JP6709036B2 - Hot water recovery system - Google Patents

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JP6709036B2
JP6709036B2 JP2015222442A JP2015222442A JP6709036B2 JP 6709036 B2 JP6709036 B2 JP 6709036B2 JP 2015222442 A JP2015222442 A JP 2015222442A JP 2015222442 A JP2015222442 A JP 2015222442A JP 6709036 B2 JP6709036 B2 JP 6709036B2
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明郎 中川
明郎 中川
浩 赤松
浩 赤松
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岩井ファルマテック株式会社
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本発明は、生産設備からのプロセス水、洗浄水などの温水を有効利用する温水回収システムに関する。 The present invention relates to a hot water recovery system that effectively uses hot water such as process water and washing water from a production facility.

従来、各種生産工場、例えば、食品を生産、加工する工場、製薬設備などでは、原料や容器の洗浄等に温水が使用される。このような温水は、余熱を利用するために熱交換された後、ドレインされていた。また、このような温水は、水道等から新たに受水した水を、ガス等の燃料を用いてボイラにより加熱することで製造されていた。 2. Description of the Related Art Conventionally, in various production factories, for example, factories that produce and process foods, pharmaceutical facilities, etc., hot water is used for washing raw materials and containers. Such hot water was drained after being heat-exchanged to utilize the residual heat. Further, such hot water has been manufactured by heating water newly received from a water supply or the like with a boiler using fuel such as gas.

また、環境保護の観点から、例えば、蒸気式レトルト装置より排水される温水を熱交換器により充填液と熱交換した後、密閉式クーリングタワー及び冷水チラーにより冷却し、再び蒸気式レトルト装置の給水として再利用するシステムが提案されている(特許文献1参照)。 Further, from the viewpoint of environmental protection, for example, after the hot water discharged from the steam type retort device is heat-exchanged with the filling liquid by the heat exchanger, it is cooled by the closed cooling tower and the cold water chiller, and again used as water supply for the steam type retort device. A system for reuse has been proposed (see Patent Document 1).

また、生産施設から排出され、回収された排水を利用して、所望の温水を供給するシステムが提案されている(特許文献2参照)。かかる排水利用システムは、UF膜処理システム、処理水槽、熱回収用熱交換器、及び熱回収ヒートポンプを備え、UF膜処理システムから供給される処理水が、処理水槽、熱回収用熱交換器、熱回収ヒートポンプを順に経由して、温水となって洗浄設備へ供給されるようになっている。すなわち、かかる排水利用システムでは、UF膜処理システムにより排水を浄化処理して洗浄設備で再利用する一方、空調システムの熱交換器と組み合わせて、UF膜処理システムに導入される排水が温水の場合には温水から熱回収をしてUF膜処理システムに導入し、また、洗浄設備で温水を利用する場合には、UF膜処理システムで浄化処理した後、空調システムの排熱を利用して昇温して洗浄設備で再利用するものである。 In addition, a system has been proposed in which desired hot water is supplied by utilizing the wastewater discharged and collected from the production facility (see Patent Document 2). The wastewater utilization system includes a UF membrane treatment system, a treated water tank, a heat recovery heat exchanger, and a heat recovery heat pump, and the treated water supplied from the UF membrane processing system is a treated water tank, a heat recovery heat exchanger, It is designed to be supplied to the cleaning equipment as hot water via the heat recovery heat pump in order. In other words, in such a wastewater utilization system, while the wastewater is purified by the UF membrane treatment system and reused in the cleaning equipment, when the wastewater introduced into the UF membrane treatment system is hot water in combination with the heat exchanger of the air conditioning system. For recovering heat from hot water and introducing it into the UF membrane treatment system, and when using hot water in the cleaning equipment, after purifying with the UF membrane treatment system, use the exhaust heat of the air conditioning system to raise the temperature. It is heated and reused in cleaning equipment.

特開平5−260940号公報JP-A-5-260940 特開2015−117909号公報JP, 2015-117909, A

しかしながら、何れにしても、温水から熱回収を行うシステムと、排水を再利用するシステムとが組み合わされているものであり、熱回収のロスは避けられないものであった。 However, in any case, the system that recovers heat from hot water and the system that reuses waste water are combined, and loss of heat recovery is unavoidable.

本発明はこのような事情に鑑み、生産設備からのプロセス水、洗浄水などの温水を有効利用するシステムであって、熱回収率を高め、排水も有効利用する温水回収システムを提供することを課題とする。 In view of such circumstances, the present invention provides a system for effectively using hot water such as process water and washing water from a production facility, which has a high heat recovery rate and also effectively uses drainage. It is an issue.

前記課題を解決する本発明の第1の態様は、製造ラインから排出される温排水であって、食品を生産、加工する工場又は製薬設備からの蒸発凝縮水及び洗浄用リンス水から選択される少なくとも一方である75℃〜90℃の温排水を一次ろ過して前処理する一次ろ過設備を含む前処理装置と、前記前処理装置で前処理した前処理水をろ過処理する、マイクロフィルトレーション膜(MF)及び限外ろ過膜(UF)の少なくとも一方を用いた膜処理装置と、前記膜処理装置で膜処理された膜処理水であって25℃〜85℃の処理水を処理する、耐熱逆浸透膜(RO)を用いたRO処理装置とを具備し、前記RO処理装置で処理したRO処理水を前記製造ラインに送液する送液ラインを具備することを特徴とする温水回収システムにある。 A first aspect of the present invention which solves the above-mentioned problems is hot wastewater discharged from a production line, which is selected from evaporated condensed water and washing rinse water from a factory or a pharmaceutical facility that produces and processes food. A pretreatment device including a primary filtration facility for primary treatment of at least one of 75°C to 90°C warm wastewater by prefiltering, and a microfiltration for treating the pretreated water pretreated by the pretreatment device. A membrane treatment apparatus using at least one of a membrane (MF) and an ultrafiltration membrane (UF), and membrane-treated water that has been membrane-treated by the membrane treatment apparatus and is treated at 25°C to 85°C. An RO treatment apparatus using a heat resistant reverse osmosis membrane (RO), and a liquid feed line for feeding the RO treated water treated by the RO treatment apparatus to the production line. It is in.

かかる態様では、従来、熱回収が十分に行えなかった温排水を、必要以上に温度を低下させることなく、清浄化した状態で回収できるので、加熱設備でのエネルギー付加が省略又は著しく低減でき、また、温排水を製造用水として再利用できる。これにより、昇温用のエネルギーや原水の使用量を削減するとともに、排水処理費や下水放流費の削減ができる。また、蒸発凝縮水や洗浄用リンスを有効利用でき、昇温用のエネルギーや原水の使用量を削減するとともに、排水処理費や下水放流費の削減ができる。 In such an aspect, conventionally, the hot wastewater that could not sufficiently recover heat can be recovered in a cleaned state without lowering the temperature more than necessary, so that energy addition in the heating equipment can be omitted or significantly reduced, In addition, warm waste water can be reused as production water. As a result, it is possible to reduce the amount of energy for raising the temperature and the amount of raw water used, as well as the wastewater treatment cost and the sewage discharge cost. Further, evaporative condensed water and a rinse for cleaning can be effectively used, so that it is possible to reduce the amount of energy for raising the temperature and the amount of raw water used, and to reduce the wastewater treatment cost and the sewage discharge cost.

ここで、前記送液ラインの途中には、RO処理水を加温する加熱設備を具備するのが好ましい。これによれば、再利用する際の最適な温度の製造用水を得ることができる。 Here, it is preferable to provide a heating facility for heating the RO-treated water in the middle of the liquid sending line. According to this, it is possible to obtain the production water at the optimum temperature for reuse.

また、前記耐熱逆浸透膜(RO)が、スパイラル型合成高分子製の耐熱RO膜であることが好ましい Further, the heat resistant reverse osmosis membrane (RO) is preferably a heat resistant RO membrane made of a spiral type synthetic polymer .

本発明の一実施形態の温水回収システムの構成を示す説明図である。It is an explanatory view showing composition of a warm water recovery system of one embodiment of the present invention.

以下、実施形態に基づいて、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail based on embodiments.

本実施形態の温水回収システムは、製造、洗浄プロセス、すなわち、生産設備1から排出される比較的汚染度の低い温排水、例えば、蒸発凝縮水、洗浄用リンス水等を一時的に蓄える回収水タンク2、回収水タンク2に蓄えた温排水を処理する、一次ろ過設備3と、一次ろ過設備3でろ過されたろ過水を一時的に蓄える一次ろ過水タンク4と、一次ろ過水タンク4の一次ろ過水を処理するMF(精密ろ過)設備又はUF(限外ろ過)設備からなるMF/UF設備5と、MF/UF設備5で処理した処理水を一時的に蓄える処理水タンク6と、処理水タンク6の処理水を処理するRO(逆浸透)ろ過設備7と、ROろ過設備7で処理した処理水を必要に応じて加温するボイラー、ヒーターなどの加熱設備8とを具備する。 The hot water recovery system according to the present embodiment is a manufacturing/cleaning process, that is, recovered water that temporarily stores warm wastewater discharged from the production facility 1 and having a relatively low degree of pollution, such as evaporative condensed water and rinse water for cleaning. Of the primary filtration equipment 3 for treating the warm wastewater stored in the tank 2 and the recovered water tank 2, the primary filtration water tank 4 for temporarily storing the filtered water filtered by the primary filtration equipment 3, and the primary filtration water tank 4. MF/UF equipment 5 comprising MF (microfiltration) equipment or UF (ultrafiltration) equipment for treating the primary filtered water, and treated water tank 6 for temporarily storing the treated water treated by the MF/UF equipment 5. An RO (reverse osmosis) filtration facility 7 for treating the treated water in the treated water tank 6 and a heating facility 8 such as a boiler or a heater for heating the treated water treated by the RO filtration facility 7 as necessary are provided.

ここで、一次ろ過設備3は、通常のろ過設備であり、異物、不純物を除去するためのものである。 Here, the primary filtration equipment 3 is an ordinary filtration equipment for removing foreign matters and impurities.

MF/UF設備5は、MF設備又はUF設備からなり、MF設備は、MF膜(精密濾過膜)を具備するろ過設備である。MF膜の孔径は、50nm〜1μm程度である。また、UF設備は、UF膜(限外濾過膜)を具備するろ過設備である。UF膜の孔径は、1nm〜50nm程度である。 The MF/UF equipment 5 is composed of MF equipment or UF equipment, and the MF equipment is a filtration equipment equipped with an MF membrane (microfiltration membrane). The pore size of the MF film is about 50 nm to 1 μm. The UF equipment is a filtration equipment equipped with a UF membrane (ultrafiltration membrane). The pore diameter of the UF membrane is about 1 nm to 50 nm.

ROろ過設備7は、耐熱RO膜(逆浸透膜)を具備するろ過設備である。耐熱RO膜の孔径は、1nm以下程度であり、イオンや塩類などの阻止率が90%以上と高いものである。本実施形態では、RO膜の中でも耐熱RO膜であり、約85℃の処理水を処理することができるものであり、例えば、スパイラル型合成高分子製の耐熱RO膜である。 The RO filtration equipment 7 is a filtration equipment equipped with a heat resistant RO membrane (reverse osmosis membrane). The pore diameter of the heat-resistant RO membrane is about 1 nm or less, and the rejection rate of ions and salts is 90% or more, which is high. In the present embodiment, the RO film is a heat resistant RO film that can treat treated water at about 85° C., for example, a heat resistant RO film made of spiral synthetic polymer.

かかる耐熱RO膜は、25℃〜75℃で安定した処理を行うことができ、85℃程度の温水を送液しても処理可能なものである。 Such a heat-resistant RO membrane can be stably treated at 25°C to 75°C, and can be treated even by sending hot water of about 85°C.

よって、一次ろ過設備3、MF/UF設備5での温度降下を考慮すると、75℃〜90℃の温排水を一次ろ過設備3に送液することが可能である。 Therefore, considering the temperature drop in the primary filtration equipment 3 and the MF/UF equipment 5, it is possible to send the hot wastewater of 75°C to 90°C to the primary filtration equipment 3.

ここで、回収水タンク2と一次ろ過設備3との間には、回収水タンク2の温排水を一次ろ過設備3に送液するポンプ11が配置され、また、一次ろ過水タンク4とMF/UF設備5との間には、一次ろ過水タンク4の処理液をMF/UF設備5へ送液するポンプ12が配置されている。
また、MF/UF設備5の処理液を一時的に蓄える処理水タンク6とROろ過設備7との間には、処理水タンク6の処理液をROろ過設備7に送液するポンプ13が配置されている。
Here, between the recovered water tank 2 and the primary filtration equipment 3, a pump 11 for delivering the warm waste water of the recovered water tank 2 to the primary filtration equipment 3 is arranged, and the primary filtered water tank 4 and the MF/ Between the UF equipment 5 and the UF equipment 5, a pump 12 for delivering the treatment liquid in the primary filtered water tank 4 to the MF/UF equipment 5 is arranged.
Further, between the treated water tank 6 for temporarily storing the treated liquid of the MF/UF equipment 5 and the RO filtration equipment 7, a pump 13 for delivering the treated liquid of the treated water tank 6 to the RO filtration equipment 7 is arranged. Has been done.

ROろ過設備7は、上述した通り、スパイラル型の耐熱RO膜を備えたクロスフロータイプのろ過装置であり、処理液は、ボイラー、ヒーターなどの加熱設備8に送られる。 As described above, the RO filtration equipment 7 is a cross-flow type filtration equipment provided with a spiral heat resistant RO membrane, and the treatment liquid is sent to the heating equipment 8 such as a boiler or a heater.

加熱設備8は、一次ろ過設備3、MF/UF設備5、及びROろ過設備7により、清浄化された温排水を、必要に応じて加熱処理して、生産設備1に送液するものである。加熱設備8で加熱するかどうか、又はどの程度の温度まで加熱するかは、次の生産設備1での用途により決定されるものである。 The heating equipment 8 heat-treats the hot wastewater purified by the primary filtration equipment 3, the MF/UF equipment 5, and the RO filtration equipment 7 as needed, and sends it to the production equipment 1. .. Whether or not to heat the heating equipment 8 or to what temperature the heating equipment 8 is to be heated is determined by the application in the next production equipment 1.

しかしながら、従来、熱回収が十分に行えなかった温排水を、必要以上に温度を低下させることなく、清浄化した状態で回収できるので、加熱設備8でのエネルギー付加が省略又は著しく低減でき、また、温排水を製造用水として再利用できる。 However, since the hot wastewater, which has not been able to sufficiently recover heat in the past, can be recovered in a cleaned state without lowering the temperature more than necessary, energy addition in the heating equipment 8 can be omitted or significantly reduced, and The warm waste water can be reused as production water.

これにより、昇温用のエネルギーや原水の使用量を削減するとともに、排水処理費や下水放流費の削減ができるという効果を奏する。 As a result, it is possible to reduce the amount of energy for raising the temperature and the amount of raw water used, as well as the wastewater treatment cost and the sewage discharge cost.

なお、本発明は、上述した実施形態に限定されず、例えば、ROろ過設備7から生産設備1への送液パイプの途中に設けられた加熱設備8は、必ずしも設ける必要はない。また、MF/UF設備5は、クロスフロータイプを例示したが、これに限定されるものではない。 The present invention is not limited to the above-described embodiment, and for example, the heating equipment 8 provided in the middle of the liquid supply pipe from the RO filtration equipment 7 to the production equipment 1 does not necessarily have to be provided. Further, the MF/UF equipment 5 is exemplified as a cross-flow type, but is not limited to this.

図1に示す温水回収システムにおいて、温度60℃の温排水を20m/hrで処理した場合、24時間、360日稼働として、エネルギー削減効果を試算したところ、以下のようになった。
エネルギー削減効果・・・ 99,983,886円/年
用水コスト削減効果・・・ 4,700,160円/年
排水処理コスト削減効果・・・ 11,975,040円/年
トータル削減効果・・・ 110,959,086円/年
In the hot water recovery system shown in FIG. 1, when the hot waste water having a temperature of 60° C. was treated at 20 m 3 /hr, the energy saving effect was calculated as a 24-hour operation for 360 days, and the results were as follows.
Energy reduction effect: 99,983,886 yen/year Water cost reduction effect: 4,700,160 yen/year Wastewater treatment cost reduction effect: 11,975,040 yen/year Total reduction effect...・110,959,086 yen/year

このように、温排水を温水のまま再利用する本発明の温水回収システムでは、温排水をワンパスで使い捨てする場合と比較して、トータル1.1億円/年のコスト削減効果があることが判った。これは、排熱だけを回収する場合と比較しても大幅なコスト削減になることが明らかである。
また、用水を加熱するためのエネルギーも大幅に削減され、削減されたエネルギーを製造する際に発生するCO量は少なく見積もっても年間約2,200トンになることが判った。
As described above, the hot water recovery system of the present invention that reuses the hot waste water as hot water has a total cost reduction effect of 110 million yen/year as compared with the case where the hot waste water is disposable by one pass. understood. It is clear that this is a significant cost reduction compared to the case of recovering only exhaust heat.
It was also found that the energy for heating the water was significantly reduced, and the amount of CO 2 generated when producing the reduced energy was estimated to be about 2,200 tons per year even if estimated to be small.

1・・・生産設備
3・・・一次ろ過設備
5・・・MF/UF設備
7・・・RO設備
8・・・加熱設備
1...Production equipment 3...Primary filtration equipment 5...MF/UF equipment 7...RO equipment 8...Heating equipment

Claims (3)

製造ラインから排出される温排水であって、食品を生産、加工する工場又は製薬設備からの蒸発凝縮水及び洗浄用リンス水から選択される少なくとも一方である75℃〜90℃の温排水を一次ろ過して前処理する一次ろ過設備を含む前処理装置と、前記前処理装置で前処理した前処理水をろ過処理する、マイクロフィルトレーション膜(MF)及び限外ろ過膜(UF)の少なくとも一方を用いた膜処理装置と、前記膜処理装置で膜処理された膜処理水であって25℃〜85℃の処理水を処理する、耐熱逆浸透膜(RO)を用いたRO処理装置とを具備し、前記RO処理装置で処理したRO処理水を前記製造ラインに送液する送液ラインを具備することを特徴とする温水回収システム。 A warm waste water discharged from the production line, production of food, one processing evaporation condensate and thermal discharge of at least one selected from cleaning rinse water 75 ° C. to 90 ° C. from the factory or pharmaceutical amenities order At least a pretreatment device including a primary filtration facility for performing filtration and pretreatment, and a microfiltration membrane (MF) and an ultrafiltration membrane (UF) for performing filtration treatment on the pretreated water pretreated by the pretreatment device. A membrane treatment apparatus using one, and an RO treatment apparatus using a heat-resistant reverse osmosis membrane (RO) that treats membrane-treated water that has been membrane-treated by the membrane treatment apparatus at 25° C. to 85° C. A hot water recovery system comprising: a liquid feed line for feeding RO treated water treated by the RO treatment device to the production line. 前記送液ラインの途中には、RO処理水を加温する加熱設備を具備することを特徴とする請求項1記載の温水回収システム。 The hot water recovery system according to claim 1, wherein heating equipment for heating the RO-treated water is provided in the middle of the liquid sending line. 前記耐熱逆浸透膜(RO)が、スパイラル型合成高分子製の耐熱RO膜であることを特徴とする請求項1又は2記載の温水回収システム。 The hot water recovery system according to claim 1 or 2, wherein the heat resistant reverse osmosis membrane (RO) is a heat resistant RO membrane made of a spiral type synthetic polymer.
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