BIOLOGICAL TREATMENT METHOD AND BIOLOGICAL TREATMENT DEVICE

• Main Authors: ONO NORIAKI, FUKASE TETSURO, MATSUTANI NAOKI
• Format: Patent
• Language: English; Korean
• Published: 21.11.2016
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

전자 디바이스 제조 공정에서 배출되는 유기성 배수의 생물 처리에 있어서의 중화를 효율적으로 실시함으로써, 종래의 생물 처리에서 과잉으로 사용되고 있던 중화제의 사용량을 저감하고, 또한 이어지는 후단의 응집 공정에 있어서의 무기 응집제의 사용량이나, RO 막 분리, 이온 교환 처리에 있어서의 염류 부하를 저감한다. 최종단의 호기성 생물 처리조를 포함하여 적어도 2 조의 호기성 생물 처리조를 포함하는 2 이상의 생물 처리조에, 전자 디바이스 제조 공정에서 배출되는 유기성 배수를 순차로 통수시켜 생물 처리할 때에, 최종단의 생물 처리조 내 액의 M-알칼리도가 50 ㎎/ℓ as CaCO이하로 유지되도록, 최종단의 생물 처리조 이외의 생물 처리조에 있어서 중화제를 첨가한다. Provided is a biological treatment method and an apparatus that allow organic wastewater from a manufacturing process of electronic devices to be neutralized efficiently during its biological treatment with a less neutralizer in contrast to excessive use thereof in the conventional biological treatment and thereby make it possible to reduce an amount of an inorganic coagulant used in the downstream coagulation step and to reduce salt loads in RO membrane separation and ion exchange treatment. Wastewater from a process of manufacturing electronic devices is passed sequentially through two or more biological treatment tanks that include at least two aerobic biological treatment tanks including the final-stage aerobic biological treatment tank while adding a neutralizer to the biological treatment tank or tanks except the final-stage biological treatment tank so that an M-alkalinity of the liquid in the final-stage biological treatment tank is maintained at not more than 50 mg/L as CaCO3.