Study on the synchronous degritting and deodorization performance of fixed-point sand suction in aerated grit chamber of municipal sewage treatment plant
The reciprocating operation of the sand discharging machine in the municipal sewage aerated sand settling tank cause two problems:less sand output and odor release.To solve these problems,the performance of the alternative solutions was investigated.The sand removal was carried out by a fixed-point air sand suction and the follow-up movable sealing was replaced by a fixed deodorization sealing.The mathematical simulation method was used to evaluate the distance between air sand suction equipment and sealing property.The optimal simulation results were obtained as follows:the interval distance of the air lift components was 3 m,and the gap rate of the fixed seal was less than 1％.Then,a validation experiment was carried out in a municipal sewage treatment plant in North China.The results showed that the sand production capacity of the aeration grit chamber was increased to 0.0313 L·m-3(increased 67％),met the requirements of Water Supply and Drainage Design Manual,and the odor concentration in the room of aeration grit chamber was 16.5(reduced by 98％),the ammonia mass concentration was 0.059 mg·m-3(reduced by 63％),and the hydrogen sulfide mass concentration was below the detection limit(reduce by nearly 100％),met the requirements of DB11/2007-2022.The proposed optimal transformation design could achieve the target of synchronous degritting and deodorization.This study provides useful reference for the optimization and transformation of aeration grit chamber in municipal sewage treatment plants.
municipal sewageaeration grit chamberfixed-point sand suctionodor
万方数据
维普
