China has expressed concern about the validity of the treatment of Japan's nuclear wastewater set to be released into the Pacific Ocean later this year, saying though Japan claims the water is safe after treatment, it still contains a lot of radioactive nuclides that are technically difficult to separate from water.

The equipment that will be used to discharge the nuclear wastewater was put into operation at the Fukushima Daiichi nuclear power plant on Friday.

Wang Wenbin, a spokesperson for the Chinese Foreign Ministry, on Tuesday said the nuclear wastewater contains more than 60 types of radionuclides, many of which can't be treated by current technology. There is also a risk that ocean currents may cause the radionuclides to spread, causing bioenrichment issues that could harm the marine environment and human health.

Wang also expressed doubt about the maturity and effectiveness of the Advanced Liquid Processing System (ALPS), a multi-nuclide removal system, saying data released by Japan in March showed that nearly 70 percent of nuclear wastewater treated by the ALPS was substandard. And the data comes from the Tokyo Electric Power Company, which has a habit of "falsifying and underreporting" data, Wang said.

He said more and more countries and international organizations have expressed their concern about releasing the Fukushima nuclear wastewater and that about 50 percent of Japanese people also oppose the release, with 90 percent believing that the release will have a negative impact. 

But the Japanese government, disregarding the international community's legitimate concerns, insists on releasing the wastewater, which not only violates its international obligations but will jeopardize the marine environment and public health and infringe on the interests of neighboring countries.

"It's by no means the act of a responsible country," Wang said.

He urged the Japanese government to halt the release of the wastewater until the relevant countries and international institutions can confirm the safety of the discharge plan.

"If the Japanese side insists on the release, the international community has the right to hold Japan accountable for transferring the risk of nuclear contamination to all mankind," Wang said.