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Micro-oxygen batch activated sludge process control method for lignite upgrading wastewater

A technology of activated sludge and process control, which is applied in water treatment parameter control, water/sludge/sewage treatment, aerobic and anaerobic process treatment, etc. It can solve the problems of unstable effluent quality and high energy consumption

Inactive Publication Date: 2016-11-23
JILIN JIANZHU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of unstable effluent water quality and high energy consumption of the micro-oxygen intermittent activated sludge system due to large changes in the composition, water quality, and water volume of lignite upgrading wastewater, and to develop a set of micro-oxygen Batch-type activated sludge reactor process control system, the system takes the ORP in the reactor as the control variable, adopts the feedback control structure, and adjusts the blower automatic control system to open and close the blower to change the operation stage

Method used

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specific Embodiment approach 1

[0012] Specific implementation mode 1: This implementation mode is a micro-oxygen batch activated sludge reactor process control system for lignite upgrading wastewater, which is specifically completed according to the following steps:

[0013] ①Select BOD 5Concentration is 500~600mg / L, COD concentration is 2800~3300mg / L, ammonia nitrogen concentration is 70~90mg / L, SS concentration is 70~100mg / L, volatile phenol concentration is 90~110mg / L, cyanide concentration is 0.75 ~1.25mg / L lignite upgrading wastewater is used as industrial wastewater to be treated.

[0014] ②Construct the automatic control system of micro-oxygen batch activated sludge reactor. The detector of the control system is an ORP online measuring instrument, which is respectively installed at 20cm from the bottom of the micro-oxygen batch activated sludge reactor, the middle depth of the reactor, and 20cm below the water surface; the controller is a PLC controller installed in the computer; The terminal execu...

specific Embodiment approach 2

[0017] Embodiment 2. The difference between this embodiment and Embodiment 1 is that the ORP setting value of the PLC controller in step ② is 90mV, and the others are the same as Embodiment 1.

specific Embodiment approach 3

[0018] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the automatic control system in the step 2. adopts the control strategy that the curve of ORP changes with time enters the plateau period: in the reaction process, read every 3min The information of the 3 ORP measuring instruments is transmitted to the data acquisition card of the computer for storage and the average value is calculated, and the value is converted into a digital signal, which is input to the PLC controller to calculate the rising rate of the ORP value. When the value is less than 0.3 When ~1.0mV / min is maintained for 10-30min, the output signal of the PLC controller is transmitted to the blower automatic control system, and the blower is stopped through the blower automatic control system. Others are the same as the specific embodiment 1 or 2.

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Abstract

The invention provides a control system for a micro-aerobic batch activated sludge process of brown coal upgrading wastewater and relates to a control method for an activated sludge process. The control method is used for solving the problem of disturbance to a micro-aerobic batch activated sludge system due to the change of the brown coal upgrading wastewater in composition, water quality and water quantity. The control method mainly comprises the following steps: selecting wastewater to be treated; establishing an automatic control system for a micro-aerobic batch activated sludge reactor, and adopting three strategies to control the reactor, wherein the first one is a control strategy that ORP set value is within the range of 80-100mV, the second one is a curve characteristic point control strategy that the ORP rise rate is lower than 0.3-1.0mV / min and kept for 10-30 minutes, and the third one is a first-order derivative characteristic point control strategy that the first-order derivative rise rate of ORP to time is lower than 0.01-0.05mV / min and kept for 10-30 minutes; running the reactor under the conditions of sludge load of 0.12-0.48kg COD (kgMLSS.d), sludge concentration of 6-7g / L, drainage ratio of 0.6, reaction time of 6-18 hours and superficial gas velocity of 0.09-0.15cm / s; and controlling the micro-aerobic batch activated sludge reactor by use of the process control system to enable the reactor to work under stable conditions.

Description

technical field [0001] The invention relates to the operation control of the sequencing batch activated sludge process, in particular to the process control method of the sequenced batch activated sludge process. Background technique [0002] As a kind of coal, lignite is rich in resources, accounting for 17.16% of the country's coal reserves, mainly concentrated in Inner Mongolia, Northeast China, Yunnan and other regions. The degree of coalification of lignite is between peat and bituminous coal, with high moisture content, low calorific value, easy weathering and spontaneous combustion, which is not conducive to long-distance transportation and storage. However, the main market of my country's petrochemical and energy products is in the east, and mining, production and market are separated, and long-distance transportation is inevitable. In addition, the thermal efficiency of direct combustion is low, and the emission of greenhouse gases is large, and lignite liquefactio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
CPCC02F3/006C02F3/302C02F2209/005
Inventor 王晓玲高尚宋铁红韩相奎殷宝勇李静文
Owner JILIN JIANZHU UNIVERSITY
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