Method for controlling or alleviating membrane pollution of membrane bioreactor by regulating operation condition

Abstract

The invention provides a method for adjusting the operation condition to control or mitigate pollution of the membrane bioreactor, which relates to a method for controlling or mitigating the membrane pollution, aiming at solving the problems that using the aerobic particle sludge inoculation to control the membrane pollution dose not conform to the initial purpose of inventing the membrane bioreactor which influences the utilization efficiency of the membrane bioreactor. In the aerobic membrane bioreactor, the invention ensures that the dissolved oxygen concentration is 3-4mg / L; the sludge concentration 8000-10000mg / L; the hydraulic retention time is 7-9 hours; the sludge retention time is 140-160d. Microorganism is added to the anaerobic membrane bioreactor, in which the sludge temperature is controlled to range from 20 to 30 DEG C and the pH value is controlled at 6.3-7.7. The invention controls from reducing the microorganism species of the secretion membrane pollutants. The reduction of the membrane flux of 100 days is 50 percent of the contraction and the times of membrane-clearing are reduced by 70 percent. Compared with the contraction, the invention saves the operation cost more than 70 percent, thus improving the sewage quantity of 150 Ld<-1>.

Description

technical field [0001] The invention relates to a method for controlling or slowing down membrane fouling of a membrane bioreactor. Background technique [0002] Membrane bioreactor is a new type of high-efficiency water treatment process that combines biodegradation and membrane high-efficiency separation technology. It first appeared in North America, and was subsequently applied in Japan and Europe. It entered my country in the late 1990s. The process has the advantages of high treatment efficiency, no particulate matter in the effluent, small footprint, and remote monitoring and control. The traditional activated sludge process uses a gravity settling tank for mud-water separation. Due to improper operation and management, sludge swelling and foaming often occur, resulting in difficulty in mud-water separation and deterioration of effluent quality. On the contrary, sewage treatment plants using membrane bioreactor technology are hardly affected by sludge bulking and foa...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the method of inoculating aerobic granular sludge to inhibit membrane fouling does not conform to the original idea of ​​inventing the membrane bioreactor. If the microorganisms in the reactor mainly exist as granular sludge, these granular sludge can easily pass through natural sedimentation. Separation of mud and water, then, the advantages of the membrane bioreactor itself cannot be fully utilized, and to some extent also affects the utilization efficiency of the membrane bioreactor, providing a way to adjust the operating conditions to control or slow down the membrane bioreactor Methods of Reactor Membrane Fouling