ADB today signed a $60 million loan deal (in Chinese Yuan equivalent) with Maxwealth Financial Leasing Co., Ltd. to improve municipal and industrial wastewater treatment capacity and standards in the People’s Republic of China...

ABSTRACT

The recent discovery of complete ammonia oxidizers (comammox) contradicts the paradigm that chemolithoautotrophic nitrification is always catalyzed by two different microorganisms. However, our knowledge of the survival strategies of comammox in complex ecosystems, such as full-scale wastewater treatment plants (WWTPs), remains limited. Analyses of genomes and in situ transcriptomes of four comammox organisms from two full-scale WWTPs revealed that comammox were active and showed a surprisingly high metabolic versatility. A gene cluster for the utilization of urea and a gene encoding cyanase suggest that comammox may use diverse organic nitrogen compounds in addition to free ammonia as the substrates. The comammox organisms also encoded the genomic potential for multiple alternative energy metabolisms, including respiration with hydrogen, formate, and sulfite as electron donors. Pathways for the biosynthesis and degradation of polyphosphate, glycogen, and polyhydroxyalkanoates as intracellular storage compounds likely help comammox survive unfavorable conditions and facilitate switches between lifestyles in fluctuating environments. One of the comammox strains acquired from the anaerobic tank encoded and transcribed genes involved in homoacetate fermentation or in the utilization of exogenous acetate, both pathways being unexpected in a nitrifying bacterium. Surprisingly, this strain also encoded a respiratory nitrate reductase which has not yet been found in any other Nitrospira genome and might confer a selective advantage to this strain over other Nitrospira strains in anoxic conditions.

IMPORTANCE The discovery of comammox in the genus Nitrospira changes our perception of nitrification. However, genomes of comammox organisms have not been acquired from full-scale WWTPs, and very little is known about their survival strategies and potential metabolisms in complex wastewater treatment systems. Here, four comammox metagenome-assembled genomes and metatranscriptomic data sets were retrieved from two full-scale WWTPs. Their impressive and—among nitrifiers—unsurpassed ecophysiological versatility could make comammox Nitrospira an interesting target for optimizing nitrification in current and future bioreactor configurations.

Christopher Neil Gauntt, the former supervisor of the Fort Gibson Water Treatment Plant in Fort Gibson, Okla., pleaded guilty today in U.S. District Court in Muskogee, Okla., to falsifying a monthly operating report that certified the safety of drinking water from the facility.

Herbert L. Corn, the former superintendent of the city of Rochester Wastewater Treatment Plant in Rochester, Ind., pleaded guilty today in U.S. District Court in South Bend, Ind., to falsifying monthly discharge monitoring reports that concealed violations of the Clean Water Act at the Rochester plant.

The former superintendent of a wastewater treatment facility in Rochester, Ind., was sentenced today in U.S. District Court in South Bend, Ind., to serve one year in prison for falsifying discharge monitoring reports that concealed violations of the Clean Water Act.

United Water Services Inc., the former contract operator of the Gary Sanitary District wastewater treatment works in Gary, Ind., and two of its employees, were charged today with conspiracy and felony violations of the Clean Water Act in a 26-count indictment returned by a federal grand jury.

The U.S. Department of Justice, U.S. Environmental Protection Agency (EPA) and the state of West Virginia announced today that Consol Energy Inc., the largest producer of coal from underground mines in the United States, has agreed to pay a $5.5 million civil penalty for Clean Water Act violations at six of its mines in West Virginia.

A Laurel Springs, N.J., wastewater treatment and chemical supply company and its owner were sentenced today for participating in a fraud conspiracy in connection with sub-contracts for wastewater treatment supplies and services at two Superfund sites in New Jersey.

Providing clean water in areas with minimal local resources may be as simple as implementing this ingenious DIY water treatment system.

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Wastewater Treatment Facility Colaba

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Chandrawal water treatment plant

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A new disinfection chemistry holds environmental and financial promise