WATER TREATMENT METHOD AND SYSTEM

• Main Authors: NAKAHARA SADAHITO, SAWADA SHIGEKI
• Format: Patent
• Language: English; Japanese
• Published: 16.11.2017
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To provide a water treatment method and system capable of drawing a nitrifying bacteria carrying carrier from a nitrification tank while sufficiently suppressing a decrease in nitrification efficiency.SOLUTION: In a water treatment method, ammonia nitrogen-containing water to be treated is treated to obtain first treated water in a first nitrification tank 10 into which a nitrifying bacteria carrying carrier 200 has been charged in a drawable state, the first treated water is treated to obtain second treated water in a second nitrification tank 20 into which the nitrifying bacteria carrying carrier 200 has been charged, the concentration of ammonia or ammonia nitrogen in the second treated water is measured, and when drawing the nitrifying bacteria carrying carrier 200 from the first nitrification tank, 50 vol% or less of the nitrifying bacteria carrying carrier 200 charged in the first nitrification tank 10 is drawn from the first nitrification tank 10 and at the same time the first nitrification tank 10 is replenished with a carrier not carrying nitrifying bacteria, in a state where the ammonia concentration or the ammonia nitrogen concentration has been kept at or below a preset threshold value for a preset time or longer.SELECTED DRAWING: Figure 1 【課題】硝化効率の低下を十分に抑えつつ、硝化菌担持担体を硝化槽から抜き出すことができる水処理方法および水処理システムを提供する。【解決手段】硝化菌担持担体２００が抜き出し可能な状態で充填された第１の硝化槽１０においてアンモニア性窒素を含む被処理水を処理して第１の処理水とし；硝化菌担持担体２００が充填された第２の硝化槽２０において第１の処理水を処理して第２の処理水とし；第２の処理水のアンモニア濃度またはアンモニア性窒素濃度を測定し；第１の硝化槽から硝化菌担持担体２００を抜き出すときには、アンモニア濃度またはアンモニア性窒素濃度があらかじめ設定された閾値以下になった状態があらかじめ設定された時間以上持続した状態において、第１の硝化槽１０に充填された硝化菌担持担体２００の５０体積％以下を第１の硝化槽１０から抜き出すとともに、第１の硝化槽１０に硝化菌が担持されていない担体を補充する水処理方法。【選択図】図１