Ua kūkulu ʻia ʻo Qidong Municipal Sewage Treatment Plant i ka makahiki 2004. Ke hana nui nei ka ʻoihana i ka mālama ʻana i ka wai o ke kūlanakauhale.I loko o ka Qidong City Water Treatment Plant, ua hoʻohana maikaʻi ʻia kā mākou pH mika, ka mika oxygen dissolved a me nā mika wai ʻē aʻe i ke kaʻina hana hoʻomaʻamaʻa ʻana i ka wai hoʻoneʻe, e hoʻohui ana i ka ikaika i ke kūkulu ʻana i ke kaiapuni o ke kūlanakauhale.
