[특허]Aerobic wastewater treatment with alkalinity control

Aerobic wastewater treatment with alkalinity control 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C02F-003/12
출원번호	US-0479150 (1990-02-09)
발명자 / 주소	Davis H. Forbes (Tallevast FL) Harshman James P. (Tallevast FL)
출원인 / 주소	Davis Water & Waste Industries, Inc. (Tallevast FL 02)
인용정보	피인용 횟수 : 39 인용 특허 : 2

초록 ▼

Aerobic wastewater treatment processes are controlled utilizing alkalinity measurements. A base line of alkalinity is determined by measuring the alkalinity profile of the influent to the aerobic wastewater treatment process. The alkalinity of the wastewater is sensed at a number of different points in the aerobic wastewater treatment process, such as at a clarifier effluent and sludge exit, aeration zone, and aerobic digester effluent. When the sensed alkalinity at any given point is above a predetermined amount over base line alkalinity, the air supply is increased and/or the concentration of microbes and food is reduced (as by increasing the sludge withdrawal rate from a clarifier) until the sensed alkaline level is stablized. When the sensed alkalinity is below a predetermined amount under base line, the air supply is decreased and/or the concentration of feed and microbes increased (as by reducing or terminating sludge withdrawal from a clarifier) until the sensed alkalinity level is stabilized. Anaerobic odors are eliminated, plant operation and efficiency is improved, settling is improved, there is enhanced removal from the secondary clarifier, and solids carryover is reduced increasing the quality of effluent from the clarifier.

대표청구항 ▼

In the aerobic treatment of wastewater in which oxygen is supplied to microbes and feed, utilizing a clarifier, aerobic zone, and aerobic digester, a method of monitoring alkalinity within a predetermined range so as to maintain the pH of the wastewater between about 6.5-8.0 during treatment, by practicing the steps of: (a) sensing the alkalinity of the wastewater at a plurality of points in the aerobic treatment of wastewater, including at each of the clarifier, aerobic zone, and aerobic digester; and (b) adjusting the alkalinity adjacent the plurality of points so that it is within about 100 mg of CaCO3/L of a desired value by changing the rate of oxygen supply and/or the concentration of microbes and feed, so as to control alkalinity to maintain pH within the range of about 6.5-8.0 without the addition of chemicals or additives.

이 특허에 인용된 특허 (2)

King ; Earle Cochran, Apparatus for increasing the pH of waste water.
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Paz Jacob D. (33 Riverside Dr. New York NY 10023), Method for continuously monitoring and controlling alkalinity for environmental purposes using a pCO₂ prob.
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Aerobic wastewater treatment with alkalinity control 원문보기

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Aerobic wastewater treatment with alkalinity control 원문보기

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