Ｌ、１０００ｍｇ／Ｌ又は２０００ｍｇ／Ｌとし、上記小型脱水機で脱水したときの脱水ケーキの含水率及び平均濾過速度を測定した。 Excess sludge, calcium phosphate-containing sludge (hereinafter sometimes referred to as calcium phosphate sludge), and aluminum-based agglomerated sludge are mixed in the proportions shown in Table 1, and the slaked lime addition amount is 0 mg / L, 250 mg / L, 500 mg / L, 1000 mg / L, or 2000 mg / L, and the water content and average filtration rate of the dehydrated cake when dehydrated by the small dehydrator were measured.
結果を図１，２に示す。なお、図１のデータのうち消石灰添加率（０ｍｇ／Ｌ、２５０ｍｇ／Ｌ又は５００ｍｇ／Ｌ）をパラメータとしてプロットしたグラフを図３に示す。また、消石灰添加後の混合汚泥のｐＨを表２に示す。 The results are shown in FIGS. In addition, the graph which plotted the slaked lime addition rate (0 mg / L, 250 mg / L, or 500 mg / L) among the data of FIG. 1 as a parameter is shown in FIG. Table 2 shows the pH of the mixed sludge after the addition of slaked lime.
図１，２に示す通り、消石灰を１００〜２０００ｍｇ／Ｌ、特に２００〜１０００ｍｇ／Ｌ、とりわけ２００〜５００ｍｇ／Ｌ程度添加することにより、脱水ケーキの含水率が十分に低くなり、濾過速度も高くなる。また、図３の通り、リン酸カルシウム汚泥の比率が多くなるほど、脱水ケーキの含水率が低くなる。 As shown in FIGS. 1 and 2, by adding about 100 to 2000 mg / L of slaked lime, particularly about 200 to 1000 mg / L, especially about 200 to 500 mg / L, the moisture content of the dehydrated cake becomes sufficiently low, and the filtration rate is also high. Become. Moreover, as FIG. 3 shows, the moisture content of the dehydrated cake decreases as the ratio of calcium phosphate sludge increases.
＜消石灰をＮａＯＨに代替した場合の混合汚泥の脱水性テスト＞
上記余剰汚泥３０重量％、リン酸カルシウム汚泥３４重量％及びアルミ系凝集汚泥３６重量％を混合した混合汚泥に消石灰又はＮａＯＨを添加し、ｐＨを種々変えたときのアルカリ添加後の汚泥の脱水性及び濁度を測定した。ＮａＯＨとしては５ｗｔ％水溶液を用いた。脱水性の指標値としてはＣＳＴ値を用いた。濁度は光路長２０ｍｍのセルを用い、波長６６０ｎｍにて測定した。
<Dehydration test of mixed sludge when slaked lime is replaced with NaOH>
Addition of slaked lime or NaOH to mixed sludge mixed with 30% by weight of excess sludge, 34% by weight of calcium phosphate sludge and 36% by weight of aluminum-based coagulated sludge, and dehydration and turbidity of sludge after addition of alkali when pH is changed variously The degree was measured. As NaOH, a 5 wt% aqueous solution was used. The CST value was used as the dehydrating index value. Turbidity was measured at a wavelength of 660 nm using a cell having an optical path length of 20 mm.
ＣＳＴ値は、濾紙の両面を挟む一対の電極接点が濾紙の上下方向に複数対配置された計器（ＣＳＴ計）で測定された値（Ｃａｐｉｌｌａｒｙ Ｓｕｃｔｉｏｎ Ｔｉｍｅ：秒）である。このＣＳＴ値は次のようにして計測される。上記ＣＳＴ計の濾紙の先端を原汚泥や脱水濾液のような試料溶液に浸漬する。そのとき、毛管現象によって試料溶液は吸いあげられるが、電極接点の位置まで上昇すると両極間が通電状態になる。したがって、複数対の電極接点間を試料溶液が通過する時間を測定することにより、試料溶液の移動速度を検知することができ、その時間の大小で試料溶液の性状を把握することができる。この通過時間がＣＳＴ値であり、汚泥の脱水性の指標となる。このテストの結果を表３に示す。 The CST value is a value (Capillary Suction Time: seconds) measured by a meter (CST meter) in which a plurality of pairs of electrode contacts sandwiching both sides of the filter paper are arranged in the vertical direction of the filter paper. This CST value is measured as follows. The tip of the filter paper of the CST meter is immersed in a sample solution such as raw sludge or dehydrated filtrate. At that time, the sample solution is sucked up by capillarity, but when it rises to the position of the electrode contact, the current between the electrodes becomes energized. Therefore, by measuring the time during which the sample solution passes between a plurality of pairs of electrode contacts, the moving speed of the sample solution can be detected, and the property of the sample solution can be grasped based on the amount of time. This passage time is a CST value, which is an indicator of sludge dewaterability. The results of this test are shown in Table 3.
表３の通り、消石灰の代替としてＮａＯＨを添加すると、ＣＳＴ値はＮａＯＨ添加量の増加に伴って増大してしまい、脱水性が低下する。 As shown in Table 3, when NaOH is added as an alternative to slaked lime, the CST value increases with an increase in the amount of NaOH added, and the dehydrating property decreases.
Claims (4)
該混合汚泥に消石灰を１００〜２０００ｍｇ／L添加して脱水することを特徴とする汚泥脱水方法。 In the sludge dewatering method of dewatering the mixed sludge of surplus sludge generated in the activated sludge treatment of organic wastewater and calcium phosphate-containing sludge containing calcium phosphate with a dehydrator,
A sludge dewatering method comprising adding 100 to 2000 mg / L of slaked lime to the mixed sludge for dewatering.
リン酸カルシウム含有汚泥は、該液晶ディスプレイ製造工場でのリン酸エッチング廃水を消石灰によりリン酸不溶化処理する工程で発生するリン酸カルシウム含有汚泥であることを特徴とする汚泥脱水方法。 In Claim 1 or 2, the organic waste water is at least one kind of a development waste liquid in a liquid crystal display manufacturing factory, a resist stripping waste water, and an organic acid etching waste water,
The sludge dewatering method, wherein the calcium phosphate-containing sludge is a calcium phosphate-containing sludge generated in a step of insolubilizing phosphoric acid etching wastewater at the liquid crystal display manufacturing plant with slaked lime.
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| CN104692609A (en) * | 2013-12-06 | 2015-06-10 | 赵雪莲 | Soil-water mixture dispensing method applicable to vacuum dehydration |
| RU2576202C2 (en) * | 2014-07-15 | 2016-02-27 | Сивун Игорь Викторович | Method for processing sludge waste |
| JP7107714B2 (en) * | 2018-03-24 | 2022-07-27 | 株式会社日吉 | Slurry property measuring device and slurry property measuring method |
| CN111748819B (en) * | 2020-06-18 | 2021-06-01 | 河海大学 | Rust inhibitor prepared from phosphorus-containing sludge, and preparation method and application thereof |
| CN115259597A (en) * | 2022-08-01 | 2022-11-01 | 无锡国联环保科技股份有限公司 | Acid-base type pyrohydrolysis method and system for municipal sludge |
| CN117023944B (en) * | 2023-10-08 | 2024-01-23 | 杭州尚善若水环保科技有限公司 | Sludge mixing dehydration method in LCD manufacturing industry |
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| FR2383132A1 (en) * | 1977-03-08 | 1978-10-06 | Zundel Jean | Treating biological sludge to sterilise and reduce volume - by heating with sulphuric, phosphoric and calcium ions |
| JPS58143897A (en) * | 1982-02-17 | 1983-08-26 | Ebara Infilco Co Ltd | Dehydration of sludge |
| JPS61125489A (en) * | 1984-11-22 | 1986-06-13 | Ebara Infilco Co Ltd | Treatment of organic waste liquid |
| JPS63175700A (en) * | 1987-01-13 | 1988-07-20 | Mitsubishi Paper Mills Ltd | Treatment of sludge |
| DK169066B1 (en) * | 1987-02-27 | 1994-08-08 | N Viro Energy Systems Ltd | Process for the treatment of sewage sludge |
| JPH0632833B2 (en) * | 1987-09-30 | 1994-05-02 | 荏原インフイルコ株式会社 | Organic wastewater treatment method |
| JPH01159099A (en) * | 1987-12-15 | 1989-06-22 | Meidensha Corp | Method for suppressing generation of corrosive gas from activated sludge |
| JPH03119040A (en) * | 1989-09-30 | 1991-05-21 | Sekisui Chem Co Ltd | Method for treating waste water from emulsion adhesive |
| JPH03275200A (en) * | 1990-03-26 | 1991-12-05 | Kurita Water Ind Ltd | Thickening and dehydrating method for organic sludge |
| JP2761286B2 (en) * | 1990-08-10 | 1998-06-04 | 株式会社日立製作所 | Method for treating wastewater from printed circuit board manufacturing |
| JPH06170398A (en) * | 1992-12-10 | 1994-06-21 | Nippon Steel Corp | Treatment of sludge containing blast furnace water slag in activated sludge treatment |
| JPH06269799A (en) * | 1993-03-17 | 1994-09-27 | Nkk Corp | Treatment of sludge |
| JPH10202271A (en) * | 1997-01-17 | 1998-08-04 | Kurita Water Ind Ltd | Treatment of waste water containing fluorine, phosphoric acid and organic matter |
| JP3684081B2 (en) * | 1998-08-10 | 2005-08-17 | シャープ株式会社 | Wastewater treatment equipment |
| JP4525380B2 (en) * | 2005-02-23 | 2010-08-18 | 栗田工業株式会社 | Treatment method of wastewater containing rare earth |
| CN1986788B (en) * | 2006-12-12 | 2013-01-30 | 广州普得环保设备有限公司 | Sludge dewatering chemical amendment and its dewatering method |
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