Bottom line on sludge disposal safety in Shanghai

Sewage treatment is one of the "end battlefields" of epidemic prevention and control, and it is necessary to ensure the safety of sewage operators in the process as well as the safety of the disposed water quality and sludge to the environment without pollution. In the face of the obvious growth of sewage disposal volume, to ensure the safe disposal of sewage sludge has become a key factor. The reporter recently learned from Shanghai Environment Group Co., Ltd. that the group's water business unit is actively coordinating and optimising the configuration of facilities to enhance the effectiveness of safe disposal, in order to guard the end of the line of defence of environmental safety.

Promoting synergistic treatment of sewage and sludge

Shanghai Environmental Water's Zhuyuan First Wastewater Treatment Plantfilter pressThe treatment plant mainly undertakes the dry-flow sewage and combined sewage of Putuo, Changning, Jing'an, Zhabei and part of Baoshan, Huangpu, Hongkou, Yangpu, Pudong Waigaoqiao, etc., with a service area of 107 square kilometres, and a sewage treatment volume accounting for 1/6 of the total sewage volume of the urban area. qingpu sludge incineration plant is responsible for the disposal of sludge of 10 sewage treatment plants in qingpu district, and it is the largest volume of sludge disposal unit in qingpu district.

It is understood that, at present, the Shanghai Environment and Water Division has organised two units of materials, personnel and technical resources for mutual output, joint prevention and control of the epidemic, composed of horizontal synergy, cooperate with the "community", and the formation of a set of promotable, replicable, can draw on the experience of epidemic prevention and control.

"Organising joint prevention and control between the two sides can effectively achieve a 1+1>2 effect and ensure that theSludge Filter PressSewage disposal is unabated and more efficient." The relevant person in charge of the Shanghai Environment and Water Business Unit introduced that the first sewage treatment plant in Zhuyuan used its own nearly 21 years of operational experience to help the Qingpu sludge incineration plant to enhance the process of sewage disposal. Qingpu sludge incineration plant draws on the process experience of the first sewage treatment plant in Jhuyuan, in the sludge disposal of the whole process using self-unloading sludge intake, one-time lifting, semi-dry sludge vertical drop feed, the whole process of negative pressure control in the extraction of deodorant experience, and effectively eliminate the new crown of the pathway of the spread of viral aerosols.

Technological innovation reduces wastewater treatment risks

Strengthening the sewage treatment process control is also a heavy burden of the Shanghai Environmental Water Division's efforts in the direction of the reporter learned that they are through the "deep-water aeration + fine regulation + digital inspection" three new technologies to explore, and strive to minimise the impact of the epidemic risk.

First of all, give full play to the deep water aeration technology, the formation of sewage increment "pressure reducing valve". Since March 16, Shanghai started grid screening, the water division under the Zhuyuan first sewage treatment plant daily treatment capacity has been greatly increased, up to 1,456,600 cubic metres / day, higher than the design capacity of 32,4%, sewage treatment pressure doubled. The effective water depth of the aeration tank of Zhuyuan WWTP No.1 is about 10m, which is nearly 60% more than that of conventional WWTP. Through optimised operation, its oxygen transfer efficiency (OTEf) can reach more than 1,20% of conventional WWTP, which can effectively fight against the impact load of fluctuating water quantity and quality, and realise the stable, environmentally-friendly and standard-discharging of the excess wastewater during the prevention and control period of the epidemic.

Source: Environment Network