Original title: Environmental protection inspector: Guangdong Maoming’s centralized sewage collection rate is less than 40%, and a large amount of domestic sewage is directly discharged
On September 6, the Central Ecological Environmental Protection Inspection Team notified a batch of typical cases of inspectors. The inspectors pointed out that the water pollution control work in Maoming, Guangdong is not well advanced, the sewage pipe network construction is lagging, the pollution control facilities are not well managed, the problem of direct sewage discharge is prominent, and the water environment decline in quality.
In August 2021, a large amount of overflow occurred at the overflow outlet of the sewage interceptor culvert in the Xihe River, and the chemical oxygen demand and ammonia nitrogen concentration were 27.4 times and 15.3 times higher than the surface water class III standard, respectively.
In August 2021, a large amount of overflow occurred at the overflow outlet of the sewage interception box culvert in the Xihe River, and the chemical oxygen demand and ammonia nitrogen concentration exceeded the surface water Class III standard by 27.4 times and 15.3 times, respectively.
The inspector believes that Maoming City has insufficient understanding of the arduousness and urgency of water pollution control in Xiaodong River and Shuidong Bay, has not been placed in an important position, lacks systematic planning, and has insufficient pressure transmission; Maonan District, Dianbai District and Shuidongwan New Town The construction management committee lacks determination and tenacity, the construction of sewage pipe network is ineffective, and the operation and management are poor.
The inspection team stated that it will further investigate and verify the situation, and follow-up inspection work as required.
The construction of the pipe network is seriously lagging behind, and the city’s centralized sewage collection rate is only 34.5%
Since the “13th Five-Year Plan”, Maoming City has strengthened the construction of sewage pipe network, increased sewage treatment capacity, and made certain progress in sewage treatment. However, there is still a gap between the goal of improving environmental quality and the problem of imperfect pipe network is still outstanding.
The inspector found that a large amount of domestic sewage in Dianbai District of Maoming City was directly discharged, which affected the waters of Shuidong Bay; the water quality of Xiaodong River in Maonan District continued to decline. Maoming City was interviewed by the Guangdong Provincial Department of Ecology and Environment and notified by the Ministry of Ecology and Environment.
The centralized collection rate of sewage in Maoming is only 34.5%, which is less than half of the provincial average. There is a huge gap in the sewage pipe network, and a large amount of domestic sewage is directly discharged.
Maoming City, Dianbai and Maonan districts have insufficient determination and investment in pipe network construction. From 2018 to 2020, the city’s urban area will only build 45.7 kilometers, 31.9 kilometers and 27.5 kilometers of pipeline networks, respectively. The construction of the pipeline network in the Xicheng area, which is the key development in Maonan District, has been delayed, and it was not until the end of April this year that the construction of the 11.3 kilometers of sewage pipeline network that should be supported was started. So far, there are still 6.8 kilometers that have not been completed.
Affected by the delayed construction of sewage pipe network, the influent concentration and operating load of urban domestic sewage treatment plants have been low for a long time. During the on-site inspection by the inspection team, the influent chemical oxygen demand concentration of the first sewage treatment plant in the urban area and the Hexi sewage treatment plant were only 94 mg/liter and 81 mg/liter respectively. The problem of sewage overflow in rainy days caused by the undifferentiated rain and sewage is very prominent. Only in the urban area of Maonan District along the main stream of the Xiaodongjiang River, there are 10 rain-sewage combined overflow outlets that have rainy days overflow. The early inspection by the inspector team found that the overflow outlet of the Xihe interceptor culvert in the tributary mine discharged a large amount of black sewage on rainy days. The chemical oxygen demand and the ammonia nitrogen concentration were as high as 567 mg/L and 16.3 mg/L, respectively, exceeding the surface water Class III standard. 27.4 times and 15.3 times.
Pollution control facilities have frequent failures, often “small problems, major treatments, and long shutdowns”
Dianbaicheng District Water Purification Plant has frequent failures, often with “small problems, major treatments, and long shutdowns”. Since December 2020, due to the failure of the aeration system, the maintenance has taken more than 5 months, during which about 10,000 tons of sewage per day Drain the East Bay straight. The Shuidongwan New Town Sewage Treatment Plant with a daily processing capacity of 22,500 tons was completed in April 2019, but it was suspended for 27 months due to the disagreement on the change of the drainage direction. It was not resolved until the inspectors moved in. The inspection team spot-checked two rural sewage treatment facilities in Wuhe Village, Shuidongwan New City. One of them was “basking in the sun” because it was not powered on for a long time. After the inspection team pointed out the problem, the local government turned on the electricity overnight; another reason The pipe network is not matched and cannot be put into operation normally, and they are all reduced to furnishings.
There are 566 wrong, missed and mixed connection points in the sewage pipe network in the central urban area of Maoming, and 484 have not been rectified. The inspector also discovered that there were many sewage leakage points in the sewage pipe network along the Sengao River in Dianbai District, and the sewage was leaked for a long time. It was not blocked overnight until the inspection team pointed out the problem on the spot.
From April 2019 to July 2021, the Shuidongwan New Town Wastewater Treatment Plant was shut down for a long time.
Due to the damage of the sewage pipe network, a large amount of domestic sewage was accumulated in the Sengao River in the Dianbai District, which had already been intercepted and discharged directly into Shuidong Bay.Usually slow to act, temporarily hug
Xiaodongjiang’s governance is not systematic, and the problem of “treating headaches and feet and feet” is prominent. After the completion of the first phase of the 25,000 tons/day project of the Maonan District Sewage Treatment Plant, the project was “not full” for a long time, and the operating load was less than 60%. However, the university town area within the pollution receiving area lacked a sewage pipe network. The university’s self-built sewage treatment facilities are out of repair and idle, and about 8,000 tons of domestic sewage are directly discharged every day.
Maonan District did not pay enough attention to this. It was not until the first quarter of 2021 that the water quality dropped significantly. The completed 160,000 tons of domestic sewage will be sent to Maonan District Sewage Treatment Plant through tank trucks for treatment.
Dianbai District did not make up its mind and tried every means to solve the problem of insufficient processing capacity caused by frequent failures of urban water purification plants and irrespective of rain and pollution. Instead, it invested more than 30 million yuan in August this year to build and put into operation1 Set up a 10,000-ton/day integrated treatment facility for temporary disposal.
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