The rainwater culverts and sewage sludge along the Hanjiang North Road in Fancheng District, Xiangyang City, Hubei Province are undergoing degradation.

Project Overview

The Xiangyang City Hanjiang North Road Pumping Station mainly drains rainwater from an area of approximately 10km², preventing urban waterlogging. However, due to incomplete rainwater and sewage separation in this area and many wrongly connected pipelines, a large amount of sewage flows into the rainwater pipes. On sunny days, approximately 40,000-50,000 cubic meters of sewage accumulate in the pipes, posing a risk of sewage entering the river every time it rains. The pump station has a pool area of 25m², an effective water depth of 8m, an effective volume of 200m², and an upstream inflow of 50,000m³/d. A 10kg ultra-nano gas-dissolved oxygenation system is used for oxygenation.

Current Situation

(1) The rainwater pipes are wrongly connected, resulting in high water levels even on sunny days, making it impossible to dredge the culverts or conduct subsequent pipeline surveys;

(2) The pumping station basically starts operating during moderate or heavy rain, discharging a large amount of sewage into the Dali Gougou River, resulting in unusually foul-smelling river water, causing numerous complaints from residents, making the issue prominent.

Solution

The ultra-nano gas-dissolved oxygenation system injects high-concentration dissolved oxygen into the bottom of the water body without producing visible bubbles, forming a stagnant oxygen layer at the bottom of the water body, greatly improving the water body's oxidation-reduction potential, improving the anaerobic environment of the water body, restoring aerobic microbial flora, and strengthening the degradation of organic matter. Especially in foul-smelling water bodies, it can achieve odor removal in 1 day, black water removal in 3 days, and carbon and nitrogen reduction in 7 days, and has been verified in many places.

Treatment Results

Results show that: 12 hours after the ultra-nano equipment was started, the foul smell and black color of the water in the pre-pool of the pumping station improved significantly, the odor disappeared, the black color gradually faded, and the water turned white. After 36 hours, the water transparency further improved, and after 48 hours, the water body remained good.

▼Left: During rain, the pumping station discharges a large amount of rainwater and sewage into the river; Right: The water in the pumping station is foul-smelling

▼ Comparative photos of water samples at different time periods before and after treatment