Recycled tailwater leads to better breeding in Hebei

SHIJIAZHUANG — Tailwater is not wastewater, as a major aquaculture city in Hebei province has discovered.

"Since the middle of January, we've harvested up to 2,500 kilograms of prawns every day. Recycled water played an important role in that," said Yin Xiangguang, head of an aquaculture farm in Tangshan's Laoting county, which is promoting the greening of the industry.

At the entrance to the aquaculture farm, a water wheel-like roller spins without stopping. Tailwater — water below a hydraulic structure such as a dam or spillway — flows into the roller and through a microfilter, where large particles of bait, fish and prawn feces are filtered out.