By Lucy Hornby

MUYU TOWN, China, May 24 (Reuters) - On a hillside above a collapsed middle school in Sichuan, biohazard workers in white suits scattered lime and sprayed disinfectant on hundreds of small, fresh graves, while two armed policemen stood watch.

Then a backhoe scooped up fresh dirt and completely covered the graves with their small triangles of cinderblock or stone, the white flowers and offerings, and the one wooden tablet that said "Feng Zhengyuan, Feng Zhengjun, Brothers", naming two brothers who died in the May 12 earthquake.

With tens of thousands of corpses littering the broken landscape, Sichuan is struggling to prevent disease from spreading into water sources and crowded tent camps.

The Sichuan government has named an official in charge of corpses, and tries to respect both the families and local traditions, said Sanrenmuguin, an official with the province's civil affairs bureau.

But crematoriums can't cope, he added.

In many towns where the numbers are too overwhelming, such as Yingxiu at the epicenter, the army has dug mass graves to bury the thousands of dead. In town after town, relatives keep vigil over the rubble for a last glimpse of the bodies.

"What can you do? There were too many," said Li Rong, in Xiang'e. Her cousin was one of the hundreds of students so mangled when the Xiang'e middle school collapsed that they were all buried together with their teachers in a 10-foot deep pit.

TABOO

Death pervades the ruined towns in the "disaster area," where somber people wait in neat tent towns.

Disinfection trucks drive along the streets, spraying chlorine over piles of rubble and the tarps on the sidewalks. Workers with backpacks move purposefully about, spraying disinfectant between tents and on the feet of passers-by.

A disinfection perimeter set up around the disaster area has gotten more elaborate every day. Mats in the roadway soaked with disinfectant have given way to a line of masked, suited workers who sprayed disinfectant up and down the sides of cars.

A second line of crouching workers armed with thick hoses shoots disinfectant at tyres. The stigma of death and disaster in the area clings to people.

"Don't worry, even though we are in the disaster area, our water is clean," one villager said, as his wife offered bowls of hot, orange liquid to visiting reporters.

Drivers ferrying reporters refused to eat or relieve themselves in the disaster area, and kept car windows shut when possible.

"I wouldn't eat that," said one driver named Wang, eyeing a cucumber offered by a volunteer at a refugee station.

"That's a disaster cucumber." (Editing by Bill Tarrant)

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