[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-0629622 (1990-12-18)
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 : 33 인용 특허 : 0

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 stabilized. 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 ▼

A method of controlling an aerobic wastewater treatment process, having an influent of wastewater to the process and an effluent of treated water from the process, comprising the steps of: (a) determining a base line of alkalinity by measuring the alkalinity profile of the influent wastewater to the aerobic wastewater treatment process; (b) sensing the alkalinity of the wastewater being treated at a plurality of different points in the aerobic wastewater treatment process; (c) when the sensed alkalinity from step (b) is above a predetermined amount over base line alkalinity, and on the basis of the alkalinity sensing alone, independent of dissolved oxygen sensing, increasing air supply and/or reducing concentration of microbes and food until the sensed alkalinity level is within a predetermined amount over base line; and (d) when the sensed alkalinity from step (b) is below a predetermined amount under base line alkalinity, and on the basis of the alkalinity sensing alone, independent of dissolved oxygen sensing, decreasing air supply and/or increasing the concentration of food and microbes, until the sensed alkalinity level is within a predetermined amount under base line; (e) whereby efficient treatment of wastewater to produce treated effluent without the addition of outside alkalinity adjusting chemicals or additives is accomplished.

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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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