全球水业动态: 波兰第一家Nereda好氧颗粒污泥项目工厂成功运行一周年

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    波兰第一家Nereda好氧颗粒污泥项目工厂成功运行一周年

    新加坡开始第四座海水淡化工厂的招标工作

    美国密歇根州水监管官员和水务公司主管因Flint市水污染事件受到刑事指控

    日本采用纤维载体技术提升污水处理效果

First Nereda installation in Poland reaches year milestone

波兰第一家Nereda好氧颗粒污泥项目工厂成功运行一周年

The first Nereda installation in Poland in the city of Ryki has celebrated a year in operation and has met all effluent requirements. This is the first installation located in the eastern part of Central Europe dealing with very low process temperatures in the order of 7–8 °C during the winter period.

The Ryki Nereda plant is designed to treat 5,320 m3/day (dry weather), corresponding to 38,600 PE. Beyond the temperature challenge, the plant combines the treatment of different incoming sewages (domestic, septic tanks and industrial) and has to handle extended industrial peak load periods.

Nereda is Royal HaskoningDHV’s patented full-scale municipal and industrial wastewater treatment technology that utilises aerobic granular sludge, developed through a collaborative public-private partnership involving Dutch wastewater treatment stakeholders, the Delft University of Technology (the Netherlands), various treatment plant end-users and Royal HaskoningDHV.

It was in 2012 DHV Hydroprojekt, a Polish company of RoyalHaskoningDHV group won the public tender for the complete design of the new Ryki Wastewater Treatment Plant for Przedsiebiorstwo Gospodarki Komunalnej i Mieszkaniowej (PGKiM), located in eastern Poland in the Province of Lublin.

The start-up of the plant was initiated in February 2015 and the Nereda reactors were both inoculated with conventional activated sludge, mainly transferred from the old works and a small portion from an external conventional WWTP.

At the time of the start-up the biomass concentration in the Nereda reactors was only 2g/L and therefore it was necessary to gradually increase the treatment capacity available in the new installation. Two months after the start-up was initiated the new Nereda installation was able to treat the total incoming sewage reaching the plant and the old SBR reactors were decommissioned.

Since start-up, the Ryki WWTP has been challenged by very low wastewater temperatures as compared with the intended minimum design temperature (12 °C). The biological process in the Nereda reactors was initiated in almost freezing conditions (approximately 4 °C) and only three months later (end of April) the design temperature was achieved.

The highest process temperature (23 °C) was reached in August 2015 (in summer), and since then a strong negative trend has been noted and less than 8 °C in the reactors was measured during most of January 2016.

Since April 2015 (two months after the initiation of the plant start-up) Ryki WWTP has been showing an excellent performance constantly meeting the effluent standard requirements, according to Royal HaskoningDHV. The plant operation is said to be positively responding to the peak industrial load (registered between September and December), as well as to extremely low wastewater temperatures (< 8 °C on average) noted in January and February 2016.

Forth desalination plant tender opens in Singapore

新加坡开始第四座海水淡化工厂的招标工作

Singapore utility PUB is adding to its desalination supply after calling for a tender to build a fourth project at Marina East. It was in September 2015 when the announcement was made for the country’s fourth desalination plant. To be delivered under a design-build-own-operate arrangement, the 136,000 m3/day plant will treat two different sources of water: seawater from the Singapore Straits or raw water from the Marina Reservoir. Black &Veatch was appointed earlier in the year to provide consultancy services on the development, having also worked on Hyflux’s Sing Spring project back in 2005.

Singapore currently has two desalination plants, meeting 25% of current water demand and has a third plant at Tuas is expected to be completed by 2017. By 2060, desalinated water is expected to provide up to 85% of Singapore’s water needs.

William Yeo, director of policy and planning at PUB, said:“ Increasing desalination capacity will further strengthen our water security and boost the drought resilience of Singapore’s water supply. Like NEWater, desalinated water is independent of rainwater and can be used to supplement our other water sources during dry weather.”

Criminal charges filed against three in Flint

美国密歇根州水监管官员和水务公司主管因Flint市水污染事件受到刑事指控

Michigan's attorney general announced that criminal charges will be brought against two state regulators and a Flint employee, alleging wrongdoing related to the city's lead-tainted water crisis.

© CNN

Michael Prysby, a district engineer with the state Department of Environmental Quality; Stephen Busch, a district supervisor in the same department; and Michael Glasgow, the city’s utilities manager, are charged with a mix of felony and misdameanor charges, including violating Michigan's drinking water law, official misconduct, destruction of utility property and evidence tampering.

The charges are the first levied in a probe that is expected to broaden in the coming weeks.  The charges were brought by the state attorney general, Bill Schuette, and authorized by Judge Tracy Collier-Nix of Genesee District Court. They were announced at a news conference in Flint on 20 April 2016.

For nearly 18 months after Flint's water source was switched while under state financial management, residents drank and bathed with improperly treated water that coursed through pipes, scraping away toxic lead. By the time Governor Rick Snyder announced in October 2015 that Flint would return to its earlier source of treated water, the Detroit municipal system, dangerously high levels of the toxic metal had been detected in the blood of some residents, including children, for whom it can cause lower IQs and behavioral problems.

Japanese fiber carrier trial aims to improve wastewater treatment

日本采用纤维载体技术提高污水处理效果

A Japanese consortium project using fiber carriers to reduce sludge in wastewater treatment has been adopted by the country’s Ministry of Land, Infrastructure, Transport and Tourism (MLIT).

Involving the Japan Sewage Works Agency, the technology is being field tested at the 2,500 m3/day Tatsuno Water Treatment Center, Nagano Prefecture. The agency will provide wastewater treatment services, engineering firm IHI Enviro will provide the wastewater treatment equipment and Teijin will be providing the special fiber carriers.

One of the existing reactors at the facility has been renovated to use the demonstration technology, with results to be compared against the conventional oxidation ditch (OD) process. It is hoped the adoption of the technology can make wastewater treatment easier by enabling operators to skip the step of controlling the activated sludge concentration and return sludge volume. Using a multi-staged reactor, fiber carriers are placed at a distance to prevent carriers from sticking together.

A shortage of engineers due to urban migration, aging populations and financial difficulties are causing problems for local municipalities when it comes to sewage management in Japan. In addition, high sewage treatment costs per unit for small plants put pressure on their finances. Waste sludge disposal costs and operation management commissions are higher for small municipalities than the national average.

The B-DASH Project was started by MLIT in 2011 to accelerate the research, development and commercialization of new technologies to substantially reduce sewage service costs, create renewable energy and support Japanese enterprises’ overseas water business expansion.

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