JP3339352B2 - Sludge treatment method - Google Patents
Sludge treatment methodInfo
- Publication number
- JP3339352B2 JP3339352B2 JP04600597A JP4600597A JP3339352B2 JP 3339352 B2 JP3339352 B2 JP 3339352B2 JP 04600597 A JP04600597 A JP 04600597A JP 4600597 A JP4600597 A JP 4600597A JP 3339352 B2 JP3339352 B2 JP 3339352B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- treatment
- aluminum
- sewage
- water
- 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.)
- Expired - Fee Related
Links
Landscapes
- Removal Of Specific Substances (AREA)
- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、上水処理および下
水処理における汚泥の処理方法に関する。The present invention relates to a method for treating sludge in water treatment and sewage treatment.
【０００２】[0002]
【従来の技術】従来、一般的な浄水場では、河川、貯水
池、湖沼または井戸から取水された原水に、混和池でポ
リ塩化アルミニウム（ＰＡＣ）または硫酸アルミニウム
（硫酸ばん土）を加えて混合し、フロック形成池で懸濁
質をフロック化し、沈殿池で沈降せしめる。沈降処理上
澄水は、さらに急速ろ過池で砂ろ過し、滅菌槽で塩素滅
菌を行って、上水として供給される。一方、沈殿池より
引き抜いた汚泥は汚泥濃縮槽で重力沈降濃縮処理を行
い、得られた濃縮汚泥は汚泥貯留槽に貯留された後、脱
水機で脱水され、脱水ケーキが得られる。2. Description of the Related Art Conventionally, in a general water purification plant, polyaluminum chloride (PAC) or aluminum sulfate (sodium sulfate) is added to raw water taken from a river, a reservoir, a lake or a well, and mixed in a mixing pond. Then, the suspended solids are flocculated in the flocculation pond and settled in the sedimentation pond. The sedimentation-treated supernatant water is further subjected to sand filtration in a rapid filtration pond, chlorine sterilization in a sterilization tank, and supplied as clean water. On the other hand, the sludge extracted from the sedimentation basin is subjected to gravity settling treatment in a sludge concentration tank, and the obtained concentrated sludge is stored in a sludge storage tank and then dewatered by a dehydrator to obtain a dewatered cake.
【０００３】凝集沈殿池より引き抜かれた汚泥は、凝集
剤に起因する水酸化アルミニウムを含むため、非常に難
脱水性である。脱水性を改善する汚泥の処理方法の一つ
が、酸処理法である。酸処理法は、沈殿池で堆積した汚
泥を引き抜き、汚泥濃縮槽で重力濃縮を行って濃縮汚泥
を得る。ここで得られる濃縮汚泥は、通常、固形物濃度
で約０．５〜０．３％の濃度で、スラリー状である。次
にこの濃縮汚泥を酸処理槽に送り、ここで硫酸を加えて
ｐＨをおおよそ２として撹拌し、汚泥中のアルミニウム
分を硫酸アルミニムとして溶出させる。溶出した硫酸ア
ルミニウムは、硫酸アルミニウム溶液として取り出し、
再生ばん土貯留槽に貯留して、再生ばん土として浄水場
内において水処理用凝集剤として再利用される。一方、
酸処理槽内において沈降した活性汚泥に対して消石灰を
添加した後、汚泥貯留槽に貯留し、脱水機を用いて脱水
して、脱水ケーキを得る。[0003] The sludge extracted from the coagulation sedimentation basin is very hard to dehydrate because it contains aluminum hydroxide caused by the coagulant. One of the sludge treatment methods for improving the dewatering property is an acid treatment method. In the acid treatment method, sludge deposited in a sedimentation basin is extracted, and gravity concentration is performed in a sludge concentration tank to obtain concentrated sludge. The concentrated sludge obtained here is usually in a slurry state at a concentration of about 0.5 to 0.3% in solid matter concentration. Next, the concentrated sludge is sent to an acid treatment tank, where sulfuric acid is added to adjust the pH to approximately 2, and the mixture is stirred to elute aluminum in the sludge as aluminum sulfate. The eluted aluminum sulfate is taken out as an aluminum sulfate solution,
It is stored in the reclaimed soil storage tank and reused as reclaimed soil in the water treatment plant as a coagulant for water treatment. on the other hand,
After adding slaked lime to the activated sludge settled in the acid treatment tank, the sludge is stored in a sludge storage tank and dehydrated using a dehydrator to obtain a dewatered cake.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上述の酸処理
法は以下に説明する欠点を有する。すなわち、汚泥濃縮
槽で得られる濃縮汚泥の濃度が低いために、酸処理槽の
必要容量が大きくなり、かつ、酸処理槽での酸処理によ
り得られる硫酸アルミニウム溶液は、アルミニウム濃度
がＡｌ2 Ｏ3 換算でおおよそ０．３％と希薄であり、し
かも大量に生成されるため、再生ばん土貯留槽の必要量
も大きくしなければらない。酸処理槽および再生ばん土
貯留槽の材質は、いずれも耐酸性でなければならない。
このため、必要容量が大きくなることは経済的に不利で
ある。However, the above-mentioned acid treatment method has the following disadvantages. That is, since the concentration of the concentrated sludge obtained in the sludge thickening tank is low, the required capacity of the acid treatment tank increases, and the aluminum sulfate solution obtained by the acid treatment in the acid treatment tank has an aluminum concentration of Al 2 O. Since it is as thin as about 0.3% in terms of 3 and is produced in large quantities, the required amount of recycled sand storage tank must be increased. The material of the acid treatment tank and the reclaimed soil storage tank must both be acid-resistant.
Therefore, it is economically disadvantageous to increase the required capacity.
【０００５】また、再生ばん土を上水処理用凝集剤とし
て再利用する場合、再生ばん土のアルミニウム濃度が希
薄であるために、さらに希釈して濃度を一定にするため
には大量の希釈用水が必要となり、また、注入ポンプの
必要容量も大きくなる。また、汚泥中に含まれていた、
鉄（Ｆｅ）、マンガン（Ｍｎ）が再生ばん土中にも含有
されたまま凝集沈殿処理工程に投入されるため、上水が
着色してしまう。[0005] Further, when the recycled soil is reused as a coagulant for water treatment, a large amount of diluting water is required to further dilute and keep the concentration constant because the aluminum concentration of the recycled soil is low. And the required capacity of the infusion pump also increases. Also, it was contained in the sludge,
Since iron (Fe) and manganese (Mn) are supplied to the coagulation-sedimentation treatment step while being contained in the reclaimed soil, water is colored.
【０００６】一方、再生ばん土を浄水場とは別の場所に
設置される下水処理場で、下水の脱リン処理に用いる場
合、下水処理水に対する色度の要求は上水の場合に比べ
て寛容であるが、浄水場から下水処理場へ輸送すべき再
生ばん土の液量が多いため、輸送コストが高くついてし
まう。On the other hand, when reclaimed soil is used for dephosphorization of sewage in a sewage treatment plant installed at a place different from a water purification plant, the chromaticity requirement for sewage treated water is higher than that for clean water. Although it is generous, transportation costs are high due to the large volume of recycled soil to be transported from the water treatment plant to the sewage treatment plant.
【０００７】本発明は、かかる点に鑑みてなされたもの
であり、浄水場での酸処理法による汚泥処理において、
酸処理槽での濃縮汚泥の酸処理によって得られるアルミ
ニウム塩を含有する混合液中のアルミニウム分を、下水
処理場での下水処理に利用することができると共に、さ
らに浄水場における酸処理プロセスの簡略化をも図るこ
とができる汚泥の処理方法を提供する。[0007] The present invention has been made in view of such a point, and in the sludge treatment by an acid treatment method in a water purification plant,
The aluminum content in the mixed solution containing the aluminum salt obtained by the acid treatment of the concentrated sludge in the acid treatment tank can be used for the sewage treatment at the sewage treatment plant, and furthermore, the acid treatment process at the water purification plant is simplified. Provided is a method for treating sludge, which can also promote the conversion of sludge.
【０００８】[0008]
【課題を解決するための手段】本発明者らは、上記課題
を解決するために、酸処理によって回収される硫酸アル
ミニウムの高濃度化を図るため、固形物濃度で５％以上
に濃縮または脱水した汚泥または脱水ケーキに対して酸
処理を行うことによって高濃度の硫酸アルミニウム混合
液を生成させ、この硫酸アルミニウム混合液の硫酸アル
ミニウム溶液と残渣汚泥とに分離し、得られた高濃度の
硫酸アルミニウム溶液を浄水場での水処理用凝集剤また
は下水処理場での下水の脱リン処理用凝集剤として利用
する方法を提案している（特願平８−１９４６９２号、
特願平８−３０７９号、特願平８−１９４６９３）。Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors concentrated or dehydrated the solid content to 5% or more in order to increase the concentration of aluminum sulfate recovered by acid treatment. The concentrated sludge or dewatered cake is subjected to an acid treatment to generate a high-concentration aluminum sulfate mixed solution, which is separated into an aluminum sulfate solution of the aluminum sulfate mixed solution and residual sludge, and the obtained high-concentration aluminum sulfate is obtained. A method is proposed in which the solution is used as a coagulant for water treatment in a water purification plant or a coagulant for dephosphorization of sewage in a sewage treatment plant (Japanese Patent Application No. 8-194692).
Japanese Patent Application No. 8-3079, Japanese Patent Application No. 8-194693).
【０００９】これらの方法のうち、得られた高濃度の硫
酸アルミニウム溶液を下水処理場での下水の脱リン処理
用凝集剤として利用する方法について、工業的規模での
運転を実現するためにさらに研究開発を進めたところ、
次のような幾つかのさらに改善すべき課題が知見され
た。Among these methods, the method of using the obtained high-concentration aluminum sulfate solution as a flocculant for dephosphorization of sewage in a sewage treatment plant is further required to realize operation on an industrial scale. After research and development,
Several issues were identified that needed further improvement, including:
【００１０】その課題の第一は、硫酸アルミニウム混合
液を硫酸アルミニウム溶液と残渣汚泥とに分離する際
に、濾過処理または遠心分離処理を用いても残渣汚泥側
に硫酸アルミニウム溶液が残ってしまうため、アルミニ
ウムの回収率（硫酸アルミニウム混合液中の全アルミニ
ウム量に対して硫酸アルミニウム溶液中として回収され
るアルミニウム量の割合）を１００％にすることができ
ないという点である。The first problem is that when the aluminum sulfate mixed solution is separated into the aluminum sulfate solution and the residual sludge, the aluminum sulfate solution remains on the residual sludge side even if filtration or centrifugation is used. Another problem is that the recovery rate of aluminum (the ratio of the amount of aluminum recovered in the aluminum sulfate solution to the total amount of aluminum in the aluminum sulfate mixed solution) cannot be 100%.
【００１１】特に、回収硫酸アルミニウム溶液中のアル
ミニウム濃度を高めることを目的として、酸処理を施す
汚泥の固形物濃度を５％以上に高めて酸処理を行なった
場合、得られる回収硫酸アルミニウム混合溶液中のアル
ミニウム濃度は酸処理を施す汚泥の固形物濃度に比例し
て高くなる。しかし、逆にアルミニウムの回収率は低下
してしまう。例えば、固形物濃度が１０％および２０％
の濃縮汚泥に対して硫酸処理を施して加圧脱水機による
濾過処理で硫酸アルミニウム含有液と残渣汚泥とに分離
した場合、得られる硫酸アルミニウム含有液中のＡｌ2
Ｏ3 濃度は、それぞれ２．３％および４．５％になるの
に対し、アルミニウムの回収率は、それぞれ９３％およ
び８５％になる。アルミニウムの回収率が低くなると下
水の脱リン処理用凝集剤としての硫酸アルミニウム溶液
のコストが高くなって下水処理場側での経済性が薄れる
ばかりでなく、浄水場側においても残渣汚泥中に硫酸ア
ルミニウム溶液が残ると脱水性の改善が不充分となり、
かつ後工程での中和処理に必要なアルカリ剤の量が増え
て経済的に不利であるし、また残渣汚泥を減容化して農
業利用する場合においてもアルミ分を多く含むことは好
ましくない。Particularly, when the sludge to be subjected to the acid treatment is subjected to the acid treatment by increasing the solid concentration to 5% or more for the purpose of increasing the aluminum concentration in the recovered aluminum sulfate solution, the resulting mixed solution of the recovered aluminum sulfate is obtained. The aluminum concentration therein increases in proportion to the solids concentration of the sludge subjected to the acid treatment. However, on the contrary, the recovery rate of aluminum decreases. For example, solids concentrations of 10% and 20%
When the concentrated sludge is subjected to a sulfuric acid treatment and separated into an aluminum sulfate-containing liquid and a residual sludge by a filtration treatment with a pressure dehydrator, Al 2 in the obtained aluminum sulfate-containing liquid is removed.
The O 3 concentration amounts to 2.3% and 4.5%, respectively, while the recovery of aluminum amounts to 93% and 85%, respectively. When the recovery rate of aluminum decreases, the cost of aluminum sulfate solution as a flocculant for sewage dephosphorization treatment increases, which not only reduces the economics at the sewage treatment plant, but also reduces sulfuric acid in the residual sludge at the water treatment plant. If the aluminum solution remains, the improvement of dehydration becomes insufficient,
In addition, it is economically disadvantageous because the amount of the alkali agent required for the neutralization treatment in the subsequent step is increased, and it is not preferable that a large amount of aluminum is contained even when the residual sludge is reduced in volume for agricultural use.
【００１２】またその第二は、残渣汚泥の脱水処理に際
して脱水ケーキを無害化するために中和処理設備が必要
であり、通常の無薬注脱水処理による汚泥の処理方法に
比べてプロセスが複雑となってしまうという点である。Secondly, a neutralization treatment facility is required to detoxify the dewatered cake during the dewatering treatment of the residual sludge, and the process is more complicated than the usual sludge treatment method by chemical-free dewatering. The point is that
【００１３】本発明者らは、かかる新たに見出された課
題を解決すべく鋭意検討した結果、上水原水にアルミニ
ウムを含む無機系凝集剤を添加して得られる上水汚泥に
酸処理を行って硫酸アルミニウム等のアルミニウム塩を
回収する汚泥の処理方法において、当該汚泥に酸を加え
て得られるアルミニウム含有混合液から残渣汚泥を分離
することなく、その少なくとも一部を下水の脱リン処理
に用いることにより、アルミニムを高効率で利用し、設
備が小規模で済みかつ低コストな上水および下水処理を
実現できることを見出し、本発明を完成した。The inventors of the present invention have conducted intensive studies to solve such a newly found problem, and as a result, have conducted acid treatment on clean water sludge obtained by adding an inorganic coagulant containing aluminum to clean water. In a method for treating sludge, which is performed to collect aluminum salts such as aluminum sulfate, without separating residual sludge from an aluminum-containing mixed solution obtained by adding an acid to the sludge, at least a part of the sludge is subjected to a dephosphorization treatment of sewage. The present inventors have found that by using aluminum, aluminum can be used with high efficiency, the equipment can be reduced in size, and low-cost water and sewage treatment can be realized, and the present invention has been completed.
【００１４】すなわち、本発明は、上水および下水にお
ける汚泥の処理方法において、上水原液にアルミニウム
を含む無機系凝集剤を添加して得られる上水汚泥に酸を
添加して得られるアルミニウム塩および汚泥を含有する
混合液の少なくとも一部を、下水の脱リン処理のための
脱リン用凝集剤として利用することを特徴とする汚泥の
処理方法を提供する。That is, the present invention relates to a method for treating sludge in tap water and sewage, wherein an aluminum salt obtained by adding an acid to tap water sludge obtained by adding an inorganic coagulant containing aluminum to a tap water stock solution. And a method of treating sludge, wherein at least a part of a mixed liquid containing sludge is used as a dephosphorizing coagulant for sewage dephosphorization treatment.
【００１５】この汚泥の処理方法は、上水汚泥を固形物
濃度が５％以上になるように濃縮および／または脱水し
た後に、濃縮および／または脱水された上水汚泥に酸を
添加することが好ましい。In this method for treating sludge, water is concentrated and / or dehydrated so that the solid content becomes 5% or more, and then an acid is added to the concentrated and / or dewatered water sludge. preferable.
【００１６】[0016]
【発明の実施の形態】以下、本発明の実施形態について
説明する。本発明の汚泥の処理方法の実施形態は、例え
ば、以下のような上水処理および下水処理に適用され
る。Embodiments of the present invention will be described below. The embodiment of the sludge treatment method of the present invention is applied to, for example, the following water supply treatment and sewage treatment.
【００１７】＜上水処理＞ （１）混和池において、上水原液（原水）に少なくとも
アルミニウムを含有する無機系凝集剤を添加し、原水中
の懸濁粒子を凝集させて、懸濁質とする。<Water Treatment> (1) In a mixing pond, an inorganic coagulant containing at least aluminum is added to a stock water solution (raw water) to agglomerate suspended particles in the raw water to form a suspension. I do.
【００１８】（２）フロック形成池において、無機系凝
集剤を添加した原水中の懸濁質をフロック化する。 （３）沈殿池において、原水中のフロック化した懸濁質
を沈殿させて、第１上澄水と、上水汚泥とに分離する。(2) In the floc forming pond, the suspended matter in the raw water to which the inorganic coagulant has been added is flocculated. (3) In the sedimentation basin, flocculated suspended solids in the raw water are settled and separated into first supernatant water and clean water sludge.
【００１９】（４）上水汚泥を濃縮および／または脱水
して濃縮汚泥を得る。この濃縮処理または脱水処理は、
汚泥の固形物濃度が５％未満である場合に、アルミニウ
ム濃度がＡｌ2 Ｏ3 換算で１％以上のアルミニウム塩を
含有する混合液を回収することが困難になる。このた
め、圧縮汚泥の固形物濃度が５％以上、好ましくは約５
〜４０％になるように、濃縮および／または脱水するこ
とが好ましい。(4) The concentrated sludge is obtained by concentrating and / or dewatering the tap water sludge. This concentration or dehydration treatment
When the solid content of the sludge is less than 5%, it becomes difficult to collect a mixed solution containing an aluminum salt having an aluminum concentration of 1% or more in terms of Al 2 O 3 . For this reason, the solid concentration of the compressed sludge is 5% or more, preferably about 5%.
It is preferable to perform concentration and / or dehydration so as to be 〜40%.
【００２０】濃縮処理は、例えば、汚泥濃縮槽での重力
沈降または遠心濃縮機により行なわれる。脱水処理に
は、例えば、遠心脱水機、加圧脱水機、真空脱水機また
はベルトプレス脱水機が使用される。ここで分離された
第２上澄水は、混和池に戻される。The concentration treatment is performed, for example, by gravity sedimentation in a sludge concentration tank or a centrifugal concentrator. For the dehydration treatment, for example, a centrifugal dehydrator, a pressure dehydrator, a vacuum dehydrator or a belt press dehydrator is used. The second supernatant water separated here is returned to the mixing pond.
【００２１】無機系凝集剤の添加量が多く、汚泥中のア
ルミニウム濃度が十分に高い場合には、濃縮および脱水
は行わなくとも良いが、無機系凝集剤のコストが高くな
るため経済的でない。When the amount of the inorganic coagulant is large and the concentration of aluminum in the sludge is sufficiently high, concentration and dehydration do not have to be performed, but the cost of the inorganic coagulant is high, which is not economical.
【００２２】（５）酸処理槽において、濃縮汚泥に酸、
例えば硫酸または塩酸を添加し、濃縮汚泥中のアルミニ
ウム分を酸と反応させ、水溶性の塩を形成させる。これ
により、このアルミニウム塩および酸処理後の濃縮汚泥
（以下、残渣汚泥という）を含む混合液（以下、アルミ
ニウム塩含有混合液という）が得られる。(5) In the acid treatment tank, acid,
For example, sulfuric acid or hydrochloric acid is added, and the aluminum component in the concentrated sludge is reacted with an acid to form a water-soluble salt. Thereby, a mixed solution (hereinafter, referred to as an aluminum salt-containing mixed solution) containing the aluminum salt and the concentrated sludge after the acid treatment (hereinafter, referred to as a residual sludge) is obtained.
【００２３】酸処理に硫酸を用いる場合、硫酸として
は、濃度９０％以上の濃硫酸、好ましくは濃度９６％以
上の濃硫酸を用い、ｐＨを５以下、好ましくは１〜３に
調整する。この場合、汚泥中のアルミニウム分が硫酸と
反応して硫酸アルミニウムが形成される。When sulfuric acid is used for the acid treatment, concentrated sulfuric acid having a concentration of 90% or more, preferably 96% or more is used, and the pH is adjusted to 5 or less, preferably 1 to 3. In this case, the aluminum component in the sludge reacts with sulfuric acid to form aluminum sulfate.
【００２４】本発明の汚泥の処理方法では、このアルミ
ニウム塩含有混合液の少なくとも一部を、下水処理場に
輸送し、後述の下水処理で脱リン処理用凝集剤として利
用する。In the method for treating sludge of the present invention, at least a part of the mixed solution containing the aluminum salt is transported to a sewage treatment plant and used as a coagulant for dephosphorization in sewage treatment described below.
【００２５】（７）一方、第１上澄水は、急速濾過池に
おいて濾過される。 （８）滅菌槽において、濾過された第１上澄水が滅菌処
理され、上水として各家庭に供給される。(7) On the other hand, the first supernatant water is filtered in the rapid filtration pond. (8) In the sterilization tank, the filtered first supernatant water is sterilized and supplied to each household as clean water.
【００２６】＜下水処理＞ （１）最初沈殿池において、下水中の懸濁質を沈殿させ
て、第１下水汚泥を得る。<Sewage treatment> (1) In the first sedimentation basin, the suspended matter in the sewage is settled to obtain the first sewage sludge.
【００２７】（２）残された下水を曝気槽に導入し、曝
気処理を行う。 （３）曝気処理後の下水を最終沈殿池に導入し、上澄水
と第２下水汚泥とに分離する。(2) The remaining sewage is introduced into an aeration tank to perform aeration treatment. (3) The sewage after the aeration treatment is introduced into the final sedimentation basin and separated into supernatant water and second sewage sludge.
【００２８】（４）第１下水汚泥および第２下水汚泥を
下水処理用の汚泥濃縮槽に導入し、濃縮し、下水側濃縮
汚泥を得る。下水側濃縮汚泥を必要に応じて汚泥貯留槽
に貯留する。第２下水汚泥の一部は曝気槽に返送され
る。(4) The first sewage sludge and the second sewage sludge are introduced into a sludge concentration tank for sewage treatment and concentrated to obtain sewage-side concentrated sludge. The concentrated sewage sludge is stored in the sludge storage tank as needed. Part of the second sewage sludge is returned to the aeration tank.
【００２９】（５）下水側濃縮汚泥を、脱水機により脱
水して、脱水ケーキを得る。 （６）一方、上澄水は、滅菌槽において滅菌処理され、
処理水として環境中に排出される。(5) The concentrated sewage sludge is dewatered by a dehydrator to obtain a dewatered cake. (6) On the other hand, the supernatant water is sterilized in a sterilization tank,
Released into the environment as treated water.
【００３０】本発明に係る汚泥の処理方法の実施形態で
は、上述の下水処理において、上記上水処理で得られた
アルミニウム塩含有混合液の全部または一部を、脱リン
処理用凝集剤として利用する。具体的には、最終沈殿液
から流出する上澄水にアルミニウム塩含有混合液を添加
するかまたは曝気槽中の下水に添加する。In an embodiment of the sludge treatment method according to the present invention, in the above-mentioned sewage treatment, all or a part of the aluminum salt-containing mixed solution obtained in the above-mentioned water treatment is used as a coagulant for dephosphorization treatment. I do. Specifically, an aluminum salt-containing mixture is added to the supernatant water flowing out of the final sedimentation liquid, or to the sewage in an aeration tank.
【００３１】下水に対するアルミニウム塩含有混合液の
添加量は、下水中の溶解性リン１モルに対してアルミニ
ウム塩含有混合液中のアルミニウムのモル比が、例えば
０．５〜１０、好ましくは１〜２になるように調整す
る。The amount of the aluminum salt-containing mixture added to the sewage is such that the molar ratio of aluminum in the aluminum salt-containing mixture to 1 mol of soluble phosphorus in the sewage is, for example, 0.5 to 10, preferably 1 to 10. Adjust to 2
【００３２】ここで、アルミニウム塩混合液の一部を脱
リン処理用混合液に利用した場合、残ったアルミニウム
塩混合液に濾過処理および／または遠心分離処理を施す
ことによって硫酸アルミニウム溶液と残渣汚泥とに分離
する。この濾過処理または遠心分離処理には、加圧脱水
機、真空脱水機、ベルトプレス脱水機、遠心濃縮機、遠
心脱水機、などの装置を用いることができ、アルミニウ
ム塩を含有する水溶液はこれらの装置から排出される分
離液として回収できる。一方、アルミニウム円が分離さ
れた残渣汚泥に対してアルカリ剤を添加することによっ
て中和処理を行い、加圧脱水機、真空脱水機になどよっ
て脱水処理し、脱水ケーキを得ることができる。When a part of the aluminum salt mixture is used for the dephosphorization treatment mixture, the remaining aluminum salt mixture is subjected to a filtration treatment and / or a centrifugation treatment, whereby the aluminum sulfate solution and the residual sludge are removed. And separated into For this filtration treatment or centrifugal separation treatment, devices such as a pressure dehydrator, a vacuum dehydrator, a belt press dehydrator, a centrifugal concentrator, a centrifugal dehydrator, and the like can be used. It can be collected as a separated liquid discharged from the device. On the other hand, a neutralization treatment is performed by adding an alkaline agent to the residual sludge from which the aluminum circle has been separated, and a dehydration treatment is performed by a pressure dehydrator, a vacuum dehydrator, or the like, to obtain a dehydrated cake.
【００３３】以上説明した本発明の汚泥の処理方法の実
施形態によれば、ＰＡＣ等のアルミニウムを含有する無
機系凝集剤を使用する浄水場において発生する上水汚泥
に対して酸処理を施すことにより得られるアルミニウム
塩含有混合液は、アルミニウム濃度がＡｌ2 Ｏ3 換算で
１〜８％であり、アルミニウム塩含有混合液から残留汚
泥が分離されたアルミニウム塩を含有する水溶液に比べ
て約２０倍以上に高濃度のものを得ることができる。こ
の高濃度でアルミニウム塩を含有する硫酸アルミニウム
混合液を、下水処理における脱リン処理用凝集剤として
利用することにより、酸処理によって回収されるアルミ
ニウム分の大部分を利用できる。従って、浄水場側にお
いては酸処理に用いる酸処理槽および再生ばん土貯留槽
の大きさを約１０分の１に小型化でき、さらに残渣汚泥
の処理のための設備が不要になるか非常に小規模のもの
で済むこととなる。According to the above-described embodiment of the sludge treatment method of the present invention, acid treatment is applied to water sludge generated in a water purification plant using an inorganic coagulant containing aluminum such as PAC. The aluminum salt-containing mixed solution obtained by the above method has an aluminum concentration of 1 to 8% in terms of Al 2 O 3 , and is about 20 times as large as an aluminum salt-containing aqueous solution in which residual sludge is separated from the aluminum salt-containing mixed solution. Higher concentrations can be obtained as described above. By using the aluminum sulfate mixed solution containing an aluminum salt at a high concentration as a coagulant for dephosphorization treatment in sewage treatment, most of the aluminum component recovered by acid treatment can be used. Therefore, on the water treatment plant side, the size of the acid treatment tank and the reclaimed soil storage tank used for acid treatment can be reduced to about one-tenth, and equipment for treating residual sludge becomes unnecessary or extremely unnecessary. Only small ones will be needed.
【００３４】また、本実施形態に係る汚泥の処理方法に
よれば、処理回収されるアルミニウム塩含有混合液中の
アルミニウム塩の濃度が高く、かつ、アルミニウムの回
収率が高いので、安価な下水用脱リン処理剤の提供が可
能となり、下水処理場側での下水脱リン処理費用の大幅
な削減を図ることができる。Further, according to the sludge treatment method according to the present embodiment, since the concentration of the aluminum salt in the aluminum salt-containing mixed liquid to be treated and recovered is high and the recovery rate of aluminum is high, an inexpensive sewage treatment is possible. It is possible to provide a dephosphorizing agent, and it is possible to significantly reduce the cost of sewage dephosphorization treatment at the sewage treatment plant.
【００３５】[0035]
【実施例】以下、本発明の実施例について、添付図面を
参照して具体的に説明する。 実施例１ 図１に示すように、浄水場１１において、取水した原水
に対して、混和池１２で無機系凝集剤としてポリ塩化ア
ルミニウム（ＰＡＣ）を加えて混合し、次いで、フロッ
ク形成池１３で懸濁質をフロック化した後、沈殿池１４
で沈降分離処理して、上澄水と上水汚泥とに分離した。
ここで得られた上澄水はさらに急速ろ過池１５で砂ろ過
され、滅菌槽１６で塩素滅菌して、上水として供給し
た。Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. Example 1 As shown in FIG. 1, in a water purification plant 11, polyaluminum chloride (PAC) was added as an inorganic coagulant to a raw water taken in a mixing pond 12 and mixed. After flocculating the suspended solids, the sedimentation basin 14
And separated into supernatant water and tap water sludge.
The supernatant water obtained here was further subjected to sand filtration in the rapid filtration pond 15, sterilized with chlorine in the sterilization tank 16, and supplied as clean water.
【００３６】一方、沈殿池１５より引き抜いた上水汚泥
を、汚泥濃縮槽１７で重力沈降させて濃縮汚泥１８を得
た。ここで得られた濃縮汚泥１８の固形物濃度は１％で
あった。この濃縮汚泥１８に対して遠心分離機１９で濃
縮処理を行った。この結果、固形物濃度１６％の濃縮汚
泥２０が得られた。On the other hand, the water sludge drawn out from the sedimentation basin 15 was settled by gravity in the sludge concentration tank 17 to obtain a concentrated sludge 18. The solid matter concentration of the concentrated sludge 18 obtained here was 1%. The concentrated sludge 18 was subjected to a concentration treatment by a centrifugal separator 19. As a result, concentrated sludge 20 having a solid concentration of 16% was obtained.
【００３７】この濃縮汚泥２０を酸処理槽２１に送り、
９８％の濃度の濃硫酸を加えてｐＨ２に調整し、１時間
撹拌を行って、硫酸アルミニウム混合液２２を得た。こ
の硫酸アルミニウム混合液２２のアルミニウム濃度を測
定したところ、Ａｌ2 Ｏ3 換算値で２．９％であった。
この硫酸アルミニウム混合液２２のアルミニウム濃度
は、酸処理後の硫酸アルミニウム混合液２２から汚泥を
分離して得られる硫酸アルミニウム溶液よりも約１０倍
高かった。The concentrated sludge 20 is sent to an acid treatment tank 21,
98% concentrated sulfuric acid was added to adjust the pH to 2, and the mixture was stirred for 1 hour to obtain an aluminum sulfate mixed solution 22. When the aluminum concentration of this aluminum sulfate mixed solution 22 was measured, it was 2.9% in terms of Al 2 O 3 .
The aluminum concentration of the aluminum sulfate mixture 22 was about 10 times higher than the aluminum sulfate solution obtained by separating sludge from the aluminum sulfate mixture 22 after the acid treatment.
【００３８】この硫酸アルミニウム混合液２２を、一
旦、再生ばん土貯留槽２３に貯留した後、下水処理場３
０に輸送した。下水処理場３０では、下水処理を行い、
下水の脱リン用凝集剤として硫酸アルミニウム混合液２
２を利用した。下水処理場３０での下水処理は以下の通
り行った。まず、最初沈殿池３１において、下水中の懸
濁質を沈殿させて、第１下水汚泥を得た。残された下水
を曝気槽３２に導入し曝気処理を行った。次いで、曝気
処理後の下水を最終沈殿池３３に導入して重力沈降処理
を施し、上澄水と第２下水汚泥とに分離した。第２下水
汚泥の一部は曝気槽３２に返送した。The aluminum sulfate mixed liquid 22 is temporarily stored in a reclaimed soil storage tank 23, and then the sewage treatment plant 3
Transported to 0. The sewage treatment plant 30 performs sewage treatment,
Aluminum sulfate mixed solution 2 as flocculant for dephosphorization of sewage
2 was used. The sewage treatment in the sewage treatment plant 30 was performed as follows. First, the suspended matter in the sewage was settled in the first settling basin 31 to obtain the first sewage sludge. The remaining sewage was introduced into the aeration tank 32 to perform aeration treatment. Next, the sewage after the aeration treatment was introduced into the final sedimentation basin 33, subjected to gravity sedimentation treatment, and separated into supernatant water and second sewage sludge. Part of the second sewage sludge was returned to the aeration tank 32.
【００３９】第１下水汚泥および第２下水汚泥を汚泥濃
縮槽３５に導入し、重力沈降処理により濃縮し、濃縮汚
泥３６を得た。この際に得られた上澄水３７を最初沈殿
池３１に返送した。濃縮汚泥３６を、汚泥貯留槽３８を
経て脱水機３９に導入し、脱水機３９により脱水して、
脱水ケーキを得た。The first sewage sludge and the second sewage sludge were introduced into a sludge concentration tank 35 and concentrated by gravity sedimentation to obtain a concentrated sludge 36. The supernatant water 37 obtained at this time was first returned to the sedimentation basin 31. The concentrated sludge 36 is introduced into a dehydrator 39 through a sludge storage tank 38, and is dehydrated by the dehydrator 39.
A dehydrated cake was obtained.
【００４０】一方、最終沈澱池３３の越流水４０に、越
流水４０中の溶解性リン１モルに対してアルミニウムの
モル比が２となるように、浄水場１１で得られた硫酸ア
ルミニウム混合液２３を添加した。この後、越流水４０
を滅菌槽３４に導入して塩素滅菌処理を行った後に処理
水として排出した。On the other hand, the aluminum sulfate mixed solution obtained in the water purification plant 11 was added to the overflow water 40 of the final sedimentation basin 33 so that the molar ratio of aluminum to 1 mol of soluble phosphorus in the overflow water 40 was 2. 23 was added. After this, overflow water 40
Was introduced into a sterilization tank 34 and subjected to chlorine sterilization treatment, and then discharged as treated water.
【００４１】以上説明した上水および下水処理におい
て、下水中の溶解性リンの除去率は９２％となった。 実施例２ 図２は、実施例２を行った浄水場１１および下水処理場
３０を示す概略図であり、実施例１の浄水場１１および
下水処理場３０と同様の構成については同じ符号を付与
し、説明を省略する。In the above-mentioned water treatment and sewage treatment, the removal rate of soluble phosphorus in the sewage was 92%. Example 2 FIG. 2 is a schematic diagram showing a water purification plant 11 and a sewage treatment plant 30 in which Example 2 was performed, and the same reference numerals are given to the same configurations as the water purification plant 11 and the sewage treatment plant 30 of Example 1. And the description is omitted.
【００４２】図２に示す通り、実施例１と同様にして得
られたの濃縮汚泥１８に対して、脱水機５１により脱水
処理を施した。これにより、得られた脱水ケーキ５２の
固形物濃度は４６％であった。As shown in FIG. 2, the concentrated sludge 18 obtained in the same manner as in Example 1 was subjected to a dehydration treatment by a dehydrator 51. Thereby, the solid matter concentration of the obtained dehydrated cake 52 was 46%.
【００４３】この脱水ケーキ５２を酸処理槽２１に送
り、９８％の濃度の濃硫酸を加えてｐＨ２に調整した
後、１時間撹拝を行って硫酸アルミニウム混合液２２を
得た。得られた硫酸アルミニウム溶液２２のアルミニウ
ム濃度を測定したところＡｌ2 Ｏ3 換算値で８％であ
り、酸処理後の硫酸アルミニウム混合液２２から汚泥を
分離して得られる硫酸アルミニウム溶液よりも約２７倍
高濃度のものを得ることができた。The dehydrated cake 52 was sent to the acid treatment tank 21, adjusted to pH 2 by adding 98% concentrated sulfuric acid, and then stirred for 1 hour to obtain an aluminum sulfate mixed solution 22. When the aluminum concentration of the obtained aluminum sulfate solution 22 was measured, it was 8% in terms of Al 2 O 3 , which was about 27% higher than that of the aluminum sulfate solution obtained by separating sludge from the aluminum sulfate mixed solution 22 after the acid treatment. One-fold higher concentration was obtained.
【００４４】この硫酸アルミニウム混合液２２の一部
を、一旦再生ばん土貯留槽２３に貯留した後、下水処理
場に輸送した。この一部の硫酸アルミニム混合液２２Ａ
を、溶解性リン１モルに対してアルミニウムのモル比が
２となるように曝気槽３２へを添加することに変更した
以外は、実施例１と同様に下水処理を行った。この結
果、溶解性リンの除去率は９１％となった。A part of the aluminum sulfate mixed solution 22 was once stored in a reclaimed soil storage tank 23 and then transported to a sewage treatment plant. This part of aluminum sulfate mixed solution 22A
The sewage treatment was performed in the same manner as in Example 1 except that was added to the aeration tank 32 so that the molar ratio of aluminum to 1 mol of soluble phosphorus was 2. As a result, the removal rate of soluble phosphorus was 91%.
【００４５】一方、残りの硫酸アルミニウム混合液２２
から分離された残渣汚泥５３に対してはカセイソーダ
（ＮａＯＨ）を添加して中和処理を行い、次いで脱水機
５４を用いて脱水して、含水率４５％の脱水ケーキ５５
を得た。On the other hand, the remaining aluminum sulfate mixed solution 22
The residual sludge 53 separated from the wastewater is neutralized by adding caustic soda (NaOH), and then dehydrated using a dehydrator 54 to obtain a dehydrated cake 55 having a water content of 45%.
I got
【００４６】以上説明したように、実施例１および２の
汚泥処理方法により、酸処理後の硫酸アルミニウム混合
液２２から汚泥を分離して得られる硫酸アルミニウム溶
液よりもアルミニウム濃度が高い硫酸アルミニウム混合
液２２が得られ、この硫酸アルミニウム混合液２２を、
下水処理場３０で脱リン用凝集剤として利用することに
より高い溶解性リンの除去率を実現できることが確認さ
れた。As described above, according to the sludge treatment methods of Examples 1 and 2, an aluminum sulfate mixed solution having a higher aluminum concentration than the aluminum sulfate solution obtained by separating sludge from the aluminum sulfate mixed solution 22 after acid treatment. 22 was obtained, and this aluminum sulfate mixed solution 22 was
It was confirmed that a high solubility phosphorus removal rate can be realized by using the compound as a dephosphorization coagulant in the sewage treatment plant 30.
【００４７】[0047]
【発明の効果】以上の説明したように、上水および下水
における汚泥の処理方法において、上水原液にアルミニ
ウムを含む無機系凝集剤を添加して得られる上水汚泥に
酸を添加して得られるアルミニウム塩および汚泥を含有
する混合液の少なくとも一部を、下水の脱リン処理のた
めの脱リン用凝集剤として利用することにより、酸処理
によって回収されるアルミニウム分の大部分を利用でき
る。従って、浄水場側においては酸処理に用いる酸処理
槽および再生ばん土貯留槽を小型化でき、さらに残渣汚
泥の処理のための設備が不要になるか非常に小規模のも
ので済むこととなる。また、処理回収されるアルミニウ
ム塩含有混合液中のアルミニウム塩の濃度が高く、か
つ、アルミニウムの回収率が高いので、安価な下水用脱
リン処理剤の提供が可能となり、下水処理場側での下水
脱リン処理費用の大幅な削減を図ることができる。As described above, in the method for treating sludge in tap water and sewage, an acid is added to tap water sludge obtained by adding an inorganic coagulant containing aluminum to a tap water stock solution. By using at least a part of the mixed solution containing the aluminum salt and sludge to be used as a dephosphorizing coagulant for sewage dephosphorization, most of the aluminum recovered by the acid treatment can be used. Therefore, on the water treatment plant side, the acid treatment tank and the reclaimed soil storage tank used for the acid treatment can be reduced in size, and furthermore, the equipment for treating the residual sludge is not required or can be very small. . In addition, since the concentration of the aluminum salt in the aluminum salt-containing mixed solution to be treated and recovered is high, and the recovery rate of aluminum is high, it is possible to provide an inexpensive dephosphorization agent for sewage, and the sewage treatment plant side The cost of sewage dephosphorization can be significantly reduced.
【図１】本発明の汚泥処理方法を適用した実施例１に係
る上水および下水処理設備を示す概略図。FIG. 1 is a schematic diagram showing water and sewage treatment equipment according to a first embodiment to which a sludge treatment method of the present invention is applied.
【図２】本発明の汚泥処理方法を適用した実施例２に係
る上水および下水処理設備を示す概略図。FIG. 2 is a schematic diagram showing water and sewage treatment equipment according to a second embodiment to which the sludge treatment method of the present invention is applied.
１１…浄水場、１２…混和池、１３…フロック形成池、
１４…沈殿池、１５…急速ろ過池、１６…滅菌槽、１７
…汚泥濃縮槽、１８、２０…濃縮汚泥、１９…遠心分離
器、２１…酸処理槽、２２…硫酸アルミニウム混合液、
２３…再生ばん土貯留槽、３０…下水処理場、３１…最
初沈殿池、３２…曝気槽、３３…最終沈殿池、３４…滅
菌槽、３５…汚泥濃縮槽、３８…汚泥貯留槽、３９、５
１、５４…脱水機、５５…脱水ケーキ。11 ... water purification plant, 12 ... mixing pond, 13 ... floc formation pond,
14 ... sedimentation basin, 15 ... rapid filtration pond, 16 ... sterilization tank, 17
... sludge thickening tank, 18, 20 ... thickened sludge, 19 ... centrifugal separator, 21 ... acid treatment tank, 22 ... aluminum sulfate mixed solution,
23 ... reclaimed soil storage tank, 30 ... sewage treatment plant, 31 ... first sedimentation tank, 32 ... aeration tank, 33 ... final sedimentation tank, 34 ... sterilization tank, 35 ... sludge concentration tank, 38 ... sludge storage tank, 39, 5
1, 54: dehydrator, 55: dehydrated cake.
フロントページの続き (56)参考文献 特開 平９−187797（ＪＰ，Ａ) 特開 平５−329498（ＪＰ，Ａ) 特開 平６−269799（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 11/06 C02F 11/00 Continuation of front page (56) References JP-A-9-187797 (JP, A) JP-A-5-329498 (JP, A) JP-A-6-269799 (JP, A) (58) Fields studied (Int) .Cl. 7 , DB name) C02F 11/06 C02F 11/00
Claims (2)
において、上水原液にアルミニウムを含む無機系凝集剤
を添加して得られる上水汚泥に酸を添加して得られるア
ルミニウム塩および汚泥を含有する混合液の少なくとも
一部を、下水の脱リン処理のための脱リン用凝集剤とし
て利用することを特徴とする汚泥の処理方法。1. A method for treating sludge in tap water and sewage, comprising an aluminum salt and sludge obtained by adding an acid to tap water sludge obtained by adding an inorganic coagulant containing aluminum to a stock water solution. A method for treating sludge, comprising using at least a part of a mixed solution to be used as a dephosphorizing coagulant for sewage dephosphorization.
ように濃縮および／または脱水した後に、濃縮および／
または脱水された上水汚泥に酸を添加する請求項１記載
の汚泥の処理方法。2. Concentration and / or dehydration of tap water sludge so as to have a solid concentration of 5% or more.
The method for treating sludge according to claim 1, wherein an acid is added to the dewatered water sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04600597A JP3339352B2 (en) | 1997-02-28 | 1997-02-28 | Sludge treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04600597A JP3339352B2 (en) | 1997-02-28 | 1997-02-28 | Sludge treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10235398A JPH10235398A (en) | 1998-09-08 |
| JP3339352B2 true JP3339352B2 (en) | 2002-10-28 |
Family
ID=12734965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04600597A Expired - Fee Related JP3339352B2 (en) | 1997-02-28 | 1997-02-28 | Sludge treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3339352B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103626337A (en) * | 2013-12-09 | 2014-03-12 | 天津工业大学 | Treatment method of sewage |
| CN105906011A (en) * | 2016-06-14 | 2016-08-31 | 河南城建学院 | Method for preparing flocculant from water treatment plant sludge and application of flocculant to algae removal |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105314816B (en) * | 2014-06-27 | 2018-01-30 | 宝山钢铁股份有限公司 | A kind of sludge continuous dehydration apparatus and method |
| CN104891624A (en) * | 2015-06-25 | 2015-09-09 | 金双蕾 | Water treatment chemical for removing chlorobenzene compounds in water |
| CN105110587B (en) * | 2015-09-29 | 2017-08-01 | 天津壹新环保工程有限公司 | A kind of sludge pretreatment technique with desalting effect |
-
1997
- 1997-02-28 JP JP04600597A patent/JP3339352B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103626337A (en) * | 2013-12-09 | 2014-03-12 | 天津工业大学 | Treatment method of sewage |
| CN103626337B (en) * | 2013-12-09 | 2016-08-24 | 天津工业大学 | A kind of processing method of sewage |
| CN105906011A (en) * | 2016-06-14 | 2016-08-31 | 河南城建学院 | Method for preparing flocculant from water treatment plant sludge and application of flocculant to algae removal |
| CN105906011B (en) * | 2016-06-14 | 2018-10-30 | 河南城建学院 | It is a kind of to prepare the method for flocculant using purification plant sludge and its remove algae application |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10235398A (en) | 1998-09-08 |
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