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China

HuaXin, Shanghai

The city HuaXin is located in the greater Shanghai area. Cities in this region are often referred to as the “Venice of the East” because the extremely densely populated estuary of the Yangtze River is traversed by many streams.

Having no adequate infrastructure for their disposal of waste (including wastewater), the arising sewage is often diverted and transported into the rivers. According to that, the waters are mostly polluted and contaminated.
The Department of the Environment of Shanghai invited us to submit a draft of a constructed wetland. As there was not very much space available in the populous city, we suggested one could build a sewage treatment plant in the channel where the sewage is drained off.

First of all, a preliminary draft was sketched. At a later date, the project was realised.
The constructed wetland is designed for 80,000 litres of wastewater per day. The sewage comes from a nearby indoor market and several apartment blocks.

The untreated sewage from the apartment buildings flows in an open channel, HuaXin, Shanghai, China

Installation of the waterproofing and sealing

Filter system in HuaXin

The cesspool where the untreated sewage once drained away is now home to a large constructed wetland

Technical College, Zhoushan

On the island of Zhoushan, south-east of Shanghai, a vertical flow (VF) wetland was built in a short construction period. It purifies the wastewater from 1,200 students. On the basis of its process stability, it does pretty well regarding its performance not only on school days but also during the holidays, when it is ‘underloaded’.

Technical college on the island Zhoushan, China

The constructed wetland in its 1st year of operation

The constructed wetland in its 2nd year of operation

Constructed wetlands can embellish an outdoor facility

Yangshan Deep Water Port

Despite limited floor area, a constructed wetland has already been proposed at the planning stage of the deep-water port in Shanghai in order to purify the wastewater from its offices.
The wastewater is cleaned by a vertical-flow soil filter and subsequently collected in a cistern. Aside from that, the purified water is exclusively reused for the toilet and the urinal flushing.

The modern deep-water port purifies its sewage with the help of constructed wetlands, Shanghai, China

A successful example of applied engineering ecology