The impact of low temperature on sewage treatment and treatment methods
The impact of low temperature on sewage treatment and treatment methods
01 The impact of lowering temperature on the process parameters of sewage treatment plants
Decreased sludge activity: Low temperature will significantly inhibit the metabolic activity of microorganisms, resulting in poor sludge settling performance, slowed biochemical reaction rates, and reduced organic matter removal efficiency.
Changes in dissolved oxygen demand: Due to the weakening of microbial metabolic activity, the demand for dissolved oxygen may be relatively reduced, but in order to maintain a certain treatment effect, sufficient aeration still needs to be ensured to increase microbial activity in the system.
Increase in sludge age: Under low temperature conditions, the growth and reproduction rate of microorganisms decreases, which prolongs the sludge age (SRT), which may lead to sludge aging and further affect treatment efficiency.
Changes in nutrient balance: Microbial metabolism is slow, and the demand ratio for nitrogen, phosphorus and other nutrients may be adjusted.
02 Methods for restoring sludge activity and optimizing process parameters
Aeration control: Appropriately increase aeration time and intensity to ensure sufficient dissolved oxygen in the biological pool, which helps to improve microbial activity. At the same time, make dynamic adjustments based on the measured dissolved oxygen data to avoid excessive aeration.
Temperature control: If conditions permit, external heating measures (such as steam, hot water circulation, etc.) can be used to appropriately increase the water temperature of the biological pool to restore microbial activity.
Nutrient supplementation and adjustment: Adjust the proportion and dosage of carbon source, nitrogen source and phosphorus source according to the actual operation situation to provide sufficient energy source for microorganisms and promote their activity at low temperatures.
Sludge management: Appropriately shorten the sludge age, control the sludge concentration by sludge discharge, introduce fresh sludge or microbial populations that have adapted to low temperature environments to improve overall activity.
Operation mode adjustment: For example, adopt stage aeration, intermittent operation, etc. to create environmental conditions that are conducive to microbial adaptation to low temperatures.
The above points need to be comprehensively analyzed in combination with actual conditions to formulate targeted debugging plans.
