"Zero direct discharge of sewage" has achieved initial results. Zhejiang has launched the rainwater and sewage diversion 2.0 model.

Not long ago, the "Dayu Ding" award, which can be called the "Oscar" in the water management industry, was held in Zhejiang at a meeting on high-quality construction of beautiful Zhejiang and high-level promotion of "five water management" Awarded, let’s first take a look at the cities and counties that won the “Five Waters Co-management” work in Zhejiang Province in 2018.

Five water co-management mainly refers to sewage treatment, flood prevention, waterlogging drainage, water supply protection and water conservation. Since it was proposed in 2013, sewage treatment It has always ranked first in these five major aspects. In order to fight the tough battle of "co-management of sewage", the construction of "zero direct sewage discharge zone" has become its core carrier and main breakthrough. "Zero direct discharge of sewage" refers to the sewage generated in production, living and business activities, which is collected and treated before being discharged to prevent direct discharge of sewage into rivers. At present, many places have built "zero direct discharge of sewage areas".

Take Hangzhou, which has won the "Dayu Ding" title for three consecutive years, as an example. It launched the "Zero Direct Wastewater Discharge Zone" construction model 1.0 a few years ago and basically realized the "Sunny Day" "No drainage, no sewage on rainy days", last year Hangzhou launched the "Zero Direct Sewage Discharge Zone" construction 2.0 model, and the diversion of rainwater and sewage became the highlight of the transformation. In order to promote the construction requirements of "zero direct discharge of sewage area", Hangzhou changed the end of the wastewater to the source diversion, and in-depth renovation of the balcony of each household. It has completed the renovation of 196 living quarters, and is undergoing inspection and renovation. It is expected to reach " More than 80% of the towns and streets in the "zero direct discharge of sewage area" construction standards will be achieved, and by 2021 all counties and districts in the city will basically meet the construction standards.

Ningbo City has launched the creation of "Zero Direct Sewage Discharge Zone" in the whole province. The city has created it in four batches. According to the three categories of corporate sewage, urban domestic sewage and rural domestic sewage, the main focus is In the three aspects of rainwater and sewage pipe network mapping, sewage interception and management, and long-term supervision, we will carry out the construction of "zero direct sewage discharge areas" according to local conditions. It is reported thatAs of May, more than 70% of villages and towns have been established. This year, Ningbo plans to complete the construction of "zero direct sewage discharge areas" in Hangzhou Bay New Area, National High-tech Zone, Airport and Logistics Park by the end of the year. It is expected that by 2020, the entire region will achieve the goal of "no drainage on sunny days and no sewage on rainy days".

In practice, one of the pillars of "zero direct discharge of sewage" is sewage interception and management. There are three main construction units, namely industrial parks, living quarters and other types ( For example, catering, hotels, etc.), the focus and methods during construction are all different, so what are the specific measures?

Although Zhejiang Province has “zero sewage The construction of "direct discharge area" has achieved remarkable results, but its construction process is not accomplished overnight, and many problems that have arisen in engineering examples have to be paid attention to. For example, once the precipitation increases, the drainage pipes have no time to transport the sewage, and the sewage begins to overflow everywhere; the large-scale interception and drainage system is used, and the sewage interception effect becomes worse and worse; the main sewage pipe remains at a high level for a long time, resulting in a series of problems such as the overflow of sewage in the pipe. Therefore, it is necessary to design and plan reasonable sewage treatment and collection capacity construction. When constructing rainwater and sewage diversion projects, actual considerations must be made according to local conditions. In addition, drainage outlets must be inspected one by one, and renovation or additions must be carried out strictly according to classification to promote quality water environment management. promote.

　(Original title: "Zero direct discharge of sewage" has achieved initial results, Zhejiang has launched the rainwater and sewage diversion 2.0 model)